// This file was part of the KDE libraries
// SPDX-FileCopyrightText: 2022 Tao Guo <guotao945@gmail.com>
// SPDX-License-Identifier: GPL-2.0-or-later

#include "quickcommandswidget.h"
#include "filtermodel.h"
#include "konsoledebug.h"
#include "terminalDisplay/TerminalDisplay.h"

#include <QMenu>

#include "ui_qcwidget.h"
#include <KLocalizedString>
#include <KMessageBox>

#include <QSettings>
#include <QStandardPaths>
#include <QTemporaryFile>
#include <QTimer>

#include <QShowEvent>

#include <kmessagebox.h>
#include <kstandardguiitem.h>

struct QuickCommandsWidget::Private {
    QuickCommandsModel *model = nullptr;
    FilterModel *filterModel = nullptr;
    Konsole::SessionController *controller = nullptr;
    bool hasShellCheck = false;
    bool isSetup = false;
    QTimer shellCheckTimer;
};

QuickCommandsWidget::QuickCommandsWidget(QWidget *parent)
    : QWidget(parent)
    , ui(std::make_unique<Ui::QuickCommandsWidget>())
    , priv(std::make_unique<Private>())
{
    ui->setupUi(this);

    priv->hasShellCheck = !QStandardPaths::findExecutable(QStringLiteral("shellcheck")).isEmpty();
    if (!priv->hasShellCheck) {
        ui->warning->setPlainText(QStringLiteral("Missing executable 'shellcheck', please install"));
    }
    priv->shellCheckTimer.setSingleShot(true);

    priv->filterModel = new FilterModel(this);
    connect(ui->btnAdd, &QPushButton::clicked, this, &QuickCommandsWidget::addMode);
    connect(ui->btnSave, &QPushButton::clicked, this, &QuickCommandsWidget::saveCommand);
    connect(ui->btnUpdate, &QPushButton::clicked, this, &QuickCommandsWidget::updateCommand);
    connect(ui->btnCancel, &QPushButton::clicked, this, &QuickCommandsWidget::viewMode);
    connect(ui->btnRun, &QPushButton::clicked, this, &QuickCommandsWidget::runCommand);

    connect(ui->invertFilter, &QPushButton::clicked, priv->filterModel, &FilterModel::setInvertFilter);

    connect(ui->filterLine, &QLineEdit::textChanged, this, [this] {
        priv->filterModel->setFilterRegularExpression(ui->filterLine->text());
        priv->filterModel->invalidate();
    });

    ui->commandsTreeView->setModel(priv->filterModel);
    ui->commandsTreeView->setContextMenuPolicy(Qt::CustomContextMenu);
    connect(ui->commandsTreeView, &QTreeView::doubleClicked, this, &QuickCommandsWidget::invokeCommand);
    connect(ui->commandsTreeView, &QTreeView::clicked, this, &QuickCommandsWidget::indexSelected);

    connect(ui->commandsTreeView, &QTreeView::customContextMenuRequested, this, &QuickCommandsWidget::createMenu);

    connect(&priv->shellCheckTimer, &QTimer::timeout, this, &QuickCommandsWidget::runShellCheck);
    connect(ui->command, &QPlainTextEdit::textChanged, this, [this] {
        priv->shellCheckTimer.start(250);
    });

    viewMode();

    QSettings settings;
    settings.beginGroup(QStringLiteral("plugins"));
    settings.beginGroup(QStringLiteral("quickcommands"));

    const QKeySequence def(Qt::CTRL | Qt::ALT | Qt::Key_G);
    const QString defText = def.toString();
    const QString entry = settings.value(QStringLiteral("shortcut"), defText).toString();
    const QKeySequence shortcutEntry(entry);

    connect(ui->keySequenceEdit, &QKeySequenceEdit::keySequenceChanged, this, [this] {
        auto shortcut = ui->keySequenceEdit->keySequence();
        Q_EMIT quickAccessShortcutChanged(shortcut);
    });
    ui->keySequenceEdit->setKeySequence(shortcutEntry);
}

