<?php

namespace Podlove\AJAX;

use League\Csv\Writer;
use Podlove\Model;

class Ajax
{
    /**
     * Conventions:
     * - all actions must be prefixed with "podlove-"
     * - hyphens in actions are substituted for underscores in methods.
     */
    public function __construct()
    {
        $actions = [
            'get-new-guid',
            'validate-url',
            'update-asset-position',
            'update-feed-position',
            'podcast',
            'hide-teaser',
            'get-license-url',
            'get-license-name',
            'get-license-parameters-from-url',
            'analytics-downloads-per-day',
            'analytics-episode-downloads-per-hour',
            'analytics-total-downloads-per-day',
            'analytics-episode-average-downloads-per-hour',
            'analytics-settings-tiles-update',
            'analytics-settings-avg-update',
            'analytics-global-assets',
            'analytics-global-clients',
            'analytics-global-systems',
            'analytics-global-sources',
            'analytics-global-downloads-per-month',
            'analytics-global-top-episodes',
            'analytics-global-total-downloads',
            'analytics-global-total-downloads-by-show',
            'analytics-csv-episodes-table',
            'episode-slug',
            'admin-news',
            'job-create',
            'job-get',
            'job-delete',
            'jobs-get',
            'episode-next-number'
        ];

        // kickoff generic ajax methods
        foreach ($actions as $action) {
            add_action('wp_ajax_podlove-'.$action, [$this, str_replace('-', '_', $action)]);
        }

        // kickof specialized ajax controllers
        TemplateController::init();
        FileController::init();
    }

    public function episode_next_number()
    {
        $show_slug = filter_input(INPUT_GET, 'showSlug');
        $episode_id = filter_input(INPUT_GET, 'episodeId');

        $episode = Model\Episode::find_one_by_id($episode_id);

        self::respond_with_json([
            'number' => $episode->get_next_episode_number($show_slug)
        ]);
    }

    public function job_create()
    {
        $job_name = filter_input(INPUT_POST, 'name');
        $job_args = isset($_REQUEST['args']) && is_array($_REQUEST['args']) ? $_REQUEST['args'] : [];

        // check class exists
        if (!class_exists($job_name)) {
            self::respond_with_json(['error' => 'job "'.$job_name.'" does not exist']);
        }

        // check that class is a job
        if (!isset(class_uses($job_name)['Podlove\Jobs\JobTrait'])) {
            self::respond_with_json(['error' => '"'.$job_name.'" is not a job']);
        }

        $job = \Podlove\Jobs\CronJobRunner::create_job($job_name, $job_args);

        if ($job) {
            self::respond_with_json([
                'job_id' => $job->get_job_id(),
            ]);
        } else {
            self::respond_with_json(['error' => 'A job "'.$job_name.'" is already running']);
        }
    }

    public function job_get()
    {
        $job_id = filter_input(INPUT_GET, 'job_id');
        $job = \Podlove\Model\Job::find_by_id($job_id);

        if (!$job) {
            self::respond_with_json(['error' => 'no job with id "'.$job_id.'"']);
        }

        self::respond_with_json($job->to_array());
    }

    public function job_delete()
    {
        $job_id = filter_input(INPUT_GET, 'job_id');
        $job = \Podlove\Model\Job::find_by_id($job_id);

        if (!$job) {
            self::respond_with_json(['error' => 'no job with id "'.$job_id.'"']);
        }

        $job->delete();

        self::respond_with_json(['status' => 'ok']);
    }

    public function jobs_get()
    {
        $jobs = \Podlove\Model\Job::all();
        $jobs = array_map(function ($j) {
            $job = $j->to_array();

            $job_class = $job['class'];

            if (!class_exists($job_class)) {
                $job_class = str_replace('\\\\', '\\', $job_class);
            }

            $job['title'] = $job_class::title();
            // $job['description'] = $job_class::description();
            $job['mode'] = $job_class::mode(maybe_unserialize($job['args']));

            if ($job['steps_total'] > 0) {
                $steps_percent = floor(100 * ($job['steps_progress'] / $job['steps_total']));
                $job['steps_percent'] = $steps_percent < 100 ? $steps_percent : 100;
            } else {
                $job['steps_percent'] = 0;
            }

