<?php
require_once __DIR__ . '/../config/config.php';

// Polyfill para PHP < 8
if (!function_exists('str_starts_with')) {
  function str_starts_with($haystack, $needle) {
    return $needle === '' ? true : strpos($haystack, $needle) === 0;
  }
}

class Utils {

  public static function boot(): void {
    // timezone
    $tz = defined('APP_TIMEZONE') ? APP_TIMEZONE : 'America/Sao_Paulo';
    @date_default_timezone_set($tz);

    // storage
    if (defined('STORAGE_DIR') && !is_dir(STORAGE_DIR)) {
      @mkdir(STORAGE_DIR, 0775, true);
    }

    // Handlers para garantir JSON até em erro fatal
    self::installHandlers();
  }

  public static function installHandlers(): void {
    // transforma notices/warnings em exceptions
    set_error_handler(function ($severity, $message, $file, $line) {
      if (!(error_reporting() & $severity)) return false;
      throw new ErrorException($message, 0, $severity, $file, $line);
    });

    // captura excepcões não tratadas
    set_exception_handler(function ($e) {
      self::log('[EXCEPTION] '.$e->getMessage().' @ '.$e->getFile().':'.$e->getLine());
      self::json(['ok'=>false, 'error'=>'fatal: '.$e->getMessage()], 500);
    });

    // captura erro fatal
    register_shutdown_function(function () {
      $err = error_get_last();
      if ($err && in_array($err['type'], [E_ERROR,E_PARSE,E_CORE_ERROR,E_COMPILE_ERROR])) {
        self::log('[SHUTDOWN] '.$err['message'].' @ '.$err['file'].':'.$err['line']);
        // tenta responder JSON (caso algo já tenha sido enviado, pode não funcionar, mas tentamos)
        if (!headers_sent()) {
          http_response_code(500);
          header('Content-Type: application/json; charset=utf-8');
        }
        echo json_encode([
          'ok' => false,
          'error' => 'fatal: '.$err['message'],
          'file' => $err['file'],
          'line' => $err['line']
        ], JSON_UNESCAPED_UNICODE|JSON_UNESCAPED_SLASHES);
      }
    });
  }

  public static function json($data, int $code = 200): void {
    if (!headers_sent()) {
      http_response_code($code);
      header('Content-Type: application/json; charset=utf-8');
    }
    echo json_encode($data, JSON_UNESCAPED_UNICODE | JSON_UNESCAPED_SLASHES);
    exit;
  }

  public static function requirePostJSON(): array {
    $raw = file_get_contents('php://input');
    $data = json_decode($raw, true);
    if (!is_array($data)) {
      self::json(['ok'=>false,'error'=>'Invalid JSON body'], 400);
    }
    return $data;
  }

  public static function storagePath(string $filename = ''): string {
    $base = defined('STORAGE_DIR') ? STORAGE_DIR : (__DIR__ . '/../storage');
    if (!is_dir($base)) {
      @mkdir($base, 0775, true);
    }
    return rtrim($base, '/').'/'.$filename;
  }

  public static function uuid(): string {
    return bin2hex(random_bytes(16));
  }

  public static function log(string $msg): void {
    $line = '['.date('c').'] '.$msg."\n";
    @file_put_contents(self::storagePath('error.log'), $line, FILE_APPEND);
  }
}