/* ============================================================
* QupZilla - WebKit based browser
* Copyright (C) 2010-2014  David Rosca <nowrep@gmail.com>
*
* 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 3 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, see <http://www.gnu.org/licenses/>.
* ============================================================ */
#include "locationbar.h"
#include "browserwindow.h"
#include "tabbedwebview.h"
#include "rssmanager.h"
#include "mainapplication.h"
#include "clickablelabel.h"
#include "webpage.h"
#include "tabwidget.h"
#include "bookmarksicon.h"
#include "progressbar.h"
#include "statusbarmessage.h"
#include "toolbutton.h"
#include "searchenginesmanager.h"
#include "siteicon.h"
#include "goicon.h"
#include "rssicon.h"
#include "downicon.h"
#include "qztools.h"
#include "iconprovider.h"
#include "qzsettings.h"
#include "colors.h"
#include "autofillicon.h"
#include "completer/locationcompleter.h"

#include <QMimeData>
#include <QClipboard>
#include <QTimer>
#include <QContextMenuEvent>
#include <QAction>
#include <QMenu>

LocationBar::LocationBar(BrowserWindow* window)
    : LineEdit(window)
    , m_window(window)
    , m_webView(0)
    , m_pasteAndGoAction(0)
    , m_clearAction(0)
    , m_rssIconVisible(false)
    , m_holdingAlt(false)
    , m_loadProgress(0)
    , m_progressVisible(false)
    , m_forcePaintEvent(false)
    , m_inlineCompletionVisible(false)
    , m_popupClosed(false)
{
    setObjectName("locationbar");
    setDragEnabled(true);

    m_bookmarkIcon = new BookmarksIcon(this);
    m_goIcon = new GoIcon(this);
    m_rssIcon = new RssIcon(this);
    m_siteIcon = new SiteIcon(m_window, this);
    m_autofillIcon = new AutoFillIcon(this);
    DownIcon* down = new DownIcon(this);

    // RTL Support
    // if we don't add 'm_siteIcon' by following code, then we should use suitable padding-left value
    // but then, when typing RTL text the layout dynamically changed and within RTL layout direction
    // padding-left is equivalent to padding-right and vice versa, and because style sheet is
    // not changed dynamically this create padding problems.
    addWidget(m_siteIcon, LineEdit::LeftSide);

    addWidget(m_autofillIcon, LineEdit::RightSide);
    addWidget(m_bookmarkIcon, LineEdit::RightSide);
    addWidget(m_rssIcon, LineEdit::RightSide);
    addWidget(m_goIcon, LineEdit::RightSide);
    addWidget(down, LineEdit::RightSide);

    m_completer = new LocationCompleter(this);
    m_completer->setMainWindow(m_window);
    m_completer->setLocationBar(this);
    connect(m_completer, SIGNAL(showCompletion(QString)), this, SLOT(showCompletion(QString)));
    connect(m_completer, SIGNAL(loadCompletion()), this, SLOT(urlEnter()));
    connect(m_completer, SIGNAL(clearCompletion()), this, SLOT(clearCompletion()));
    connect(m_completer, SIGNAL(popupClosed()), this, SLOT(completionPopupClosed()));

    connect(this, SIGNAL(textEdited(QString)), this, SLOT(textEdit()));
    connect(m_goIcon, SIGNAL(clicked(QPoint)), this, SLOT(urlEnter()));
    connect(down, SIGNAL(clicked(QPoint)), m_completer, SLOT(showMostVisited()));
    connect(mApp->searchEnginesManager(), SIGNAL(activeEngineChanged()), this, SLOT(updatePlaceHolderText()));
    connect(mApp->searchEnginesManager(), SIGNAL(defaultEngineChanged()), this, SLOT(updatePlaceHolderText()));
    connect(mApp, SIGNAL(reloadSettings()), SLOT(loadSettings()));

    loadSettings();
    clearIcon();

    // Hide icons by default
    hideGoButton();
    m_rssIcon->hide();
    m_autofillIcon->hide();

