<?php
/**
 * Premium TikTok Feed Handler.
 */

use PremiumAddons\Includes\Helper_Functions;

if ( ! defined( 'ABSPATH' ) ) {
	exit;
}

define( 'TIKTOK_API_URL', 'https://open.tiktokapis.com/v2/' );

/**
 * Get TikTok Data
 *
 * @param string $id         widget id.
 * @param array  $settings    widget settings.
 */
function get_tiktok_data( $id, $settings ) {

	$token = $settings['access_token'];

	$transient_name = sprintf( 'papro_tiktok_feed_%s_%s', $id, substr( $token, -8 ) );

	$response = get_transient( $transient_name );

	$is_edit_mode = \Elementor\Plugin::$instance->editor->is_edit_mode();

	if ( $is_edit_mode || false === $response ) {

		$filter_id = $settings['match_id'];

		$fields = '?fields=id,create_time,cover_image_url,share_url,video_description,duration,height,width,title,embed_html,embed_link,like_count,comment_count,share_count,view_count';

		$args = array(
			'headers' => array(
				'Authorization' => 'Bearer ' . $token,
				'Content-Type'  => 'application/json',
			),
		);

		if ( ! empty( $filter_id ) ) {

			$filters  = explode( ',', $filter_id );
			$endpoint = 'video/query/';

			$filters = array(
				'filters' => array(
					'video_ids' => $filters,
				),
			);

			$args['body'] = wp_json_encode( $filters );

		} else {
			$endpoint = 'video/list/';
			$limit    = $settings['no_of_posts'];

			if ( ! empty( $limit ) ) {
				$limit = array(
					'max_count' => $limit,
				);

				$args['body'] = wp_json_encode( $limit );
			}
		}

		$url = TIKTOK_API_URL . $endpoint . $fields;

		$response = wp_remote_post(
			$url,
			$args
		);

		if ( is_wp_error( $response ) ) {
			return;
		}

		$response = wp_remote_retrieve_body( $response );

		$response = json_decode( $response, true );

		if ( 'ok' !== $response['error']['code'] ) {
			?>
			<div class="premium-error-notice">
				<?php echo esc_html( __( 'Something went wrong: Code ', 'premium-addons-for-elementor' ) ) . $response['error']['code'] . ' => ' . $response['error']['message']; ?>
			</div>
			<?php
			return;
		}

		$transient = $settings['reload'];

		$expire_time = Helper_Functions::transient_expire( $transient );

		set_transient( $transient_name, $response, $expire_time );
	}

	$items = $response['data']['videos'];

	if ( empty( $filter_id ) ) {

		$device_type = Helper_Functions::get_device_type();

		if ( 'tablet' === $device_type && ! empty( $settings['no_of_posts_tablet'] ) ) {
			$items = array_slice( $items, 0, $settings['no_of_posts_tablet'] );
		} elseif ( 'mobile' === $device_type && ! empty( $settings['no_of_posts_mobile'] ) ) {
			$items = array_slice( $items, 0, $settings['no_of_posts_mobile'] );
		}
	}

	return $items;
}

/**
 * Get Profile Data.
 *
 * @param string $id         widget id.
 * @param array  $settings    widget settings.
 */
function get_tiktok_profile_data( $id, $settings ) {

	$token = $settings['access_token'];

	$transient_name = sprintf( 'papro_tiktok_profile_%s_%s', $id, substr( $token, -8 ) );

	$response = get_transient( $transient_name );

	if ( false === $response ) {

		$url = TIKTOK_API_URL . 'user/info/?fields=avatar_url,display_name,bio_description,profile_deep_link,is_verified,follower_count,following_count,likes_count';

		$response = wp_remote_get(
			$url,
			array(
				'headers' => array(
					'Authorization' => 'Bearer ' . $token,
				),
			)
		);

		if ( is_wp_error( $response ) ) {
			return 'error';
		}

		$response = wp_remote_retrieve_body( $response );

		$response = json_decode( $response, true );

		if ( 'ok' !== $response['error']['code'] ) {
			?>
			<div class="premium-error-notice">
				<?php echo esc_html( __( 'Something went wrong: Code ', 'premium-addons-for-elementor' ) ) . $response['error']['code'] . ' => ' . $response['error']['message']; ?>
			</div>
			<?php
			return 'error';
		}

