Fixed issue #3089: Show parent SHA1 on cherry picking a merge commit

[TortoiseGit.git] / src / TortoiseProc / StatGraphDlg.cpp

// TortoiseGit - a Windows shell extension for easy version control

// Copyright (C) 2008-2017 - TortoiseGit
// Copyright (C) 2003-2011, 2014-2016 - TortoiseSVN

// This program is free software; you can redistribute it and/or
// modify it under the terms of the GNU General Public License
// as published by the Free Software Foundation; either version 2
// of the License, or (at your option) any later version.

// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU General Public License for more details.

// You should have received a copy of the GNU General Public License
// along with this program; if not, write to the Free Software Foundation,
// 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
//
#include "stdafx.h"
#include "TortoiseProc.h"
#include "StatGraphDlg.h"
#include "AppUtils.h"
#include "PathUtils.h"
#include "registry.h"
#include "FormatMessageWrapper.h"
#include "SysProgressDlg.h"

#include <cmath>
#include <locale>
#include <utility>
#include <strsafe.h>

using namespace Gdiplus;

// BinaryPredicate for comparing authors based on their commit count
template<class DataType>
class MoreCommitsThan : public std::binary_function<tstring, tstring, bool> {
public:
        typedef std::map<tstring, DataType> MapType;
        MoreCommitsThan(MapType &author_commits) : m_authorCommits(author_commits) {}

        bool operator()(const tstring& lhs, const tstring& rhs) {
                return (m_authorCommits)[lhs] > (m_authorCommits)[rhs];
        }

private:
        MapType &m_authorCommits;
};


IMPLEMENT_DYNAMIC(CStatGraphDlg, CResizableStandAloneDialog)
CStatGraphDlg::CStatGraphDlg(CWnd* pParent /*=nullptr*/)
: CResizableStandAloneDialog(CStatGraphDlg::IDD, pParent)
, m_bStacked(FALSE)
, m_GraphType(MyGraph::Bar)
, m_bAuthorsCaseSensitive(TRUE)
, m_bSortByCommitCount(TRUE)
, m_bUseCommitterNames(FALSE)
, m_bUseCommitDates(TRUE)
, m_nWeeks(-1)
, m_nDays(-1)
, m_langOrder(0)
, m_firstInterval(0)
, m_lastInterval(0)
, m_nTotalCommits(0)
, m_nTotalLinesInc(0)
, m_nTotalLinesDec(0)
, m_nTotalLinesNew(0)
, m_nTotalLinesDel(0)
, m_bDiffFetched(FALSE)
, m_minDate(0)
, m_maxDate(0)
, m_nTotalFileChanges(0)
{
}

CStatGraphDlg::~CStatGraphDlg()
{
        ClearGraph();
}

void CStatGraphDlg::OnOK() {
        StoreCurrentGraphType();
        __super::OnOK();
}

void CStatGraphDlg::OnCancel() {
        StoreCurrentGraphType();
        __super::OnCancel();
}

void CStatGraphDlg::DoDataExchange(CDataExchange* pDX)
{
        CResizableStandAloneDialog::DoDataExchange(pDX);
        DDX_Control(pDX, IDC_GRAPH, m_graph);
        DDX_Control(pDX, IDC_GRAPHCOMBO, m_cGraphType);
        DDX_Control(pDX, IDC_SKIPPER, m_Skipper);
        DDX_Check(pDX, IDC_AUTHORSCASESENSITIVE, m_bAuthorsCaseSensitive);
        DDX_Check(pDX, IDC_SORTBYCOMMITCOUNT, m_bSortByCommitCount);
        DDX_Check(pDX, IDC_COMMITTERNAMES, m_bUseCommitterNames);
        DDX_Check(pDX, IDC_COMMITDATES, m_bUseCommitDates);
        DDX_Control(pDX, IDC_GRAPHBARBUTTON, m_btnGraphBar);
        DDX_Control(pDX, IDC_GRAPHBARSTACKEDBUTTON, m_btnGraphBarStacked);
        DDX_Control(pDX, IDC_GRAPHLINEBUTTON, m_btnGraphLine);
        DDX_Control(pDX, IDC_GRAPHLINESTACKEDBUTTON, m_btnGraphLineStacked);
        DDX_Control(pDX, IDC_GRAPHPIEBUTTON, m_btnGraphPie);
}


BEGIN_MESSAGE_MAP(CStatGraphDlg, CResizableStandAloneDialog)
        ON_CBN_SELCHANGE(IDC_GRAPHCOMBO, OnCbnSelchangeGraphcombo)
        ON_WM_HSCROLL()
        ON_NOTIFY(TTN_NEEDTEXT, nullptr, OnNeedText)
        ON_BN_CLICKED(IDC_AUTHORSCASESENSITIVE, &CStatGraphDlg::AuthorsCaseSensitiveChanged)
        ON_BN_CLICKED(IDC_SORTBYCOMMITCOUNT, &CStatGraphDlg::SortModeChanged)
        ON_BN_CLICKED(IDC_GRAPHBARBUTTON, &CStatGraphDlg::OnBnClickedGraphbarbutton)
        ON_BN_CLICKED(IDC_GRAPHBARSTACKEDBUTTON, &CStatGraphDlg::OnBnClickedGraphbarstackedbutton)
        ON_BN_CLICKED(IDC_GRAPHLINEBUTTON, &CStatGraphDlg::OnBnClickedGraphlinebutton)
        ON_BN_CLICKED(IDC_GRAPHLINESTACKEDBUTTON, &CStatGraphDlg::OnBnClickedGraphlinestackedbutton)
        ON_BN_CLICKED(IDC_GRAPHPIEBUTTON, &CStatGraphDlg::OnBnClickedGraphpiebutton)
        ON_COMMAND(ID_FILE_SAVESTATGRAPHAS, &CStatGraphDlg::OnFileSavestatgraphas)
        ON_BN_CLICKED(IDC_CALC_DIFF, &CStatGraphDlg::OnBnClickedFetchDiff)
        ON_BN_CLICKED(IDC_COMMITTERNAMES, &CStatGraphDlg::OnBnClickedCommitternames)
        ON_BN_CLICKED(IDC_COMMITDATES, &CStatGraphDlg::OnBnClickedCommitdates)
END_MESSAGE_MAP()

void CStatGraphDlg::LoadStatQueries (__in UINT curStr, Metrics loadMetric, bool setDef /* = false */)
{
        CString temp;
        temp.LoadString(curStr);
        int sel = m_cGraphType.AddString(temp);
        m_cGraphType.SetItemData(sel, loadMetric);

        if (setDef) m_cGraphType.SetCurSel(sel);
}

void CStatGraphDlg::SetSkipper (bool reloadSkiper)
{
        // We need to limit the number of authors due to GUI resource limitation.
        // However, since author #251 will properly have < 1000th of the commits,
        // the resolution limit of the screen will already not allow for displaying
        // it in a reasonable way

        int max_authors_count = max(1, (int)min(m_authorNames.size(), 250) );
        m_Skipper.SetRange (1, max_authors_count);
        m_Skipper.SetPageSize(5);

        if (reloadSkiper)
                m_Skipper.SetPos (max_authors_count);
}

BOOL CStatGraphDlg::OnInitDialog()
{
        CResizableStandAloneDialog::OnInitDialog();

        m_tooltips.AddTool(&m_btnGraphPie, IDS_STATGRAPH_PIEBUTTON_TT);
        m_tooltips.AddTool(&m_btnGraphLineStacked, IDS_STATGRAPH_LINESTACKEDBUTTON_TT);
        m_tooltips.AddTool(&m_btnGraphLine, IDS_STATGRAPH_LINEBUTTON_TT);
        m_tooltips.AddTool(&m_btnGraphBarStacked, IDS_STATGRAPH_BARSTACKEDBUTTON_TT);
        m_tooltips.AddTool(&m_btnGraphBar, IDS_STATGRAPH_BARBUTTON_TT);
        m_tooltips.Activate(TRUE);

        m_bAuthorsCaseSensitive = DWORD(CRegDWORD(L"Software\\TortoiseGit\\StatAuthorsCaseSensitive", m_bAuthorsCaseSensitive));
        m_bSortByCommitCount = DWORD(CRegDWORD(L"Software\\TortoiseGit\\StatSortByCommitCount", m_bSortByCommitCount));
        m_bUseCommitterNames = DWORD(CRegDWORD(L"Software\\TortoiseGit\\StatCommiterNames", m_bUseCommitterNames));
        m_bUseCommitDates = DWORD(CRegDWORD(L"Software\\TortoiseGit\\StatCommitDates", m_bUseCommitDates));
        UpdateData(FALSE);

        // gather statistics data, only needs to be updated when the checkbox with
        // the case sensitivity of author names is changed
        GatherData();

        //Load statistical queries
        LoadStatQueries(IDS_STATGRAPH_STATS, AllStat, true);
        LoadStatQueries(IDS_STATGRAPH_COMMITSBYDATE, CommitsByDate);
        LoadStatQueries(IDS_STATGRAPH_COMMITSBYAUTHOR, CommitsByAuthor);
        LoadStatQueries(IDS_STATGRAPH_PERCENTAGE_OF_AUTHORSHIP, PercentageOfAuthorship);
        LoadStatQueries(IDS_STATGRAPH_LINES_BYDATE_W, LinesWByDate);
        LoadStatQueries(IDS_STATGRAPH_LINES_BYDATE_WO, LinesWOByDate);