QuickCommandsWidget::~QuickCommandsWidget() = default;

void QuickCommandsWidget::prepareEdit()
{
    QString groupName = ui->group->currentText();

    ui->group->clear();
    ui->group->addItems(priv->model->groups());
    ui->group->setCurrentText(groupName);
    ui->commandsTreeView->setDisabled(true);

    ui->commandsWidget->show();
}
void QuickCommandsWidget::viewMode()
{
    ui->commandsTreeView->setDisabled(false);
    ui->commandsWidget->hide();
    ui->btnAdd->show();
    ui->btnSave->hide();
    ui->btnUpdate->hide();
    ui->btnCancel->hide();
}

void QuickCommandsWidget::addMode()
{
    ui->btnAdd->hide();
    ui->btnSave->show();
    ui->btnUpdate->hide();
    ui->btnCancel->show();
    prepareEdit();
}

void QuickCommandsWidget::indexSelected(const QModelIndex &idx)
{
    Q_UNUSED(idx)

    const auto sourceIdx = priv->filterModel->mapToSource(ui->commandsTreeView->currentIndex());
    if (priv->model->rowCount(sourceIdx) != 0) {
        ui->name->setText({});
        ui->tooltip->setText({});
        ui->command->setPlainText({});
        ui->group->setCurrentText({});
        return;
    }

    const auto item = priv->model->itemFromIndex(sourceIdx);

    if (item != nullptr && item->parent() != nullptr) {
        const auto data = item->data(QuickCommandsModel::QuickCommandRole).value<QuickCommandData>();
        ui->name->setText(data.name);
        ui->tooltip->setText(data.tooltip);
        ui->command->setPlainText(data.command);
        ui->group->setCurrentText(item->parent()->text());

        runShellCheck();
    }
}

void QuickCommandsWidget::editMode()
{
    ui->btnAdd->hide();
    ui->btnSave->hide();
    ui->btnUpdate->show();
    ui->btnCancel->show();
    prepareEdit();
}

void QuickCommandsWidget::saveCommand()
{
    if (!valid())
        return;
    if (priv->model->addChildItem(data(), ui->group->currentText()))
        viewMode();
    else
        KMessageBox::error(this, i18n("A duplicate item exists"));
}

void QuickCommandsWidget::updateCommand()
{
    const auto sourceIdx = priv->filterModel->mapToSource(ui->commandsTreeView->currentIndex());
    if (!valid())
        return;
    if (priv->model->editChildItem(data(), sourceIdx, ui->group->currentText()))
        viewMode();
    else
        KMessageBox::error(this, i18n("A duplicate item exists"));
}

void QuickCommandsWidget::invokeCommand(const QModelIndex &idx)
{
    if (!ui->warning->toPlainText().isEmpty()) {
        QMessageBox::warning(this, QStringLiteral("Shell Errors"), i18n("Please fix all the warnings before trying to run this script"));
        return;
    }

    if (!priv->controller) {
        return;
    }
    const auto sourceIdx = priv->filterModel->mapToSource(idx);
    if (sourceIdx.parent() == priv->model->invisibleRootItem()->index()) {
        return;
    }
    const auto item = priv->model->itemFromIndex(sourceIdx);
    const auto data = item->data(QuickCommandsModel::QuickCommandRole).value<QuickCommandData>();
    priv->controller->session()->sendTextToTerminal(data.command, QLatin1Char('\r'));

    if (priv->controller->session()->views().count()) {
        priv->controller->session()->views().at(0)->setFocus();
    }
}

void QuickCommandsWidget::runCommand()
{
    if (!priv->hasShellCheck) {
        // check again
        priv->hasShellCheck = !QStandardPaths::findExecutable(QStringLiteral("shellcheck")).isEmpty();
        if (priv->hasShellCheck) {
            ui->warning->clear();
        }
    }

    if (!ui->warning->toPlainText().isEmpty()) {
        auto choice = KMessageBox::questionTwoActions(this,
                                                      i18n("There are some errors on the script, do you really want to run it?"),
                                                      i18n("Shell Errors"),
                                                      KGuiItem(i18nc("@action:button", "Run"), QStringLiteral("system-run")),
                                                      KStandardGuiItem::cancel(),
                                                      QStringLiteral("quick-commands-question"));
        if (choice == KMessageBox::SecondaryAction) {
            return;
        }
    }