		$transient = $settings['reload'];

		$expire_time = Helper_Functions::transient_expire( $transient );

		set_transient( $transient_name, $response, $expire_time );
	}

	return $response['data']['user'];
}

/**
 * Refresh TikTok Token.
 *
 * @param string $token old token.
 */
function refresh_tiktok_token( $token ) {

	$api_url = 'https://appfb.premiumaddons.com/wp-json/fbapp/v2/reftiktok/';

	$response = wp_remote_get(
		$api_url . $token,
		array(
			'timeout'   => 15,
			'sslverify' => true,
		)
	);

	$response = wp_remote_retrieve_body( $response );

	$response = json_decode( $response, true );

	set_transient( 'pa_tiktok_token_' . $token, $response, 23 * HOUR_IN_SECONDS );

	return $response;
}


/**
 * Refresh TikTok Token.
 *
 * @param string $token old token.
 */
function get_tiktok_videos_urls( $settings, $feed, $widget_id ) {

	$token = $settings['access_token'];

	$transient_name = sprintf( 'papro_tiktok_urls_%s_%s', substr( $token, -8 ), $widget_id );

	$response = get_transient( $transient_name );

	if ( false === $response ) {

		foreach ( $feed as $index => $video ) {

			$video_url = get_video_url( $video['share_url'] );

			download_tiktok_video( $video_url, $video['id'] );

		}

		$transient = Helper_Functions::transient_expire( $settings['reload'] );

		set_transient( $transient_name, true, $transient );

	}
}

function get_video_url( $url ) {

	$url = strtok( $url, '?' );

	$content = get_video_content( $url );

	$check = explode( '"playAddr":"', $content );

	if ( ! isset( $check[1] ) ) {
		return '';
	}

	$contentURL = explode( '"', $check[1] )[0];
	$contentURL = escape_sequence_decode( $contentURL );

	return $contentURL;
}

function escape_sequence_decode( $str ) {

	// [U+D800 - U+DBFF][U+DC00 - U+DFFF]|[U+0000 - U+FFFF]
	$regex = '/\\\u([dD][89abAB][\da-fA-F]{2})\\\u([dD][c-fC-F][\da-fA-F]{2})
              |\\\u([\da-fA-F]{4})/sx';

	return preg_replace_callback(
		$regex,
		function ( $matches ) {

			if ( isset( $matches[3] ) ) {
				$cp = hexdec( $matches[3] );
			} else {
				$lead  = hexdec( $matches[1] );
				$trail = hexdec( $matches[2] );

				// http://unicode.org/faq/utf_bom.html#utf16-4
				$cp = ( $lead << 10 ) + $trail + 0x10000 - ( 0xD800 << 10 ) - 0xDC00;
			}

			// https://tools.ietf.org/html/rfc3629#section-3
			// Characters between U+D800 and U+DFFF are not allowed in UTF-8
			if ( $cp > 0xD7FF && 0xE000 > $cp ) {
				$cp = 0xFFFD;
			}

			// https://github.com/php/php-src/blob/php-5.6.4/ext/standard/html.c#L471
			// php_utf32_utf8(unsigned char *buf, unsigned k)

			if ( $cp < 0x80 ) {
				return chr( $cp );
			} elseif ( $cp < 0xA0 ) {
				return chr( 0xC0 | $cp >> 6 ) . chr( 0x80 | $cp & 0x3F );
			}

			return html_entity_decode( '&#' . $cp . ';' );
		},
		$str
	);
}

function get_video_content( $url, $geturl = false ) {

	$ch = curl_init();

	$options = array(
		CURLOPT_URL            => $url,
		CURLOPT_RETURNTRANSFER => true,
		CURLOPT_HEADER         => false,
		CURLOPT_FOLLOWLOCATION => false, // Disable redirects
		CURLOPT_USERAGENT      => 'okhttp',
		CURLOPT_COOKIEJAR      => 'cookie.txt',
		CURLOPT_COOKIEFILE     => 'cookie.txt',
		CURLOPT_REFERER        => 'https://www.tiktok.com/',
		CURLOPT_SSL_VERIFYHOST => 2, // Enable SSL verification
		CURLOPT_SSL_VERIFYPEER => true, // Enable SSL verification
		CURLOPT_TIMEOUT        => 30,
		CURLOPT_MAXREDIRS      => 10,
	);

	curl_setopt_array( $ch, $options );

	if ( defined( 'CURLOPT_IPRESOLVE' ) && defined( 'CURL_IPRESOLVE_V4' ) ) {
		curl_setopt( $ch, CURLOPT_IPRESOLVE, CURL_IPRESOLVE_V4 );
	}

