/*
 *  Copyright (C) 1999-2002 Bernd Gehrmann
 *                          bernd@mail.berlios.de
 *  Copyright (c) 2002-2004 Christian Loose <christian.loose@kdemail.net>
 *
 * 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, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
 */

#include "logdialog.h"

#include <KComboBox>
#include <KTextEdit>
#include <QTabWidget>
#include <QUrl>
#include <qfile.h>
#include <qfileinfo.h>
#include <qlabel.h>
#include <qlayout.h>
#include <qpushbutton.h>
#include <qsplitter.h>
#include <qtextstream.h>

#include <KConfigGroup>
#include <KHelpClient>
#include <KLocalizedString>
#include <kconfig.h>
#include <kconfiggroup.h>
#include <kfinddialog.h>
#include <kmessagebox.h>
#include <krun.h>
#include <ktreewidgetsearchline.h>

#include <KGuiItem>
#include <QDialogButtonBox>
#include <QFileDialog>
#include <QPushButton>
#include <QVBoxLayout>

#include "annotatecontroller.h"
#include "annotatedialog.h"
#include "cvsserviceinterface.h"
#include "debug.h"
#include "diffdialog.h"
#include "loglist.h"
#include "logplainview.h"
#include "logtree.h"
#include "misc.h"
#include "patchoptiondialog.h"
#include "progressdialog.h"

LogDialog::LogDialog(KConfig &cfg, QWidget *parent)
    : QDialog(parent)
    , cvsService(0)
    , partConfig(cfg)
{
    auto mainLayout = new QVBoxLayout;
    setLayout(mainLayout);

    splitter = new QSplitter(Qt::Vertical, this);
    mainLayout->addWidget(splitter);

    tree = new LogTreeView(this);
    connect(tree, SIGNAL(revisionClicked(QString, bool)), this, SLOT(revisionSelected(QString, bool)));

    auto listWidget = new QWidget(this);
    auto listLayout = new QVBoxLayout(listWidget);
    auto searchLayout = new QHBoxLayout();
    listLayout->addLayout(searchLayout);

    list = new LogListView(partConfig, listWidget);
    listLayout->addWidget(list, 1);

    auto searchLine = new KTreeWidgetSearchLine(listWidget, list);
    auto searchLabel = new QLabel(i18n("Search:"), listWidget);
    searchLabel->setBuddy(searchLine);
    searchLayout->addWidget(searchLabel);
    searchLayout->addWidget(searchLine, 1);

    connect(list, SIGNAL(revisionClicked(QString, bool)), this, SLOT(revisionSelected(QString, bool)));

    plain = new LogPlainView(this);
    connect(plain, SIGNAL(revisionClicked(QString, bool)), this, SLOT(revisionSelected(QString, bool)));

    tabWidget = new QTabWidget;
    tabWidget->addTab(tree, i18n("&Tree"));
    tabWidget->addTab(listWidget, i18n("&List"));
    tabWidget->addTab(plain, i18n("CVS &Output"));
    splitter->addWidget(tabWidget);
    splitter->setStretchFactor(0, 1);

    connect(tabWidget, &QTabWidget::currentChanged, this, &LogDialog::tabChanged);

    tree->setWhatsThis(
        i18n("Choose revision A by clicking with the left "
             "mouse button,\nrevision B by clicking with "
             "the middle mouse button."));

    auto mainWidget = new QWidget;
    splitter->addWidget(mainWidget);
    QBoxLayout *layout = new QVBoxLayout(mainWidget);
    layout->setContentsMargins(0, 0, 0, 0);

    for (int i = 0; i < 2; ++i) {
        if (i == 1) {
            auto frame = new QFrame(mainWidget);
            frame->setFrameStyle(QFrame::HLine | QFrame::Sunken);
            layout->addWidget(frame);
        }

        auto grid = new QGridLayout();
        layout->addLayout(grid);
        grid->setRowStretch(0, 0);
        grid->setRowStretch(1, 0);
        grid->setRowStretch(2, 1);
        grid->setColumnStretch(0, 0);
        grid->setColumnStretch(1, 1);
        grid->setColumnStretch(2, 0);
        grid->setColumnStretch(3, 1);
        grid->setColumnStretch(4, 2);

