/*
 * Copyright (C) 2020-2022 Roy Qu (royqh1979@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 <https://www.gnu.org/licenses/>.
 */
#include "editorcolorschemewidget.h"
#include "ui_editorcolorschemewidget.h"
#include "../settings.h"
#include "../colorscheme.h"
#include "../mainwindow.h"

#include <QAction>
#include <QMessageBox>
#include <QDebug>
#include <QInputDialog>
#include <QFileDialog>
#include <qsynedit/document.h>

EditorColorSchemeWidget::EditorColorSchemeWidget(const QString& name, const QString& group, QWidget *parent) :
    SettingsWidget(name,group,parent),
    ui(new Ui::EditorColorSchemeWidget)
{
    ui->setupUi(this);
    mStatementColors = std::make_shared<QHash<StatementKind, std::shared_ptr<ColorSchemeItem> >>();

    mItemDelegate = new ColorSchemeItemDelegate(this);
    ui->cbScheme->setItemDelegate(mItemDelegate);

    mDefaultSchemeComboFont = ui->cbScheme->font();
    mModifiedSchemeComboFont = mDefaultSchemeComboFont;
    mModifiedSchemeComboFont.setBold(true);
    int schemeCount=0;
    for (QString schemeName: pColorManager->getSchemes()) {
        PColorScheme scheme = pColorManager->get(schemeName);
        if (!scheme)
            return;
        ui->cbScheme->addItem(schemeName);
        if (scheme->customed())
            ui->cbScheme->setItemData(schemeCount,mModifiedSchemeComboFont,Qt::FontRole);
        else
            ui->cbScheme->setItemData(schemeCount,mDefaultSchemeComboFont,Qt::FontRole);
        schemeCount++;
    }
    QItemSelectionModel *m = ui->treeItems->selectionModel();
    ui->treeItems->setModel(&mDefinesModel);
    delete m;
    mDefinesModel.setHorizontalHeaderLabels(QStringList());        
    for (QString defineName : pColorManager->getDefines()) {
        addDefine(defineName, pColorManager->getDefine(defineName));
    }
    ui->treeItems->expandAll();
    QModelIndex groupIndex = mDefinesModel.index(0,0);
    QModelIndex index = mDefinesModel.index(0,0,groupIndex);
    ui->treeItems->setCurrentIndex(index);
    connect(ui->treeItems->selectionModel(), &QItemSelectionModel::selectionChanged,
            this, &EditorColorSchemeWidget::onItemSelectionChanged);
    connect(ui->cbScheme, QOverload<int>::of(&QComboBox::currentIndexChanged),
            this, &EditorColorSchemeWidget::changeSchemeComboFont);
    connect(ui->cbScheme, QOverload<int>::of(&QComboBox::currentIndexChanged),
            this, &EditorColorSchemeWidget::onItemSelectionChanged);
    connect(this, &SettingsWidget::settingsChanged,this,
            &EditorColorSchemeWidget::onSettingChanged);
    ui->editDemo->setUseCodeFolding(true);
    ui->editDemo->document()->setText(
            "#include <iostream>\n"
            "#include <conio.h>\n"
            "\n"
            "int x=10;\n"
            "\n"
            "int main(int argc, char **argv)\n"
            "{\n"
            "    int numbers[20]; // warning line\n"
            "    float average, total; // bookmark\n"
            "    for (int i = 0; i <= 19; i++) // active breakpoint\n"
            "    { // breakpoint\n"
            "        numbers[i] = i+x;\n"
            "        Total += i; // error line\n"
            "    }\n"
            "    average = total / 20; // comment\n"
            "    std::cout << \"total: \" << total <<\n"
            "    \"\\nAverage: \" << average;\n"
            "    getch();\n"
            "}\n"
                );
    ui->editDemo->setReadOnly(true);
    ui->editDemo->toggleBreakpoint(11);
    ui->editDemo->toggleBookmark(9);
    ui->editDemo->addSyntaxIssues(13, 9, 14, CompileIssueType::Error, "[Error] 'Total' was not declared in this scope; did you mean 'total'?");
    ui->editDemo->addSyntaxIssues(8, 9, 16, CompileIssueType::Warning, "[Warning] variable 'numbers' set but not used [-Wunused-but-set-variable]");
    ui->editDemo->setCaretY(9);
    ui->editDemo->setActiveBreakpointFocus(10,false);
    ui->editDemo->reparseDocument();
    ui->editDemo->invalidate();
    onItemSelectionChanged();
}