	$data = curl_exec( $ch );

	$httpcode = curl_getinfo( $ch, CURLINFO_HTTP_CODE );

	if ( $geturl === true ) {
		return curl_getinfo( $ch, CURLINFO_EFFECTIVE_URL );
	}

	curl_close( $ch );

	return strval( $data );
}

function download_tiktok_video( $video_url, $video_id, $geturl = false ) {

	// Validate video ID
	$video_id = validate_video_id( $video_id );
	if ( ! $video_id ) {
		return new WP_Error( 'invalid_video_id', 'Invalid video ID provided' );
	}

	// Validate URL
	if ( ! filter_var( $video_url, FILTER_VALIDATE_URL ) ) {
		return new WP_Error( 'invalid_url', 'Invalid video URL' );
	}

	// Only allow TikTok domains
	$parsed_url = parse_url( $video_url );

	if ( empty( $parsed_url['host'] ) ) {
		return false;
	}

	// return;
	if ( strpos( $parsed_url['host'], 'tiktok' ) === false ) {
		return new WP_Error( 'unauthorized_host', 'Unauthorized video host' );
	}

	$tiktok_dir = set_url_scheme( wp_upload_dir()['basedir'] . '/tiktok-videos' );

	if ( ! file_exists( $tiktok_dir ) ) {
		wp_mkdir_p( $tiktok_dir );
	}

	$ch      = curl_init();
	$options = array(
		CURLOPT_URL            => $video_url,
		CURLOPT_RETURNTRANSFER => true,
		CURLOPT_HEADER         => false,
		CURLOPT_FOLLOWLOCATION => false, // Disable redirects
		CURLOPT_USERAGENT      => 'okhttp',
		CURLOPT_COOKIEJAR      => 'cookie.txt',
		CURLOPT_COOKIEFILE     => 'cookie.txt',
		CURLOPT_REFERER        => 'https://www.tiktok.com/',
		CURLOPT_SSL_VERIFYHOST => 2, // Enable SSL verification
		CURLOPT_SSL_VERIFYPEER => true, // Enable SSL verification
		CURLOPT_TIMEOUT        => 30,
		CURLOPT_MAXFILESIZE    => 50 * 1024 * 1024, // 50MB limit
	);

	curl_setopt_array( $ch, $options );

	$data     = curl_exec( $ch );
	$httpcode = curl_getinfo( $ch, CURLINFO_HTTP_CODE );

	// if ( $httpcode !== 200 ) {
	// curl_close( $ch );
	// return new WP_Error( 'download_failed', 'Failed to download video' );
	// }

	if ( strlen( $data ) > 50 * 1024 * 1024 ) {
		curl_close( $ch );
		return new WP_Error( 'file_too_large', 'Video is larger than 50MB' );
	}

	curl_close( $ch );

	// Secure filename generation
	$filename = $tiktok_dir . '/' . basename( $video_id ) . '.mp4';

	// Use WordPress filesystem API
	global $wp_filesystem;
	if ( ! $wp_filesystem ) {
		require_once ABSPATH . 'wp-admin/includes/file.php';
		WP_Filesystem();
	}

	$result = $wp_filesystem->put_contents( $filename, $data, FS_CHMOD_FILE );

	if ( ! $result ) {
		return new WP_Error( 'file_write_failed', 'Failed to save video file' );
	}

	return $filename;
}

function validate_video_id( $video_id ) {

	// Only allow alphanumeric characters and hyphens
	if ( ! preg_match( '/^[a-zA-Z0-9_-]+$/', $video_id ) ) {
		return false;
	}

	// Limit length
	if ( strlen( $video_id ) > 50 ) {
		return false;
	}

	return sanitize_text_field( $video_id );
}