    QTimer::singleShot(0, this, SLOT(updatePlaceHolderText()));
}

void LocationBar::setWebView(TabbedWebView* view)
{
    m_webView = view;

    m_bookmarkIcon->setWebView(m_webView);
    m_rssIcon->setWebView(m_webView);
    m_siteIcon->setWebView(m_webView);
    m_autofillIcon->setWebView(m_webView);

    connect(m_webView, SIGNAL(loadStarted()), SLOT(onLoadStarted()));
    connect(m_webView, SIGNAL(loadProgress(int)), SLOT(onLoadProgress(int)));
    connect(m_webView, SIGNAL(loadFinished(bool)), SLOT(onLoadFinished()));
}

void LocationBar::setText(const QString &text)
{
    LineEdit::setText(text);
    m_forcePaintEvent = true;
}

void LocationBar::updatePlaceHolderText()
{
    QString engineName = qzSettings->searchWithDefaultEngine ?
                         mApp->searchEnginesManager()->defaultEngine().name :
                         mApp->searchEnginesManager()->activeEngine().name;
    setPlaceholderText(tr("Enter URL address or search on %1").arg(engineName));
}

void LocationBar::showCompletion(const QString &newText)
{
    m_inlineCompletionVisible = false;

    LineEdit::setText(newText);

    // Move cursor to the end
    end(false);
}

void LocationBar::clearCompletion()
{
    m_webView->setFocus();
    showUrl(m_webView->url());
}

void LocationBar::completionPopupClosed()
{
    m_inlineCompletionVisible = false;
    m_popupClosed = true;
}

QUrl LocationBar::createUrl()
{
    QUrl urlToLoad;

    // Check for Search Engine shortcut
    int firstSpacePos = text().indexOf(QLatin1Char(' '));
    if (firstSpacePos != -1) {
        QString shortcut = text().left(firstSpacePos);
        QString searchedString = QUrl::toPercentEncoding(text().mid(firstSpacePos).trimmed());

        SearchEngine en = mApp->searchEnginesManager()->engineForShortcut(shortcut);
        if (!en.name.isEmpty()) {
            urlToLoad = QUrl::fromEncoded(en.url.replace(QLatin1String("%s"), searchedString).toUtf8());
        }
    }

    if (isInlineCompletionVisible()) {
        urlToLoad = WebView::guessUrlFromString(text() + m_completer->domainCompletion());
    }

    if (urlToLoad.isEmpty()) {
        QUrl guessedUrl = WebView::guessUrlFromString(text());
        if (!guessedUrl.isEmpty()) {
            urlToLoad = guessedUrl;
        }
        else {
            urlToLoad = QUrl::fromEncoded(text().toUtf8());
        }
    }

    return urlToLoad;
}

QString LocationBar::convertUrlToText(const QUrl &url) const
{
    // It was most probably entered by user, so don't urlencode it
    if (url.scheme().isEmpty()) {
        return url.toString();
    }

    QString stringUrl = QzTools::urlEncodeQueryString(url);

    if (stringUrl == QLatin1String("qupzilla:speeddial") || stringUrl == QLatin1String("about:blank")) {
        stringUrl.clear();
    }

    return stringUrl;
}

bool LocationBar::isInlineCompletionVisible() const
{
    return m_inlineCompletionVisible && !m_completer->domainCompletion().isEmpty();
}

void LocationBar::urlEnter()
{
    const QUrl url = createUrl();
    const QString urlString = convertUrlToText(url);

    m_completer->closePopup();
    m_webView->setFocus();

    if (urlString != text()) {
        setText(convertUrlToText(url));
    }

    emit loadUrl(url);
}

void LocationBar::textEdit()
{
    if (!text().isEmpty()) {
        m_completer->complete(text());
        m_inlineCompletionVisible = true;
    }
    else {
        m_completer->closePopup();
    }

    showGoButton();
}

void LocationBar::showGoButton()
{
    m_rssIconVisible = m_rssIcon->isVisible();

    m_bookmarkIcon->hide();
    m_rssIcon->hide();
    m_goIcon->show();

