<?php

declare(strict_types=1);

/**
 * Convert public video URLs into embeddable player URLs for the profile popup.
 */
final class Powr_Dir_Video
{
    /**
     * Returns an iframe-ready embed URL, or the original file URL for direct media.
     * Returns '' when the URL is empty or not recognized as embeddable.
     */
    public static function embed_url(?string $raw): string
    {
        $raw = trim((string) $raw);
        if ($raw === '') {
            return '';
        }

        if (self::is_direct_file($raw)) {
            return $raw;
        }

        $youtube = self::youtube_embed($raw);
        if ($youtube !== '') {
            return $youtube;
        }

        $vimeo = self::vimeo_embed($raw);
        if ($vimeo !== '') {
            return $vimeo;
        }

        return self::loom_embed($raw);
    }

    public static function is_direct_file(?string $raw): bool
    {
        $raw = trim((string) $raw);
        if ($raw === '') {
            return false;
        }

        $path = (string) (wp_parse_url($raw, PHP_URL_PATH) ?? '');
        $ext = strtolower((string) pathinfo($path, PATHINFO_EXTENSION));

        return in_array($ext, ['mp4', 'webm', 'ogg', 'mov'], true);
    }

    private static function youtube_embed(string $raw): string
    {
        $host = strtolower((string) (wp_parse_url($raw, PHP_URL_HOST) ?? ''));
        $host = preg_replace('/^www\./', '', $host) ?? $host;

        if (! in_array($host, ['youtube.com', 'm.youtube.com', 'youtu.be', 'youtube-nocookie.com'], true)) {
            return '';
        }

        $path = (string) (wp_parse_url($raw, PHP_URL_PATH) ?? '');
        $query = [];
        parse_str((string) (wp_parse_url($raw, PHP_URL_QUERY) ?? ''), $query);

        $id = '';
        if ($host === 'youtu.be') {
            $id = trim($path, '/');
            $id = explode('/', $id)[0] ?? '';
        } elseif (isset($query['v']) && is_string($query['v'])) {
            $id = $query['v'];
        } elseif (preg_match('#/(embed|shorts|live)/([A-Za-z0-9_-]{6,})#', $path, $m) === 1) {
            $id = $m[2];
        }

        if ($id === '' || preg_match('/^[A-Za-z0-9_-]{6,}$/', $id) !== 1) {
            return '';
        }

        $params = [
            'rel' => '0',
            'autoplay' => '1',
        ];

        $start = self::youtube_start($query);
        if ($start > 0) {
            $params['start'] = (string) $start;
        }

        return 'https://www.youtube.com/embed/' . $id . '?' . http_build_query($params);
    }

    /**
     * @param array<string, mixed> $query
     */
    private static function youtube_start(array $query): int
    {
        if (isset($query['start']) && is_numeric($query['start'])) {
            return max(0, (int) $query['start']);
        }

        $t = isset($query['t']) ? (string) $query['t'] : '';
        if ($t === '') {
            return 0;
        }

        if (is_numeric($t)) {
            return max(0, (int) $t);
        }

        $seconds = 0;
        if (preg_match('/(?:(\d+)h)?(?:(\d+)m)?(?:(\d+)s)?/', $t, $m) === 1) {
            $seconds += (int) ($m[1] ?? 0) * 3600;
            $seconds += (int) ($m[2] ?? 0) * 60;
            $seconds += (int) ($m[3] ?? 0);
        }

        return max(0, $seconds);
    }

    private static function vimeo_embed(string $raw): string
    {
        $host = strtolower((string) (wp_parse_url($raw, PHP_URL_HOST) ?? ''));
        $host = preg_replace('/^www\./', '', $host) ?? $host;

        if (! in_array($host, ['vimeo.com', 'player.vimeo.com'], true)) {
            return '';
        }

        $path = trim((string) (wp_parse_url($raw, PHP_URL_PATH) ?? ''), '/');
        $parts = array_values(array_filter(explode('/', $path), static fn (string $p): bool => $p !== ''));

        if ($host === 'player.vimeo.com') {
            if (($parts[0] ?? '') !== 'video' || ! isset($parts[1]) || ! ctype_digit($parts[1])) {
                return '';
            }
            $id = $parts[1];
            $hash = $parts[2] ?? '';
        } else {
            $skip = ['channels', 'groups', 'album', 'ondemand', 'showcase', 'event'];
            if (isset($parts[0]) && in_array($parts[0], $skip, true)) {
                return '';
            }
            if (! isset($parts[0]) || ! ctype_digit($parts[0])) {
                return '';
            }
            $id = $parts[0];
            $hash = isset($parts[1]) && preg_match('/^[a-f0-9]+$/i', $parts[1]) === 1 ? $parts[1] : '';
        }

        $params = ['autoplay' => '1'];
        $query = [];
        parse_str((string) (wp_parse_url($raw, PHP_URL_QUERY) ?? ''), $query);
        if ($hash === '' && isset($query['h']) && is_string($query['h'])) {
            $hash = $query['h'];
        }
        if ($hash !== '') {
            $params['h'] = $hash;
        }

        return 'https://player.vimeo.com/video/' . $id . '?' . http_build_query($params);
    }

    private static function loom_embed(string $raw): string
    {
        $host = strtolower((string) (wp_parse_url($raw, PHP_URL_HOST) ?? ''));
        $host = preg_replace('/^www\./', '', $host) ?? $host;

        if ($host !== 'loom.com') {
            return '';
        }

        $path = (string) (wp_parse_url($raw, PHP_URL_PATH) ?? '');
        if (preg_match('#/(share|embed)/([A-Za-z0-9]+)#', $path, $m) !== 1) {
            return '';
        }

        return 'https://www.loom.com/embed/' . $m[2];
    }
}