        // set the dialog title to "Statistics - path/to/whatever/we/show/the/statistics/for"
        CString sTitle;
        GetWindowText(sTitle);
        if (m_path.IsEmpty())
                CAppUtils::SetWindowTitle(m_hWnd, g_Git.m_CurrentDir, sTitle);
        else
                CAppUtils::SetWindowTitle(m_hWnd, m_path.GetUIPathString(), sTitle);

        int iconWidth = GetSystemMetrics(SM_CXSMICON);
        int iconHeight = GetSystemMetrics(SM_CYSMICON);
        m_btnGraphBar.SetImage((HICON)LoadImage(AfxGetResourceHandle(), MAKEINTRESOURCE(IDI_GRAPHBAR), IMAGE_ICON, iconWidth, iconHeight, LR_DEFAULTCOLOR));
        m_btnGraphBar.SizeToContent();
        m_btnGraphBar.Invalidate();
        m_btnGraphBarStacked.SetImage((HICON)LoadImage(AfxGetResourceHandle(), MAKEINTRESOURCE(IDI_GRAPHBARSTACKED), IMAGE_ICON, iconWidth, iconHeight, LR_DEFAULTCOLOR));
        m_btnGraphBarStacked.SizeToContent();
        m_btnGraphBarStacked.Invalidate();
        m_btnGraphLine.SetImage((HICON)LoadImage(AfxGetResourceHandle(), MAKEINTRESOURCE(IDI_GRAPHLINE), IMAGE_ICON, iconWidth, iconHeight, LR_DEFAULTCOLOR));
        m_btnGraphLine.SizeToContent();
        m_btnGraphLine.Invalidate();
        m_btnGraphLineStacked.SetImage((HICON)LoadImage(AfxGetResourceHandle(), MAKEINTRESOURCE(IDI_GRAPHLINESTACKED), IMAGE_ICON, iconWidth, iconHeight, LR_DEFAULTCOLOR));
        m_btnGraphLineStacked.SizeToContent();
        m_btnGraphLineStacked.Invalidate();
        m_btnGraphPie.SetImage((HICON)LoadImage(AfxGetResourceHandle(), MAKEINTRESOURCE(IDI_GRAPHPIE), IMAGE_ICON, iconWidth, iconHeight, LR_DEFAULTCOLOR));
        m_btnGraphPie.SizeToContent();
        m_btnGraphPie.Invalidate();

        AdjustControlSize(IDC_AUTHORSCASESENSITIVE);
        AdjustControlSize(IDC_SORTBYCOMMITCOUNT);
        AdjustControlSize(IDC_COMMITTERNAMES);
        AdjustControlSize(IDC_COMMITDATES);

        AddAnchor(IDC_GRAPHTYPELABEL, TOP_LEFT);
        AddAnchor(IDC_GRAPH, TOP_LEFT, BOTTOM_RIGHT);
        AddAnchor(IDC_GRAPHCOMBO, TOP_LEFT, TOP_RIGHT);

        AddAnchor(IDC_NUMWEEK, TOP_LEFT);
        AddAnchor(IDC_NUMWEEKVALUE, TOP_RIGHT);
        AddAnchor(IDC_NUMAUTHOR, TOP_LEFT);
        AddAnchor(IDC_NUMAUTHORVALUE, TOP_RIGHT);
        AddAnchor(IDC_NUMCOMMITS, TOP_LEFT);
        AddAnchor(IDC_NUMCOMMITSVALUE, TOP_RIGHT);
        AddAnchor(IDC_NUMFILECHANGES, TOP_LEFT);
        AddAnchor(IDC_NUMFILECHANGESVALUE, TOP_RIGHT);

        AddAnchor(IDC_TOTAL_LINE_WITHOUT_NEW_DEL, TOP_LEFT);
        AddAnchor(IDC_TOTAL_LINE_WITHOUT_NEW_DEL_VALUE, TOP_RIGHT);
        AddAnchor(IDC_TOTAL_LINE_WITH_NEW_DEL, TOP_LEFT);
        AddAnchor(IDC_TOTAL_LINE_WITH_NEW_DEL_VALUE, TOP_RIGHT);

        AddAnchor(IDC_CALC_DIFF, TOP_RIGHT);

        AddAnchor(IDC_AVG, TOP_RIGHT);
        AddAnchor(IDC_MIN, TOP_RIGHT);
        AddAnchor(IDC_MAX, TOP_RIGHT);
        AddAnchor(IDC_COMMITSEACHWEEK, TOP_LEFT);
        AddAnchor(IDC_MOSTACTIVEAUTHOR, TOP_LEFT);
        AddAnchor(IDC_LEASTACTIVEAUTHOR, TOP_LEFT);
        AddAnchor(IDC_MOSTACTIVEAUTHORNAME, TOP_LEFT, TOP_RIGHT);
        AddAnchor(IDC_LEASTACTIVEAUTHORNAME, TOP_LEFT, TOP_RIGHT);
        AddAnchor(IDC_FILECHANGESEACHWEEK, TOP_LEFT);
        AddAnchor(IDC_COMMITSEACHWEEKAVG, TOP_RIGHT);
        AddAnchor(IDC_COMMITSEACHWEEKMIN, TOP_RIGHT);
        AddAnchor(IDC_COMMITSEACHWEEKMAX, TOP_RIGHT);
        AddAnchor(IDC_MOSTACTIVEAUTHORAVG, TOP_RIGHT);
        AddAnchor(IDC_MOSTACTIVEAUTHORMIN, TOP_RIGHT);
        AddAnchor(IDC_MOSTACTIVEAUTHORMAX, TOP_RIGHT);
        AddAnchor(IDC_LEASTACTIVEAUTHORAVG, TOP_RIGHT);
        AddAnchor(IDC_LEASTACTIVEAUTHORMIN, TOP_RIGHT);
        AddAnchor(IDC_LEASTACTIVEAUTHORMAX, TOP_RIGHT);
        AddAnchor(IDC_FILECHANGESEACHWEEKAVG, TOP_RIGHT);
        AddAnchor(IDC_FILECHANGESEACHWEEKMIN, TOP_RIGHT);
        AddAnchor(IDC_FILECHANGESEACHWEEKMAX, TOP_RIGHT);

        AddAnchor(IDC_GRAPHBARBUTTON, BOTTOM_RIGHT);
        AddAnchor(IDC_GRAPHBARSTACKEDBUTTON, BOTTOM_RIGHT);
        AddAnchor(IDC_GRAPHLINEBUTTON, BOTTOM_RIGHT);
        AddAnchor(IDC_GRAPHLINESTACKEDBUTTON, BOTTOM_RIGHT);
        AddAnchor(IDC_GRAPHPIEBUTTON, BOTTOM_RIGHT);

        AddAnchor(IDC_AUTHORSCASESENSITIVE, BOTTOM_LEFT);
        AddAnchor(IDC_SORTBYCOMMITCOUNT, BOTTOM_LEFT);
        AddAnchor(IDC_COMMITTERNAMES, BOTTOM_LEFT);
        AddAnchor(IDC_COMMITDATES, BOTTOM_LEFT);
        AddAnchor(IDC_SKIPPER, BOTTOM_LEFT, BOTTOM_RIGHT);
        AddAnchor(IDC_SKIPPERLABEL, BOTTOM_LEFT);
        AddAnchor(IDOK, BOTTOM_RIGHT);
        EnableSaveRestore(L"StatGraphDlg");

        // set the min/max values on the skipper
        SetSkipper (true);

        // we use a stats page encoding here, 0 stands for the statistics dialog
        CRegDWORD lastStatsPage(L"Software\\TortoiseGit\\LastViewedStatsPage", 0);

        // open last viewed statistics page as first page
        int graphtype = lastStatsPage / 10;
        for (int i = 0; i < m_cGraphType.GetCount(); i++)
        {
                if ((int)m_cGraphType.GetItemData(i) == graphtype)
                {
                        m_cGraphType.SetCurSel(i);
                        break;
                }
        }

        OnCbnSelchangeGraphcombo();

        int statspage = lastStatsPage % 10;
        switch (statspage) {
                case 1 :
                        m_GraphType = MyGraph::Bar;
                        m_bStacked = true;
                        break;
                case 2 :
                        m_GraphType = MyGraph::Bar;
                        m_bStacked = false;
                        break;
                case 3 :
                        m_GraphType = MyGraph::Line;
                        m_bStacked = true;
                        break;
                case 4 :
                        m_GraphType = MyGraph::Line;
                        m_bStacked = false;
                        break;
                case 5 :
                        m_GraphType = MyGraph::PieChart;
                        break;

                default : return TRUE;
        }

        LCID m_locale = MAKELCID((DWORD)CRegStdDWORD(L"Software\\TortoiseGit\\LanguageID", MAKELANGID(LANG_NEUTRAL, SUBLANG_DEFAULT)), SORT_DEFAULT);

        bool bUseSystemLocale = !!(DWORD)CRegStdDWORD(L"Software\\TortoiseGit\\UseSystemLocaleForDates", TRUE);
        LCID locale = bUseSystemLocale ? MAKELCID(MAKELANGID(LANG_NEUTRAL, SUBLANG_DEFAULT), SORT_DEFAULT) : m_locale;

        TCHAR langBuf[11] = { 0 };
        GetLocaleInfo(locale, LOCALE_IDATE, langBuf, _countof(langBuf));

        m_langOrder = _wtoi(langBuf);

        return TRUE;
}

void CStatGraphDlg::ShowLabels(BOOL bShow)
{
        if (m_parAuthors.IsEmpty() || m_parDates.IsEmpty() || m_parFileChanges.IsEmpty())
                return;

        int nCmdShow = bShow ? SW_SHOW : SW_HIDE;

        GetDlgItem(IDC_GRAPH)->ShowWindow(bShow ? SW_HIDE : SW_SHOW);
        GetDlgItem(IDC_NUMWEEK)->ShowWindow(nCmdShow);
        GetDlgItem(IDC_NUMWEEKVALUE)->ShowWindow(nCmdShow);
        GetDlgItem(IDC_NUMAUTHOR)->ShowWindow(nCmdShow);
        GetDlgItem(IDC_NUMAUTHORVALUE)->ShowWindow(nCmdShow);
        GetDlgItem(IDC_NUMCOMMITS)->ShowWindow(nCmdShow);
        GetDlgItem(IDC_NUMCOMMITSVALUE)->ShowWindow(nCmdShow);
        GetDlgItem(IDC_NUMFILECHANGES)->ShowWindow(nCmdShow);
        GetDlgItem(IDC_NUMFILECHANGESVALUE)->ShowWindow(nCmdShow);
        GetDlgItem(IDC_TOTAL_LINE_WITHOUT_NEW_DEL)->ShowWindow(nCmdShow);
        GetDlgItem(IDC_TOTAL_LINE_WITHOUT_NEW_DEL_VALUE)->ShowWindow(nCmdShow);
        GetDlgItem(IDC_TOTAL_LINE_WITH_NEW_DEL)->ShowWindow(nCmdShow);
        GetDlgItem(IDC_TOTAL_LINE_WITH_NEW_DEL_VALUE)->ShowWindow(nCmdShow);
        GetDlgItem(IDC_CALC_DIFF)->ShowWindow(nCmdShow && !m_bDiffFetched);

