/*
 * Copyright (C) 2020, KylinSoft Co., Ltd.
 *
 * 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/>.
 *
 * Authors: zhangzihao <zhangzihao@kylinos.cn>
 * Modified by: zhangpengfei <zhangpengfei@kylinos.cn>
 *
 */
#include <QtConcurrent>
#include <QPalette>
#include "global-settings.h"

using namespace UkuiSearch;
static GlobalSettings *globalInstance = nullptr;

GlobalSettings *GlobalSettings::getInstance() {
    if(!globalInstance) {
        globalInstance = new GlobalSettings;
    }
    return globalInstance;
}

GlobalSettings::GlobalSettings(QObject *parent) : QObject(parent)
{
    //搜索黑名单过滤
    m_blockDirsSettings = new QSettings(BLOCK_DIRS, QSettings::IniFormat, this);
    m_blockDirsSettings->setIniCodec(QTextCodec::codecForName("UTF-8"));
    if (!QFile::exists(BLOCK_DIRS)) {
        QFile file(BLOCK_DIRS);
        file.open(QIODevice::ReadOnly);
        file.close();
    }
    m_blockDirsSettings->sync();

    m_confWatcher = new QFileSystemWatcher(this);
    m_confWatcher->addPath(BLOCK_DIRS);
    connect(m_confWatcher, &QFileSystemWatcher::fileChanged, this, [ & ]() {
        m_blockDirsSettings->sync();
        m_confWatcher->addPath(BLOCK_DIRS);
    });
    //搜索历史记录
    m_searchRecordSettings = new QSettings(SEARCH_HISTORY, QSettings::IniFormat, this);
    m_searchRecordSettings->setIniCodec(QTextCodec::codecForName("UTF-8"));
    for(QString i : m_searchRecordSettings->allKeys()) {
        m_history.append(QUrl::fromPercentEncoding(i.toLocal8Bit()));
    }
    if(!QDBusConnection::sessionBus().connect("org.kylinssoclient.dbus",
            "/org/kylinssoclient/path",
            "org.freedesktop.kylinssoclient.interface",
            "keyChanged",
            this, SLOT(updateSearchHistory(QString))))
        qWarning() << "Kylinssoclient Dbus connect fail!";

    //全局页面透明度
    //the default number of transparency for mainwindow is 0.7
    setValue(TRANSPARENCY_KEY, 0.7);
    if(QGSettings::isSchemaInstalled(CONTROL_CENTER_PERSONALISE_GSETTINGS_ID)) {
        m_transGsettings = new QGSettings(CONTROL_CENTER_PERSONALISE_GSETTINGS_ID, QByteArray(), this);
        connect(m_transGsettings, &QGSettings::changed, this, [ = ](const QString & key) {
            if(key == TRANSPARENCY_KEY) {
                setValue(TRANSPARENCY_KEY, m_transGsettings->get(TRANSPARENCY_KEY).toDouble());
                qApp->paletteChanged(qApp->palette());
                Q_EMIT this->transparencyChanged(m_transGsettings->get(TRANSPARENCY_KEY).toDouble());
            }
        });
        if(m_transGsettings->keys().contains(TRANSPARENCY_KEY)) {
            setValue(TRANSPARENCY_KEY, m_transGsettings->get(TRANSPARENCY_KEY).toDouble());
        }
    }

    //主题，字体大小
    setValue(STYLE_NAME_KEY, "ukui-light");
    setValue(FONT_SIZE_KEY, 11);
    if(QGSettings::isSchemaInstalled(THEME_GSETTINGS_ID)) {
        m_themeGsettings = new QGSettings(THEME_GSETTINGS_ID, QByteArray(), this);
        connect(m_themeGsettings, &QGSettings::changed, this, [ = ](const QString & key) {
            if(key == STYLE_NAME_KEY) {
                //当前主题改变时也发出paletteChanged信号，通知主界面刷新
                setValue(STYLE_NAME_KEY, m_themeGsettings->get(STYLE_NAME_KEY).toString());
                qApp->paletteChanged(qApp->palette());
                Q_EMIT this->styleChanged(m_themeGsettings->get(STYLE_NAME_KEY).toString());
            } else if(key == FONT_SIZE_KEY) {
                setValue(FONT_SIZE_KEY, m_themeGsettings->get(FONT_SIZE_KEY).toDouble());
                qApp->paletteChanged(qApp->palette());
            } else if (key == ICON_THEME_KEY) {
                qApp->paletteChanged(qApp->palette());
            }
        });
        if(m_themeGsettings->keys().contains(STYLE_NAME_KEY)) {
            setValue(STYLE_NAME_KEY, m_themeGsettings->get(STYLE_NAME_KEY).toString());
        }
        if(m_themeGsettings->keys().contains(FONT_SIZE_KEY)) {
            setValue(FONT_SIZE_KEY, m_themeGsettings->get(FONT_SIZE_KEY).toDouble());
        }
    }