void EditorColorSchemeWidget::addDefine(const QString& name, PColorSchemeItemDefine define)
{
    QList<QStandardItem*> items = mDefinesModel.findItems(define->group());
    QStandardItem* pGroupItem;
    if (items.count() == 0 ) {
        //delete in the destructor
        pGroupItem = new QStandardItem(define->group());
        pGroupItem->setData("", NameRole);
        mDefinesModel.appendRow(pGroupItem);
    } else {
        pGroupItem = items[0];
    }
    //delete in the destructor
    QStandardItem* pWidgetItem = new QStandardItem(define->displayName());
    pWidgetItem->setData(name, NameRole);
    pGroupItem->appendRow(pWidgetItem);
}

PColorSchemeItem EditorColorSchemeWidget::getCurrentItem()
{
    QItemSelectionModel * selectionModel = ui->treeItems->selectionModel();
    QString name =mDefinesModel.data(selectionModel->currentIndex(),NameRole).toString();
    if (name.isEmpty())
        return PColorSchemeItem();
    return pColorManager->getItem(ui->cbScheme->currentText(), name);
}

PColorScheme EditorColorSchemeWidget::getCurrentScheme()
{
    return pColorManager->get(ui->cbScheme->currentText());
}

void EditorColorSchemeWidget::connectModificationSlots()
{
    connect(ui->cbBackground,&QCheckBox::stateChanged,
            this, &EditorColorSchemeWidget::onBackgroundChanged);
    connect(ui->colorBackground,&ColorEdit::colorChanged,
            this, &EditorColorSchemeWidget::onBackgroundChanged);
    connect(ui->cbForeground,&QCheckBox::stateChanged,
            this, &EditorColorSchemeWidget::onForegroundChanged);
    connect(ui->colorForeground,&ColorEdit::colorChanged,
            this, &EditorColorSchemeWidget::onForegroundChanged);
    connect(ui->cbBold,&QCheckBox::stateChanged,
            this, &EditorColorSchemeWidget::onFontStyleChanged);
    connect(ui->cbItalic,&QCheckBox::stateChanged,
            this, &EditorColorSchemeWidget::onFontStyleChanged);
    connect(ui->cbStrikeout,&QCheckBox::stateChanged,
            this, &EditorColorSchemeWidget::onFontStyleChanged);
    connect(ui->cbUnderlined,&QCheckBox::stateChanged,
            this, &EditorColorSchemeWidget::onFontStyleChanged);
}

void EditorColorSchemeWidget::disconnectModificationSlots()
{
    disconnect(ui->cbBackground,&QCheckBox::stateChanged,
            this, &EditorColorSchemeWidget::onBackgroundChanged);
    disconnect(ui->colorBackground,&ColorEdit::colorChanged,
            this, &EditorColorSchemeWidget::onBackgroundChanged);
    disconnect(ui->cbForeground,&QCheckBox::stateChanged,
            this, &EditorColorSchemeWidget::onForegroundChanged);
    disconnect(ui->colorForeground,&ColorEdit::colorChanged,
            this, &EditorColorSchemeWidget::onForegroundChanged);
    disconnect(ui->cbBold,&QCheckBox::stateChanged,
            this, &EditorColorSchemeWidget::onFontStyleChanged);
    disconnect(ui->cbItalic,&QCheckBox::stateChanged,
            this, &EditorColorSchemeWidget::onFontStyleChanged);
    disconnect(ui->cbStrikeout,&QCheckBox::stateChanged,
            this, &EditorColorSchemeWidget::onFontStyleChanged);
    disconnect(ui->cbUnderlined,&QCheckBox::stateChanged,
            this, &EditorColorSchemeWidget::onFontStyleChanged);
}