    const QString command = ui->command->toPlainText();
    priv->controller->session()->sendTextToTerminal(command, QLatin1Char('\r'));
    if (priv->controller->session()->views().count()) {
        priv->controller->session()->views().at(0)->setFocus();
    }
}

void QuickCommandsWidget::triggerRename()
{
    ui->commandsTreeView->edit(ui->commandsTreeView->currentIndex());
}

void QuickCommandsWidget::triggerDelete()
{
    const auto idx = ui->commandsTreeView->currentIndex();
    const QString text = idx.data(Qt::DisplayRole).toString();
    const QString dialogMessage = ui->commandsTreeView->model()->rowCount(idx)
        ? i18n("You are about to delete the group %1,\n with multiple configurations, are you sure?", text)
        : i18n("You are about to delete %1, are you sure?", text);

    int result =
        KMessageBox::warningTwoActions(this, dialogMessage, i18n("Delete Quick Commands Configurations"), KStandardGuiItem::del(), KStandardGuiItem::cancel());
    if (result != KMessageBox::PrimaryAction)
        return;

    const auto sourceIdx = priv->filterModel->mapToSource(idx);
    priv->model->removeRow(sourceIdx.row(), sourceIdx.parent());
}

QuickCommandData QuickCommandsWidget::data() const
{
    QuickCommandData data;
    data.name = ui->name->text().trimmed();
    data.tooltip = ui->tooltip->text();
    data.command = ui->command->toPlainText();
    return data;
}

void QuickCommandsWidget::setModel(QuickCommandsModel *model)
{
    priv->model = model;
    priv->filterModel->setSourceModel(model);
}
void QuickCommandsWidget::setCurrentController(Konsole::SessionController *controller)
{
    priv->controller = controller;
}

bool QuickCommandsWidget::valid()
{
    if (ui->name->text().isEmpty() || ui->name->text().trimmed().isEmpty()) {
        KMessageBox::error(this, i18n("Title can not be empty or blank"));
        return false;
    }
    if (ui->command->toPlainText().isEmpty()) {
        KMessageBox::error(this, i18n("Command can not be empty"));
        return false;
    }
    return true;
}

void QuickCommandsWidget::createMenu(const QPoint &pos)
{
    QModelIndex idx = ui->commandsTreeView->indexAt(pos);
    if (!idx.isValid())
        return;
    auto sourceIdx = priv->filterModel->mapToSource(idx);
    const bool isParent = sourceIdx.parent() == priv->model->invisibleRootItem()->index();
    QMenu *menu = new QMenu(this);

    if (!isParent) {
        auto actionEdit = new QAction(i18n("Edit"), ui->commandsTreeView);
        menu->addAction(actionEdit);
        connect(actionEdit, &QAction::triggered, this, &QuickCommandsWidget::editMode);
    } else {
        auto actionRename = new QAction(i18n("Rename"), ui->commandsTreeView);
        menu->addAction(actionRename);
        connect(actionRename, &QAction::triggered, this, &QuickCommandsWidget::triggerRename);
    }
    auto actionDelete = new QAction(i18n("Delete"), ui->commandsTreeView);
    menu->addAction(actionDelete);
    connect(actionDelete, &QAction::triggered, this, &QuickCommandsWidget::triggerDelete);
    menu->popup(ui->commandsTreeView->viewport()->mapToGlobal(pos));
}

void QuickCommandsWidget::runShellCheck()
{
    if (!priv->hasShellCheck) {
        return;
    }

    QTemporaryFile file;
    file.open();

    QTextStream ts(&file);
    ts << "#!/bin/bash\n";
    ts << ui->command->toPlainText();
    file.close();

    QString fName = file.fileName();
    QProcess process;
    process.start(QStringLiteral("shellcheck"), {fName});
    process.waitForFinished();

    const QString errorString = QString::fromLocal8Bit(process.readAllStandardOutput());
    ui->warning->setPlainText(errorString);

    if (errorString.isEmpty()) {
        ui->tabWidget->setTabText(1, i18n("Warnings"));
    } else {
        ui->tabWidget->setTabText(1, i18n("Warnings (*)"));
    }
}

void QuickCommandsWidget::showEvent(QShowEvent *)
{
    if (!priv->isSetup) {
        ui->commandsTreeView->expandAll();
        priv->isSetup = true;
    }
}

#include "moc_quickcommandswidget.cpp"