    //文件索引与搜索插件相关设置
    setValue(FILE_INDEX_ENABLE_KEY, false);
    setValue(WEB_ENGINE_KEY, "baidu");
    setValue(CONTENT_FUZZY_SEARCH_KEY, false);
    if(QGSettings::isSchemaInstalled(UKUI_SEARCH_SCHEMAS)) {
        m_searchGsettings = new QGSettings(UKUI_SEARCH_SCHEMAS, QByteArray(), this);
        connect(m_searchGsettings, &QGSettings::changed, this, [ = ](const QString & key) {
            if(key == FILE_INDEX_ENABLE_KEY) {
                bool fileSearchEnable = m_searchGsettings->get(FILE_INDEX_ENABLE_KEY).toBool();
                setValue(FILE_INDEX_ENABLE_KEY, fileSearchEnable);
                Q_EMIT fileSearchEnableChanged(fileSearchEnable);
            } else if(key == WEB_ENGINE_KEY) {
                QString webSearchEngine = m_searchGsettings->get(WEB_ENGINE_KEY).toString();
                setValue(WEB_ENGINE_KEY, webSearchEngine);
                Q_EMIT webSearchEngineChanged(webSearchEngine);
            } else if (key == CONTENT_FUZZY_SEARCH_KEY) {
                bool contentFuzzySearch = m_searchGsettings->get(CONTENT_FUZZY_SEARCH_KEY).toBool();
                setValue(CONTENT_FUZZY_SEARCH_KEY, contentFuzzySearch);
                Q_EMIT contentFuzzySearchEnableChanged(contentFuzzySearch);
            }
        });
        if(m_searchGsettings->keys().contains(FILE_INDEX_ENABLE_KEY)) {
            setValue(FILE_INDEX_ENABLE_KEY, m_searchGsettings->get(FILE_INDEX_ENABLE_KEY).toBool());
        }
        if(m_searchGsettings->keys().contains(WEB_ENGINE_KEY)) {
            setValue(WEB_ENGINE_KEY, m_searchGsettings->get(WEB_ENGINE_KEY).toString());
        }
        if(m_searchGsettings->keys().contains(CONTENT_FUZZY_SEARCH_KEY)) {
            setValue(CONTENT_FUZZY_SEARCH_KEY, m_searchGsettings->get(CONTENT_FUZZY_SEARCH_KEY).toBool());
        }
    }
}

const QVariant GlobalSettings::getValue(const QString &key) {

    m_mutex.lock();
    QVariant value =  m_cache.value(key);
    m_mutex.unlock();
    return value;
}

bool GlobalSettings::setBlockDirs(const QString &path, int &returnCode, bool remove) {
    if(remove) {
        if(path.isEmpty()) {
            returnCode = PATH_EMPTY;
            return false;
        }

        m_blockDirsSettings->remove(path);
        return true;
    }

    //why QSetting's key can't start with "/"??
    QString pathKey = path.right(path.length() - 1);

    if (pathKey.endsWith(QLatin1Char('/'))) {
        pathKey = pathKey.mid(0, pathKey.length() - 1);
    }

    QStringList blockDirs = m_blockDirsSettings->allKeys();
    for(QString i : blockDirs) {
        if(FileUtils::isOrUnder(pathKey, i)) {
//            returnCode = QString(tr("My parent folder has been blocked!"));
            returnCode = PATH_PARENT_BLOCKED;
            return false;
        }

        if(FileUtils::isOrUnder(i, pathKey))
            m_blockDirsSettings->remove(i);
    }
    m_blockDirsSettings->setValue(pathKey, "0");
    return true;
}

QStringList GlobalSettings::getBlockDirs() {
    QStringList blockList;
    QStringList tmp = m_blockDirsSettings->allKeys();
    for (const QString& blockDir : tmp) {
        QString wholePath = "/" + blockDir;
        if (QFile::exists(wholePath)) {
            blockList.append(wholePath);
        } else {
            m_blockDirsSettings->remove(blockDir);
            m_blockDirsSettings->sync();
        }
    }
    return blockList;
}

void GlobalSettings::setSearchRecord(const QString &word, const QDateTime &time) {
    QStringList keys = m_searchRecordSettings->allKeys();
    if(keys.contains(QString(QUrl::toPercentEncoding(word))))
        m_history.removeOne(word);
    m_searchRecordSettings->setValue(QString(QUrl::toPercentEncoding(word)), time.toString("yyyy-MM-dd hh:mm:ss"));
    if(keys.size() >= 20)
        m_searchRecordSettings->remove(QString(QUrl::toPercentEncoding(m_history.takeFirst())));
    m_history.append(word);
}

QStringList GlobalSettings::getSearchRecord() {
    return m_history;
}

//this method is designed for main process settings only!!
void GlobalSettings::setValue(const QString &key, const QVariant &value) {
    m_mutex.lock();
    m_cache.insert(key, value);
    m_mutex.unlock();
}

void GlobalSettings::updateSearchHistory(QString key) {
    if(key == "search") {
        m_searchRecordSettings->sync();
        m_history.clear();
        for(QString i : m_searchRecordSettings->allKeys()) {
            m_history.append(QUrl::fromPercentEncoding(i.toLocal8Bit()));
        }
    }
}