        GetDlgItem(IDC_AVG)->ShowWindow(nCmdShow);
        GetDlgItem(IDC_MIN)->ShowWindow(nCmdShow);
        GetDlgItem(IDC_MAX)->ShowWindow(nCmdShow);
        GetDlgItem(IDC_COMMITSEACHWEEK)->ShowWindow(nCmdShow);
        GetDlgItem(IDC_MOSTACTIVEAUTHOR)->ShowWindow(nCmdShow);
        GetDlgItem(IDC_LEASTACTIVEAUTHOR)->ShowWindow(nCmdShow);
        GetDlgItem(IDC_MOSTACTIVEAUTHORNAME)->ShowWindow(nCmdShow);
        GetDlgItem(IDC_LEASTACTIVEAUTHORNAME)->ShowWindow(nCmdShow);
        //GetDlgItem(IDC_FILECHANGESEACHWEEK)->ShowWindow(nCmdShow);
        GetDlgItem(IDC_COMMITSEACHWEEKAVG)->ShowWindow(nCmdShow);
        GetDlgItem(IDC_COMMITSEACHWEEKMIN)->ShowWindow(nCmdShow);
        GetDlgItem(IDC_COMMITSEACHWEEKMAX)->ShowWindow(nCmdShow);
        GetDlgItem(IDC_MOSTACTIVEAUTHORAVG)->ShowWindow(nCmdShow);
        GetDlgItem(IDC_MOSTACTIVEAUTHORMIN)->ShowWindow(nCmdShow);
        GetDlgItem(IDC_MOSTACTIVEAUTHORMAX)->ShowWindow(nCmdShow);
        GetDlgItem(IDC_LEASTACTIVEAUTHORAVG)->ShowWindow(nCmdShow);
        GetDlgItem(IDC_LEASTACTIVEAUTHORMIN)->ShowWindow(nCmdShow);
        GetDlgItem(IDC_LEASTACTIVEAUTHORMAX)->ShowWindow(nCmdShow);
        GetDlgItem(IDC_FILECHANGESEACHWEEKAVG)->ShowWindow(nCmdShow);
        GetDlgItem(IDC_FILECHANGESEACHWEEKMIN)->ShowWindow(nCmdShow);
        GetDlgItem(IDC_FILECHANGESEACHWEEKMAX)->ShowWindow(nCmdShow);

        GetDlgItem(IDC_SORTBYCOMMITCOUNT)->ShowWindow(bShow ? SW_HIDE : SW_SHOW);
        GetDlgItem(IDC_SKIPPER)->ShowWindow(bShow ? SW_HIDE : SW_SHOW);
        GetDlgItem(IDC_SKIPPERLABEL)->ShowWindow(bShow ? SW_HIDE : SW_SHOW);
        m_btnGraphBar.ShowWindow(bShow ? SW_HIDE : SW_SHOW);
        m_btnGraphBarStacked.ShowWindow(bShow ? SW_HIDE : SW_SHOW);
        m_btnGraphLine.ShowWindow(bShow ? SW_HIDE : SW_SHOW);
        m_btnGraphLineStacked.ShowWindow(bShow ? SW_HIDE : SW_SHOW);
        m_btnGraphPie.ShowWindow(bShow ? SW_HIDE : SW_SHOW);
}

void CStatGraphDlg::UpdateWeekCount()
{
        // Sanity check
        if (m_parDates.IsEmpty())
                return;

        // Already updated? No need to do it again.
        if (m_nWeeks >= 0)
                return;

        // Determine first and last date in dates array
        __time64_t min_date = (__time64_t)m_parDates.GetAt(0);
        __time64_t max_date = min_date;
        INT_PTR count = m_parDates.GetCount();
        for (INT_PTR i=0; i<count; ++i)
        {
                __time64_t d = (__time64_t)m_parDates.GetAt(i);
                if (d < min_date)               min_date = d;
                else if (d > max_date)  max_date = d;
        }

        // Store start date of the interval in the member variable m_minDate
        m_minDate = min_date;
        m_maxDate = max_date;

        // How many weeks does the time period cover?

        // Get time difference between start and end date
        double secs = _difftime64(max_date, m_minDate);

        m_nWeeks =      (int)ceil(secs / (double) m_SecondsInWeek);
        m_nDays =       (int)ceil(secs / (double) m_SecondsInDay);
}

int CStatGraphDlg::GetCalendarWeek(const CTime& time)
{
        // Note:
        // the calculation of the calendar week is wrong if DST is in effect
        // and the date to calculate the week for is in DST and within the range
        // of the DST offset (e.g. one hour).
        // For example, if DST starts on Sunday march 30 and the date to get the week for
        // is Monday, march 31, 0:30:00, then the returned week is one week less than
        // the real week.
        // TODO: ?
        // write a function
        // getDSTOffset(const CTime& time)
        // which returns the DST offset for a given time/date. Then we can use this offset
        // to correct our GetDays() calculation to get the correct week again
        // This of course won't work for 'history' dates, because Windows doesn't have
        // that information (only Vista has such a function: GetTimeZoneInformationForYear() )
        int iWeekOfYear = 0;

        int iYear = time.GetYear();
        int iFirstDayOfWeek = 0;
        int iFirstWeekOfYear = 0;
        TCHAR loc[2] = { 0 };
        GetLocaleInfo(LOCALE_USER_DEFAULT, LOCALE_IFIRSTDAYOFWEEK, loc, _countof(loc));
        iFirstDayOfWeek = int(loc[0]-'0');
        GetLocaleInfo(LOCALE_USER_DEFAULT, LOCALE_IFIRSTWEEKOFYEAR, loc, _countof(loc));
        iFirstWeekOfYear = int(loc[0]-'0');
        CTime dDateFirstJanuary(iYear,1,1,0,0,0);
        int iDayOfWeek = (dDateFirstJanuary.GetDayOfWeek()+5+iFirstDayOfWeek)%7;

        // Select mode
        // 0 Week containing 1/1 is the first week of that year.
        // 1 First full week following 1/1 is the first week of that year.
        // 2 First week containing at least four days is the first week of that year.
        switch (iFirstWeekOfYear)
        {
                case 0:
                        {
                                // Week containing 1/1 is the first week of that year.

                                // check if this week reaches into the next year
                                dDateFirstJanuary = CTime(iYear+1,1,1,0,0,0);

                                // Get start of week
                                try
                                {
                                        iDayOfWeek = (time.GetDayOfWeek()+5+iFirstDayOfWeek)%7;
                                }
                                catch (CAtlException)
                                {
                                }
                                CTime dStartOfWeek = time-CTimeSpan(iDayOfWeek,0,0,0);

                                // If this week spans over to 1/1 this is week 1
                                if (dStartOfWeek + CTimeSpan(6,0,0,0) >= dDateFirstJanuary)
                                {
                                        // we are in the last week of the year that spans over 1/1
                                        iWeekOfYear = 1;
                                }
                                else
                                {
                                        // Get week day of 1/1
                                        dDateFirstJanuary = CTime(iYear,1,1,0,0,0);
                                        iDayOfWeek = (dDateFirstJanuary.GetDayOfWeek() +5 + iFirstDayOfWeek) % 7;
                                        // Just count from 1/1
                                        iWeekOfYear = (int)(((time-dDateFirstJanuary).GetDays() + iDayOfWeek) / 7) + 1;
                                }
                        }
                        break;
                case 1:
                        {
                                // First full week following 1/1 is the first week of that year.

                                // If the 1.1 is the start of the week everything is ok
                                // else we need the next week is the correct result
                                iWeekOfYear =
                                        (int)(((time-dDateFirstJanuary).GetDays() + iDayOfWeek) / 7) +
                                        (iDayOfWeek==0 ? 1:0);

                                // If we are in week 0 we are in the first not full week
                                // calculate from the last year
                                if (iWeekOfYear==0)
                                {
                                        // Special case: we are in the week of 1.1 but 1.1. is not on the
                                        // start of week. Calculate based on the last year
                                        dDateFirstJanuary = CTime(iYear-1,1,1,0,0,0);
                                        iDayOfWeek =
                                                (dDateFirstJanuary.GetDayOfWeek()+5+iFirstDayOfWeek)%7;
                                        // and we correct this in the same we we done this before but
                                        // the result is now 52 or 53 and not 0
                                        iWeekOfYear =
                                                (int)(((time-dDateFirstJanuary).GetDays()+iDayOfWeek) / 7) +
                                                (iDayOfWeek<=3 ? 1:0);
                                }
                        }
                        break;
                case 2:
                        {
                                // First week containing at least four days is the first week of that year.

