/**
 * Restrict a value to a safe CSS px or % dimension for use in inline styles.
 * Bare numbers get px appended (e.g. 640 -> 640px). Percentages keep %.
 */
function sp_sanitize_css_dimension($value) {
    $value = trim((string) $value);
    if ($value === '') {
        return '';
    }
    // Percentages: 0-99% or exactly 100%. Pixels: up to 5 digits.
    if (preg_match('/^(\d{1,2}|100)%$/', $value, $matches)) {
        return $matches[1] . '%';
    }
    if (preg_match('/^(\d{1,5})(?:px)?$/i', $value, $matches)) {
        return $matches[1] . 'px';
    }

    return '';
}

/**
 * Return whether a parsed URL host is a ScreenPal player host we may iframe.
 * The host is checked on its own, not as a substring of the raw URL.
 */
function sp_is_allowed_oembed_host($host) {
    $host = strtolower((string) $host);
    // Apex or any subdomain, for example go.screenpal.com.
    if ($host === 'screenpal.com' || preg_match('/\A(?:[a-z0-9-]+\.)+screenpal\.com\z/', $host)) {
        return true;
    }
    // Apex or any subdomain of screencasthost.com, for example example.screencasthost.com.
    if ($host === 'screencasthost.com' || preg_match('/\A(?:[a-z0-9-]+\.)+screencasthost\.com\z/', $host)) {
        return true;
    }

    return false;
}

/**
 * Force WordPress oEmbed for a ScreenPal URL inside Themify Builder text modules.
 * Usage:
 * [sp_oembed url="https://go.screenpal.com/player/XXXX" width="640" height="360"]
 * [sp_oembed url="https://screenpal.com/player/XXXX"]
 * [sp_oembed url="https://example.screencasthost.com/player/XXXX"]
 *
 * width / height control the iframe size (px or %; bare numbers -> px) — not player
 * URL query params. Defaults keep prior behavior: width 100%, height unset so the
 * parent (e.g. .post-video) can manage aspect ratio. Height is not defaulted to 100%
 * because % height only works when the parent has an explicit height and often
 * collapses the embed otherwise.
 */
function sp_oembed_shortcode($atts) {
    $atts = shortcode_atts(
        [
            'url'    => '',
            'wrap'   => '1',
            'width'  => '100%',
            'height' => '',
        ],
        $atts,
        'sp_oembed'
    );

    $url = html_entity_decode(trim($atts['url']));
    if (!$url) return '';

    $parsed = wp_parse_url($url);
    $host   = !empty($parsed['host']) ? strtolower($parsed['host']) : '';
    $path   = isset($parsed['path']) ? $parsed['path'] : '';

    // ScreenPal URLs need custom embed handling because WordPress oEmbed
    // sandboxes the iframe and returns a simplified player that breaks
    // some features, such as audio descriptions and control visibility.
    if (
        sp_is_allowed_oembed_host($host)
        && preg_match('#^/(?:player|watch)/([A-Za-z0-9]+)#i', $path, $matches)
    ) {
        $id = $matches[1];

        $params = [];
        if (!empty($parsed['query'])) {
            parse_str($parsed['query'], $params);
            unset($params['width'], $params['height']);
        }

        $params['embedPreview'] = '1';

        if (!isset($params['dcc'])) {
            $params['dcc'] = '1';
        }

        $query = http_build_query($params);

        $width  = sp_sanitize_css_dimension($atts['width']);
        $height = sp_sanitize_css_dimension($atts['height']);
        if ($width === '') {
            $width = '100%';
        }

        $style = 'width:' . esc_attr($width) . ';border:0;';
        if ($height !== '') {
            $style .= 'height:' . esc_attr($height) . ';';
        }

        $html = '<iframe src="' . esc_url('https://' . $host . '/player/' . rawurlencode($id) . ($query ? '?' . $query : '')) . '" title="ScreenPal video Player" style="' . $style . '" scrolling="no" allow="autoplay; fullscreen *;" allowfullscreen></iframe>';

        return $atts['wrap'] === '1' ? '<div class="post-video">' . $html . '</div>' : $html;
    }

    $html = wp_oembed_get($url);
    if (!$html) {
        return '';
    }

    return $atts['wrap'] === '1' ? '<div class="post-video">' . $html . '</div>' : $html;
}
add_shortcode('sp_oembed', 'sp_oembed_shortcode');