        QString versionident = (i == 0) ? i18n("Revision A:") : i18n("Revision B:");
        auto versionlabel = new QLabel(versionident, mainWidget);
        grid->addWidget(versionlabel, 0, 0);

        revbox[i] = new QLabel(mainWidget);
        revbox[i]->setFrameStyle(QFrame::Panel | QFrame::Sunken);
        revbox[i]->setTextInteractionFlags(Qt::TextSelectableByMouse);
        grid->addWidget(revbox[i], 0, 1, Qt::AlignVCenter);

        auto selectlabel = new QLabel(i18n("Select by tag:"), mainWidget);
        grid->addWidget(selectlabel, 0, 2);

        tagcombo[i] = new KComboBox(mainWidget);
        QFontMetrics fm(tagcombo[i]->fontMetrics());
        tagcombo[i]->setMinimumWidth(fm.width("X") * 20);
        grid->addWidget(tagcombo[i], 0, 3);

        auto authorlabel = new QLabel(i18n("Author:"), mainWidget);
        grid->addWidget(authorlabel, 1, 0);

        authorbox[i] = new QLabel(mainWidget);
        authorbox[i]->setFrameStyle(QFrame::Panel | QFrame::Sunken);
        authorbox[i]->setTextInteractionFlags(Qt::TextSelectableByMouse);
        grid->addWidget(authorbox[i], 1, 1);

        auto datelabel = new QLabel(i18n("Date:"), mainWidget);
        grid->addWidget(datelabel, 1, 2);

        datebox[i] = new QLabel(mainWidget);
        datebox[i]->setFrameStyle(QFrame::Panel | QFrame::Sunken);
        datebox[i]->setTextInteractionFlags(Qt::TextSelectableByMouse);
        grid->addWidget(datebox[i], 1, 3);

        auto commentlabel = new QLabel(i18n("Comment/Tags:"), mainWidget);
        grid->addWidget(commentlabel, 2, 0);

        commentbox[i] = new KTextEdit(mainWidget);
        commentbox[i]->setReadOnly(true);
        fm = commentbox[i]->fontMetrics();
        commentbox[i]->setMinimumHeight(2 * fm.lineSpacing() + 10);
        grid->addWidget(commentbox[i], 2, 1, 1, 3);

        tagsbox[i] = new KTextEdit(mainWidget);
        tagsbox[i]->setReadOnly(true);
        tagsbox[i]->setMinimumHeight(2 * fm.lineSpacing() + 10);
        grid->addWidget(tagsbox[i], 0, 4, 3, 1);
    }

    buttonBox = new QDialogButtonBox(QDialogButtonBox::Ok | QDialogButtonBox::Help | QDialogButtonBox::Close | QDialogButtonBox::Apply);

    okButton = buttonBox->button(QDialogButtonBox::Ok);
    okButton->setShortcut(Qt::CTRL | Qt::Key_Return);
    connect(okButton, &QPushButton::clicked, this, &LogDialog::slotOk);

    user1Button = new QPushButton;
    buttonBox->addButton(user1Button, QDialogButtonBox::ActionRole);

    user2Button = new QPushButton;
    buttonBox->addButton(user2Button, QDialogButtonBox::ActionRole);

    user3Button = new QPushButton;
    buttonBox->addButton(user3Button, QDialogButtonBox::ActionRole);

    connect(buttonBox, SIGNAL(rejected()), this, SLOT(reject()));

    KGuiItem::assign(user1Button, KGuiItem(i18n("&Annotate A")));
    KGuiItem::assign(user2Button, KGuiItem(i18n("&Diff")));
    KGuiItem::assign(user3Button, KGuiItem(i18n("&Find")));
    user3Button->setVisible(false);

    // initially make the version info widget as small as possible
    splitter->setSizes(QList<int>() << height() << 10);

    revbox[0]->setWhatsThis(
        i18n("This revision is used when you click "
             "Annotate.\nIt is also used as the first "
             "item of a Diff operation."));

    revbox[1]->setWhatsThis(
        i18n("This revision is used as the second "
             "item of a Diff operation."));

    connect(tagcombo[0], SIGNAL(activated(int)), this, SLOT(tagASelected(int)));
    connect(tagcombo[1], SIGNAL(activated(int)), this, SLOT(tagBSelected(int)));

    connect(user1Button, SIGNAL(clicked()), this, SLOT(annotateClicked()));
    connect(user2Button, SIGNAL(clicked()), this, SLOT(diffClicked()));
    connect(user3Button, SIGNAL(clicked()), this, SLOT(findClicked()));

    connect(buttonBox->button(QDialogButtonBox::Apply), SIGNAL(clicked()), this, SLOT(slotPatch()));
    connect(buttonBox, &QDialogButtonBox::helpRequested, this, &LogDialog::slotHelp);