                                // Each year can start with any day of the week. But our
                                // weeks always start with Monday. So we add the day of week
                                // before calculation of the final week of year.
                                // Rule: is the 1.1 a Mo,Tu,We,Th than the week starts on the 1.1 with
                                // week==1, else a week later, so we add one for all those days if
                                // day is less <=3 Mo,Tu,We,Th. Otherwise 1.1 is in the last week of the
                                // previous year
                                iWeekOfYear =
                                        (int)(((time-dDateFirstJanuary).GetDays()+iDayOfWeek) / 7) +
                                        (iDayOfWeek<=3 ? 1:0);

                                // special cases
                                if (iWeekOfYear==0)
                                {
                                        // special case week 0. We got a day before the 1.1, 2.1 or 3.1, were the
                                        // 1.1. is not a Mo, Tu, We, Th. So the week 1 does not start with the 1.1.
                                        // So we calculate the week according to the 1.1 of the year before

                                        dDateFirstJanuary = CTime(iYear-1,1,1,0,0,0);
                                        iDayOfWeek =
                                                (dDateFirstJanuary.GetDayOfWeek()+5+iFirstDayOfWeek)%7;
                                        // and we correct this in the same we we done this before but the result
                                        // is now 52 or 53 and not 0
                                        iWeekOfYear =
                                                (int)(((time-dDateFirstJanuary).GetDays()+iDayOfWeek) / 7) +
                                                (iDayOfWeek<=3 ? 1:0);
                                }
                                else if (iWeekOfYear==53)
                                {
                                        // special case week 53. Either we got the correct week 53 or we just got the
                                        // week 1 of the next year. So is the 1.1.(year+1) also a Mo, Tu, We, Th than
                                        // we already have the week 1, otherwise week 53 is correct

                                        dDateFirstJanuary = CTime(iYear+1,1,1,0,0,0);
                                        iDayOfWeek =
                                                (dDateFirstJanuary.GetDayOfWeek()+5+iFirstDayOfWeek)%7;
                                        // 1.1. in week 1 or week 53?
                                        iWeekOfYear = iDayOfWeek<=3 ? 1:53;
                                }
                        }
                        break;
                default:
                        ASSERT(FALSE);
                        break;
        }
        // return result
        return iWeekOfYear;
}

int CStatGraphDlg::GatherData(BOOL fetchdiff, BOOL keepFetchedData)
{
        m_parAuthors.RemoveAll();
        m_parDates.RemoveAll();
        if (m_parFileChanges2.IsEmpty()) // Fixes issue #1948
                keepFetchedData = FALSE;
        if (!keepFetchedData)
        {
                m_parFileChanges.RemoveAll();
                m_lineInc.RemoveAll();
                m_lineDec.RemoveAll();
                m_lineDel.RemoveAll();
                m_lineNew.RemoveAll();
        }
        else
        {
                m_parFileChanges.Copy(m_parFileChanges2);
                m_lineNew.Copy(m_lineNew2);
                m_lineDel.Copy(m_lineDel2);
                m_lineInc.Copy(m_lineInc2);
                m_lineDec.Copy(m_lineDec2);
        }

        CSysProgressDlg progress;
        if (fetchdiff)
        {
                progress.SetTitle(CString(MAKEINTRESOURCE(IDS_PROGS_TITLE_GATHERSTATISTICS)));
                progress.FormatNonPathLine(1, IDS_PROC_STATISTICS_DIFF);
                progress.SetTime(true);
                progress.ShowModeless(this);
        }

        // create arrays which are aware of the current filter
        ULONGLONG starttime = GetTickCount64();

        if (m_bUseCommitDates)
                std::sort(m_ShowList.begin(), m_ShowList.end(), [](GitRevLoglist* pLhs, GitRevLoglist* pRhs) { return pLhs->GetCommitterDate() > pRhs->GetCommitterDate(); });
        else
                std::sort(m_ShowList.begin(), m_ShowList.end(), [](GitRevLoglist* pLhs, GitRevLoglist* pRhs) { return pLhs->GetAuthorDate() > pRhs->GetAuthorDate(); });

        GIT_MAILMAP mailmap = nullptr;
        git_read_mailmap(&mailmap);
        for (size_t i = 0; i < m_ShowList.size(); ++i)
        {
                auto pLogEntry = m_ShowList[i];
                int inc, dec, incnewfile, decdeletedfile, files;
                inc = dec = incnewfile = decdeletedfile = files= 0;

                CString strAuthor = m_bUseCommitterNames ? pLogEntry->GetCommitterName() : pLogEntry->GetAuthorName();
                if (mailmap)
                {
                        CStringA email2A = CUnicodeUtils::GetUTF8(m_bUseCommitterNames ? pLogEntry->GetCommitterEmail() : pLogEntry->GetAuthorEmail());
                        struct payload_struct { GitRev* rev; const char *authorName; BOOL useCommitterNames; };
                        payload_struct payload = { pLogEntry, nullptr, m_bUseCommitterNames };
                        const char* author1 = nullptr;
                        git_lookup_mailmap(mailmap, nullptr, &author1, email2A, &payload, 
                                [](void* payload) -> const char* { return reinterpret_cast<payload_struct*>(payload)->authorName = _strdup(CUnicodeUtils::GetUTF8(reinterpret_cast<payload_struct*>(payload)->useCommitterNames ? reinterpret_cast<payload_struct*>(payload)->rev->GetCommitterName() : reinterpret_cast<payload_struct*>(payload)->rev->GetAuthorName())); });
                        free((void *)payload.authorName);
                        if (author1)
                                strAuthor = CUnicodeUtils::GetUnicode(author1);
                }
                if (strAuthor.IsEmpty())
                        strAuthor.LoadString(IDS_STATGRAPH_EMPTYAUTHOR);
                m_parAuthors.Add(strAuthor);
                if (m_bUseCommitDates)
                        m_parDates.Add((DWORD)pLogEntry->GetCommitterDate().GetTime());
                else
                        m_parDates.Add((DWORD)pLogEntry->GetAuthorDate().GetTime());

                if (fetchdiff && (pLogEntry->m_ParentHash.size() <= 1))
                {
                        CTGitPathList& list = pLogEntry->GetFiles(nullptr);
                        files = list.GetCount();

                        for (int j = 0; j < files; j++)
                        {
                                if (list[j].m_Action & CTGitPath::LOGACTIONS_DELETED)
                                        decdeletedfile += _wtol(list[j].m_StatDel);
                                else if(list[j].m_Action & CTGitPath::LOGACTIONS_ADDED)
                                        incnewfile += _wtol(list[j].m_StatAdd);
                                else
                                {
                                        inc += _wtol(list[j].m_StatAdd);
                                        dec += _wtol(list[j].m_StatDel);
                                }

                                if (progress.HasUserCancelled())
                                {
                                        git_free_mailmap(mailmap);
                                        return -1;
                                }
                        }
                }
                if (!keepFetchedData)
                {
                        m_parFileChanges.Add(files);
                        m_lineInc.Add(inc);
                        m_lineDec.Add(dec);
                        m_lineDel.Add(decdeletedfile);
                        m_lineNew.Add(incnewfile);
                }

                if (progress.IsVisible() && (GetTickCount64() - starttime > 100UL))
                {
                        progress.FormatNonPathLine(2, L"%s: %s", (LPCTSTR)pLogEntry->m_CommitHash.ToString().Left(g_Git.GetShortHASHLength()), (LPCTSTR)pLogEntry->GetSubject());
                        progress.SetProgress64(i, m_ShowList.size());
                        starttime = GetTickCount64();
                }
                
        }
        git_free_mailmap(mailmap);

        if (fetchdiff)
        {
                m_parFileChanges2.Copy(m_parFileChanges);
                m_lineNew2.Copy(m_lineNew);
                m_lineDel2.Copy(m_lineDel);
                m_lineInc2.Copy(m_lineInc);
                m_lineDec2.Copy(m_lineDec);
        }

        m_nTotalCommits = m_parAuthors.GetCount();
        m_nTotalFileChanges = 0;

        // Update m_nWeeks and m_minDate
        UpdateWeekCount();

        // Now create a mapping that holds the information per week.
        m_commitsPerUnitAndAuthor.clear();
        m_filechangesPerUnitAndAuthor.clear();
        m_commitsPerAuthor.clear();
        m_PercentageOfAuthorship.clear();
        m_LinesWPerUnitAndAuthor.clear();
        m_LinesWOPerUnitAndAuthor.clear();

        int interval = 0;
        __time64_t d = (__time64_t)m_parDates.GetAt(0);
        int nLastUnit = GetUnit(d);
        double AllContributionAuthor = 0;

        m_nTotalLinesInc = m_nTotalLinesDec = m_nTotalLinesNew = m_nTotalLinesDel =0;

        // Now loop over all weeks and gather the info
        for (LONG i=0; i<m_nTotalCommits; ++i)
        {
                // Find the interval number
                __time64_t commitDate = (__time64_t)m_parDates.GetAt(i);
                int u = GetUnit(commitDate);
                if (nLastUnit != u)
                        interval++;
                nLastUnit = u;
                // Find the authors name
                CString sAuth = m_parAuthors.GetAt(i);
                if (!m_bAuthorsCaseSensitive)
                        sAuth = sAuth.MakeLower();
                tstring author = tstring(sAuth);
                // Increase total commit count for this author
                m_commitsPerAuthor[author]++;
                // Increase the commit count for this author in this week
                m_commitsPerUnitAndAuthor[interval][author]++;

                m_LinesWPerUnitAndAuthor[interval][author] += m_lineInc.GetAt(i) + m_lineDec.GetAt(i) + m_lineNew.GetAt(i) + + m_lineDel.GetAt(i);
                m_LinesWOPerUnitAndAuthor[interval][author] += m_lineInc.GetAt(i) + m_lineDec.GetAt(i);

                CTime t = m_parDates.GetAt(i);
                m_unitNames[interval] = GetUnitLabel(nLastUnit, t);
                // Increase the file change count for this author in this week
                int fileChanges = m_parFileChanges.GetAt(i);
                m_filechangesPerUnitAndAuthor[interval][author] += fileChanges;
                m_nTotalFileChanges += fileChanges;

                //calculate Contribution Author
                double contributionAuthor = CoeffContribution((int)m_nTotalCommits - i -1) * (fileChanges ? fileChanges : 1);
                AllContributionAuthor += contributionAuthor;
                m_PercentageOfAuthorship[author] += contributionAuthor;

                m_nTotalLinesInc += m_lineInc.GetAt(i);
                m_nTotalLinesDec += m_lineDec.GetAt(i);
                m_nTotalLinesNew += m_lineNew.GetAt(i);
                m_nTotalLinesDel += m_lineDel.GetAt(i);
        }

        // Find first and last interval number.
        if (!m_commitsPerUnitAndAuthor.empty())
        {
                IntervalDataMap::iterator interval_it = m_commitsPerUnitAndAuthor.begin();
                m_firstInterval = interval_it->first;
                interval_it = m_commitsPerUnitAndAuthor.end();
                --interval_it;
                m_lastInterval = interval_it->first;
                // Sanity check - if m_lastInterval is too large it could freeze TSVN and take up all memory!!!
                assert(m_lastInterval >= 0 && m_lastInterval < 10000);
        }
        else
        {
                m_firstInterval = 0;
                m_lastInterval = -1;
        }

