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/*
 * Copyright (c) 2012-2013 Catalin Badea
 * Licensed under the simplified BSD license.
 * See Documentation/Licenses/BSD-simplified.txt for more information.
 */

/*
 * Copyright (c) 2013-2016 Isode Limited.
 * All rights reserved.
 * See the COPYING file for more information.
 */

#include <Swift/QtUI/QtHistoryWindow.h>

#include <memory>
#include <string>

#include <boost/date_time/gregorian/gregorian.hpp>
#include <boost/numeric/conversion/cast.hpp>

#include <QDateTime>
#include <QLineEdit>
#include <QMenu>
#include <QTextDocument>
#include <QTime>
#include <QUrl>

#include <Swiften/History/HistoryMessage.h>

#include <Swift/Controllers/Settings/SettingsProvider.h>
#include <Swift/Controllers/UIEvents/UIEventStream.h>

#include <Swift/QtUI/ChatSnippet.h>
#include <Swift/QtUI/MessageSnippet.h>
#include <Swift/QtUI/QtScaledAvatarCache.h>
#include <Swift/QtUI/QtSwiftUtil.h>
#include <Swift/QtUI/QtUtilities.h>
#include <Swift/QtUI/QtWebKitChatView.h>
#include <Swift/QtUI/Roster/QtTreeWidget.h>

namespace Swift {

QtHistoryWindow::QtHistoryWindow(SettingsProvider* settings, UIEventStream* eventStream) :
        previousTopMessageWasSelf_(false),
        previousBottomMessageWasSelf_(false) {
    ui_.setupUi(this);

    theme_ = new QtChatTheme("");
    idCounter_ = 0;

    delete ui_.conversation_;
    conversation_ = new QtWebKitChatView(nullptr, nullptr, theme_, this, settings, true); // Horrible unsafe. Do not do this. FIXME
    QSizePolicy sizePolicy(QSizePolicy::Expanding, QSizePolicy::Preferred);
    sizePolicy.setHorizontalStretch(80);
    sizePolicy.setVerticalStretch(0);
    conversation_->setSizePolicy(sizePolicy);

    ui_.conversation_ = conversation_;
    ui_.bottomLayout_->addWidget(conversation_);

    delete ui_.conversationRoster_;
    conversationRoster_ = new QtTreeWidget(eventStream, settings, QtTreeWidget::MessageDefaultJID, this);
    QSizePolicy sizePolicy2(QSizePolicy::Preferred, QSizePolicy::Expanding);
    sizePolicy2.setVerticalStretch(80);
    conversationRoster_->setSizePolicy(sizePolicy2);
    ui_.conversationRoster_ = conversationRoster_;
    ui_.bottomLeftLayout_->setDirection(QBoxLayout::BottomToTop);
    ui_.bottomLeftLayout_->addWidget(conversationRoster_);

    setWindowTitle(tr("History"));

    conversationRoster_->onSomethingSelectedChanged.connect(boost::bind(&QtHistoryWindow::handleSomethingSelectedChanged, this, _1));
    connect(conversation_, SIGNAL(scrollRequested(int)), this, SLOT(handleScrollRequested(int)));
    connect(conversation_, SIGNAL(scrollReachedTop()), this, SLOT(handleScrollReachedTop()));
    connect(conversation_, SIGNAL(scrollReachedBottom()), this, SLOT(handleScrollReachedBottom()));
    connect(conversation_, SIGNAL(fontResized(int)), this, SLOT(handleFontResized(int)));
    connect(ui_.searchBox_->lineEdit(), SIGNAL(returnPressed()), this, SLOT(handleReturnPressed()));
    connect(ui_.calendarWidget_, SIGNAL(clicked(const QDate&)), this, SLOT(handleCalendarClicked(const QDate&)));
    connect(ui_.calendarWidget_, SIGNAL(activated(const QDate&)), this, SLOT(handleCalendarClicked(const QDate&)));
    connect(ui_.previousButton_, SIGNAL(clicked(bool)), this, SLOT(handlePreviousButtonClicked()));
    connect(ui_.nextButton_, SIGNAL(clicked(bool)), this, SLOT(handleNextButtonClicked()));
}

