<?php
///////////////////////////////////////////////////////////////////////////

require_once 'lib/tv/tv.php';
require_once 'lib/tv/default_group.php';
require_once 'lib/tv/favorites_group.php';
require_once 'lib/tv/all_channels_group.php';

abstract class AbstractTv implements Tv
{
    const MODE_CHANNELS_1_TO_N = false;
    const MODE_CHANNELS_N_TO_M = true;

    ///////////////////////////////////////////////////////////////////////

    private $mode;
    private $favorites_supported;
    private $playback_url_is_stream_url;

    protected $channels;
    protected $groups;

    ///////////////////////////////////////////////////////////////////////

    protected function __construct($mode,
        $favorites_supported,
        $playback_url_is_stream_url)
    {
        $this->mode = $mode;
        $this->favorites_supported = $favorites_supported;
        $this->playback_url_is_stream_url = $playback_url_is_stream_url;
    }

    ///////////////////////////////////////////////////////////////////////

    public function is_favorites_supported()
    {
        return $this->favorites_supported;
    }

    public function get_all_channel_group_id()
    {
        return '__all_channels';
    }

    ///////////////////////////////////////////////////////////////////////

    public function unload_channels()
    {
        $channels = null;
        $groups = null;
    }

    protected abstract function load_channels(&$plugin_cookies);

    public function ensure_channels_loaded(&$plugin_cookies)
    {
      //  if (!isset($this->channels))
            $this->load_channels($plugin_cookies);
    }

    ///////////////////////////////////////////////////////////////////////

    public function get_channels()
    { return $this->channels; }

    ///////////////////////////////////////////////////////////////////////

    public function get_channel($channel_id)
    {
        $c = $this->channels->get($channel_id);

        if (is_null($c))
            throw new Exception("Unknown channel: $channel_id");

        return $c;
    }

    ///////////////////////////////////////////////////////////////////////

    public function get_groups()
    { return $this->groups; }

    ///////////////////////////////////////////////////////////////////////

    public function get_group($group_id)
    {
        $g = $this->groups->get($group_id);

        if (is_null($g))
            throw new Exception("Unknown group: $group_id");

        return $g;
    }

    ///////////////////////////////////////////////////////////////////////
    ///////////////////////////////////////////////////////////////////////

    public function get_tv_info(MediaURL $media_url, &$plugin_cookies)
    {
        $this->ensure_channels_loaded($plugin_cookies);

        $channels = array();

        foreach ($this->get_groups() as $g)
        {
            hd_print('DEBUG: group '.$g->get_id());
        }

        foreach ($this->get_channels() as $c)
        {
            $group_id_arr = array();

            if ($this->mode == self::MODE_CHANNELS_N_TO_M)
                $group_id_arr[] = $this->get_all_channel_group_id();

            foreach ($c->get_groups() as $g)
                $group_id_arr[] = $g->get_id();

            array_push($channels,
                array
                (
                    PluginTvChannel::id => $c->get_id(),
                    PluginTvChannel::caption => $c->get_title(),
                    PluginTvChannel::group_ids => $group_id_arr,
                    PluginTvChannel::icon_url => $c->get_icon_url(),
                    PluginTvChannel::number => $c->get_number(),

                    PluginTvChannel::have_archive => $c->has_archive(),
                    PluginTvChannel::is_protected => $c->is_protected(),

                    PluginTvChannel::past_epg_days => intval($c->get_past_epg_days()),
                    PluginTvChannel::future_epg_days => intval($c->get_future_epg_days()),

                    PluginTvChannel::archive_past_sec => intval($c->get_archive_past_sec()),
                    PluginTvChannel::archive_delay_sec => intval($c->get_archive_delay_sec()),

                    PluginTvChannel::buffering_ms => intval($c->get_buffering_ms()),
                    PluginTvChannel::timeshift_hours => intval($c->get_timeshift_hours()),

                    PluginTvChannel::playback_url_is_stream_url =>
                        $this->playback_url_is_stream_url,
                ));
        }

        $groups = array();

        foreach ($this->get_groups() as $g)
        {
            if ($g->is_favorite_channels())
                continue;

            if ($this->mode == self::MODE_CHANNELS_1_TO_N &&
                $g->is_all_channels())
            {
                continue;
            }

            array_push($groups,
                array
                (
                    PluginTvGroup::id => $g->get_id(),
                    PluginTvGroup::caption => $g->get_title(),
                    PluginTvGroup::icon_url => $g->get_icon_url()
                ));
        }

        $is_favorite_group = isset($media_url->is_favorites);
        $initial_group_id = strval($media_url->group_id);
        $initial_is_favorite = 0;

        if ($is_favorite_group)
        {
            $initial_group_id = null;
            $initial_is_favorite = 1;
        }

        if ($this->mode == self::MODE_CHANNELS_1_TO_N &&
            $initial_group_id === $this->get_all_channel_group_id())
        {
            $initial_group_id = null;
        }

        $fav_channel_ids = null;
        if ($this->is_favorites_supported())
            $fav_channel_ids = $this->get_fav_channel_ids($plugin_cookies);

