// SPDX-License-Identifier: GPL-3.0-or-later
// SPDX-FileCopyrightText: 2024 A-La-Karte Contributors

#include "gamemodel.h"

#include <algorithm>

GameModel::GameModel(QObject *parent)
    : QAbstractListModel(parent)
{
}

int GameModel::rowCount(const QModelIndex &parent) const
{
    if (parent.isValid()) {
        return 0;
    }
    return m_filteredGames.count();
}

QVariant GameModel::data(const QModelIndex &index, int role) const
{
    if (!index.isValid() || index.row() < 0 || index.row() >= m_filteredGames.count()) {
        return {};
    }

    Game *game = m_filteredGames.at(index.row());

    switch (role) {
    case IdRole:
        return game->id();
    case NameRole:
    case Qt::DisplayRole:
        return game->name();
    case DescriptionRole:
        return game->description();
    case DeveloperRole:
        return game->developer();
    case PublisherRole:
        return game->publisher();
    case CoverUrlRole:
        return game->coverUrl();
    case IconUrlRole:
        return game->iconUrl();
    case LaunchCommandRole:
        return game->launchCommand();
    case PlatformRole:
        return game->platform();
    case PlatformIdRole:
        return game->platformId();
    case LastPlayedRole:
        return game->lastPlayed();
    case PlayTimeRole:
        return game->playTime();
    case FavoriteRole:
        return game->favorite();
    case HiddenRole:
        return game->hidden();
    case InstalledRole:
        return game->installed();
    case RunningRole:
        return game->running();
    case GameObjectRole:
        return QVariant::fromValue(game);
    }

    return {};
}

bool GameModel::setData(const QModelIndex &index, const QVariant &value, int role)
{
    if (!index.isValid() || index.row() < 0 || index.row() >= m_filteredGames.count()) {
        return false;
    }

    Game *game = m_filteredGames.at(index.row());

    switch (role) {
    case FavoriteRole:
        game->setFavorite(value.toBool());
        break;
    case HiddenRole:
        game->setHidden(value.toBool());
        break;
    default:
        return false;
    }

    Q_EMIT dataChanged(index, index, {role});
    return true;
}

Qt::ItemFlags GameModel::flags(const QModelIndex &index) const
{
    if (!index.isValid()) {
        return Qt::NoItemFlags;
    }
    return Qt::ItemIsEnabled | Qt::ItemIsSelectable | Qt::ItemIsEditable;
}

QHash<int, QByteArray> GameModel::roleNames() const
{
    return {{IdRole, "gameId"},
            {NameRole, "name"},
            {DescriptionRole, "description"},
            {DeveloperRole, "developer"},
            {PublisherRole, "publisher"},
            {CoverUrlRole, "coverUrl"},
            {IconUrlRole, "iconUrl"},
            {LaunchCommandRole, "launchCommand"},
            {PlatformRole, "platform"},
            {PlatformIdRole, "platformId"},
            {LastPlayedRole, "lastPlayed"},
            {PlayTimeRole, "playTime"},
            {FavoriteRole, "favorite"},
            {HiddenRole, "hidden"},
            {InstalledRole, "installed"},
            {RunningRole, "running"},
            {GameObjectRole, "gameObject"}};
}

int GameModel::count() const
{
    return m_filteredGames.count();
}

QString GameModel::filterText() const
{
    return m_filterText;
}

void GameModel::setFilterText(const QString &text)
{
    if (m_filterText != text) {
        m_filterText = text;
        applyFilter();
        Q_EMIT filterTextChanged();
    }
}

QString GameModel::filterPlatform() const
{
    return m_filterPlatform;
}

void GameModel::setFilterPlatform(const QString &platform)
{
    if (m_filterPlatform != platform) {
        m_filterPlatform = platform;
        applyFilter();
        Q_EMIT filterPlatformChanged();
    }
}

bool GameModel::showHidden() const
{
    return m_showHidden;
}

void GameModel::setShowHidden(bool show)
{
    if (m_showHidden != show) {
        m_showHidden = show;
        applyFilter();
        Q_EMIT showHiddenChanged();
    }
}

bool GameModel::favoritesOnly() const
{
    return m_favoritesOnly;
}

void GameModel::setFavoritesOnly(bool favorites)
{
    if (m_favoritesOnly != favorites) {
        m_favoritesOnly = favorites;
        applyFilter();
        Q_EMIT favoritesOnlyChanged();
    }
}

