/*
 * This file Copyright (C) 2009-2015 Mnemosyne LLC
 *
 * It may be used under the GNU GPL versions 2 or 3
 * or any future license endorsed by Mnemosyne LLC.
 *
 */

#include <cassert>
#include <cstdlib>

#include <QDateTime>
#include <QDir>
#include <QFile>

#include <libtransmission/transmission.h>
#include <libtransmission/utils.h>
#include <libtransmission/variant.h>

#include "CustomVariantType.h"
#include "Prefs.h"
#include "Utils.h"

/***
****
***/

Prefs::PrefItem Prefs::myItems[] =
{
    /* gui settings */
    { OPTIONS_PROMPT, TR_KEY_show_options_window, QVariant::Bool },
    { OPEN_DIALOG_FOLDER, TR_KEY_open_dialog_dir, QVariant::String },
    { INHIBIT_HIBERNATION, TR_KEY_inhibit_desktop_hibernation, QVariant::Bool },
    { DIR_WATCH, TR_KEY_watch_dir, QVariant::String },
    { DIR_WATCH_ENABLED, TR_KEY_watch_dir_enabled, QVariant::Bool },
    { SHOW_TRAY_ICON, TR_KEY_show_notification_area_icon, QVariant::Bool },
    { START_MINIMIZED, TR_KEY_start_minimized, QVariant::Bool },
    { SHOW_NOTIFICATION_ON_ADD, TR_KEY_torrent_added_notification_enabled, QVariant::Bool },
    { SHOW_NOTIFICATION_ON_COMPLETE, TR_KEY_torrent_complete_notification_enabled, QVariant::Bool },
    { ASKQUIT, TR_KEY_prompt_before_exit, QVariant::Bool },
    { SORT_MODE, TR_KEY_sort_mode, CustomVariantType::SortModeType },
    { SORT_REVERSED, TR_KEY_sort_reversed, QVariant::Bool },
    { COMPACT_VIEW, TR_KEY_compact_view, QVariant::Bool },
    { FILTERBAR, TR_KEY_show_filterbar, QVariant::Bool },
    { STATUSBAR, TR_KEY_show_statusbar, QVariant::Bool },
    { STATUSBAR_STATS, TR_KEY_statusbar_stats, QVariant::String },
    { SHOW_TRACKER_SCRAPES, TR_KEY_show_extra_peer_details, QVariant::Bool },
    { SHOW_BACKUP_TRACKERS, TR_KEY_show_backup_trackers, QVariant::Bool },
    { TOOLBAR, TR_KEY_show_toolbar, QVariant::Bool },
    { BLOCKLIST_DATE, TR_KEY_blocklist_date, QVariant::DateTime },
    { BLOCKLIST_UPDATES_ENABLED, TR_KEY_blocklist_updates_enabled, QVariant::Bool },
    { MAIN_WINDOW_LAYOUT_ORDER, TR_KEY_main_window_layout_order, QVariant::String },
    { MAIN_WINDOW_HEIGHT, TR_KEY_main_window_height, QVariant::Int },
    { MAIN_WINDOW_WIDTH, TR_KEY_main_window_width, QVariant::Int },
    { MAIN_WINDOW_X, TR_KEY_main_window_x, QVariant::Int },
    { MAIN_WINDOW_Y, TR_KEY_main_window_y, QVariant::Int },
    { FILTER_MODE, TR_KEY_filter_mode, CustomVariantType::FilterModeType },
    { FILTER_TRACKERS, TR_KEY_filter_trackers, QVariant::String },
    { FILTER_TEXT, TR_KEY_filter_text, QVariant::String },
    { SESSION_IS_REMOTE, TR_KEY_remote_session_enabled, QVariant::Bool },
    { SESSION_REMOTE_HOST, TR_KEY_remote_session_host, QVariant::String },
    { SESSION_REMOTE_PORT, TR_KEY_remote_session_port, QVariant::Int },
    { SESSION_REMOTE_AUTH, TR_KEY_remote_session_requres_authentication, QVariant::Bool },
    { SESSION_REMOTE_USERNAME, TR_KEY_remote_session_username, QVariant::String },
    { SESSION_REMOTE_PASSWORD, TR_KEY_remote_session_password, QVariant::String },
    { COMPLETE_SOUND_COMMAND, TR_KEY_torrent_complete_sound_command, QVariant::String },
    { COMPLETE_SOUND_ENABLED, TR_KEY_torrent_complete_sound_enabled, QVariant::Bool },
    { USER_HAS_GIVEN_INFORMED_CONSENT, TR_KEY_user_has_given_informed_consent, QVariant::Bool },