QtHistoryWindow::~QtHistoryWindow() {
    disconnect(conversation_, SIGNAL(scrollRequested(int)), this, SLOT(handleScrollRequested(int)));
    disconnect(conversation_, SIGNAL(scrollReachedTop()), this, SLOT(handleScrollReachedTop()));
    disconnect(conversation_, SIGNAL(scrollReachedBottom()), this, SLOT(handleScrollReachedBottom()));
    disconnect(conversation_, SIGNAL(fontResized(int)), this, SLOT(handleFontResized(int)));
    disconnect(ui_.searchBox_->lineEdit(), SIGNAL(returnPressed()), this, SLOT(handleReturnPressed()));
    disconnect(ui_.calendarWidget_, SIGNAL(clicked(const QDate&)), this, SLOT(handleCalendarClicked(const QDate&)));
    disconnect(ui_.calendarWidget_, SIGNAL(activated(const QDate&)), this, SLOT(handleCalendarClicked(const QDate&)));
    disconnect(ui_.previousButton_, SIGNAL(clicked(bool)), this, SLOT(handlePreviousButtonClicked()));
    disconnect(ui_.nextButton_, SIGNAL(clicked(bool)), this, SLOT(handleNextButtonClicked()));

    delete theme_;
    delete conversation_;
    // TODO: delete ui_
}

void QtHistoryWindow::activate() {
    emit wantsToActivate();
}

void QtHistoryWindow::showEvent(QShowEvent* event) {
    emit windowOpening();
    emit titleUpdated();
    QWidget::showEvent(event);
}

void QtHistoryWindow::closeEvent(QCloseEvent* event) {
    emit windowClosing();
    event->accept();
}

void QtHistoryWindow::setRosterModel(Roster* model) {
    conversationRoster_->setRosterModel(model);
}

void QtHistoryWindow::addMessage(const std::string &message, const std::string &senderName, bool senderIsSelf, const std::string& avatarPath, const boost::posix_time::ptime& time, bool addAtTheTop) {
    QString scaledAvatarPath = QtScaledAvatarCache(32).getScaledAvatarPath(avatarPath.c_str());

    QString messageHTML(P2QSTRING(message));
    messageHTML = QtUtilities::htmlEscape(messageHTML);
    QString searchTerm = ui_.searchBox_->lineEdit()->text();
    if (searchTerm.length()) {
        messageHTML.replace(searchTerm, "<span style='background-color: yellow'>" + searchTerm + "</span>");
    }

    // note: time uses localtime
    QDate date = QDate(time.date().year(), time.date().month(), time.date().day());
    QTime dayTime = QTime(time.time_of_day().hours(), time.time_of_day().minutes(), time.time_of_day().seconds());
    QDateTime qTime = QDateTime(date, dayTime);

    std::string id = "id" + boost::lexical_cast<std::string>(idCounter_++);

    QString qAvatarPath =  scaledAvatarPath.isEmpty() ? "qrc:/icons/avatar.png" : QUrl::fromLocalFile(scaledAvatarPath).toEncoded();

    if (addAtTheTop) {
        bool appendToPrevious = ((senderIsSelf && previousTopMessageWasSelf_) || (!senderIsSelf && !previousTopMessageWasSelf_&& previousTopSenderName_ == P2QSTRING(senderName)));
        conversation_->addMessageTop(std::make_shared<MessageSnippet>(messageHTML, QtUtilities::htmlEscape(P2QSTRING(senderName)), qTime, qAvatarPath, senderIsSelf, appendToPrevious, theme_, P2QSTRING(id), ChatSnippet::getDirection(message)));

        previousTopMessageWasSelf_ = senderIsSelf;
        previousTopSenderName_ = P2QSTRING(senderName);
    }
    else {
        bool appendToPrevious = ((senderIsSelf && previousBottomMessageWasSelf_) || (!senderIsSelf && !previousBottomMessageWasSelf_&& previousBottomSenderName_ == P2QSTRING(senderName)));
        conversation_->addMessageBottom(std::make_shared<MessageSnippet>(messageHTML, QtUtilities::htmlEscape(P2QSTRING(senderName)), qTime, qAvatarPath, senderIsSelf, appendToPrevious, theme_, P2QSTRING(id), ChatSnippet::getDirection(message)));
        previousBottomMessageWasSelf_ = senderIsSelf;
        previousBottomSenderName_ = P2QSTRING(senderName);
    }

