<?php declare(strict_types = 1);
/**
 * PHP error output for HTTP headers.
 *
 * @package query-monitor
 */

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

class QM_Output_Headers_PHP_Errors extends QM_Output_Headers {

	/**
	 * Collector instance.
	 *
	 * @var QM_Collector_PHP_Errors Collector.
	 */
	protected $collector;

	/**
	 * @return array<string, mixed>
	 */
	public function get_output() {
		/** @var QM_Data_PHP_Errors $data */
		$data = $this->collector->get_data();
		$headers = array();

		if ( empty( $data->errors ) ) {
			return array();
		}

		$count = 0;

		foreach ( $data->errors as $error ) {
			$count++;

			$stack = isset( $error->trace ) ? $error->trace->get_stack() : array();
			$component = isset( $error->trace ) ? $error->trace->get_component()->name : '';
			$callsite = isset( $error->trace ) ? $error->trace->get_callsite() : null;

			$output_error = array(
				'level' => $error->level,
				'message' => $error->message,
				'file' => $callsite ? QM_Util::standard_dir( $callsite->file, '' ) : '',
				'line' => $callsite->line ?? null,
				'stack' => $stack,
				'component' => $component,
			);

			$key = sprintf( 'error-%d', $count );
			$headers[ $key ] = wp_json_encode( $output_error );
		}

		return array_merge(
			array(
				'count' => $count,
			),
			$headers
		);
	}

}

/**
 * @param array<string, QM_Output> $output
 * @param QM_Collectors $collectors
 * @return array<string, QM_Output>
 */
function register_qm_output_headers_php_errors( array $output, QM_Collectors $collectors ) {
	$collector = QM_Collectors::get( 'php_errors' );
	if ( $collector ) {
		$output['php_errors'] = new QM_Output_Headers_PHP_Errors( $collector );
	}
	return $output;
}

add_filter( 'qm/outputter/headers', 'register_qm_output_headers_php_errors', 110, 2 );