    KGuiItem::assign(okButton, KGuiItem(i18n("&View A")));
    KGuiItem::assign(buttonBox->button(QDialogButtonBox::Apply), KGuiItem(i18n("Create Patch...")));

    mainLayout->addWidget(buttonBox);
    buttonBox->button(QDialogButtonBox::Close)->setDefault(true);

    setAttribute(Qt::WA_DeleteOnClose, true);

    KConfigGroup cg(&partConfig, "LogDialog");
    tabWidget->setCurrentIndex(cg.readEntry("ShowTab", 0));
    restoreGeometry(cg.readEntry<QByteArray>("geometry", QByteArray()));

    splitter->restoreState(cg.readEntry<QByteArray>("Splitter", QByteArray()));

    updateButtons();
}

//--------------------------------------------------------------------------------

LogDialog::~LogDialog()
{
    qDeleteAll(items);
    qDeleteAll(tags);

    KConfigGroup cg(&partConfig, "LogDialog");
    cg.writeEntry("ShowTab", tabWidget->currentIndex());
    cg.writeEntry("geometry", saveGeometry());
    cg.writeEntry("Splitter", splitter->saveState());
}

//--------------------------------------------------------------------------------

bool LogDialog::parseCvsLog(OrgKdeCervisia5CvsserviceCvsserviceInterface *service, const QString &fileName)
{
    QString rev;

    Cervisia::LogInfo logInfo;

    enum { Begin, Tags, Admin, Revision, Author, Branches, Comment, Finished } state;

    // remember DBUS reference and file name for diff or annotate
    cvsService = service;
    filename = fileName;

    setWindowTitle(i18n("CVS Log: %1", filename));

    QDBusReply<QDBusObjectPath> job = cvsService->log(filename);
    if (!job.isValid())
        return false;

    ProgressDialog dlg(this, "Logging", cvsService->service(), job, "log", i18n("CVS Log"));
    if (!dlg.execute())
        return false;

    // process cvs log output
    state = Begin;
    QString line;
    while (dlg.getLine(line)) {
        switch (state) {
        case Begin:
            if (line == "symbolic names:")
                state = Tags;
            break;
        case Tags:
            if (line[0] == '\t') {
                const QStringList strlist(splitLine(line, ':'));
                rev = strlist[1].simplified();
                const QString tag(strlist[0].simplified());
                QString branchpoint;
                int pos1, pos2;
                if ((pos2 = rev.lastIndexOf('.')) > 0 && (pos1 = rev.lastIndexOf('.', pos2 - 1)) > 0 && rev.mid(pos1 + 1, pos2 - pos1 - 1) == "0") {
                    // For a branch tag 2.10.0.6, we want:
                    // branchpoint = "2.10"
                    // rev = "2.10.6"
                    branchpoint = rev.left(pos1);
                    rev.remove(pos1 + 1, pos2 - pos1);
                }
                if (rev != "1.1.1") {
                    auto taginfo = new LogDialogTagInfo;
                    taginfo->rev = rev;
                    taginfo->tag = tag;
                    taginfo->branchpoint = branchpoint;
                    tags.append(taginfo);
                }
            } else {
                state = Admin;
            }
            break;
        case Admin:
            if (line == "----------------------------") {
                state = Revision;
            }
            break;
        case Revision:
            if (line.startsWith(QLatin1String("revision "))) {
                logInfo.m_revision = rev = line.section(' ', 1, 1);
                state = Author;
            }
            break;
        case Author: {
            if (line.startsWith(QLatin1String("date: "))) {
                QStringList strList = line.split(';');

                // convert date into ISO format (YYYY-MM-DDTHH:MM:SS)
                int len = strList[0].length();
                QString dateTimeStr = strList[0].right(len - 6); // remove 'date: '
                dateTimeStr.replace('/', '-');