            $job['active_run_time'] = round($job['active_run_time'], 2);

            $job['created_relative'] = sprintf(__('%s ago'), human_time_diff(strtotime($job['created_at'])));
            $job['created_at_timestamp'] = strtotime($job['created_at']);

            if (!$job['wakeups'] || $job['created_at'] == $job['updated_at']) {
                $job['last_progress'] = __('Never');
            } else {
                $seconds = time() - strtotime($job['updated_at']);
                if ($seconds < 5) {
                    $job['last_progress'] = __('just now');
                } elseif ($seconds < 60) {
                    $job['last_progress'] = sprintf(__('%s sec ago'), $seconds);
                } else {
                    $job['last_progress'] = sprintf(__('%s ago'), human_time_diff(strtotime($job['updated_at'])));
                }
            }

            return $job;
        }, $jobs);

        self::respond_with_json($jobs);
    }

    public function admin_news()
    {
        require_once ABSPATH.'wp-admin/includes/dashboard.php';
        \Podlove\Settings\Dashboard\News::content();
        wp_die();
    }

    public function analytics_episode_average_downloads_per_hour()
    {
        global $wpdb;

        if (!current_user_can('podlove_read_analytics')) {
            exit;
        }

        $downloads = $wpdb->get_col("
			SELECT
				meta_value
			FROM
				{$wpdb->postmeta} pm
				JOIN {$wpdb->posts} p ON pm.post_id = p.ID
			WHERE
				pm.meta_key = '_podlove_eda_downloads'
				AND p.post_status IN ('publish', 'private')
			GROUP BY
				pm.post_id
		");

        $downloads = array_reduce($downloads, function ($agg, $item) {
            $row = explode(',', $item);

            // skip episodes with missing data, for example if released before tracking was started
            if (array_sum(array_slice($row, 0, 24)) < 10) {
                return $agg;
            }

            // skip young episodes
            if (count($row) < \Podlove\Analytics\EpisodeDownloadAverage::HOURS_TO_CALCULATE / 2) {
                return $agg;
            }

            if (empty($agg)) {
                $agg = $row;
            } else {
                for ($i = 0; $i < \Podlove\Analytics\EpisodeDownloadAverage::HOURS_TO_CALCULATE; ++$i) {
                    if (isset($row[$i])) {
                        $agg['downloads'][$i] += $row[$i];
                    }
                }
                ++$agg['rows'];
            }

            return $agg;
        }, ['downloads' => array_fill(0, \Podlove\Analytics\EpisodeDownloadAverage::HOURS_TO_CALCULATE, 0), 'rows' => 0]);

        $downloads = array_map(function ($item) use ($downloads) {
            return round($item / $downloads['rows']);
        }, $downloads['downloads']);

        $csv = '"downloads","hoursSinceRelease"'."\n";
        foreach ($downloads as $key => $value) {
            $csv .= "{$value},{$key}\n";
        }

        \Podlove\Feeds\check_for_and_do_compression('text/plain');
        echo $csv;
        ob_end_flush();

        exit;
    }

    public function analytics_downloads_per_day()
    {
        if (!current_user_can('podlove_read_analytics')) {
            exit;
        }

        \Podlove\Feeds\check_for_and_do_compression('text/plain');

        $episode_id = isset($_GET['episode']) ? (int) $_GET['episode'] : 0;

        $cache = \Podlove\Cache\TemplateCache::get_instance();
        echo $cache->cache_for('podlove_analytics_dpd_'.$episode_id, function () use ($episode_id) {
            global $wpdb;

            $episode_cond = '';
            if ($episode_id) {
                $episode_cond = " AND episode_id = {$episode_id}";
            }

            $sql = 'SELECT COUNT(*) downloads, post_title, access_date, episode_id, post_id
					FROM (
						SELECT
							media_file_id, accessed_at, DATE(accessed_at) access_date, episode_id
						FROM
							'.Model\DownloadIntent::table_name().' di
							INNER JOIN '.Model\MediaFile::table_name()." mf ON mf.id = di.media_file_id
						WHERE 1 = 1 {$episode_cond}
						GROUP BY media_file_id, request_id, access_date
					) di
                    INNER JOIN ".Model\Episode::table_name()." e ON episode_id = e.id
					INNER JOIN {$wpdb->posts} p ON e.post_id = p.ID
					WHERE accessed_at > p.post_date_gmt
					GROUP BY access_date, episode_id";