        // Get a list of authors names
        LoadListOfAuthors(m_commitsPerAuthor);

        // Calculate percent of Contribution Authors
        for (std::list<tstring>::iterator it = m_authorNames.begin(); it != m_authorNames.end(); ++it)
        {
                m_PercentageOfAuthorship[*it] =  (m_PercentageOfAuthorship[*it] *100)/ AllContributionAuthor;
        }

        // All done, now the statistics pages can retrieve the data and
        // extract the information to be shown.

        return 0;
}

void CStatGraphDlg::FilterSkippedAuthors(std::list<tstring>& included_authors,
                                                                                 std::list<tstring>& skipped_authors)
{
        included_authors.clear();
        skipped_authors.clear();

        unsigned int included_authors_count = m_Skipper.GetPos();
        // if we only leave out one author, still include him with his name
        if (included_authors_count + 1 == m_authorNames.size())
                ++included_authors_count;

        // add the included authors first
        std::list<tstring>::iterator author_it = m_authorNames.begin();
        while (included_authors_count > 0 && author_it != m_authorNames.end())
        {
                // Add him/her to the included list
                included_authors.push_back(*author_it);
                ++author_it;
                --included_authors_count;
        }

        // If we haven't reached the end yet, copy all remaining authors into the
        // skipped author list.
        std::copy(author_it, m_authorNames.end(), std::back_inserter(skipped_authors) );

        // Sort authors alphabetically if user wants that.
        if (!m_bSortByCommitCount)
                included_authors.sort();
}

bool  CStatGraphDlg::PreViewStat(bool fShowLabels)
{
        if (m_parAuthors.IsEmpty() || m_parDates.IsEmpty() || m_parFileChanges.IsEmpty())
                return false;
        ShowLabels(fShowLabels);

        //If view graphic
        if (!fShowLabels) ClearGraph();

        // This function relies on a previous call of GatherData().
        // This can be detected by checking the week count.
        // If the week count is equal to -1, it hasn't been called before.
        if (m_nWeeks == -1)
                GatherData(FALSE, TRUE);
        // If week count is still -1, something bad has happened, probably invalid data!
        if (m_nWeeks == -1)
                return false;

        return true;
}

MyGraphSeries *CStatGraphDlg::PreViewGraph(__in UINT GraphTitle, __in UINT YAxisLabel, __in UINT XAxisLabel /*= nullptr*/)
{
        if(!PreViewStat(false))
                return nullptr;

        // We need at least one author
        if (m_authorNames.empty())
                return nullptr;

        // Add a single series to the chart
        MyGraphSeries * graphData = new MyGraphSeries();
        m_graph.AddSeries(*graphData);
        m_graphDataArray.Add(graphData);

        // Set up the graph.
        CString temp;
        UpdateData();
        m_graph.SetGraphType(m_GraphType, m_bStacked);
        temp.LoadString(YAxisLabel);
        m_graph.SetYAxisLabel(temp);
        temp.LoadString(XAxisLabel);
        m_graph.SetXAxisLabel(temp);
        temp.LoadString(GraphTitle);
        m_graph.SetGraphTitle(temp);

        return graphData;
}

void CStatGraphDlg::ShowPercentageOfAuthorship()
{
        // Set up the graph.
        MyGraphSeries * graphData = PreViewGraph(IDS_STATGRAPH_PERCENTAGE_OF_AUTHORSHIP,
                IDS_STATGRAPH_PERCENTAGE_OF_AUTHORSHIPY,
                IDS_STATGRAPH_COMMITSBYAUTHORMOREX);
        if (!graphData) return;

        // Find out which authors are to be shown and which are to be skipped.
        std::list<tstring> authors;
        std::list<tstring> others;


        FilterSkippedAuthors(authors, others);

        // Loop over all authors in the authors list and
        // add them to the graph.

        if (!authors.empty())
        {
                for (std::list<tstring>::iterator it = authors.begin(); it != authors.end(); ++it)
                {
                        int group = m_graph.AppendGroup(it->c_str());
                        graphData->SetData(group,  RollPercentageOfAuthorship(m_PercentageOfAuthorship[*it]));
                }
        }

        //     If we have other authors, count them and their commits.
        if (!others.empty())
                DrawOthers(others, graphData, m_PercentageOfAuthorship);

        // Paint the graph now that we're through.
        m_graph.Invalidate();
}

void CStatGraphDlg::ShowCommitsByAuthor()
{
        // Set up the graph.
        MyGraphSeries * graphData = PreViewGraph(IDS_STATGRAPH_COMMITSBYAUTHOR,
                IDS_STATGRAPH_COMMITSBYAUTHORY,
                IDS_STATGRAPH_COMMITSBYAUTHORX);
        if (!graphData) return;

        // Find out which authors are to be shown and which are to be skipped.
        std::list<tstring> authors;
        std::list<tstring> others;
        FilterSkippedAuthors(authors, others);

        // Loop over all authors in the authors list and
        // add them to the graph.

        if (!authors.empty())
        {
                for (std::list<tstring>::iterator it = authors.begin(); it != authors.end(); ++it)
                {
                        int group = m_graph.AppendGroup(it->c_str());
                        graphData->SetData(group, m_commitsPerAuthor[*it]);
                }
        }

        //     If we have other authors, count them and their commits.
        if (!others.empty())
                DrawOthers(others, graphData, m_commitsPerAuthor);

        // Paint the graph now that we're through.
        m_graph.Invalidate();
}

void CStatGraphDlg::ShowByDate(int stringx, int title, IntervalDataMap &data)
{
        if(!PreViewStat(false)) return;

        // We need at least one author
        if (m_authorNames.empty()) return;

        // Set up the graph.
        CString temp;
        UpdateData();
        m_graph.SetGraphType(m_GraphType, m_bStacked);
        temp.LoadString(stringx);
        m_graph.SetYAxisLabel(temp);
        temp.LoadString(title);
        m_graph.SetGraphTitle(temp);

        m_graph.SetXAxisLabel(GetUnitString());

        // Find out which authors are to be shown and which are to be skipped.
        std::list<tstring> authors;
        std::list<tstring> others;
        FilterSkippedAuthors(authors, others);

        // Add a graph series for each author.
        AuthorDataMap authorGraphMap;
        for (std::list<tstring>::iterator it = authors.begin(); it != authors.end(); ++it)
                authorGraphMap[*it] = m_graph.AppendGroup(it->c_str());
        // If we have skipped authors, add a graph series for all those.
        CString sOthers(MAKEINTRESOURCE(IDS_STATGRAPH_OTHERGROUP));
        tstring othersName;
        if (!others.empty())
        {
                sOthers.AppendFormat(L" (%Iu)", others.size());
                othersName = (LPCWSTR)sOthers;
                authorGraphMap[othersName] = m_graph.AppendGroup(sOthers);
        }

        // Mapping to collect commit counts in each interval
        AuthorDataMap   commitCount;

        // Loop over all intervals/weeks and collect filtered data.
        // Sum up data in each interval until the time unit changes.
        for (int i=m_lastInterval; i>=m_firstInterval; --i)
        {
                // Collect data for authors listed by name.
                if (!authors.empty())
                {
                        for (std::list<tstring>::iterator it = authors.begin(); it != authors.end(); ++it)
                        {
                                // Do we have some data for the current author in the current interval?
                                AuthorDataMap::const_iterator data_it = data[i].find(*it);
                                if (data_it == data[i].end())
                                        continue;
                                commitCount[*it] += data_it->second;
                        }
                }
                // Collect data for all skipped authors.
                if (!others.empty())
                {
                        for (std::list<tstring>::iterator it = others.begin(); it != others.end(); ++it)
                        {
                                // Do we have some data for the author in the current interval?
                                AuthorDataMap::const_iterator data_it = data[i].find(*it);
                                if (data_it == data[i].end())
                                        continue;
                                commitCount[othersName] += data_it->second;
                        }
                }

                // Create a new data series for this unit/interval.
                MyGraphSeries * graphData = new MyGraphSeries();
                // Loop over all created graphs and set the corresponding data.
                if (!authorGraphMap.empty())
                {
                        for (AuthorDataMap::const_iterator it = authorGraphMap.begin(); it != authorGraphMap.end(); ++it)
                        {
                                graphData->SetData(it->second, commitCount[it->first]);
                        }
                }
                graphData->SetLabel(m_unitNames[i].c_str());
                m_graph.AddSeries(*graphData);
                m_graphDataArray.Add(graphData);

                // Reset commit count mapping.
                commitCount.clear();
        }

        // Paint the graph now that we're through.
        m_graph.Invalidate();
}

void CStatGraphDlg::ShowStats()
{
        if(!PreViewStat(true)) return;

        // Now we can use the gathered data to update the stats dialog.
        size_t nAuthors = m_authorNames.size();

        // Find most and least active author names.
        tstring mostActiveAuthor;
        tstring leastActiveAuthor;
        if (nAuthors > 0)
        {
                mostActiveAuthor = m_authorNames.front();
                leastActiveAuthor = m_authorNames.back();
        }

        // Obtain the statistics for the table.
        long nCommitsMin = -1;
        long nCommitsMax = -1;
        long nFileChangesMin = -1;
        long nFileChangesMax = -1;

        long nMostActiveMaxCommits = -1;
        long nMostActiveMinCommits = -1;
        long nLeastActiveMaxCommits = -1;
        long nLeastActiveMinCommits = -1;