    // keep track of the days viewable in the chatView
    if (!dates_.count(date)) {
        dates_.insert(date);
    }
}

void QtHistoryWindow::handleSomethingSelectedChanged(RosterItem* item) {
    onSelectedContactChanged(item);
}

void QtHistoryWindow::resetConversationView() {
    previousTopMessageWasSelf_ = false;
    previousBottomMessageWasSelf_ = false;
    previousTopSenderName_.clear();
    previousBottomSenderName_.clear();

    dates_.clear();
    conversation_->resetView();
}

void QtHistoryWindow::handleScrollRequested(int pos) {
    // first message starts with offset 5
    if (pos < 5) {
        pos = 5;
    }

    QDate currentDate;
    for (const auto& date : dates_) {
        int snippetPosition = conversation_->getSnippetPositionByDate(date);
        if (snippetPosition <= pos) {
            currentDate = date;
        }
    }

    if (ui_.calendarWidget_->selectedDate() != currentDate) {
        ui_.calendarWidget_->setSelectedDate(currentDate);
    }
}

void QtHistoryWindow::handleScrollReachedTop() {
    if (dates_.empty()) {
        return;
    }

    int year, month, day;
    QDate firstDate = *dates_.begin();
    firstDate.getDate(&year, &month, &day);
    onScrollReachedTop(boost::gregorian::date(boost::numeric_cast<unsigned short>(year), boost::numeric_cast<unsigned short>(month), boost::numeric_cast<unsigned short>(day)));
}

void QtHistoryWindow::handleScrollReachedBottom() {
    if (dates_.empty()) {
        return;
    }

    int year, month, day;
    QDate lastDate = *dates_.rbegin();
    lastDate.getDate(&year, &month, &day);
    onScrollReachedBottom(boost::gregorian::date(boost::numeric_cast<unsigned short>(year), boost::numeric_cast<unsigned short>(month), boost::numeric_cast<unsigned short>(day)));
}

void QtHistoryWindow::handleReturnPressed() {
    onReturnPressed(ui_.searchBox_->lineEdit()->text().toStdString());
}

void QtHistoryWindow::handleCalendarClicked(const QDate& date) {
    int year, month, day;
    QDate tempDate = date; // getDate discards const qualifier
    tempDate.getDate(&year, &month, &day);
    onCalendarClicked(boost::gregorian::date(boost::numeric_cast<unsigned short>(year), boost::numeric_cast<unsigned short>(month), boost::numeric_cast<unsigned short>(day)));
}

void QtHistoryWindow::setDate(const boost::gregorian::date& date) {
    ui_.calendarWidget_->setSelectedDate(QDate::fromJulianDay(date.julian_day()));
}

void QtHistoryWindow::handleNextButtonClicked() {
    onNextButtonClicked();
}

void QtHistoryWindow::handlePreviousButtonClicked() {
    onPreviousButtonClicked();
}

void QtHistoryWindow::handleFontResized(int fontSizeSteps) {
    conversation_->resizeFont(fontSizeSteps);

    emit fontResized(fontSizeSteps);
}

void QtHistoryWindow::resetConversationViewTopInsertPoint() {
    previousTopMessageWasSelf_ = false;
    previousTopSenderName_ = QString();
    conversation_->resetTopInsertPoint();
}

std::string QtHistoryWindow::getSearchBoxText() {
    return ui_.searchBox_->lineEdit()->text().toStdString();
}

boost::gregorian::date QtHistoryWindow::getLastVisibleDate() {
    if (!dates_.empty()) {
        QDate lastDate = *dates_.rbegin();
        int year, month, day;
        lastDate.getDate(&year, &month, &day);

        return boost::gregorian::date(boost::numeric_cast<unsigned short>(year), boost::numeric_cast<unsigned short>(month), boost::numeric_cast<unsigned short>(day));
    }
    return boost::gregorian::date(boost::gregorian::not_a_date_time);
}

std::string QtHistoryWindow::getID() const {
    return "QtHistoryWindow";
}

}