// SPDX-License-Identifier: GPL-3.0-or-later
// SPDX-FileCopyrightText: 2026 A-La-Karte Contributors

#include "flatpakimporter.h"

#include <QDir>
#include <QFile>
#include <QProcess>
#include <QRegularExpression>
#include <QSettings>

FlatpakImporter::FlatpakImporter(QObject *parent)
    : PlatformImporter(parent)
{
}

QString FlatpakImporter::platformName() const
{
    return QStringLiteral("Flatpak");
}

QString FlatpakImporter::platformId() const
{
    return QStringLiteral("flatpak");
}

QStringList FlatpakImporter::getFlatpakPaths() const
{
    QStringList paths;

    // User Flatpak exports
    paths << expandPath(QStringLiteral("~/.local/share/flatpak/exports/share/applications"));
    // System Flatpak exports
    paths << QStringLiteral("/var/lib/flatpak/exports/share/applications");

    return paths;
}

bool FlatpakImporter::isAvailable() const
{
    return !findExecutable(QStringLiteral("flatpak")).isEmpty();
}

bool FlatpakImporter::isGameApp(const QString &desktopFilePath) const
{
    QSettings desktop(desktopFilePath, QSettings::IniFormat);
    desktop.beginGroup(QStringLiteral("Desktop Entry"));

    QString type = desktop.value(QStringLiteral("Type")).toString();
    if (type != QStringLiteral("Application")) {
        return false;
    }

    if (desktop.value(QStringLiteral("Hidden"), false).toBool()) {
        return false;
    }
    if (desktop.value(QStringLiteral("NoDisplay"), false).toBool()) {
        return false;
    }

    QString categories = desktop.value(QStringLiteral("Categories")).toString();
    QStringList gameCategories = {QStringLiteral("Game"),
                                  QStringLiteral("ArcadeGame"),
                                  QStringLiteral("ActionGame"),
                                  QStringLiteral("AdventureGame"),
                                  QStringLiteral("BlocksGame"),
                                  QStringLiteral("BoardGame"),
                                  QStringLiteral("CardGame"),
                                  QStringLiteral("KidsGame"),
                                  QStringLiteral("LogicGame"),
                                  QStringLiteral("RolePlaying"),
                                  QStringLiteral("Shooter"),
                                  QStringLiteral("Simulation"),
                                  QStringLiteral("SportsGame"),
                                  QStringLiteral("StrategyGame")};

    for (const QString &cat : gameCategories) {
        if (categories.contains(cat, Qt::CaseInsensitive)) {
            return true;
        }
    }

    return false;
}

Game *FlatpakImporter::parseDesktopFile(const QString &filePath, const QString &appId) const
{
    QSettings desktop(filePath, QSettings::IniFormat);
    desktop.beginGroup(QStringLiteral("Desktop Entry"));

    QString name = desktop.value(QStringLiteral("Name")).toString();
    QString icon = desktop.value(QStringLiteral("Icon")).toString();
    QString comment = desktop.value(QStringLiteral("Comment")).toString();

    if (name.isEmpty()) {
        return nullptr;
    }

    QString gameId = QStringLiteral("flatpak_") + appId.toLower().replace(QStringLiteral("."), QStringLiteral("_"));

    Game *game = new Game(gameId, name);
    game->setPlatform(platformName());
    game->setPlatformId(platformId());
    game->setLaunchCommand(QStringLiteral("flatpak run %1").arg(appId));

    if (!comment.isEmpty()) {
        game->setDescription(comment);
    }

    // Try to find icon
    if (!icon.isEmpty()) {
        QStringList iconPaths = {
            expandPath(QStringLiteral("~/.local/share/flatpak/exports/share/icons/hicolor/256x256/apps/") + icon + QStringLiteral(".png")),
            QStringLiteral("/var/lib/flatpak/exports/share/icons/hicolor/256x256/apps/") + icon + QStringLiteral(".png"),
            expandPath(QStringLiteral("~/.local/share/flatpak/exports/share/icons/hicolor/128x128/apps/") + icon + QStringLiteral(".png")),
            QStringLiteral("/var/lib/flatpak/exports/share/icons/hicolor/128x128/apps/") + icon + QStringLiteral(".png"),
        };

        for (const QString &iconPath : iconPaths) {
            if (QFile::exists(iconPath)) {
                const QUrl url = QUrl::fromLocalFile(iconPath);
                game->setIconUrl(url);
                if (!game->coverUrl().isValid() || game->coverUrl().isEmpty()) {
                    game->setCoverUrl(url);
                }
                break;
            }
        }
    }

    return game;
}

QList<Game *> FlatpakImporter::importGames()
{
    QList<Game *> games;

    for (const QString &path : getFlatpakPaths()) {
        QDir dir(path);
        if (!dir.exists()) {
            continue;
        }

        QStringList desktopFiles = dir.entryList({QStringLiteral("*.desktop")}, QDir::Files);
        int total = desktopFiles.count();
        int current = 0;

        for (const QString &fileName : desktopFiles) {
            current++;
            Q_EMIT importProgress(current, total);

            QString filePath = dir.absoluteFilePath(fileName);

            if (!isGameApp(filePath)) {
                continue;
            }

            // Extract app ID from filename (e.g., "com.example.Game.desktop" -> "com.example.Game")
            QString appId = fileName;
            appId.chop(8); // Remove ".desktop"

            Game *game = parseDesktopFile(filePath, appId);
            if (game) {
                games.append(game);
            }
        }
    }

    return games;
}