            $results = $wpdb->get_results($sql, ARRAY_N);

            $release_date = min(array_column($results, 2));

            $csv = '"downloads","title","date","episode_id","post_id","days"'."\n";
            foreach ($results as $row) {
                $row[1] = '"'.str_replace('"', '""', $row[1]).'"'; // quote & escape title
                $row[] = date_diff(date_create($release_date), date_create($row[2]))->format('%a');
                $csv .= implode(',', $row)."\n";
            }

            return $csv;
        }, 3600);

        exit;
    }

    public function analytics_episode_downloads_per_hour()
    {
        if (!current_user_can('podlove_read_analytics')) {
            exit;
        }

        $episode_id = isset($_GET['episode']) ? (int) $_GET['episode'] : 0;
        $cache_key = 'podlove_analytics_dphx_'.$episode_id;

        $locale = get_locale();
        $known_langs = ['de', 'en', 'es', 'fr', 'ja', 'pt-BR', 'ru', 'zh-CN'];

        $lang = 'en';
        foreach ($known_langs as $l) {
            if (stristr($locale, $l) !== false) {
                $lang = $l;

                break;
            }
        }

        $cache = \Podlove\Cache\TemplateCache::get_instance();
        $content = $cache->cache_for($cache_key, function () use ($episode_id, $lang) {
            global $wpdb;

            $sql = 'SELECT
						COUNT(*) downloads,
						UNIX_TIMESTAMP(accessed_at) AS access_date,
						hours_since_release,
						mf.episode_asset_id asset_id,
						client_name,
						os_name,
						source,
						context,
						geo.type as t1,
						geoname.name as tn1,
						geo_p.type as t2,
						geoname_p.name as tn2,
						geo_pp.type as t3,
						geoname_pp.name as tn3
					FROM
						'.Model\DownloadIntentClean::table_name().' di
						INNER JOIN '.Model\MediaFile::table_name().' mf ON mf.id = di.media_file_id
						LEFT JOIN '.Model\UserAgent::table_name().' ua ON ua.id = di.user_agent_id

						LEFT JOIN '.Model\GeoArea::table_name().' geo ON geo.id = di.`geo_area_id`
						LEFT JOIN '.Model\GeoArea::table_name().' geo_p ON geo_p.id = geo.parent_id
						LEFT JOIN '.Model\GeoArea::table_name().' geo_pp ON geo_pp.id = geo_p.parent_id
						LEFT JOIN '.Model\GeoAreaName::table_name()." geoname ON geoname.area_id = geo.`id` and geoname.language = \"{$lang}\"
						LEFT JOIN ".Model\GeoAreaName::table_name()." geoname_p ON geoname_p.area_id = geo_p.`id` and geoname_p.language = \"{$lang}\"
						LEFT JOIN ".Model\GeoAreaName::table_name()." geoname_pp ON geoname_pp.area_id = geo_pp.`id` and geoname_pp.language = \"{$lang}\"

						WHERE episode_id = {$episode_id}
						GROUP BY hours_since_release, asset_id, client_name, os_name, source, context";

            $results = $wpdb->get_results($sql, ARRAY_N);

            $csv = '"downloads","date","hours_since_release","asset_id","client","system","source","context","geo"'."\n";
            foreach ($results as $row) {
                $geos = [
                    ['type' => $row[8], 'name' => $row[9]],
                    ['type' => $row[10], 'name' => $row[11]],
                    ['type' => $row[12], 'name' => $row[13]],
                ];

                unset($row[8], $row[9], $row[10], $row[11], $row[12], $row[13]);

                $geo = array_filter($geos, function ($g) {
                    return $g['type'] == 'country';
                });

                if (count($geo)) {
                    $row[8] = reset($geo)['name'];
                } else {
                    $row[8] = '';
                }