GameModel::SortMode GameModel::sortMode() const
{
    return m_sortMode;
}

void GameModel::setSortMode(SortMode mode)
{
    if (m_sortMode != mode) {
        m_sortMode = mode;
        applySort();
        Q_EMIT sortModeChanged();
    }
}

void GameModel::addGame(Game *game)
{
    if (!game)
        return;

    // Check for duplicates
    for (Game *existing : m_games) {
        if (existing->platform() == game->platform() && existing->platformId() == game->platformId()) {
            delete game;
            return;
        }
    }

    game->setParent(this);

    beginInsertRows(QModelIndex(), m_games.count(), m_games.count());
    m_games.append(game);
    endInsertRows();

    applyFilter();
    Q_EMIT countChanged();
}

void GameModel::removeGame(const QString &id)
{
    for (int i = 0; i < m_games.count(); ++i) {
        if (m_games.at(i)->id() == id) {
            int filteredIndex = m_filteredGames.indexOf(m_games.at(i));
            if (filteredIndex >= 0) {
                beginRemoveRows(QModelIndex(), filteredIndex, filteredIndex);
                m_filteredGames.removeAt(filteredIndex);
                endRemoveRows();
            }

            delete m_games.takeAt(i);
            Q_EMIT countChanged();
            return;
        }
    }
}

Game *GameModel::gameAt(int index) const
{
    if (index < 0 || index >= m_filteredGames.count()) {
        return nullptr;
    }
    return m_filteredGames.at(index);
}

Game *GameModel::gameById(const QString &id) const
{
    for (Game *game : m_games) {
        if (game->id() == id) {
            return game;
        }
    }
    return nullptr;
}

void GameModel::clear()
{
    beginResetModel();
    qDeleteAll(m_games);
    m_games.clear();
    m_filteredGames.clear();
    endResetModel();
    Q_EMIT countChanged();
}

QStringList GameModel::platforms() const
{
    QStringList result;
    for (Game *game : m_games) {
        if (!result.contains(game->platform())) {
            result.append(game->platform());
        }
    }
    result.sort();
    return result;
}

bool GameModel::matchesFilter(Game *game) const
{
    if (!m_showHidden && game->hidden()) {
        return false;
    }

    if (m_favoritesOnly && !game->favorite()) {
        return false;
    }

    if (!m_filterPlatform.isEmpty() && game->platform() != m_filterPlatform) {
        return false;
    }

    if (!m_filterText.isEmpty()) {
        bool matches = game->name().contains(m_filterText, Qt::CaseInsensitive) || game->developer().contains(m_filterText, Qt::CaseInsensitive)
            || game->publisher().contains(m_filterText, Qt::CaseInsensitive);
        if (!matches) {
            return false;
        }
    }

    return true;
}

void GameModel::applyFilter()
{
    beginResetModel();

    m_filteredGames.clear();
    for (Game *game : m_games) {
        if (matchesFilter(game)) {
            m_filteredGames.append(game);
        }
    }

    applySort();

    endResetModel();
    Q_EMIT countChanged();
}

void GameModel::applySort()
{
    std::sort(m_filteredGames.begin(), m_filteredGames.end(), [this](Game *a, Game *b) {
        // Favorites always first
        if (a->favorite() != b->favorite()) {
            return a->favorite();
        }

        switch (m_sortMode) {
        case SortByName:
            return a->name().compare(b->name(), Qt::CaseInsensitive) < 0;
        case SortByLastPlayed:
            return a->lastPlayed() > b->lastPlayed();
        case SortByPlayTime:
            return a->playTime() > b->playTime();
        case SortByPlatform:
            if (a->platform() != b->platform()) {
                return a->platform() < b->platform();
            }
            return a->name().compare(b->name(), Qt::CaseInsensitive) < 0;
        case SortByRecent:
            return a->lastPlayed() > b->lastPlayed();
        }
        return false;
    });
}