    /* libtransmission settings */
    { ALT_SPEED_LIMIT_UP, TR_KEY_alt_speed_up, QVariant::Int },
    { ALT_SPEED_LIMIT_DOWN, TR_KEY_alt_speed_down, QVariant::Int },
    { ALT_SPEED_LIMIT_ENABLED, TR_KEY_alt_speed_enabled, QVariant::Bool },
    { ALT_SPEED_LIMIT_TIME_BEGIN, TR_KEY_alt_speed_time_begin, QVariant::Int },
    { ALT_SPEED_LIMIT_TIME_END, TR_KEY_alt_speed_time_end, QVariant::Int },
    { ALT_SPEED_LIMIT_TIME_ENABLED, TR_KEY_alt_speed_time_enabled, QVariant::Bool },
    { ALT_SPEED_LIMIT_TIME_DAY, TR_KEY_alt_speed_time_day, QVariant::Int },
    { BLOCKLIST_ENABLED, TR_KEY_blocklist_enabled, QVariant::Bool },
    { BLOCKLIST_URL, TR_KEY_blocklist_url, QVariant::String },
    { DSPEED, TR_KEY_speed_limit_down, QVariant::Int },
    { DSPEED_ENABLED, TR_KEY_speed_limit_down_enabled, QVariant::Bool },
    { DOWNLOAD_DIR, TR_KEY_download_dir, QVariant::String },
    { DOWNLOAD_QUEUE_ENABLED, TR_KEY_download_queue_enabled, QVariant::Bool },
    { DOWNLOAD_QUEUE_SIZE, TR_KEY_download_queue_size, QVariant::Int },
    { ENCRYPTION, TR_KEY_encryption, QVariant::Int },
    { IDLE_LIMIT, TR_KEY_idle_seeding_limit, QVariant::Int },
    { IDLE_LIMIT_ENABLED, TR_KEY_idle_seeding_limit_enabled, QVariant::Bool },
    { INCOMPLETE_DIR, TR_KEY_incomplete_dir, QVariant::String },
    { INCOMPLETE_DIR_ENABLED, TR_KEY_incomplete_dir_enabled, QVariant::Bool },
    { MSGLEVEL, TR_KEY_message_level, QVariant::Int },
    { PEER_LIMIT_GLOBAL, TR_KEY_peer_limit_global, QVariant::Int },
    { PEER_LIMIT_TORRENT, TR_KEY_peer_limit_per_torrent, QVariant::Int },
    { PEER_PORT, TR_KEY_peer_port, QVariant::Int },
    { PEER_PORT_RANDOM_ON_START, TR_KEY_peer_port_random_on_start, QVariant::Bool },
    { PEER_PORT_RANDOM_LOW, TR_KEY_peer_port_random_low, QVariant::Int },
    { PEER_PORT_RANDOM_HIGH, TR_KEY_peer_port_random_high, QVariant::Int },
    { QUEUE_STALLED_MINUTES, TR_KEY_queue_stalled_minutes, QVariant::Int },
    { SCRIPT_TORRENT_DONE_ENABLED, TR_KEY_script_torrent_done_enabled, QVariant::Bool },
    { SCRIPT_TORRENT_DONE_FILENAME, TR_KEY_script_torrent_done_filename, QVariant::String },
    { SOCKET_TOS, TR_KEY_peer_socket_tos, QVariant::Int },
    { START, TR_KEY_start_added_torrents, QVariant::Bool },
    { TRASH_ORIGINAL, TR_KEY_trash_original_torrent_files, QVariant::Bool },
    { PEX_ENABLED, TR_KEY_pex_enabled, QVariant::Bool },
    { DHT_ENABLED, TR_KEY_dht_enabled, QVariant::Bool },
    { UTP_ENABLED, TR_KEY_utp_enabled, QVariant::Bool },
    { LPD_ENABLED, TR_KEY_lpd_enabled, QVariant::Bool },
    { PORT_FORWARDING, TR_KEY_port_forwarding_enabled, QVariant::Bool },
    { PREALLOCATION, TR_KEY_preallocation, QVariant::Int },
    { RATIO, TR_KEY_ratio_limit, QVariant::Double },
    { RATIO_ENABLED, TR_KEY_ratio_limit_enabled, QVariant::Bool },
    { RENAME_PARTIAL_FILES, TR_KEY_rename_partial_files, QVariant::Bool },
    { RPC_AUTH_REQUIRED, TR_KEY_rpc_authentication_required, QVariant::Bool },
    { RPC_ENABLED, TR_KEY_rpc_enabled, QVariant::Bool },
    { RPC_PASSWORD, TR_KEY_rpc_password, QVariant::String },
    { RPC_PORT, TR_KEY_rpc_port, QVariant::Int },
    { RPC_USERNAME, TR_KEY_rpc_username, QVariant::String },
    { RPC_WHITELIST_ENABLED, TR_KEY_rpc_whitelist_enabled, QVariant::Bool },
    { RPC_WHITELIST, TR_KEY_rpc_whitelist, QVariant::String },
    { USPEED_ENABLED, TR_KEY_speed_limit_up_enabled, QVariant::Bool },
    { USPEED, TR_KEY_speed_limit_up, QVariant::Int },
    { UPLOAD_SLOTS_PER_TORRENT, TR_KEY_upload_slots_per_torrent, QVariant::Int }
};

