/*!
 * Copyright (C) 2020 by Savoir-faire Linux
 * Author: Aline Gondim Santos <aline.gondimsantos@savoirfairelinux.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 "preferenceitemlistmodel.h"

#include "lrcinstance.h"
#include "utils.h"

#include "api/pluginmodel.h"

#include <map>

// TODO: Use QMap
std::map<QString, int> mapType {{QString("List"), PreferenceItemListModel::Type::LIST},
                                {QString("Path"), PreferenceItemListModel::Type::PATH},
                                {QString("EditText"), PreferenceItemListModel::Type::EDITTEXT},
                                {QString("Switch"), PreferenceItemListModel::Type::SWITCH}};

PreferenceItemListModel::PreferenceItemListModel(QObject* parent, LRCInstance* instance)
    : AbstractListModelBase(parent)
{
    lrcInstance_ = instance;
}

PreferenceItemListModel::~PreferenceItemListModel() {}

int
PreferenceItemListModel::rowCount(const QModelIndex& parent) const
{
    if (!parent.isValid() && lrcInstance_) {
        /// Count.
        return preferenceList_.size();
    }
    /// A valid QModelIndex returns 0 as no entry has sub-elements.
    return 0;
}

int
PreferenceItemListModel::columnCount(const QModelIndex& parent) const
{
    Q_UNUSED(parent);
    /// Only need one column.
    return 1;
}

QVariant
PreferenceItemListModel::data(const QModelIndex& index, int role) const
{
    if (!index.isValid() || preferenceList_.size() <= index.row()) {
        return QVariant();
    }

    QString preferenceCurrent = QString("");
    int type = Type::DEFAULT;
    QString currentPath = QString("");
    QStringList acceptedFiles = {};
    bool checkImage = false;

    auto details = preferenceList_.at(index.row());
    preferenceCurrent = lrcInstance_->pluginModel().getPluginPreferencesValues(
        pluginId_)[details["key"]];
    auto it = mapType.find(details["type"]);
    if (it != mapType.end()) {
        type = mapType[details["type"]];
        if (type == Type::PATH) {
            currentPath = preferenceCurrent;
            currentPath.truncate(preferenceCurrent.lastIndexOf("/"));
            QStringList mimeTypeList = details["mimeType"].split(',');
            for (auto& mimeType : mimeTypeList) {
                mimeType = mimeType.mid(mimeType.lastIndexOf("/") + 1);
                acceptedFiles.append((mimeType.toUpper() + " Files") + " (*." + mimeType + ")");
                checkImage |= Utils::isImage(mimeType);
            }
            acceptedFiles.append(QString("All (*.%1)").arg(mimeTypeList.join(" *.")));
        }
    }
    const auto dependsOn = details["dependsOn"].split(",");
    const auto preferences = lrcInstance_->pluginModel().getPluginPreferences(pluginId_);
    const auto prefValues = lrcInstance_->pluginModel().getPluginPreferencesValues(pluginId_);
    bool enabled = true;
    for (auto& preference : preferences) {
        auto key = preference["key"];
        auto prefValue = prefValues[key];
        for (auto& item : dependsOn) {
            if (preference["type"] == "Switch" && item.endsWith(key)) {
                if (!item.startsWith("!") && prefValue == "0") {
                    enabled = false;
                    break;
                } else if (item.startsWith("!") && prefValue == "1") {
                    enabled = false;
                    break;
                }
            }
        }
    }

    switch (role) {
    case Role::PreferenceKey:
        return QVariant(details["key"]);
    case Role::PreferenceName:
        return QVariant(details["title"]);
    case Role::PreferenceSummary:
        return QVariant(details["summary"]);
    case Role::PreferenceType:
        return QVariant(type);
    case Role::PluginId:
        return QVariant(pluginId_);
    case Role::PreferenceCurrentValue:
        return QVariant(preferenceCurrent);
    case Role::CurrentPath:
        return QVariant(currentPath);
    case Role::FileFilters:
        return QVariant(acceptedFiles);
    case Role::IsImage:
        return QVariant(checkImage);
    case Role::Enabled:
        return QVariant(enabled);
    }

    return QVariant();
}

QHash<int, QByteArray>
PreferenceItemListModel::roleNames() const
{
    QHash<int, QByteArray> roles;
    roles[PreferenceKey] = "PreferenceKey";
    roles[PreferenceName] = "PreferenceName";
    roles[PreferenceSummary] = "PreferenceSummary";
    roles[PreferenceType] = "PreferenceType";
    roles[PluginId] = "PluginId";
    roles[PreferenceCurrentValue] = "PreferenceCurrentValue";
    roles[CurrentPath] = "CurrentPath";
    roles[FileFilters] = "FileFilters";
    roles[IsImage] = "IsImage";
    roles[Enabled] = "Enabled";
    return roles;
}

QModelIndex
PreferenceItemListModel::index(int row, int column, const QModelIndex& parent) const
{
    Q_UNUSED(parent);
    if (column != 0) {
        return QModelIndex();
    }

    if (row >= 0 && row < rowCount()) {
        return createIndex(row, column);
    }
    return QModelIndex();
}

QModelIndex
PreferenceItemListModel::parent(const QModelIndex& child) const
{
    Q_UNUSED(child);
    return QModelIndex();
}

Qt::ItemFlags
PreferenceItemListModel::flags(const QModelIndex& index) const
{
    auto flags = QAbstractItemModel::flags(index) | Qt::ItemNeverHasChildren | Qt::ItemIsSelectable;
    if (!index.isValid()) {
        return QAbstractItemModel::flags(index);
    }
    return flags;
}

void
PreferenceItemListModel::reset()
{
    beginResetModel();
    endResetModel();
}

QString
PreferenceItemListModel::pluginId() const
{
    return pluginId_;
}

void
PreferenceItemListModel::setPluginId(const QString& pluginId)
{
    pluginId_ = pluginId;
    preferencesCount();
}

QString
PreferenceItemListModel::mediaHandlerName() const
{
    return mediaHandlerName_;
}

void
PreferenceItemListModel::setMediaHandlerName(const QString mediaHandlerName)
{
    mediaHandlerName_ = mediaHandlerName;
}

QString
PreferenceItemListModel::category() const
{
    return category_;
}

void
PreferenceItemListModel::setCategory(const QString category)
{
    category_ = category;
}

int
PreferenceItemListModel::preferencesCount()
{
    if (!preferenceList_.isEmpty())
        return preferenceList_.size();
    if (mediaHandlerName_.isEmpty()) {
        auto preferences = lrcInstance_->pluginModel().getPluginPreferences(pluginId_);
        if (category_ != "all")
            for (auto& preference : preferences) {
                if (preference["category"] == category_)
                    preferenceList_.push_back(preference);
            }
        else
            preferenceList_ = preferences;
        return preferenceList_.size();
    } else {
        auto preferences = lrcInstance_->pluginModel().getPluginPreferences(pluginId_);
        for (auto& preference : preferences) {
            QStringList scopeList = preference["scope"].split(",");
            if (scopeList.contains(mediaHandlerName_))
                preferenceList_.push_back(preference);
        }
        return preferenceList_.size();
    }
}