        $archive = $this->get_archive($media_url);
        $archive_def = is_null($archive) ? null :
            $archive->get_archive_def();

        return array
        (
            PluginTvInfo::show_group_channels_only => $this->mode,

            PluginTvInfo::groups => $groups,
            PluginTvInfo::channels => $channels,

            PluginTvInfo::favorites_supported => $this->is_favorites_supported(),
            PluginTvInfo::favorites_icon_url => strval($this->get_fav_icon_url()),

            PluginTvInfo::initial_channel_id => strval($media_url->channel_id),
            PluginTvInfo::initial_group_id => $initial_group_id,

            PluginTvInfo::initial_is_favorite => $initial_is_favorite,
            PluginTvInfo::favorite_channel_ids => $fav_channel_ids,

            PluginTvInfo::archive => $archive_def,
        );
    }

    ///////////////////////////////////////////////////////////////////////

    public function get_tv_stream_url($media_url, &$plugin_cookies)
    { throw new Exception('Error: get_tv_stream_url() is not supported.'); }
    
    ///////////////////////////////////////////////////////////////////////

    public function get_tv_playback_url($channel_id, $archive_ts, $protect_code, &$plugin_cookies)
    {
        $this->ensure_channels_loaded($plugin_cookies);

        return $this->get_channel($channel_id)->get_streaming_url();
    }

    ///////////////////////////////////////////////////////////////////////

    protected abstract function get_day_epg_iterator($channel_id, $day_start_ts, &$plugin_cookies);

    ///////////////////////////////////////////////////////////////////////

    public function get_day_epg($channel_id, $day_start_ts, &$plugin_cookies)
    {
        $epg = array();

        foreach ($this->get_day_epg_iterator($channel_id, $day_start_ts, $plugin_cookies) as $e)
        {
            $epg[] =
                array
                (
                    PluginTvEpgProgram::start_tm_sec => $e->get_start_time(),
                    PluginTvEpgProgram::end_tm_sec => $e->get_finish_time(),
                    PluginTvEpgProgram::name => $e->get_title(),
                    PluginTvEpgProgram::description => $e->get_description()
                );
        }

        return $epg;
    }

    ///////////////////////////////////////////////////////////////////////
    ///////////////////////////////////////////////////////////////////////

    public function is_favorite_channel_id($channel_id, &$plugin_cookies)
    {
        if (!$this->is_favorites_supported())
            return false;

        $fav_channel_ids = $this->get_fav_channel_ids($plugin_cookies);

        $k = array_search($channel_id, $fav_channel_ids);

        return $k !== false;
    }

    public function change_tv_favorites($fav_op_type, $channel_id, &$plugin_cookies)
    {
        $fav_channel_ids = $this->get_fav_channel_ids($plugin_cookies);

        if ($fav_op_type === PLUGIN_FAVORITES_OP_ADD)
        {
            array_push($fav_channel_ids, $channel_id);
        }
        else if ($fav_op_type === PLUGIN_FAVORITES_OP_REMOVE)
        {
            $k = array_search($channel_id, $fav_channel_ids);

            if ($k !== false)
                unset ($fav_channel_ids[$k]);
        }
        else if ($fav_op_type === PLUGIN_FAVORITES_OP_MOVE_UP)
        {
            $k = array_search($channel_id, $fav_channel_ids);

            if ($k !== false && $k !== 0)
            {
                $t = $fav_channel_ids[$k - 1];
                $fav_channel_ids[$k - 1] = $fav_channel_ids[$k];
                $fav_channel_ids[$k] = $t;
            }
        }
        else if ($fav_op_type === PLUGIN_FAVORITES_OP_MOVE_DOWN)
        {
            $k = array_search($channel_id, $fav_channel_ids);

            if ($k !== false && $k !== count($fav_channel_ids) - 1)
            {
                $t = $fav_channel_ids[$k + 1];
                $fav_channel_ids[$k + 1] = $fav_channel_ids[$k];
                $fav_channel_ids[$k] = $t;
            }
        }

        $this->set_fav_channel_ids($plugin_cookies, $fav_channel_ids);

        return ActionFactory::invalidate_folders(
            array(TvFavoritesScreen::get_media_url_str()));
    }

    ///////////////////////////////////////////////////////////////////////

    public function get_fav_channel_ids(&$plugin_cookies)
    {
        $fav_channel_ids = array();

        if (isset($plugin_cookies->{'favorite_channels'}))
            $fav_channel_ids = preg_split('/,/', $plugin_cookies->{'favorite_channels'});

        return $fav_channel_ids;
    }

    ///////////////////////////////////////////////////////////////////////

    public function set_fav_channel_ids(&$plugin_cookies, &$ids)
    {
        $plugin_cookies->{'favorite_channels'} = join(',', $ids);
    }

    ///////////////////////////////////////////////////////////////////////
    // Archive.

    public function get_archive(MediaURL $media_url)
    { return null; }

    ///////////////////////////////////////////////////////////////////////
    // Hooks.

    public function folder_entered(MediaURL $media_url, &$plugin_cookies)
    { /* Nop */ }

    // Hook for adding special group items.
    public function add_special_groups(&$items)
    { /* Nop */ }
}

///////////////////////////////////////////////////////////////////////////
?>