        // Loop over all intervals and find min and max values for commit count and file changes.
        // Also store the stats for the most and least active authors.
        for (int i=m_firstInterval; i<=m_lastInterval; ++i)
        {
                // Loop over all commits in this interval and count the number of commits by all authors.
                int commitCount = 0;
                AuthorDataMap::iterator commit_endit = m_commitsPerUnitAndAuthor[i].end();
                for (AuthorDataMap::iterator commit_it = m_commitsPerUnitAndAuthor[i].begin();
                        commit_it != commit_endit; ++commit_it)
                {
                        commitCount += commit_it->second;
                }
                if (nCommitsMin == -1 || commitCount < nCommitsMin)
                        nCommitsMin = commitCount;
                if (nCommitsMax == -1 || commitCount > nCommitsMax)
                        nCommitsMax = commitCount;

                // Loop over all commits in this interval and count the number of file changes by all authors.
                int fileChangeCount = 0;
                AuthorDataMap::iterator filechange_endit = m_filechangesPerUnitAndAuthor[i].end();
                for (AuthorDataMap::iterator filechange_it = m_filechangesPerUnitAndAuthor[i].begin();
                        filechange_it != filechange_endit; ++filechange_it)
                {
                        fileChangeCount += filechange_it->second;
                }
                if (nFileChangesMin == -1 || fileChangeCount < nFileChangesMin)
                        nFileChangesMin = fileChangeCount;
                if (nFileChangesMax == -1 || fileChangeCount > nFileChangesMax)
                        nFileChangesMax = fileChangeCount;

                // also get min/max data for most and least active authors
                if (nAuthors > 0)
                {
                        // check if author is present in this interval
                        AuthorDataMap::iterator author_it = m_commitsPerUnitAndAuthor[i].find(mostActiveAuthor);
                        long authorCommits;
                        if (author_it == m_commitsPerUnitAndAuthor[i].end())
                                authorCommits = 0;
                        else
                                authorCommits = author_it->second;
                        if (nMostActiveMaxCommits == -1 || authorCommits > nMostActiveMaxCommits)
                                nMostActiveMaxCommits = authorCommits;
                        if (nMostActiveMinCommits == -1 || authorCommits < nMostActiveMinCommits)
                                nMostActiveMinCommits = authorCommits;

                        author_it = m_commitsPerUnitAndAuthor[i].find(leastActiveAuthor);
                        if (author_it == m_commitsPerUnitAndAuthor[i].end())
                                authorCommits = 0;
                        else
                                authorCommits = author_it->second;
                        if (nLeastActiveMaxCommits == -1 || authorCommits > nLeastActiveMaxCommits)
                                nLeastActiveMaxCommits = authorCommits;
                        if (nLeastActiveMinCommits == -1 || authorCommits < nLeastActiveMinCommits)
                                nLeastActiveMinCommits = authorCommits;
                }
        }
        if (nMostActiveMaxCommits == -1)    nMostActiveMaxCommits = 0;
        if (nMostActiveMinCommits == -1)    nMostActiveMinCommits = 0;
        if (nLeastActiveMaxCommits == -1)   nLeastActiveMaxCommits = 0;
        if (nLeastActiveMinCommits == -1)   nLeastActiveMinCommits = 0;

        int nWeeks = m_lastInterval-m_firstInterval;
        if (nWeeks == 0)
                nWeeks = 1;
        // Adjust the labels with the unit type (week, month, ...)
        CString labelText;
        labelText.Format(IDS_STATGRAPH_NUMBEROFUNIT, (LPCTSTR)GetUnitString());
        SetDlgItemText(IDC_NUMWEEK, labelText);
        labelText.Format(IDS_STATGRAPH_COMMITSBYUNIT, (LPCTSTR)GetUnitString());
        SetDlgItemText(IDC_COMMITSEACHWEEK, labelText);
        labelText.Format(IDS_STATGRAPH_FILECHANGESBYUNIT, (LPCTSTR)GetUnitString());
        SetDlgItemText(IDC_FILECHANGESEACHWEEK, (LPCTSTR)labelText);
        // We have now all data we want and we can fill in the labels...
        CString number;
        number.Format(L"%d", nWeeks);
        SetDlgItemText(IDC_NUMWEEKVALUE, number);
        number.Format(L"%Iu", nAuthors);
        SetDlgItemText(IDC_NUMAUTHORVALUE, number);
        number.Format(L"%Id", m_nTotalCommits);
        SetDlgItemText(IDC_NUMCOMMITSVALUE, number);
        number.Format(L"%ld", m_nTotalFileChanges);
        if (m_bDiffFetched)
                SetDlgItemText(IDC_NUMFILECHANGESVALUE, number);

        number.Format(L"%Id", m_parAuthors.GetCount() / nWeeks);
        SetDlgItemText(IDC_COMMITSEACHWEEKAVG, number);
        number.Format(L"%ld", nCommitsMax);
        SetDlgItemText(IDC_COMMITSEACHWEEKMAX, number);
        number.Format(L"%ld", nCommitsMin);
        SetDlgItemText(IDC_COMMITSEACHWEEKMIN, number);

        number.Format(L"%ld", m_nTotalFileChanges / nWeeks);
        //SetDlgItemText(IDC_FILECHANGESEACHWEEKAVG, number);
        number.Format(L"%ld", nFileChangesMax);
        //SetDlgItemText(IDC_FILECHANGESEACHWEEKMAX, number);
        number.Format(L"%ld", nFileChangesMin);
        //SetDlgItemText(IDC_FILECHANGESEACHWEEKMIN, number);

        number.Format(L"%ld (%ld (+) %ld (-))", m_nTotalLinesInc + m_nTotalLinesDec, m_nTotalLinesInc, m_nTotalLinesDec);
        if (m_bDiffFetched)
                SetDlgItemText(IDC_TOTAL_LINE_WITHOUT_NEW_DEL_VALUE, number);
        number.Format(L"%ld (%ld (+) %ld (-))", m_nTotalLinesInc + m_nTotalLinesDec + m_nTotalLinesNew + m_nTotalLinesDel,
                                                                                                m_nTotalLinesInc + m_nTotalLinesNew, m_nTotalLinesDec + m_nTotalLinesDel);
        if (m_bDiffFetched)
                SetDlgItemText(IDC_TOTAL_LINE_WITH_NEW_DEL_VALUE, number);

        if (nAuthors == 0)
        {
                SetDlgItemText(IDC_MOSTACTIVEAUTHORNAME, L"");
                SetDlgItemText(IDC_MOSTACTIVEAUTHORAVG, L"0");
                SetDlgItemText(IDC_MOSTACTIVEAUTHORMAX, L"0");
                SetDlgItemText(IDC_MOSTACTIVEAUTHORMIN, L"0");
                SetDlgItemText(IDC_LEASTACTIVEAUTHORNAME, L"");
                SetDlgItemText(IDC_LEASTACTIVEAUTHORAVG, L"0");
                SetDlgItemText(IDC_LEASTACTIVEAUTHORMAX, L"0");
                SetDlgItemText(IDC_LEASTACTIVEAUTHORMIN, L"0");
        }
        else
        {
                SetDlgItemText(IDC_MOSTACTIVEAUTHORNAME, mostActiveAuthor.c_str());
                number.Format(L"%ld", m_commitsPerAuthor[mostActiveAuthor] / nWeeks);
                SetDlgItemText(IDC_MOSTACTIVEAUTHORAVG, number);
                number.Format(L"%ld", nMostActiveMaxCommits);
                SetDlgItemText(IDC_MOSTACTIVEAUTHORMAX, number);
                number.Format(L"%ld", nMostActiveMinCommits);
                SetDlgItemText(IDC_MOSTACTIVEAUTHORMIN, number);

                SetDlgItemText(IDC_LEASTACTIVEAUTHORNAME, leastActiveAuthor.c_str());
                number.Format(L"%ld", m_commitsPerAuthor[leastActiveAuthor] / nWeeks);
                SetDlgItemText(IDC_LEASTACTIVEAUTHORAVG, number);
                number.Format(L"%ld", nLeastActiveMaxCommits);
                SetDlgItemText(IDC_LEASTACTIVEAUTHORMAX, number);
                number.Format(L"%ld", nLeastActiveMinCommits);
                SetDlgItemText(IDC_LEASTACTIVEAUTHORMIN, number);
        }
}

int CStatGraphDlg::RollPercentageOfAuthorship(double it)
{ return (int)it + (it - (int)it >= 0.5);}

void CStatGraphDlg::OnCbnSelchangeGraphcombo()
{
        UpdateData();

        Metrics useMetric = (Metrics) m_cGraphType.GetItemData(m_cGraphType.GetCurSel());
        switch (useMetric )
        {
        case AllStat:
        case CommitsByDate:
                // by date
                m_btnGraphLine.EnableWindow(TRUE);
                m_btnGraphLineStacked.EnableWindow(TRUE);
                m_btnGraphPie.EnableWindow(TRUE);
                m_GraphType = MyGraph::Line;
                m_bStacked = false;
                break;
        case PercentageOfAuthorship:
        case CommitsByAuthor:
                // by author
                m_btnGraphLine.EnableWindow(FALSE);
                m_btnGraphLineStacked.EnableWindow(FALSE);
                m_btnGraphPie.EnableWindow(TRUE);
                m_GraphType = MyGraph::Bar;
                m_bStacked = false;
                break;
        }
        RedrawGraph();
}


int CStatGraphDlg::GetUnitCount()
{
        if (m_nDays < 8)
                return m_nDays;
        if (m_nWeeks < 15)
                return m_nWeeks;
        if (m_nWeeks < 80)
                return (m_nWeeks/4)+1;
        if (m_nWeeks < 320)
                return (m_nWeeks/13)+1; // quarters
        return (m_nWeeks/52)+1;
}

int CStatGraphDlg::GetUnit(const CTime& time)
{
        if (m_nDays < 8)
                return time.GetMonth()*100 + time.GetDay(); // month*100+day as the unit
        if (m_nWeeks < 15)
                return GetCalendarWeek(time);
        if (m_nWeeks < 80)
                return time.GetMonth();
        if (m_nWeeks < 320)
                return ((time.GetMonth()-1)/3)+1; // quarters
        return time.GetYear();
}

CStatGraphDlg::UnitType CStatGraphDlg::GetUnitType()
{
        if (m_nDays < 8)
                return Days;
        if (m_nWeeks < 15)
                return Weeks;
        if (m_nWeeks < 80)
                return Months;
        if (m_nWeeks < 320)
                return Quarters;
        return Years;
}

