/******************************************************************************
 * Copyright (c) Transmission authors and contributors
 *
 * Permission is hereby granted, free of charge, to any person obtaining a
 * copy of this software and associated documentation files (the "Software"),
 * to deal in the Software without restriction, including without limitation
 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
 * and/or sell copies of the Software, and to permit persons to whom the
 * Software is furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
 * DEALINGS IN THE SOFTWARE.
 *****************************************************************************/

#include <errno.h>
#include <stdio.h>
#include <stdlib.h> /* strtol() */
#include <string.h>
#include <string_view>

#include <unistd.h>

#include <glibmm.h>
#include <glibmm/i18n.h>

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

#include "Prefs.h"
#include "PrefsDialog.h"
#include "Utils.h"

#define MY_CONFIG_NAME "transmission"

using namespace std::literals;

std::string gl_confdir;

void gtr_pref_init(std::string const& config_dir)
{
    gl_confdir = config_dir;
}

/***
****
****  Preferences
****
***/

/**
 * 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.
 */
static void tr_prefs_init_defaults(tr_variant* d)
{
    auto dir = Glib::get_user_special_dir(Glib::USER_DIRECTORY_DOWNLOAD);

    if (dir.empty())
    {
        dir = Glib::get_user_special_dir(Glib::USER_DIRECTORY_DESKTOP);
    }

    if (dir.empty())
    {
        dir = tr_getDefaultDownloadDir();
    }

    tr_variantDictReserve(d, 31);
    tr_variantDictAddStr(d, TR_KEY_watch_dir, dir);
    tr_variantDictAddBool(d, TR_KEY_watch_dir_enabled, false);
    tr_variantDictAddBool(d, TR_KEY_user_has_given_informed_consent, false);
    tr_variantDictAddBool(d, TR_KEY_inhibit_desktop_hibernation, false);
    tr_variantDictAddBool(d, TR_KEY_blocklist_updates_enabled, true);
    tr_variantDictAddStr(d, TR_KEY_open_dialog_dir, Glib::get_home_dir());
    tr_variantDictAddBool(d, TR_KEY_show_toolbar, true);
    tr_variantDictAddBool(d, TR_KEY_show_filterbar, true);
    tr_variantDictAddBool(d, TR_KEY_show_statusbar, true);
    tr_variantDictAddBool(d, TR_KEY_trash_can_enabled, true);
    tr_variantDictAddBool(d, TR_KEY_show_notification_area_icon, false);
    tr_variantDictAddBool(d, TR_KEY_show_tracker_scrapes, false);
    tr_variantDictAddBool(d, TR_KEY_show_extra_peer_details, false);
    tr_variantDictAddBool(d, TR_KEY_show_backup_trackers, false);
    tr_variantDictAddStr(d, TR_KEY_statusbar_stats, "total-ratio"sv);
    tr_variantDictAddBool(d, TR_KEY_torrent_added_notification_enabled, true);
    tr_variantDictAddBool(d, TR_KEY_torrent_complete_notification_enabled, true);
    tr_variantDictAddBool(d, TR_KEY_torrent_complete_sound_enabled, true);
    tr_variantDictAddBool(d, TR_KEY_show_options_window, true);
    tr_variantDictAddBool(d, TR_KEY_main_window_is_maximized, false);
    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_details_window_height, 500);
    tr_variantDictAddInt(d, TR_KEY_details_window_width, 700);
    tr_variantDictAddStr(d, TR_KEY_download_dir, dir);
    tr_variantDictAddStr(d, TR_KEY_sort_mode, "sort-by-name"sv);
    tr_variantDictAddBool(d, TR_KEY_sort_reversed, false);
    tr_variantDictAddBool(d, TR_KEY_compact_view, false);
}

static void ensure_sound_cmd_is_a_list(tr_variant* dict)
{
    tr_quark key = TR_KEY_torrent_complete_sound_command;
    tr_variant* list = nullptr;
    if (tr_variantDictFindList(dict, key, &list))
    {
        return;
    }

    tr_variantDictRemove(dict, key);
    list = tr_variantDictAddList(dict, key, 5);
    tr_variantListAddStr(list, "canberra-gtk-play"sv);
    tr_variantListAddStr(list, "-i"sv);
    tr_variantListAddStr(list, "complete-download"sv);
    tr_variantListAddStr(list, "-d"sv);
    tr_variantListAddStr(list, "transmission torrent downloaded"sv);
}

static tr_variant* getPrefs()
{
    static tr_variant settings;
    static bool loaded = false;

    if (!loaded)
    {
        tr_variantInitDict(&settings, 0);
        tr_prefs_init_defaults(&settings);
        tr_sessionLoadSettings(&settings, gl_confdir.c_str(), MY_CONFIG_NAME);
        ensure_sound_cmd_is_a_list(&settings);
        loaded = true;
    }

    return &settings;
}

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

tr_variant* gtr_pref_get_all()
{
    return getPrefs();
}

int64_t gtr_pref_int_get(tr_quark const key)
{
    int64_t i;

    return tr_variantDictFindInt(getPrefs(), key, &i) ? i : 0;
}

void gtr_pref_int_set(tr_quark const key, int64_t value)
{
    tr_variantDictAddInt(getPrefs(), key, value);
}

double gtr_pref_double_get(tr_quark const key)
{
    double d;

    return tr_variantDictFindReal(getPrefs(), key, &d) ? d : 0.0;
}

void gtr_pref_double_set(tr_quark const key, double value)
{
    tr_variantDictAddReal(getPrefs(), key, value);
}

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

bool gtr_pref_flag_get(tr_quark const key)
{
    bool boolVal;

    return tr_variantDictFindBool(getPrefs(), key, &boolVal) ? boolVal : false;
}

void gtr_pref_flag_set(tr_quark const key, bool value)
{
    tr_variantDictAddBool(getPrefs(), key, value);
}

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

std::vector<std::string> gtr_pref_strv_get(tr_quark const key)
{
    std::vector<std::string> ret;

    tr_variant* list = nullptr;
    if (tr_variantDictFindList(getPrefs(), key, &list))
    {
        size_t const n = tr_variantListSize(list);
        ret.reserve(n);

        for (size_t i = 0; i < n; ++i)
        {
            char const* str = nullptr;
            size_t len = 0;
            if (tr_variantGetStr(tr_variantListChild(list, i), &str, &len))
            {
                ret.emplace_back(str, len);
            }
        }
    }

    return ret;
}

std::string gtr_pref_string_get(tr_quark const key)
{
    auto sv = std::string_view{};
    tr_variantDictFindStrView(getPrefs(), key, &sv);
    return std::string{ sv };
}

void gtr_pref_string_set(tr_quark const key, std::string const& value)
{
    tr_variantDictAddStr(getPrefs(), key, value);
}

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

void gtr_pref_save(tr_session* session)
{
    tr_sessionSaveSettings(session, gl_confdir.c_str(), getPrefs());
}