                QString date = dateTimeStr.section(' ', 0, 0);
                QString time = dateTimeStr.section(' ', 1, 1);
                logInfo.m_dateTime.setTime_t(QDateTime::fromString(date + 'T' + time, Qt::ISODate).toTime_t());

                logInfo.m_author = strList[1].section(':', 1, 1).trimmed();

                state = Branches;
            }
        } break;
        case Branches:
            if (!line.startsWith(QLatin1String("branches:"))) {
                logInfo.m_comment = line;
                state = Comment;
            }
            break;
        case Comment:
            if (line == "----------------------------") {
                QStringList lines = dlg.getOutput();
                if ((lines.count() >= 2) && // at least revision and date line must follow
                    lines[0].startsWith(QLatin1String("revision ")) && lines[1].startsWith(QLatin1String("date: "))) {
                    state = Revision;
                }
            } else if (line == "=============================================================================") {
                state = Finished;
            }
            if (state == Comment) // still in message
                logInfo.m_comment += '\n' + line;
            else {
                // Create tagcomment
                QString branchrev;
                int pos1, pos2;
                // 1.60.x.y => revision belongs to branch 1.60.0.x
                if ((pos2 = rev.lastIndexOf('.')) > 0 && (pos1 = rev.lastIndexOf('.', pos2 - 1)) > 0)
                    branchrev = rev.left(pos2);

                // Build Cervisia::TagInfo for logInfo
                foreach (LogDialogTagInfo *tagInfo, tags) {
                    if (rev == tagInfo->rev) {
                        // This never matches branch tags...
                        logInfo.m_tags.push_back(Cervisia::TagInfo(tagInfo->tag, Cervisia::TagInfo::Tag));
                    }
                    if (rev == tagInfo->branchpoint) {
                        logInfo.m_tags.push_back(Cervisia::TagInfo(tagInfo->tag, Cervisia::TagInfo::Branch));
                    }
                    if (branchrev == tagInfo->rev) {
                        // ... and this never matches ordinary tags :-)
                        logInfo.m_tags.push_back(Cervisia::TagInfo(tagInfo->tag, Cervisia::TagInfo::OnBranch));
                    }
                }

                plain->addRevision(logInfo);
                tree->addRevision(logInfo);
                list->addRevision(logInfo);

                items.append(new Cervisia::LogInfo(logInfo));

                // reset for next entry
                logInfo = Cervisia::LogInfo();
            }
            break;
        case Finished:;
        }
    }

    tagcombo[0]->addItem(QString());
    tagcombo[1]->addItem(QString());
    foreach (LogDialogTagInfo *tagInfo, tags) {
        QString str = tagInfo->tag;
        if (!tagInfo->branchpoint.isEmpty())
            str += i18n(" (Branchpoint)");
        tagcombo[0]->addItem(str);
        tagcombo[1]->addItem(str);
    }

    plain->scrollToTop();

    tree->collectConnections();
    tree->recomputeCellSizes();

    return true; // successful
}

//--------------------------------------------------------------------------------

void LogDialog::slotOk()
{
    // make sure that the user selected a revision
    if (selectionA.isEmpty() && selectionB.isEmpty()) {
        KMessageBox::information(this, i18n("Please select revision A or B first."), "Cervisia");
        return;
    }

    // retrieve the selected revision
    QString revision;
    if (!selectionA.isEmpty())
        revision = selectionA;
    else
        revision = selectionB;

    // create a temporary file
    const QString suffix('-' + revision + '-' + QFileInfo(filename).fileName());
    const QString tempFileName(::tempFileName(suffix));

    // retrieve the file with the selected revision from cvs
    // and save the content into the temporary file
    QDBusReply<QDBusObjectPath> job = cvsService->downloadRevision(filename, revision, tempFileName);
    if (!job.isValid())
        return;

    ProgressDialog dlg(this, "View", cvsService->service(), job, "view", i18n("View File"));
    if (dlg.execute()) {
        // make file read-only
        QFile::setPermissions(tempFileName, QFileDevice::ReadOwner);

        // open file in preferred editor
        (void)new KRun(QUrl::fromLocalFile(tempFileName), 0, true);
    }
}

//--------------------------------------------------------------------------------

void LogDialog::slotPatch()
{
    if (selectionA.isEmpty()) {
        KMessageBox::information(this, i18n("Please select revision A or revisions A and B first."), "Cervisia");
        return;
    }

    Cervisia::PatchOptionDialog optionDlg;
    if (optionDlg.exec() == QDialog::Rejected)
        return;

    QString format = optionDlg.formatOption();
    QString diffOptions = optionDlg.diffOptions();