                $row[4] = '"'.$row[4].'"';
                $row[5] = '"'.$row[5].'"';
                $row[8] = '"'.$row[8].'"';
                $csv .= implode(',', $row)."\n";
            }

            return $csv;
        }, 3600);

        $etag = md5($content);

        header("Etag: {$etag}");
        header('Last-Modified: '.gmdate('D, d M Y H:i:s', $cache->expiration_for($cache_key)).' GMT');

        $etagHeader = (isset($_SERVER['HTTP_IF_NONE_MATCH']) ? trim($_SERVER['HTTP_IF_NONE_MATCH']) : false);

        if ($etagHeader == $etag) {
            header('HTTP/1.1 304 Not Modified');

            exit;
        }

        \Podlove\Feeds\check_for_and_do_compression('text/plain');
        echo $content;
        ob_end_flush();

        exit;
    }

    public function analytics_total_downloads_per_day()
    {
        if (!current_user_can('podlove_read_analytics')) {
            exit;
        }

        $cache_key = 'podlove_analytics_tdphx';

        $cache = \Podlove\Cache\TemplateCache::get_instance();
        $content = $cache->cache_for($cache_key, function () {
            global $wpdb;

            $sql = "SELECT
			    COUNT(*) downloads,
			    UNIX_TIMESTAMP(accessed_at) AS access_date,
			    DATE_FORMAT(accessed_at, '%Y-%m-%d') AS date_day,
			    mf.episode_id
			FROM
			    ".Model\DownloadIntentClean::table_name().'  di
			    INNER JOIN '.Model\MediaFile::table_name()." mf ON mf.id = di.media_file_id
			WHERE accessed_at >= STR_TO_DATE('".date('Y-m-d', strtotime('-28 days'))."','%Y-%m-%d')
			GROUP BY date_day, episode_id
			";

            $results = $wpdb->get_results($sql, ARRAY_N);

            $csv = '"downloads","date","day","episode_id"'."\n";
            foreach ($results as $row) {
                $csv .= implode(',', $row)."\n";
            }

            return $csv;
        }, 3600);

        $etag = md5($content);

        header("Etag: {$etag}");
        header('Last-Modified: '.gmdate('D, d M Y H:i:s', $cache->expiration_for($cache_key)).' GMT');

        $etagHeader = (isset($_SERVER['HTTP_IF_NONE_MATCH']) ? trim($_SERVER['HTTP_IF_NONE_MATCH']) : false);

        if ($etagHeader == $etag) {
            header('HTTP/1.1 304 Not Modified');

            exit;
        }

        \Podlove\Feeds\check_for_and_do_compression('text/plain');
        echo $content;
        ob_end_flush();

        exit;
    }

    public static function analytics_settings_tiles_update()
    {
        if (!current_user_can('podlove_read_analytics')) {
            exit;
        }

        $tile_id = $_GET['tile_id'];
        $checked = isset($_GET['checked']) && $_GET['checked'] === 'checked';

        $option = get_option('podlove_analytics_tiles', []);
        $option[$tile_id] = $checked;
        update_option('podlove_analytics_tiles', $option);
    }

    public static function analytics_settings_avg_update()
    {
        if (!current_user_can('podlove_read_analytics')) {
            exit;
        }

        $checked = isset($_GET['checked']) && $_GET['checked'] === 'checked';
        update_option('podlove_analytics_compare_avg', $checked);
    }

    public static function analytics_csv_episodes_table()
    {
        if (!current_user_can('podlove_read_analytics')) {
            exit;
        }

        $data = \Podlove\Downloads_List_Data::get_data('post_date', 'asc');

        $writer = Writer::createFromFileObject(new \SplTempFileObject()); // the CSV file will be created into a temporary File

        $headers = array_keys($data[0]);
        $writer->insertOne($headers);

        $writer->insertAll($data);

        \Podlove\Feeds\check_for_and_do_compression('text/csv');
        header('Content-Disposition: attachment; filename=podlove-episode-downloads.csv');
        echo $writer;
        ob_end_flush();

        exit;
    }

    public static function respond_with_json($result)
    {
        header('Cache-Control: no-cache, must-revalidate');
        header('Expires: Mon, 26 Jul 1997 05:00:00 GMT');
        header('Content-type: application/json');
        echo json_encode($result);

        exit;
    }

    // SELECT
//     count(id) downloads,
//     source
    // FROM
//     wp_podlove_downloadintentclean
    // GROUP BY
//     source
    // ORDER BY
//     downloads DESC;