/***
****
***/

Prefs::Prefs(QString const& configDir) :
    myConfigDir(configDir)
{
    assert(sizeof(myItems) / sizeof(myItems[0]) == PREFS_COUNT);

#ifndef NDEBUG

    for (int i = 0; i < PREFS_COUNT; ++i)
    {
        assert(myItems[i].id == i);
    }

#endif

    // these are the prefs that don't get saved to settings.json
    // when the application exits.
    myTemporaryPrefs << FILTER_TEXT;

    tr_variant top;
    tr_variantInitDict(&top, 0);
    initDefaults(&top);
    tr_sessionLoadSettings(&top, myConfigDir.toUtf8().constData(), NULL);

    for (int i = 0; i < PREFS_COUNT; ++i)
    {
        double d;
        bool boolVal;
        int64_t intVal;
        char const* str;
        size_t strLen;
        tr_variant* b(tr_variantDictFind(&top, myItems[i].key));

        switch (myItems[i].type)
        {
        case QVariant::Int:
            if (tr_variantGetInt(b, &intVal))
            {
                myValues[i].setValue(static_cast<qlonglong>(intVal));
            }

            break;

        case CustomVariantType::SortModeType:
            if (tr_variantGetStr(b, &str, NULL))
            {
                myValues[i] = QVariant::fromValue(SortMode(QString::fromUtf8(str)));
            }

            break;

        case CustomVariantType::FilterModeType:
            if (tr_variantGetStr(b, &str, NULL))
            {
                myValues[i] = QVariant::fromValue(FilterMode(QString::fromUtf8(str)));
            }

            break;

        case QVariant::String:
            if (tr_variantGetStr(b, &str, &strLen))
            {
                myValues[i].setValue(QString::fromUtf8(str, strLen));
            }