CString CStatGraphDlg::GetUnitString()
{
        if (m_nDays < 8)
                return CString(MAKEINTRESOURCE(IDS_STATGRAPH_COMMITSBYDATEXDAY));
        if (m_nWeeks < 15)
                return CString(MAKEINTRESOURCE(IDS_STATGRAPH_COMMITSBYDATEXWEEK));
        if (m_nWeeks < 80)
                return CString(MAKEINTRESOURCE(IDS_STATGRAPH_COMMITSBYDATEXMONTH));
        if (m_nWeeks < 320)
                return CString(MAKEINTRESOURCE(IDS_STATGRAPH_COMMITSBYDATEXQUARTER));
        return CString(MAKEINTRESOURCE(IDS_STATGRAPH_COMMITSBYDATEXYEAR));
}

CString CStatGraphDlg::GetUnitLabel(int unit, CTime &lasttime)
{
        CString temp;
        switch (GetUnitType())
        {
        case Days:
                {
                        // month*100+day as the unit
                        int day = unit % 100;
                        int month = unit / 100;
                        switch (m_langOrder)
                        {
                        case 0: // month day year
                                temp.Format(L"%d/%d/%.2d", month, day, lasttime.GetYear() % 100);
                                break;
                        case 1: // day month year
                        default:
                                temp.Format(L"%d/%d/%.2d", day, month, lasttime.GetYear() % 100);
                                break;
                        case 2: // year month day
                                temp.Format(L"%.2d/%d/%d", lasttime.GetYear() % 100, month, day);
                                break;
                        }
                }
                break;
        case Weeks:
                {
                        int year = lasttime.GetYear();
                        if ((unit == 1)&&(lasttime.GetMonth() == 12))
                                year += 1;

                        switch (m_langOrder)
                        {
                        case 0: // month day year
                        case 1: // day month year
                        default:
                                temp.Format(L"%d/%.2d", unit, year % 100);
                                break;
                        case 2: // year month day
                                temp.Format(L"%.2d/%d", year % 100, unit);
                                break;
                        }
                }
                break;
        case Months:
                switch (m_langOrder)
                {
                case 0: // month day year
                case 1: // day month year
                default:
                        temp.Format(L"%d/%.2d", unit, lasttime.GetYear() % 100);
                        break;
                case 2: // year month day
                        temp.Format(L"%.2d/%d", lasttime.GetYear() % 100, unit);
                        break;
                }
                break;
        case Quarters:
                switch (m_langOrder)
                {
                case 0: // month day year
                case 1: // day month year
                default:
                        temp.Format(L"%d/%.2d", unit, lasttime.GetYear() % 100);
                        break;
                case 2: // year month day
                        temp.Format(L"%.2d/%d", lasttime.GetYear() % 100, unit);
                        break;
                }
                break;
        case Years:
                temp.Format(L"%d", unit);
                break;
        }
        return temp;
}

void CStatGraphDlg::OnHScroll(UINT nSBCode, UINT nPos, CScrollBar* pScrollBar)
{
        if (nSBCode == TB_THUMBTRACK)
                return CDialog::OnHScroll(nSBCode, nPos, pScrollBar);

        ShowSelectStat((Metrics) m_cGraphType.GetItemData(m_cGraphType.GetCurSel()));
        CDialog::OnHScroll(nSBCode, nPos, pScrollBar);
}

void CStatGraphDlg::OnNeedText(NMHDR *pnmh, LRESULT * /*pResult*/)
{
        TOOLTIPTEXT* pttt = (TOOLTIPTEXT*) pnmh;
        if (pttt->hdr.idFrom == (UINT_PTR) m_Skipper.GetSafeHwnd())
        {
                size_t included_authors_count = m_Skipper.GetPos();
                // if we only leave out one author, still include him with his name
                if (included_authors_count + 1 == m_authorNames.size())
                        ++included_authors_count;

                // find the minimum number of commits that the shown authors have
                int min_commits = 0;
                included_authors_count = min(included_authors_count, m_authorNames.size());
                std::list<tstring>::iterator author_it = m_authorNames.begin();
                advance(author_it, included_authors_count);
                if (author_it != m_authorNames.begin())
                        min_commits = m_commitsPerAuthor[ *(--author_it) ];

                CString string;
                int percentage = int(min_commits*100.0/(m_nTotalCommits ? m_nTotalCommits : 1));
                string.Format(IDS_STATGRAPH_AUTHORSLIDER_TT, m_Skipper.GetPos(), min_commits, percentage);
                StringCchCopy(pttt->szText, _countof(pttt->szText), (LPCTSTR) string);
        }
}

void CStatGraphDlg::AuthorsCaseSensitiveChanged()
{
        UpdateData();   // update checkbox state
        GatherData(FALSE, TRUE);   // first regenerate the statistics data
        RedrawGraph();  // then update the current statistics page
}

void CStatGraphDlg::SortModeChanged()
{
        UpdateData();   // update checkbox state
        RedrawGraph();  // then update the current statistics page
}

void CStatGraphDlg::OnBnClickedCommitternames()
{
        UpdateData();   // update checkbox state
        GatherData(FALSE, TRUE);   // first regenerate the statistics data
        RedrawGraph();  // then update the current statistics page
}

void CStatGraphDlg::OnBnClickedCommitdates()
{
        UpdateData();   // update checkbox state
        GatherData(FALSE, TRUE);   // first regenerate the statistics data
        RedrawGraph();  // then update the current statistics page
}

void CStatGraphDlg::ClearGraph()
{
        m_graph.Clear();
        for (int j=0; j<m_graphDataArray.GetCount(); ++j)
                delete ((MyGraphSeries *)m_graphDataArray.GetAt(j));
        m_graphDataArray.RemoveAll();
}

void CStatGraphDlg::RedrawGraph()
{
        EnableDisableMenu();
        m_btnGraphBar.SetState(BST_UNCHECKED);
        m_btnGraphBarStacked.SetState(BST_UNCHECKED);
        m_btnGraphLine.SetState(BST_UNCHECKED);
        m_btnGraphLineStacked.SetState(BST_UNCHECKED);
        m_btnGraphPie.SetState(BST_UNCHECKED);

        if ((m_GraphType == MyGraph::Bar)&&(m_bStacked))
        {
                m_btnGraphBarStacked.SetState(BST_CHECKED);
        }
        if ((m_GraphType == MyGraph::Bar)&&(!m_bStacked))
        {
                m_btnGraphBar.SetState(BST_CHECKED);
        }
        if ((m_GraphType == MyGraph::Line)&&(m_bStacked))
        {
                m_btnGraphLineStacked.SetState(BST_CHECKED);
        }
        if ((m_GraphType == MyGraph::Line)&&(!m_bStacked))
        {
                m_btnGraphLine.SetState(BST_CHECKED);
        }
        if (m_GraphType == MyGraph::PieChart)
        {
                m_btnGraphPie.SetState(BST_CHECKED);
        }

        UpdateData();
        ShowSelectStat((Metrics) m_cGraphType.GetItemData(m_cGraphType.GetCurSel()), true);
}
void CStatGraphDlg::OnBnClickedGraphbarbutton()
{
        m_GraphType = MyGraph::Bar;
        m_bStacked = false;
        RedrawGraph();
}

void CStatGraphDlg::OnBnClickedGraphbarstackedbutton()
{
        m_GraphType = MyGraph::Bar;
        m_bStacked = true;
        RedrawGraph();
}

void CStatGraphDlg::OnBnClickedGraphlinebutton()
{
        m_GraphType = MyGraph::Line;
        m_bStacked = false;
        RedrawGraph();
}

void CStatGraphDlg::OnBnClickedGraphlinestackedbutton()
{
        m_GraphType = MyGraph::Line;
        m_bStacked = true;
        RedrawGraph();
}

void CStatGraphDlg::OnBnClickedGraphpiebutton()
{
        m_GraphType = MyGraph::PieChart;
        m_bStacked = false;
        RedrawGraph();
}

void CStatGraphDlg::EnableDisableMenu()
{
        UINT nEnable = MF_BYCOMMAND;

        Metrics SelectMetric = (Metrics) m_cGraphType.GetItemData(m_cGraphType.GetCurSel());

        nEnable |= (SelectMetric > TextStatStart && SelectMetric < TextStatEnd)
                ? (MF_DISABLED | MF_GRAYED) : MF_ENABLED;

        GetMenu()->EnableMenuItem(ID_FILE_SAVESTATGRAPHAS, nEnable);
}

void CStatGraphDlg::OnFileSavestatgraphas()
{
        CString tempfile;
        int filterindex = 0;
        if (CAppUtils::FileOpenSave(tempfile, &filterindex, IDS_REVGRAPH_SAVEPIC, IDS_STATPICFILEFILTER, false, m_hWnd))
        {
                // if the user doesn't specify a file extension, default to
                // wmf and add that extension to the filename. But only if the
                // user chose the 'pictures' filter. The filename isn't changed
                // if the 'All files' filter was chosen.
                CString extension;
                int dotPos = tempfile.ReverseFind('.');
                int slashPos = tempfile.ReverseFind('\\');
                if (dotPos > slashPos)
                        extension = tempfile.Mid(dotPos);
                if ((filterindex == 1)&&(extension.IsEmpty()))
                {
                        extension = L".wmf";
                        tempfile += extension;
                }
                SaveGraph(tempfile);
        }
}

