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

class PSIClient {
  private string $apiKey;

  public function __construct() {
    if (!defined('PSI_API_KEY') || PSI_API_KEY === '') {
      throw new Exception('PSI_API_KEY não configurado em config/config.php');
    }
    $this->apiKey = PSI_API_KEY;
  }

  private function buildUrl(string $url, string $strategy='mobile'): string {
    $base = "https://www.googleapis.com/pagespeedonline/v5/runPagespeed?url=$url";
    $params = http_build_query([
      'strategy' => $strategy,
      'key'      => $this->apiKey,
    ]);
    $cats = ['performance','accessibility','best-practices','seo'];
    $catsQuery = implode('&', array_map(fn($c) => 'category='.rawurlencode($c), $cats));
    return $base.'?'.$params.'&'.$catsQuery;
  }

  public function run(string $url, string $strategy='mobile'): array {
    $endpoint = $this->buildUrl($url, $strategy);

    // Preferimos cURL
    if (function_exists('curl_init')) {
      $ch = curl_init($endpoint);
      curl_setopt_array($ch, [
        CURLOPT_RETURNTRANSFER => true,
        CURLOPT_TIMEOUT        => 120,
        CURLOPT_HTTPHEADER     => ['User-Agent: FridayUp/1.0 (+https://www.wicomm.com.br)']
      ]);
      $res = curl_exec($ch);
      if ($res === false) {
        $err = curl_error($ch);
        curl_close($ch);
        throw new Exception('PSI request failed (cURL): '.$err);
      }
      $code = curl_getinfo($ch, CURLINFO_HTTP_CODE);
      curl_close($ch);
      $json = json_decode($res, true);
      if ($code >= 300 || !$json) {
        throw new Exception("PSI error HTTP $code: ".$res);
      }
      return $json;
    }

    // Fallback: file_get_contents (requer allow_url_fopen = On)
    if (!filter_var(ini_get('allow_url_fopen'), FILTER_VALIDATE_BOOLEAN)) {
      throw new Exception('Nenhum método HTTP disponível: cURL ausente e allow_url_fopen=Off');
    }
    $ctx = stream_context_create([
      'http' => [
        'method'  => 'GET',
        'timeout' => 60,
        'header'  => "User-Agent: FridayUp/1.0 (+https://www.wicomm.com.br)\r\n"
      ]
    ]);
    $res = @file_get_contents($endpoint, false, $ctx);
    if ($res === false) {
      $err = error_get_last();
      throw new Exception('PSI request failed (fopen): '.($err['message'] ?? 'unknown'));
    }
    $json = json_decode($res, true);
    if (!$json) {
      throw new Exception('PSI invalid JSON: '.$res);
    }
    return $json;
  }
}