void EditorColorSchemeWidget::setCurrentSchemeModified()
{
    PColorScheme scheme = getCurrentScheme();
    if (scheme) {
        scheme->setCustomed(true);
    }
//    if (mModifiedSchemes.contains(ui->cbScheme->currentText()))
//        return;
    mModifiedSchemes.insert(ui->cbScheme->currentText());
    ui->cbScheme->setItemData(ui->cbScheme->currentIndex(),
                              mModifiedSchemeComboFont,Qt::FontRole);
    ui->cbScheme->setFont(mModifiedSchemeComboFont);
    //ui->cbScheme->view()->setFont(mDefaultSchemeComboFont);
    //we must reset the editor here, because this slot is processed after the onSettingChanged
    onSettingChanged();
}

EditorColorSchemeWidget::~EditorColorSchemeWidget()
{
    delete ui;
    //mDefinesModel.clear();
}

static void setColorProp(ColorEdit* ce, QCheckBox* cb, const QColor& color) {
    if (color.isValid()) {
        cb->setChecked(true);
        ce->setColor(color);
        ce->setVisible(true);
    } else {
        cb->setChecked(false);
        ce->setVisible(false);
    }
}

void EditorColorSchemeWidget::onItemSelectionChanged()
{
    disconnectModificationSlots();
    QItemSelectionModel * selectionModel = ui->treeItems->selectionModel();
    QString name =mDefinesModel.data(selectionModel->currentIndex(),NameRole).toString();
    bool found = false;
    if (!name.isEmpty()) {
        PColorSchemeItemDefine define = pColorManager->getDefine(name);
        if (define) {
            found = true;
            ui->cbBackground->setEnabled(define->hasBackground());
            ui->colorBackground->setEnabled(define->hasBackground());
            ui->cbForeground->setEnabled(define->hasForeground());
            ui->colorForeground->setEnabled(define->hasForeground());
            ui->grpFontStyles->setEnabled(define->hasFontStyle());
            PColorSchemeItem item = pColorManager->getItem(ui->cbScheme->currentText(), name);
            if (!item) {
                PColorScheme scheme = pColorManager->get(ui->cbScheme->currentText());
                if (scheme) {
                    scheme->addItem(name);
                }
            }
            if (define->hasBackground() && item) {
                setColorProp(ui->colorBackground, ui->cbBackground,item->background());
            } else {
                setColorProp(ui->colorBackground, ui->cbBackground,QColor());
            }
            if (define->hasForeground() && item) {
                setColorProp(ui->colorForeground, ui->cbForeground,item->foreground());
            } else {
                setColorProp(ui->colorForeground, ui->cbForeground,QColor());
            }
            if (define->hasFontStyle() && item) {
                ui->cbBold->setChecked(item->bold());
                ui->cbItalic->setChecked(item->italic());
                ui->cbUnderlined->setChecked(item->underlined());
                ui->cbStrikeout->setChecked(item->strikeout());
            } else {
                ui->cbBold->setChecked(false);
                ui->cbItalic->setChecked(false);
                ui->cbUnderlined->setChecked(false);
                ui->cbStrikeout->setChecked(false);
            }
        }
    }

    ui->widgetSchemeItem->setEnabled(found);
    connectModificationSlots();
}

void EditorColorSchemeWidget::onSettingChanged()
{
    pColorManager->updateStatementColors(mStatementColors,ui->cbScheme->currentText());
    ui->editDemo->applyColorScheme(ui->cbScheme->currentText());
    ui->editDemo->setStatementColors(mStatementColors);
}

void EditorColorSchemeWidget::onForegroundChanged()
{
    PColorSchemeItem item = getCurrentItem();
    if (!item)
        return;
    ui->colorForeground->setVisible(ui->cbForeground->isChecked());
    if (ui->cbForeground->isChecked()) {
        item->setForeground(ui->colorForeground->color());
    } else {
        ui->colorForeground->setColor(QColor());
        item->setForeground(QColor());
    }
    setCurrentSchemeModified();
}