    // SELECT
//     count(id) downloads,
//     CONCAT(source, "/", context)
    // FROM
//     wp_podlove_downloadintentclean
    // GROUP BY
//     source,
//     context
    // ORDER BY
//     downloads DESC;

    // SELECT
//     count(di.id) downloads,
//     t.name
    // FROM
//     wp_podlove_downloadintentclean di
//     JOIN `wp_podlove_mediafile` f ON f.id = di.`media_file_id`
//     JOIN `wp_podlove_episodeasset` a ON a.id = f.`episode_asset_id`
//     JOIN `wp_podlove_filetype` t ON t.id = a.`file_type_id`
    // GROUP BY
//     t.id
    // ORDER BY
//     downloads DESC;

    public static function analytics_global_assets()
    {
        if (!current_user_can('podlove_read_analytics')) {
            exit;
        }

        \Podlove\Feeds\check_for_and_do_compression('text/plain');

        echo \Podlove\Cache\TemplateCache::get_instance()->cache_for('analytics_global_assets'.self::analytics_date_cache_key(), function () {
            global $wpdb;

            $downloads = $wpdb->get_results('
				SELECT
					count(di.id) downloads, t.name
				FROM
					'.Model\DownloadIntentClean::table_name().' di
					JOIN `'.Model\MediaFile::table_name().'` f ON f.id = di.`media_file_id`
					JOIN `'.Model\EpisodeAsset::table_name().'` a ON a.id = f.`episode_asset_id`
					JOIN `'.Model\FileType::table_name().'` t ON t.id = a.`file_type_id`
				WHERE 1 = 1 AND '.self::analytics_date_condition().'
				GROUP BY
					t.id
				ORDER BY
					downloads DESC;
			', ARRAY_N);

            $csv = Writer::createFromFileObject(new \SplTempFileObject());
            $csv->insertOne(['downloads', 'asset']);
            $csv->insertAll($downloads);

            return (string) $csv;
        });

        ob_end_flush();

        exit;
    }

    public static function analytics_global_clients()
    {
        if (!current_user_can('podlove_read_analytics')) {
            exit;
        }

        \Podlove\Feeds\check_for_and_do_compression('text/plain');

        echo \Podlove\Cache\TemplateCache::get_instance()->cache_for('analytics_global_clients'.self::analytics_date_cache_key(), function () {
            global $wpdb;

            $downloads = $wpdb->get_results('
				SELECT
						count(di.id) downloads,
						ua.client_name
				FROM
						'.Model\DownloadIntentClean::table_name().' di
						JOIN `'.Model\UserAgent::table_name().'` ua ON ua.id = di.`user_agent_id`
				WHERE 1 = 1 AND '.self::analytics_date_condition().'
				GROUP BY
						ua.client_name
				ORDER BY
						downloads DESC;
			', ARRAY_N);

            $csv = Writer::createFromFileObject(new \SplTempFileObject());
            $csv->insertOne(['downloads', 'client_name']);
            $csv->insertAll($downloads);

            return (string) $csv;
        });

        ob_end_flush();

        exit;
    }

    public static function analytics_global_sources()
    {
        if (!current_user_can('podlove_read_analytics')) {
            exit;
        }

        \Podlove\Feeds\check_for_and_do_compression('text/plain');

        echo \Podlove\Cache\TemplateCache::get_instance()->cache_for('analytics_global_sources'.self::analytics_date_cache_key(), function () {
            global $wpdb;

            $downloads = $wpdb->get_results('
				SELECT
						count(id) downloads,
						source
				FROM
						'.Model\DownloadIntentClean::table_name()."
				WHERE source IN ('feed', 'webplayer', 'download', 'opengraph') AND ".self::analytics_date_condition().'
				GROUP BY
						source
				ORDER BY
						downloads DESC
			', ARRAY_N);