    updateTextMargins();
}

void LocationBar::hideGoButton()
{
    m_rssIcon->setVisible(m_rssIconVisible);
    m_bookmarkIcon->show();

    if (!qzSettings->alwaysShowGoIcon) {
        m_goIcon->hide();
    }

    updateTextMargins();
}

void LocationBar::showRSSIcon(bool state)
{
    m_rssIcon->setVisible(state);

    updateTextMargins();
}

void LocationBar::showUrl(const QUrl &url)
{
    if (hasFocus() || url.isEmpty()) {
        return;
    }

    const QString stringUrl = convertUrlToText(url);

    if (stringUrl == text()) {
        return;
    }

    setText(stringUrl);

    hideGoButton();
    m_bookmarkIcon->checkBookmark(url);
}

void LocationBar::siteIconChanged()
{
    QIcon icon_ = m_webView->icon();

    if (icon_.isNull()) {
        clearIcon();
    }
    else {
        m_siteIcon->setIcon(QIcon(icon_.pixmap(16, 16)));
    }
}

void LocationBar::clearIcon()
{
    m_siteIcon->setIcon(IconProvider::emptyWebIcon());
}

void LocationBar::setPrivacy(bool state)
{
    m_siteIcon->setProperty("secured", QVariant(state));
    m_siteIcon->style()->unpolish(m_siteIcon);
    m_siteIcon->style()->polish(m_siteIcon);

    setProperty("secured", QVariant(state));
    style()->unpolish(this);
    style()->polish(this);
}

void LocationBar::pasteAndGo()
{
    clear();
    paste();
    urlEnter();
}

void LocationBar::contextMenuEvent(QContextMenuEvent* event)
{
    Q_UNUSED(event)

    if (!m_pasteAndGoAction) {
        m_pasteAndGoAction = new QAction(QIcon::fromTheme("edit-paste"), tr("Paste And &Go"), this);
        m_pasteAndGoAction->setShortcut(QKeySequence("Ctrl+Shift+V"));
        connect(m_pasteAndGoAction, SIGNAL(triggered()), this, SLOT(pasteAndGo()));
    }

    if (!m_clearAction) {
        m_clearAction = new QAction(QIcon::fromTheme("edit-clear"), tr("Clear All"), this);
        connect(m_clearAction, SIGNAL(triggered()), this, SLOT(clear()));
    }

    QMenu* tempMenu = createStandardContextMenu();
    QMenu menu(this);

    int i = 0;
    foreach (QAction* act, tempMenu->actions()) {
        menu.addAction(act);

        switch (i) {
        case 0:
            act->setIcon(QIcon::fromTheme("edit-undo"));
            break;
        case 1:
            act->setIcon(QIcon::fromTheme("edit-redo"));
            break;
        case 3:
            act->setIcon(QIcon::fromTheme("edit-cut"));
            break;
        case 4:
            act->setIcon(QIcon::fromTheme("edit-copy"));
            break;
        case 5:
            act->setIcon(QIcon::fromTheme("edit-paste"));
            menu.addAction(act);
            menu.addAction(m_pasteAndGoAction);
            break;
        case 6:
            act->setIcon(QIcon::fromTheme("edit-delete"));
            menu.addAction(act);
            menu.addAction(m_clearAction);
            break;
        case 8:
            act->setIcon(QIcon::fromTheme("edit-select-all"));
            break;
        }
        ++i;
    }

    m_pasteAndGoAction->setEnabled(!QApplication::clipboard()->text().isEmpty());

    // Prevent choosing first option with double rightclick
    QPoint pos = event->globalPos();
    QPoint p(pos.x(), pos.y() + 1);
    menu.exec(p);

    tempMenu->deleteLater();
}

void LocationBar::focusInEvent(QFocusEvent* event)
{
    if (m_webView) {
        const QString stringUrl = convertUrlToText(m_webView->url());

        // Text has been edited, let's show go button
        if (stringUrl != text()) {
            showGoButton();
        }
    }