    QDBusReply<QDBusObjectPath> job = cvsService->diff(filename, selectionA, selectionB, diffOptions, format);
    if (!job.isValid())
        return;

    ProgressDialog dlg(this, "Diff", cvsService->service(), job, "", i18n("CVS Diff"));
    if (!dlg.execute())
        return;

    QString fileName = QFileDialog::getSaveFileName();
    if (fileName.isEmpty())
        return;

    if (!Cervisia::CheckOverwrite(fileName))
        return;

    QFile f(fileName);
    if (!f.open(QIODevice::WriteOnly)) {
        KMessageBox::error(this, i18n("Could not open file for writing."), "Cervisia");
        return;
    }

    QTextStream t(&f);
    QString line;
    while (dlg.getLine(line))
        t << line << '\n';

    f.close();
}

//--------------------------------------------------------------------------------

void LogDialog::slotHelp()
{
    KHelpClient::invokeHelp(QLatin1String("browsinglogs"));
}

//--------------------------------------------------------------------------------

void LogDialog::findClicked()
{
    KFindDialog dlg(this);
    if (dlg.exec() == QDialog::Accepted)
        plain->searchText(dlg.options(), dlg.pattern());
}

void LogDialog::diffClicked()
{
    if (selectionA.isEmpty()) {
        KMessageBox::information(this, i18n("Please select revision A or revisions A and B first."), "Cervisia");
        return;
    }

    // Non-modal dialog
    auto l = new DiffDialog(partConfig);
    if (l->parseCvsDiff(cvsService, filename, selectionA, selectionB))
        l->show();
    else
        delete l;
}

void LogDialog::annotateClicked()
{
    auto l = new AnnotateDialog(partConfig);
    AnnotateController ctl(l, cvsService);
    ctl.showDialog(filename, selectionA);
}

void LogDialog::revisionSelected(QString rev, bool rmb)
{
    foreach (Cervisia::LogInfo *logInfo, items)
        if (logInfo->m_revision == rev) {
            if (rmb)
                selectionB = rev;
            else
                selectionA = rev;

            revbox[rmb ? 1 : 0]->setText(rev);
            authorbox[rmb ? 1 : 0]->setText(logInfo->m_author);
            datebox[rmb ? 1 : 0]->setText(logInfo->dateTimeToString());
            commentbox[rmb ? 1 : 0]->setPlainText(logInfo->m_comment);
            tagsbox[rmb ? 1 : 0]->setPlainText(logInfo->tagsToString());

            tree->setSelectedPair(selectionA, selectionB);
            list->setSelectedPair(selectionA, selectionB);

            updateButtons();
            return;
        }
    qCDebug(log_cervisia) << "Internal error: Revision not found " << rev << ".";
}

void LogDialog::tagSelected(LogDialogTagInfo *tag, bool rmb)
{
    if (tag->branchpoint.isEmpty())
        revisionSelected(tag->rev, rmb);
    else
        revisionSelected(tag->branchpoint, rmb);
}

void LogDialog::updateButtons()
{
    // no versions selected?
    if (selectionA.isEmpty() && selectionB.isEmpty()) {
        user1Button->setEnabled(true);
        user2Button->setEnabled(false);
        okButton->setEnabled(false); // view
        buttonBox->button(QDialogButtonBox::Apply)->setEnabled(false); // create patch
    }
    // both versions selected?
    else if (!selectionA.isEmpty() && !selectionB.isEmpty()) {
        user1Button->setEnabled(true);
        user2Button->setEnabled(true);
        okButton->setEnabled(true); // view A
        buttonBox->button(QDialogButtonBox::Apply)->setEnabled(true); // create patch
    }
    // only single version selected?
    else {
        user1Button->setEnabled(true);
        user2Button->setEnabled(true);
        okButton->setEnabled(true); // view
        buttonBox->button(QDialogButtonBox::Apply)->setEnabled(true); // create patch
    }
}

void LogDialog::tagASelected(int n)
{
    if (n)
        tagSelected(tags.at(n - 1), false);
}

void LogDialog::tagBSelected(int n)
{
    if (n)
        tagSelected(tags.at(n - 1), true);
}

void LogDialog::tabChanged(int index)
{
    bool isPlainView = (tabWidget->widget(index) == plain);
    user3Button->setVisible(isPlainView);
}

// Local Variables:
// c-basic-offset: 4
// End:
