<?php

namespace Reservair\Logger;

class Logger {
    private const FILE = 'reservair.log';

    public static function info(string $message): void {
        self::write($message, 'info');
    }

    public static function warning(string $message): void {
        self::write($message, 'warning');
    }

    /** Accepts a Throwable so it can replace error_log($e) call sites directly. */
    public static function error(string|\Throwable $message): void {
        self::write($message instanceof \Throwable ? (string) $message : $message, 'error');
    }

    public static function get_path(): string {
        return self::dir() . '/' . self::FILE;
    }

    /** @return array<array{time: string, level: string, message: string}> Most-recent entry first. */
    public static function get_entries(): array {
        $path = self::get_path();
        if (!file_exists($path)) {
            return [];
        }

        $entries = [];
        foreach (file($path, FILE_IGNORE_NEW_LINES | FILE_SKIP_EMPTY_LINES) as $line) {
            $entry = json_decode($line, true);
            if ($entry !== null) {
                $entries[] = $entry;
            }
        }

        return array_reverse($entries);
    }

    public static function clear(): void {
        $path = self::get_path();
        if (file_exists($path)) {
            file_put_contents($path, '', LOCK_EX);
        }
    }

    private static function write(string $message, string $level): void {
        self::ensure_dir();
        $line = json_encode([
            'time'    => (new \DateTime('now', wp_timezone()))->format('Y-m-d H:i:s'),
            'level'   => $level,
            'message' => $message,
        ]);
        file_put_contents(self::get_path(), $line . PHP_EOL, FILE_APPEND | LOCK_EX);
    }

    private static function dir(): string {
        static $dir = null;
        if ($dir === null) {
            $dir = wp_upload_dir()['basedir'] . '/reservair';
        }
        return $dir;
    }

    private static function ensure_dir(): void {
        $dir = self::dir();
        if (!is_dir($dir)) {
            wp_mkdir_p($dir);
            // Block direct browser access to the log file.
            file_put_contents($dir . '/.htaccess', "Deny from all\n");
        }
    }
}