    LineEdit::focusInEvent(event);
}

void LocationBar::dropEvent(QDropEvent* event)
{
    if (event->mimeData()->hasUrls()) {
        QUrl dropUrl = event->mimeData()->urls().at(0);
        if (WebView::isUrlValid(dropUrl)) {
            setText(dropUrl.toString());

            m_webView->setFocus();
            emit loadUrl(dropUrl);

            QFocusEvent event(QFocusEvent::FocusOut);
            LineEdit::focusOutEvent(&event);
            return;
        }
    }
    else if (event->mimeData()->hasText()) {
        QUrl dropUrl = QUrl(event->mimeData()->text().trimmed());
        if (WebView::isUrlValid(dropUrl)) {
            setText(dropUrl.toString());

            m_webView->setFocus();
            emit loadUrl(dropUrl);

            QFocusEvent event(QFocusEvent::FocusOut);
            LineEdit::focusOutEvent(&event);
            return;
        }

    }

    LineEdit::dropEvent(event);
}

void LocationBar::focusOutEvent(QFocusEvent* event)
{
    LineEdit::focusOutEvent(event);

    if (event->reason() == Qt::PopupFocusReason
            || (!selectedText().isEmpty() && event->reason() != Qt::TabFocusReason)) {
        return;
    }

    m_popupClosed = false;
    m_forcePaintEvent = true;
    hideGoButton();

    if (text().trimmed().isEmpty()) {
        clear();
    }
}

void LocationBar::keyPressEvent(QKeyEvent* event)
{
    switch (event->key()) {
    case Qt::Key_V:
        if (event->modifiers() == (Qt::ControlModifier | Qt::ShiftModifier)) {
            pasteAndGo();
            event->accept();
            return;
        }
        break;

    case Qt::Key_A:
        if (event->modifiers() == Qt::ControlModifier && m_inlineCompletionVisible) {
            m_inlineCompletionVisible = false;
        }
        break;

    case Qt::Key_Down:
        m_completer->complete(text());
        break;

    case Qt::Key_End:
    case Qt::Key_Right: {
        const QString completionText = m_completer->domainCompletion();
        if (m_inlineCompletionVisible && !completionText.isEmpty()) {
            m_inlineCompletionVisible = false;

            setText(text() + completionText);
            setCursorPosition(text().size());
            m_completer->closePopup();
        }

        if (m_completer->isPopupVisible()) {
            m_completer->closePopup();
        }
        break;
    }

    case Qt::Key_Left:
        if (m_completer->isPopupVisible()) {
            m_completer->closePopup();
        }
        break;

    case Qt::Key_Delete:
        if (m_inlineCompletionVisible) {
            m_inlineCompletionVisible = false;

            update();
            event->accept();
        }
        break;

    case Qt::Key_Escape:
        m_webView->setFocus();
        showUrl(m_webView->url());
        event->accept();
        break;

    case Qt::Key_Alt:
        m_holdingAlt = true;
        break;

    case Qt::Key_Return:
    case Qt::Key_Enter:
        switch (event->modifiers()) {
        case Qt::ControlModifier:
            setText(text().append(QLatin1String(".com")));
            urlEnter();
            m_holdingAlt = false;
            break;

        case Qt::AltModifier:
            m_completer->closePopup();
            m_window->tabWidget()->addView(createUrl());
            m_holdingAlt = false;
            break;

        default:
            urlEnter();
            m_holdingAlt = false;
        }

        break;

    case Qt::Key_0:
    case Qt::Key_1:
    case Qt::Key_2:
    case Qt::Key_3:
    case Qt::Key_4:
    case Qt::Key_5:
    case Qt::Key_6:
    case Qt::Key_7:
    case Qt::Key_8:
    case Qt::Key_9:
        if (event->modifiers() & Qt::AltModifier || event->modifiers() & Qt::ControlModifier) {
            event->ignore();
            m_holdingAlt = false;
            return;
        }
        break;

    default:
        m_holdingAlt = false;
    }

    LineEdit::keyPressEvent(event);
}

void LocationBar::keyReleaseEvent(QKeyEvent* event)
{
    QString localDomain = tr(".co.uk", "Append domain name on ALT + Enter = Should be different for every country");

    if (event->key() == Qt::Key_Alt && m_holdingAlt && qzSettings->addCountryWithAlt &&
            !text().endsWith(localDomain) && !text().endsWith(QLatin1Char('/'))) {
        LineEdit::setText(text().append(localDomain));
    }