void EditorColorSchemeWidget::onBackgroundChanged()
{
    PColorSchemeItem item = getCurrentItem();
    if (!item)
        return;
    ui->colorBackground->setVisible(ui->cbBackground->isChecked());
    if (ui->cbBackground->isChecked()) {
        item->setBackground(ui->colorBackground->color());
    } else {
        ui->colorBackground->setColor(QColor());
        item->setBackground(QColor());
    }
    setCurrentSchemeModified();
}

void EditorColorSchemeWidget::onFontStyleChanged()
{
    PColorSchemeItem item = getCurrentItem();
    if (!item)
        return;
    item->setBold(ui->cbBold->isChecked());
    item->setItalic(ui->cbItalic->isChecked());
    item->setStrikeout(ui->cbStrikeout->isChecked());
    item->setUnderlined(ui->cbUnderlined->isChecked());
    setCurrentSchemeModified();
}

void EditorColorSchemeWidget::changeSchemeComboFont()
{
    QString name = ui->cbScheme->currentText();
    PColorScheme scheme = pColorManager->get(name);
    if (scheme && scheme->customed()) {
        ui->cbScheme->setFont(mModifiedSchemeComboFont);
    } else {
        ui->cbScheme->setFont(mDefaultSchemeComboFont);
    }
    //ui->cbScheme->view()->setFont(mDefaultSchemeComboFont);
}

void EditorColorSchemeWidget::doLoad()
{
    ui->cbScheme->setCurrentText(pSettings->editor().colorScheme());
    changeSchemeComboFont();
    ui->chkRainborParenthesis->setChecked(pSettings->editor().rainbowParenthesis());
}

void EditorColorSchemeWidget::doSave()
{
    try {
        for (QString name:mModifiedSchemes) {
            pColorManager->saveScheme(name);
        }
        pSettings->editor().setColorScheme(ui->cbScheme->currentText());
        pSettings->editor().setRainbowParenthesis(ui->chkRainborParenthesis->isChecked());
        pSettings->editor().save();
        pMainWindow->updateEditorColorSchemes();
    } catch (FileError e) {
        QMessageBox::critical(this,tr("Error"),e.reason());
    }
}

void EditorColorSchemeWidget::on_actionCopy_Scheme_triggered()
{
    QString newName = pColorManager->copy(ui->cbScheme->currentText());
    if (newName.isEmpty())
        return;
    ui->cbScheme->addItem(newName);
    ui->cbScheme->setCurrentText(newName);
}

void EditorColorSchemeWidget::on_btnSchemeMenu_pressed()
{
    QMenu menu;

    PColorScheme scheme = getCurrentScheme();
    if (scheme) {
        if (scheme->customed()) {
            menu.addAction(ui->actionReset_Scheme);
        }
        if (!scheme->bundled()) {
            menu.addAction(ui->actionRename_Scheme);
            menu.addAction(ui->actionDelete_Scheme);
        }
        QString name = ui->cbScheme->currentText();
        if (!pColorManager->exists(name+ " Copy"))
            menu.addAction(ui->actionCopy_Scheme);
        menu.addAction(ui->actionExport_Scheme);
        menu.addSeparator();
    }
    menu.addAction(ui->actionImport_Scheme);
    QPoint p;
    p.setX(0);
    p.setY(ui->btnSchemeMenu->height()+2);
    menu.exec(ui->btnSchemeMenu->mapToGlobal(p));
}