            break;

        case QVariant::Bool:
            if (tr_variantGetBool(b, &boolVal))
            {
                myValues[i].setValue(static_cast<bool>(boolVal));
            }

            break;

        case QVariant::Double:
            if (tr_variantGetReal(b, &d))
            {
                myValues[i].setValue(d);
            }

            break;

        case QVariant::DateTime:
            if (tr_variantGetInt(b, &intVal))
            {
                myValues[i].setValue(QDateTime::fromTime_t(intVal));
            }

            break;

        default:
            assert("unhandled type" && 0);
            break;
        }
    }

    tr_variantFree(&top);
}

Prefs::~Prefs()
{
    // make a dict from settings.json
    tr_variant current_settings;
    tr_variantInitDict(&current_settings, PREFS_COUNT);

    for (int i = 0; i < PREFS_COUNT; ++i)
    {
        if (myTemporaryPrefs.contains(i))
        {
            continue;
        }

        tr_quark const key = myItems[i].key;
        QVariant const& val = myValues[i];

        switch (myItems[i].type)
        {
        case QVariant::Int:
            tr_variantDictAddInt(&current_settings, key, val.toInt());
            break;

        case CustomVariantType::SortModeType:
            tr_variantDictAddStr(&current_settings, key, val.value<SortMode>().name().toUtf8().constData());
            break;

        case CustomVariantType::FilterModeType:
            tr_variantDictAddStr(&current_settings, key, val.value<FilterMode>().name().toUtf8().constData());
            break;

        case QVariant::String:
            {
                QByteArray const ba(val.toByteArray());
                char const* s = ba.constData();

                if (Utils::isValidUtf8(s))
                {
                    tr_variantDictAddStr(&current_settings, key, s);
                }
                else
                {
                    tr_variantDictAddStr(&current_settings, key, val.toString().toUtf8().constData());
                }

                break;
            }

        case QVariant::Bool:
            tr_variantDictAddBool(&current_settings, key, val.toBool());
            break;

        case QVariant::Double:
            tr_variantDictAddReal(&current_settings, key, val.toDouble());
            break;

        case QVariant::DateTime:
            tr_variantDictAddInt(&current_settings, key, val.toDateTime().toTime_t());
            break;

        default:
            assert("unhandled type" && 0);
            break;
        }
    }

    // update settings.json with our settings
    tr_variant file_settings;
    QFile const file(QDir(myConfigDir).absoluteFilePath(QLatin1String("settings.json")));

    if (!tr_variantFromFile(&file_settings, TR_VARIANT_FMT_JSON, file.fileName().toUtf8().constData(), NULL))
    {
        tr_variantInitDict(&file_settings, PREFS_COUNT);
    }

    tr_variantMergeDicts(&file_settings, &current_settings);
    tr_variantToFile(&file_settings, TR_VARIANT_FMT_JSON, file.fileName().toUtf8().constData());
    tr_variantFree(&file_settings);