    LineEdit::keyReleaseEvent(event);
}

void LocationBar::onLoadStarted()
{
    m_progressVisible = true;
    m_autofillIcon->hide();
}

void LocationBar::onLoadProgress(int progress)
{
    if (qzSettings->showLoadingProgress) {
        m_loadProgress = progress;
        update();
    }
}

void LocationBar::onLoadFinished()
{
    if (qzSettings->showLoadingProgress) {
        QTimer::singleShot(700, this, SLOT(hideProgress()));
    }

    WebPage* page = qobject_cast<WebPage*>(m_webView->page());

    if (page && page->hasMultipleUsernames()) {
        m_autofillIcon->setFormData(page->autoFillData());
        m_autofillIcon->show();
    }
}

void LocationBar::loadSettings()
{
    Settings settings;
    settings.beginGroup("AddressBar");
    m_progressStyle = static_cast<ProgressStyle>(settings.value("ProgressStyle", 0).toInt());
    bool customColor = settings.value("UseCustomProgressColor", false).toBool();
    m_progressColor = customColor ? settings.value("CustomProgressColor", palette().color(QPalette::Highlight)).value<QColor>() : QColor();
    settings.endGroup();
}

void LocationBar::hideProgress()
{
    if (qzSettings->showLoadingProgress && m_loadProgress == 100) {
        m_progressVisible = false;
        update();
    }
}

void LocationBar::paintEvent(QPaintEvent* event)
{
    QStyleOptionFrameV3 option;
    initStyleOption(&option);

    int lm, tm, rm, bm;
    getTextMargins(&lm, &tm, &rm, &bm);

    QRect contentsRect = style()->subElementRect(QStyle::SE_LineEditContents, &option, this);
    contentsRect.adjust(lm, tm, -rm, -bm);

    const QFontMetrics fm = fontMetrics();
    const int x = contentsRect.x() + 4;
    const int y = contentsRect.y() + (contentsRect.height() - fm.height() + 1) / 2;
    const int width = contentsRect.width() - 6;
    const int height = fm.height();
    const QRect textRect(x, y, width, height);

    QTextOption opt;
    opt.setWrapMode(QTextOption::NoWrap);

    QPainter p(this);
    p.setRenderHint(QPainter::Antialiasing, true);
    p.setRenderHint(QPainter::TextAntialiasing, true);

    if (hasFocus() && m_inlineCompletionVisible) {
        // Draw inline domain completion if available
        const QString completionText = m_completer->domainCompletion();

        if (!completionText.isEmpty()) {
            QRect completionRect = textRect;
            completionRect.setX(completionRect.x() + fm.width(text()) + 1);
            completionRect.setWidth(fm.width(completionText) + 1);

            style()->drawPrimitive(QStyle::PE_PanelLineEdit, &option, &p, this);
            // Text part
            p.drawText(textRect, text(), opt);
            // Completion part
            p.fillRect(completionRect, palette().color(QPalette::Highlight));
            p.setPen(palette().color(QPalette::HighlightedText));
            p.drawText(completionRect, completionText, opt);
            return;
        }
    }

    if (m_completer->isPopupVisible() && !m_completer->isShowingMostVisited()) {
        // We need to draw cursor when popup is visible
        // But don't paint it if we are just showing most visited sites
        const int cursorWidth = style()->pixelMetric(QStyle::PM_TextCursorWidth, &option, this);
        const int cursorHeight = fm.height();

        QString textPart = text().left(cursorPosition());
        int cursorXpos = x + fontMetrics().width(textPart);

        QRect cursor = cursorRect();
        cursor.setX(cursorXpos + 1);
        cursor.setWidth(cursorWidth);
        cursor.setHeight(cursorHeight);

        style()->drawPrimitive(QStyle::PE_PanelLineEdit, &option, &p, this);