void CStatGraphDlg::SaveGraph(CString sFilename)
{
        CString extension = CPathUtils::GetFileExtFromPath(sFilename);
        if (extension.CompareNoCase(L".wmf") == 0)
        {
                // save the graph as an enhanced meta file
                CMyMetaFileDC wmfDC;
                wmfDC.CreateEnhanced(nullptr, sFilename, nullptr, L"TortoiseGit\0Statistics\0\0");
                wmfDC.SetAttribDC(GetDC()->GetSafeHdc());
                RedrawGraph();
                m_graph.DrawGraph(wmfDC);
                HENHMETAFILE hemf = wmfDC.CloseEnhanced();
                DeleteEnhMetaFile(hemf);
        }
        else
        {
                // save the graph as a pixel picture instead of a vector picture
                // create dc to paint on
                try
                {
                        CWindowDC ddc(this);
                        CDC dc;
                        if (!dc.CreateCompatibleDC(&ddc))
                        {
                                ShowErrorMessage();
                                return;
                        }
                        CRect rect;
                        GetDlgItem(IDC_GRAPH)->GetClientRect(&rect);
                        HBITMAP hbm = ::CreateCompatibleBitmap(ddc.m_hDC, rect.Width(), rect.Height());
                        if (hbm==0)
                        {
                                ShowErrorMessage();
                                return;
                        }
                        HBITMAP oldbm = (HBITMAP)dc.SelectObject(hbm);
                        // paint the whole graph
                        RedrawGraph();
                        m_graph.DrawGraph(dc);
                        // now use GDI+ to save the picture
                        CLSID encoderClsid;
                        GdiplusStartupInput gdiplusStartupInput;
                        ULONG_PTR gdiplusToken;
                        CString sErrormessage;
                        if (GdiplusStartup(&gdiplusToken, &gdiplusStartupInput, nullptr) == Ok)
                        {
                                {
                                        Bitmap bitmap(hbm, nullptr);
                                        if (bitmap.GetLastStatus()==Ok)
                                        {
                                                // Get the CLSID of the encoder.
                                                int ret = 0;
                                                if (CPathUtils::GetFileExtFromPath(sFilename).CompareNoCase(L".png") == 0)
                                                        ret = GetEncoderClsid(L"image/png", &encoderClsid);
                                                else if (CPathUtils::GetFileExtFromPath(sFilename).CompareNoCase(L".jpg") == 0)
                                                        ret = GetEncoderClsid(L"image/jpeg", &encoderClsid);
                                                else if (CPathUtils::GetFileExtFromPath(sFilename).CompareNoCase(L".jpeg") == 0)
                                                        ret = GetEncoderClsid(L"image/jpeg", &encoderClsid);
                                                else if (CPathUtils::GetFileExtFromPath(sFilename).CompareNoCase(L".bmp") == 0)
                                                        ret = GetEncoderClsid(L"image/bmp", &encoderClsid);
                                                else if (CPathUtils::GetFileExtFromPath(sFilename).CompareNoCase(L".gif") == 0)
                                                        ret = GetEncoderClsid(L"image/gif", &encoderClsid);
                                                else
                                                {
                                                        sFilename += L".jpg";
                                                        ret = GetEncoderClsid(L"image/jpeg", &encoderClsid);
                                                }
                                                if (ret >= 0)
                                                {
                                                        CStringW tfile = CStringW(sFilename);
                                                        bitmap.Save(tfile, &encoderClsid, nullptr);
                                                }
                                                else
                                                        sErrormessage.Format(IDS_REVGRAPH_ERR_NOENCODER, (LPCTSTR)CPathUtils::GetFileExtFromPath(sFilename));
                                        }
                                        else
                                                sErrormessage.LoadString(IDS_REVGRAPH_ERR_NOBITMAP);
                                }
                                GdiplusShutdown(gdiplusToken);
                        }
                        else
                                sErrormessage.LoadString(IDS_REVGRAPH_ERR_GDIINIT);
                        dc.SelectObject(oldbm);
                        dc.DeleteDC();
                        if (!sErrormessage.IsEmpty())
                                ::MessageBox(m_hWnd, sErrormessage, L"TortoiseGit", MB_ICONERROR);
                }
                catch (CException * pE)
                {
                        TCHAR szErrorMsg[2048] = { 0 };
                        pE->GetErrorMessage(szErrorMsg, 2048);
                        pE->Delete();
                        ::MessageBox(m_hWnd, szErrorMsg, L"TortoiseGit", MB_ICONERROR);
                }
        }
}

int CStatGraphDlg::GetEncoderClsid(const WCHAR* format, CLSID* pClsid)
{
        UINT  num = 0;          // number of image encoders
        UINT  size = 0;         // size of the image encoder array in bytes

        if (GetImageEncodersSize(&num, &size)!=Ok)
                return -1;
        if (size == 0)
                return -1;  // Failure

        auto pMem = std::make_unique<BYTE[]>(size);
        auto pImageCodecInfo = (ImageCodecInfo*)(pMem.get());
        if (!pImageCodecInfo)
                return -1;  // Failure

        if (GetImageEncoders(num, size, pImageCodecInfo)==Ok)
        {
                for (UINT j = 0; j < num; ++j)
                {
                        if (wcscmp(pImageCodecInfo[j].MimeType, format) == 0)
                        {
                                *pClsid = pImageCodecInfo[j].Clsid;
                                return j;  // Success
                        }
                }
        }
        return -1;  // Failure
}

void CStatGraphDlg::StoreCurrentGraphType()
{
        UpdateData();
        DWORD graphtype = static_cast<DWORD>(m_cGraphType.GetItemData(m_cGraphType.GetCurSel()));
        // encode the current chart type
        DWORD statspage = graphtype*10;
        if ((m_GraphType == MyGraph::Bar)&&(m_bStacked))
                statspage += 1;
        if ((m_GraphType == MyGraph::Bar)&&(!m_bStacked))
                statspage += 2;
        if ((m_GraphType == MyGraph::Line)&&(m_bStacked))
                statspage += 3;
        if ((m_GraphType == MyGraph::Line)&&(!m_bStacked))
                statspage += 4;
        if (m_GraphType == MyGraph::PieChart)
                statspage += 5;

        // store current chart type in registry
        CRegDWORD lastStatsPage(L"Software\\TortoiseGit\\LastViewedStatsPage", 0);
        lastStatsPage = statspage;

        CRegDWORD regAuthors(L"Software\\TortoiseGit\\StatAuthorsCaseSensitive");
        regAuthors = m_bAuthorsCaseSensitive;

        CRegDWORD regSort(L"Software\\TortoiseGit\\StatSortByCommitCount");
        regSort = m_bSortByCommitCount;

        CRegDWORD regCommitterName(L"Software\\TortoiseGit\\StatCommiterNames");
        regCommitterName = m_bUseCommitterNames;

        CRegDWORD regCommitDates(L"Software\\TortoiseGit\\StatCommitDates");
        regCommitDates = m_bUseCommitDates;
}

void CStatGraphDlg::ShowErrorMessage()
{
        CFormatMessageWrapper errorDetails;
        if (errorDetails)
                MessageBox(errorDetails, L"Error", MB_OK | MB_ICONINFORMATION);
}

void CStatGraphDlg::ShowSelectStat(Metrics SelectedMetric, bool reloadSkiper /* = false */)
{
        switch (SelectedMetric)
        {
                case AllStat:
                        LoadListOfAuthors(m_commitsPerAuthor, reloadSkiper);
                        ShowStats();
                        break;
                case CommitsByDate:
                        LoadListOfAuthors(m_commitsPerAuthor, reloadSkiper);
                        ShowByDate(IDS_STATGRAPH_COMMITSBYDATEY, IDS_STATGRAPH_COMMITSBYDATE, m_commitsPerUnitAndAuthor);
                        break;
                case LinesWByDate:
                        OnBnClickedFetchDiff();
                        LoadListOfAuthors(m_commitsPerAuthor, reloadSkiper);
                        ShowByDate(IDS_STATGRAPH_LINES_BYDATE_W_Y, IDS_STATGRAPH_LINES_BYDATE_W, m_LinesWPerUnitAndAuthor);
                        break;
                case LinesWOByDate:
                        OnBnClickedFetchDiff();
                        LoadListOfAuthors(m_commitsPerAuthor, reloadSkiper);
                        ShowByDate(IDS_STATGRAPH_LINES_BYDATE_WO_Y, IDS_STATGRAPH_LINES_BYDATE_WO, m_LinesWOPerUnitAndAuthor);
                        break;
                case CommitsByAuthor:
                        LoadListOfAuthors(m_commitsPerAuthor, reloadSkiper);
                        ShowCommitsByAuthor();
                        break;
                case PercentageOfAuthorship:
                        OnBnClickedFetchDiff();
                        LoadListOfAuthors(m_PercentageOfAuthorship, reloadSkiper, true);
                        ShowPercentageOfAuthorship();
                        break;
                default:
                        ShowErrorMessage();
        }
}

double CStatGraphDlg::CoeffContribution(int distFromEnd) { return distFromEnd  ? 1.0 / m_CoeffAuthorShip * distFromEnd : 1;}


template <class MAP>
void CStatGraphDlg::DrawOthers(const std::list<tstring> &others, MyGraphSeries *graphData, MAP &map)
{
        int  nCommits = 0;
        for (std::list<tstring>::const_iterator it = others.begin(); it != others.end(); ++it)
                nCommits += RollPercentageOfAuthorship(map[*it]);

        CString sOthers(MAKEINTRESOURCE(IDS_STATGRAPH_OTHERGROUP));
        sOthers.AppendFormat(L" (%Iu)", others.size());
        int group = m_graph.AppendGroup(sOthers);
        graphData->SetData(group, (int)nCommits);
}


template <class MAP>
void CStatGraphDlg::LoadListOfAuthors (MAP &map, bool reloadSkiper/*= false*/,  bool compare /*= false*/)
{
        m_authorNames.clear();
        if (!map.empty())
        {
                for (MAP::const_iterator it = map.begin(); it != map.end(); ++it)
                {
                        if ((compare && RollPercentageOfAuthorship(map[it->first]) != 0) || !compare)
                                m_authorNames.push_back(it->first);
                }
        }

        // Sort the list of authors based on commit count
        m_authorNames.sort(MoreCommitsThan<MAP::mapped_type>(map));

        // Set Skipper
        SetSkipper(reloadSkiper);
}


void CStatGraphDlg::OnBnClickedFetchDiff()
{
        if (m_bDiffFetched)
                return;
        if (GatherData(TRUE))
                return;
        this->m_bDiffFetched = TRUE;
        GetDlgItem(IDC_CALC_DIFF)->ShowWindow(!m_bDiffFetched);

        ShowStats();
}