void EditorColorSchemeWidget::on_actionImport_Scheme_triggered()
{
    QString filename = QFileDialog::getOpenFileName(this,
        tr("Open"), QString(), tr("Color Scheme Files (*.scheme)"));
    if (filename.isEmpty())
        return;
    QFileInfo fileInfo(filename);
    QString name = fileInfo.fileName();
    QString suffix = EXT_COLOR_SCHEME;
    if (!name.toLower().endsWith(suffix))
        return;
    name.remove(name.length()-suffix.length(),suffix.length());
    name.replace('_',' ');
    if (!pColorManager->isValidName(name)) {
        QMessageBox::critical(this,tr("Error"),tr("'%1' is not a valid name for color scheme file."));
        return;
    }
    try {
        PColorScheme scheme = ColorScheme::load(filename);
        pColorManager->add(name, scheme);
        ui->cbScheme->addItem(name);
        ui->cbScheme->setCurrentText(name);
    } catch (FileError e) {
        QMessageBox::critical(this,tr("Error"),e.reason());
        return;
    }
}

void EditorColorSchemeWidget::on_actionRename_Scheme_triggered()
{
    QString name = ui->cbScheme->currentText();
    bool isOk;
    QString newName = QInputDialog::getText(this,tr("New scheme name"),tr("New scheme name"),
                                            QLineEdit::Normal,name,&isOk);
    if (isOk) {
        if (!pColorManager->isValidName(newName)) {
            QMessageBox::critical(this,tr("Error"),tr("'%1' is not a valid scheme name!").arg(newName));
            return;
        }
        try {
            pColorManager->rename(name,newName);
            ui->cbScheme->setItemText(
                        ui->cbScheme->currentIndex(),
                        newName
                        );
            if (mModifiedSchemes.contains(name))
                mModifiedSchemes.remove(name);
            mModifiedSchemes.insert(newName);
        } catch(FileError e) {
            QMessageBox::critical(this,tr("Error"),e.reason());
        }
    }
}

void EditorColorSchemeWidget::on_actionReset_Scheme_triggered()
{
    try {
        if (pColorManager->restoreToDefault(ui->cbScheme->currentText())) {
            ui->cbScheme->setItemData(
                        ui->cbScheme->currentIndex(),
                        mDefaultSchemeComboFont,
                        Qt::FontRole);
            ui->cbScheme->setFont(mDefaultSchemeComboFont);
            //ui->cbScheme->view()->setFont(mDefaultSchemeComboFont);
        }
    } catch (FileError e) {
        QMessageBox::critical(this,tr("Error"),e.reason());
    }

}

void EditorColorSchemeWidget::on_actionExport_Scheme_triggered()
{
    QString filename = QFileDialog::getSaveFileName(this,
        tr("Save"), QString(), tr("Color Scheme Files (*.scheme)"));
    if (filename.isEmpty())
        return;
    try {
        PColorScheme scheme = getCurrentScheme();
        scheme->save(filename);
    } catch (FileError e) {
        QMessageBox::critical(this,tr("Error"),e.reason());
        return;
    }
}

void EditorColorSchemeWidget::on_actionDelete_Scheme_triggered()
{

    QString name = ui->cbScheme->currentText();
    if (QMessageBox::warning(this,tr("Confirm Delete Scheme"),
                   tr("Scheme '%1' will be deleted!<br />Do you really want to continue?")
                   .arg(name),
                   QMessageBox::Yes, QMessageBox::No)!=QMessageBox::Yes)
        return;
    try {
        if (pColorManager->remove(name)) {
            if (mModifiedSchemes.contains(name))
                mModifiedSchemes.remove(name);
            ui->cbScheme->removeItem(ui->cbScheme->currentIndex());
            if (name == pSettings->editor().colorScheme())
                doSave();
        }
    }  catch (FileError e) {
        QMessageBox::critical(this,tr("Error"),e.reason());
    }
}



ColorSchemeItemDelegate::ColorSchemeItemDelegate(QObject *parent):
    QStyledItemDelegate{parent}
{

}

void ColorSchemeItemDelegate::initStyleOption(QStyleOptionViewItem *option, const QModelIndex &index) const
{
    QStyledItemDelegate::initStyleOption(option,index);
    QVariant value = index.data(Qt::FontRole);
    if (value.isValid() && !value.isNull()) {
        option->font = qvariant_cast<QFont>(value);
        option->fontMetrics = QFontMetrics(option->font);
    }
}