        QRect actualTextRect = textRect;
        actualTextRect.setWidth(fontMetrics().width(text()) + 1);

        // When popup is visible, Ctrl + A (Select All) is the only way to select text
        if (selectedText() == text()) {
            p.fillRect(actualTextRect, palette().color(QPalette::Highlight));
            p.setPen(palette().color(QPalette::HighlightedText));
        }

        p.drawText(actualTextRect, text(), opt);

        if (textRect.contains(cursor.center().x(), cursor.center().y())) {
            p.fillRect(cursor, option.palette.text().color());
        }
        return;
    }

    if (hasFocus() || text().isEmpty() || m_forcePaintEvent) {
        LineEdit::paintEvent(event);
        if (m_forcePaintEvent) {
            m_forcePaintEvent = false;
            update();
        }
        return;
    }

    style()->drawPrimitive(QStyle::PE_PanelLineEdit, &option, &p, this);

    QPen oldPen = p.pen();

    if (qzSettings->showLoadingProgress && m_progressVisible) {
        QColor bg = m_progressColor;
        if (!bg.isValid() || bg.alpha() == 0) {
            bg = Colors::mid(palette().color(QPalette::Base),
                             palette().color(QPalette::Text),
                             m_progressStyle > 0 ? 4 : 8, 1);
        }
        p.setBrush(QBrush(bg));

        QPen outlinePen(bg.darker(110), 0.8);
        p.setPen(outlinePen);

        switch (m_progressStyle) {
        case ProgressFilled: {
            QRect bar = contentsRect.adjusted(0, 1, 0, -1);
            bar.setWidth(bar.width() * m_loadProgress / 100);
            const int roundness = bar.height() / 4.0;
            p.drawRoundedRect(bar, roundness, roundness);
            break;
        }
        case ProgressBottom: {
            outlinePen.setWidthF(0.3);
            outlinePen.setColor(outlinePen.color().darker(130));
            p.setPen(outlinePen);
            QRect bar(contentsRect.x(), contentsRect.bottom() - 3,
                      contentsRect.width() * m_loadProgress / 100.0, 3);
            p.drawRoundedRect(bar, 1, 1);
            break;
        }
        case ProgressTop: {
            outlinePen.setWidthF(0.3);
            outlinePen.setColor(outlinePen.color().darker(130));
            p.setPen(outlinePen);
            QRect bar(contentsRect.x(), contentsRect.top() + 1,
                      contentsRect.width() * m_loadProgress / 100.0, 3);
            p.drawRoundedRect(bar, 1, 1);
            break;
        }
        default:
            break;
        }
    }

    p.setPen(oldPen);

    const QString hostName = m_webView->url().host();
    QString currentText = text();
    QRect currentRect = textRect;
    if (!hostName.isEmpty()) {
        const int hostPos = currentText.indexOf(hostName);
        if (hostPos > 0) {
            QPen lightPen = oldPen;
            QColor lightColor = Colors::mid(palette().color(QPalette::Base),
                                            palette().color(QPalette::Text),
                                            1, 1);
            lightPen.setColor(lightColor);

            p.setPen(lightPen);
            currentText = text().mid(0, hostPos);
            currentRect.setWidth(fm.width(currentText));
            p.drawText(currentRect, currentText, opt);

            p.setPen(oldPen);
            currentRect.setX(currentRect.x() + currentRect.width());
            const int hostWidth = fm.width(hostName);
            currentRect.setWidth(hostWidth);
            p.drawText(currentRect, hostName, opt);

            p.setFont(font());
            currentText = text().mid(hostPos + hostName.length());
            currentRect.setX(currentRect.x() + hostWidth);
            currentRect.setWidth(textRect.width() - currentRect.x() + textRect.x());
            p.setPen(lightPen);

            if (currentText.isRightToLeft()) {
                // Insert unicode control characters: prepend LRE then append LRM+PDF
                currentText.prepend(QChar(0x202A)).append(QChar(0x200E)).append(QChar(0x202C));
            }
        }
    }

    p.drawText(currentRect, currentText, opt);
}

LocationBar::~LocationBar()
{
}