<?php
if ( ! defined( 'ABSPATH' ) ) { exit; }

class AIT_AIAA_Logger {

    public static function enabled() {
        return ! empty( AIT_AIAA_Settings::get( 'debug_logging' ) );
    }

    public static function log( $event, $data = array() ) {
        if ( ! self::enabled() ) { return; }

        if ( ! is_array( $data ) ) { $data = array( 'data' => $data ); }

        $data = self::redact( $data );

        $line = '[' . gmdate( 'Y-m-d\TH:i:s\Z' ) . '] [AIT AIAA] ' . sanitize_text_field( $event ) . ' | ' . wp_json_encode( $data );

        $written = self::write_to_upload_log( $line . "\n" );
        if ( ! $written ) {
            // Fallback to PHP error log if uploads isn't writable.
            error_log( rtrim( $line ) );
        }
    }

    private static function write_to_upload_log( $text ) {
        if ( ! function_exists( 'wp_upload_dir' ) ) { return false; }

        $uploads = wp_upload_dir();
        if ( empty( $uploads['basedir'] ) ) { return false; }

        $dir = trailingslashit( $uploads['basedir'] ) . 'ait-aiaa-logs';
        if ( ! wp_mkdir_p( $dir ) ) { return false; }

        $file = trailingslashit( $dir ) . 'ait-aiaa.log';

        // Append with lock to avoid interleaving.
        $result = @file_put_contents( $file, $text, FILE_APPEND | LOCK_EX );
        return ( false !== $result );
    }

    private static function redact( $data ) {
        $blocked_keys = array(
            'openai_api_key', 'api_key', 'authorization', 'Authorization',
            'page_source', 'outerHTML', 'html', 'document', 'raw_html',
        );

        $walker = function( $value ) use ( &$walker, $blocked_keys ) {
            if ( is_array( $value ) ) {
                $out = array();
                foreach ( $value as $k => $v ) {
                    if ( is_string( $k ) && in_array( $k, $blocked_keys, true ) ) {
                        $out[ $k ] = '[REDACTED]';
                        continue;
                    }
                    if ( is_string( $v ) && strlen( $v ) > 800 ) {
                        $v = substr( $v, 0, 800 ) . '…';
                    }
                    $out[ $k ] = $walker( $v );
                }
                return $out;
            }

            if ( is_string( $value ) && strlen( $value ) > 800 ) {
                return substr( $value, 0, 800 ) . '…';
            }

            return $value;
        };

        return $walker( $data );
    }
}