            $csv = Writer::createFromFileObject(new \SplTempFileObject());
            $csv->insertOne(['downloads', 'source']);
            $csv->insertAll($downloads);

            return (string) $csv;
        });

        ob_end_flush();

        exit;
    }

    public static function analytics_global_systems()
    {
        if (!current_user_can('podlove_read_analytics')) {
            exit;
        }

        \Podlove\Feeds\check_for_and_do_compression('text/plain');

        echo \Podlove\Cache\TemplateCache::get_instance()->cache_for('analytics_global_systems'.self::analytics_date_cache_key(), function () {
            global $wpdb;

            $downloads = $wpdb->get_results('

				SELECT
						count(di.id) downloads,
						ua.os_name
				FROM
						'.Model\DownloadIntentClean::table_name().' di
						JOIN `'.Model\UserAgent::table_name().'` ua ON ua.id = di.`user_agent_id`
				WHERE 1 = 1 AND '.self::analytics_date_condition().'
				GROUP BY
						ua.`os_name`
				ORDER BY
						downloads DESC;
			', ARRAY_N);

            $csv = Writer::createFromFileObject(new \SplTempFileObject());
            $csv->insertOne(['downloads', 'os_name']);
            $csv->insertAll($downloads);

            return (string) $csv;
        });

        ob_end_flush();

        exit;
    }

    public static function analytics_global_downloads_per_month()
    {
        if (!current_user_can('podlove_read_analytics')) {
            exit;
        }

        \Podlove\Feeds\check_for_and_do_compression('text/plain');

        echo \Podlove\Cache\TemplateCache::get_instance()->cache_for('analytics_global_downloads_per_month'.self::analytics_date_cache_key(), function () {
            global $wpdb;

            $downloads = $wpdb->get_results("
				SELECT
						count(id),
						DATE_format(accessed_at, '%Y %m') date_month
				FROM
						".Model\DownloadIntentClean::table_name().' di
				WHERE 1 = 1 AND '.self::analytics_date_condition().'
				GROUP BY
						date_month
				ORDER BY
						date_month ASC
			', ARRAY_N);

            $csv = Writer::createFromFileObject(new \SplTempFileObject());
            $csv->insertOne(['downloads', 'date_month']);
            $csv->insertAll($downloads);

            return (string) $csv;
        });

        ob_end_flush();

        exit;
    }

    public static function analytics_global_total_downloads()
    {
        if (!current_user_can('podlove_read_analytics')) {
            exit;
        }

        echo \Podlove\Cache\TemplateCache::get_instance()->cache_for('analytics_global_downloads_total'.self::analytics_date_cache_key(), function () {
            global $wpdb;

            $downloads = $wpdb->get_var('
				SELECT count(id)
				FROM   '.Model\DownloadIntentClean::table_name().' di
				WHERE  '.self::analytics_date_condition().'
			');

            return number_format_i18n($downloads);
        });

        exit;
    }

    public static function analytics_global_total_downloads_by_show()
    {
        if (!current_user_can('podlove_read_analytics')) {
            exit;
        }

        echo \Podlove\Cache\TemplateCache::get_instance()->cache_for('analytics_global_show_downloads'.self::analytics_date_cache_key(), function () {
            $downloads = \Podlove\Model\DownloadIntentClean::total_downloads_by_show(self::analytics_date_condition());

            ob_start();

            include 'ajax.analytics_global_total_downloads_by_show.html.php';

            return ob_get_clean();
        });

        exit;
    }

    public static function analytics_global_top_episodes()
    {
        if (!current_user_can('podlove_read_analytics')) {
            exit;
        }

        \Podlove\Feeds\check_for_and_do_compression('text/plain');

        echo \Podlove\Cache\TemplateCache::get_instance()->cache_for('analytics_global_top_episodes'.self::analytics_date_cache_key(), function () {
            global $wpdb;

            $sql = '
				SELECT
						count(di.id) downloads,
						e.post_id,
						p.post_title
				FROM
						'.Model\DownloadIntentClean::table_name().' di
						INNER JOIN '.Model\MediaFile::table_name().' mf ON mf.id = di.media_file_id
						INNER JOIN '.Model\Episode::table_name().' e ON e.id = mf.`episode_id`
						INNER JOIN '.$wpdb->posts.' p ON p.`ID` = e.post_id
				WHERE 1 = 1 AND '.self::analytics_date_condition().'
				GROUP BY p.id
				ORDER BY downloads DESC
				LIMIT 10
			';