    // cleanup
    tr_variantFree(&current_settings);
}

/**
 * This is where we initialize the preferences file with the default values.
 * If you add a new preferences key, you /must/ add a default value here.
 */
void Prefs::initDefaults(tr_variant* d)
{
    tr_variantDictReserve(d, 38);
    tr_variantDictAddBool(d, TR_KEY_blocklist_updates_enabled, true);
    tr_variantDictAddBool(d, TR_KEY_compact_view, false);
    tr_variantDictAddBool(d, TR_KEY_inhibit_desktop_hibernation, false);
    tr_variantDictAddBool(d, TR_KEY_prompt_before_exit, true);
    tr_variantDictAddBool(d, TR_KEY_remote_session_enabled, false);
    tr_variantDictAddBool(d, TR_KEY_remote_session_requres_authentication, false);
    tr_variantDictAddBool(d, TR_KEY_show_backup_trackers, false);
    tr_variantDictAddBool(d, TR_KEY_show_extra_peer_details, false);
    tr_variantDictAddBool(d, TR_KEY_show_filterbar, true);
    tr_variantDictAddBool(d, TR_KEY_show_notification_area_icon, false);
    tr_variantDictAddBool(d, TR_KEY_start_minimized, false);
    tr_variantDictAddBool(d, TR_KEY_show_options_window, true);
    tr_variantDictAddBool(d, TR_KEY_show_statusbar, true);
    tr_variantDictAddBool(d, TR_KEY_show_toolbar, true);
    tr_variantDictAddBool(d, TR_KEY_show_tracker_scrapes, false);
    tr_variantDictAddBool(d, TR_KEY_sort_reversed, false);
    tr_variantDictAddBool(d, TR_KEY_torrent_added_notification_enabled, true);
    tr_variantDictAddBool(d, TR_KEY_torrent_complete_notification_enabled, true);
    tr_variantDictAddStr(d, TR_KEY_torrent_complete_sound_command,
        "canberra-gtk-play -i complete-download -d 'transmission torrent downloaded'");
    tr_variantDictAddBool(d, TR_KEY_torrent_complete_sound_enabled, true);
    tr_variantDictAddBool(d, TR_KEY_user_has_given_informed_consent, false);
    tr_variantDictAddBool(d, TR_KEY_watch_dir_enabled, false);
    tr_variantDictAddInt(d, TR_KEY_blocklist_date, 0);
    tr_variantDictAddInt(d, TR_KEY_main_window_height, 500);
    tr_variantDictAddInt(d, TR_KEY_main_window_width, 300);
    tr_variantDictAddInt(d, TR_KEY_main_window_x, 50);
    tr_variantDictAddInt(d, TR_KEY_main_window_y, 50);
    tr_variantDictAddInt(d, TR_KEY_remote_session_port, atoi(TR_DEFAULT_RPC_PORT_STR));
    tr_variantDictAddStr(d, TR_KEY_download_dir, tr_getDefaultDownloadDir());
    tr_variantDictAddStr(d, TR_KEY_filter_mode, "all");
    tr_variantDictAddStr(d, TR_KEY_main_window_layout_order, "menu,toolbar,filter,list,statusbar");
    tr_variantDictAddStr(d, TR_KEY_open_dialog_dir, QDir::home().absolutePath().toUtf8());
    tr_variantDictAddStr(d, TR_KEY_remote_session_host, "localhost");
    tr_variantDictAddStr(d, TR_KEY_remote_session_password, "");
    tr_variantDictAddStr(d, TR_KEY_remote_session_username, "");
    tr_variantDictAddStr(d, TR_KEY_sort_mode, "sort-by-name");
    tr_variantDictAddStr(d, TR_KEY_statusbar_stats, "total-ratio");
    tr_variantDictAddStr(d, TR_KEY_watch_dir, tr_getDefaultDownloadDir());
}

/***
****
***/

bool Prefs::getBool(int key) const
{
    assert(myItems[key].type == QVariant::Bool);
    return myValues[key].toBool();
}

QString Prefs::getString(int key) const
{
    assert(myItems[key].type == QVariant::String);
    QByteArray const b = myValues[key].toByteArray();

    if (Utils::isValidUtf8(b.constData()))
    {
        myValues[key].setValue(QString::fromUtf8(b.constData()));
    }

    return myValues[key].toString();
}

int Prefs::getInt(int key) const
{
    assert(myItems[key].type == QVariant::Int);
    return myValues[key].toInt();
}

double Prefs::getDouble(int key) const
{
    assert(myItems[key].type == QVariant::Double);
    return myValues[key].toDouble();
}

QDateTime Prefs::getDateTime(int key) const
{
    assert(myItems[key].type == QVariant::DateTime);
    return myValues[key].toDateTime();
}

/***
****
***/

void Prefs::toggleBool(int key)
{
    set(key, !getBool(key));
}