            $downloads = $wpdb->get_results($sql, ARRAY_N);

            $csv = Writer::createFromFileObject(new \SplTempFileObject());
            $csv->insertOne(['downloads', 'post_id', 'title']);
            $csv->insertAll($downloads);

            return (string) $csv;
        });

        ob_end_flush();

        exit;
    }

    public function podcast()
    {
        $podcast = Model\Podcast::get();
        $podcast_data = [];
        foreach ($podcast->property_names() as $property) {
            $podcast_data[$property] = $podcast->{$property};
        }

        self::respond_with_json($podcast_data);
    }

    public function get_new_guid()
    {
        $post_id = $_REQUEST['post_id'];

        $post = get_post($post_id);
        $guid = \Podlove\Custom_Guid::guid_for_post($post);

        self::respond_with_json(['guid' => $guid]);
    }

    public function validate_url()
    {
        if (!current_user_can('administrator')) {
            echo 'No permission';

            exit;
        }

        $file_url = $_REQUEST['file_url'];

        $info = \Podlove\Model\MediaFile::curl_get_header_for_url($file_url);
        $header = $info['header'];
        $reachable = $header['http_code'] >= 200 && $header['http_code'] < 300;

        $validation_cache = get_option('podlove_migration_validation_cache', []);
        $validation_cache[$file_url] = $reachable;
        update_option('podlove_migration_validation_cache', $validation_cache);

        self::respond_with_json([
            'file_url' => $file_url,
            'reachable' => $reachable,
            'file_size' => $header['download_content_length'],
        ]);
    }

    public function update_asset_position()
    {
        if (!current_user_can('administrator')) {
            echo 'No permission';

            exit;
        }

        $asset_id = (int) $_REQUEST['asset_id'];
        $position = (float) $_REQUEST['position'];

        Model\EpisodeAsset::find_by_id($asset_id)
            ->update_attributes(['position' => $position])
        ;

        exit;
    }

    public function update_feed_position()
    {
        if (!current_user_can('administrator')) {
            echo 'No permission';

            exit;
        }

        $feed_id = (int) $_REQUEST['feed_id'];
        $position = (float) $_REQUEST['position'];

        Model\Feed::find_by_id($feed_id)
            ->update_attributes(['position' => $position])
        ;

        exit;
    }

    public function hide_teaser()
    {
        update_option('_podlove_hide_teaser', true);
    }

    public function get_license_url()
    {
        self::respond_with_json(\Podlove\Model\License::get_url_from_license(self::parse_get_parameter_into_url_array()));
    }

    public function get_license_name()
    {
        self::respond_with_json(\Podlove\Model\License::get_name_from_license(self::parse_get_parameter_into_url_array()));
    }

    public function get_license_parameters_from_url()
    {
        self::respond_with_json(\Podlove\Model\License::get_license_from_url($_REQUEST['url']));
    }

    public function episode_slug()
    {
        echo sanitize_title($_REQUEST['title']);

        exit;
    }

    private static function analytics_date_condition()
    {
        $from = filter_input(INPUT_GET, 'date_from');
        $to = filter_input(INPUT_GET, 'date_to');

        if (!$from || !$to) {
            return '1 = 1';
        }

        $from = (new \DateTime($from))->setTime(0, 0, 0);
        $to = (new \DateTime($to))->setTime(23, 59, 59);

        if (!$from || !$to) {
            return '1 = 1';
        }

        return "(accessed_at >= \"{$from->format('Y-m-d H:i:s')}\" AND accessed_at <= \"{$to->format('Y-m-d H:i:s')}\")";
    }

    private static function analytics_date_cache_key()
    {
        $condition = self::analytics_date_condition();

        return sha1($condition);
    }

    private function parse_get_parameter_into_url_array()
    {
        return [
            'version' => $_REQUEST['version'],
            'modification' => $_REQUEST['modification'],
            'commercial_use' => $_REQUEST['commercial_use'],
            'jurisdiction' => $_REQUEST['jurisdiction'],
        ];
    }
}