<?php
date_default_timezone_set('Asia/Shanghai');
error_reporting(E_ALL);
ini_set('display_errors', 1);
/**
 * 主题 URL 重定向处理器 - 最终版
 * 功能：判断URL中的城市是否正确，正确则输出内容，错误则跳转
 */

define('ROOT_PATH', dirname(__FILE__));

$db_config = array(
    'host' => 'rm-2ze56e5tmkj3w96y2.mysql.rds.aliyuncs.com',
    'user' => 'jimdu',
    'pass' => 'Jimdu@912330',
    'name' => 'modoer'
);

$id = isset($_GET['id']) ? (int)$_GET['id'] : 0;
$city = isset($_GET['city']) ? trim($_GET['city']) : '';
$type = isset($_GET['type']) ? trim($_GET['type']) : 'pc';

if (!$id) {
    header('HTTP/1.0 404 Not Found');
    exit;
}

$cache_dir = ROOT_PATH . '/data/cache/redirect/';
if (!is_dir($cache_dir)) {
    mkdir($cache_dir, 0755, true);
}

$cache_file = $cache_dir . 'subject_' . $id . '.cache';

if (file_exists($cache_file) && (time() - filemtime($cache_file)) < 604800) {
    $subject = unserialize(file_get_contents($cache_file));
} else {
    try {
        $pdo = new PDO(
            "mysql:host={$db_config['host']};dbname={$db_config['name']};charset=utf8",
            $db_config['user'],
            $db_config['pass'],
            array(PDO::ATTR_ERRMODE => PDO::ERRMODE_EXCEPTION)
        );
        
        $stmt = $pdo->prepare("
            SELECT s.sid, s.city_id, COALESCE(ad.domain, 'quanguo') as city_domain
            FROM modoer_subject s
            LEFT JOIN modoer_area ad ON s.city_id = ad.aid
            WHERE s.sid = ? AND s.status = 1
            LIMIT 1
        ");
        $stmt->execute(array($id));
        $subject = $stmt->fetch(PDO::FETCH_ASSOC);
        
        file_put_contents($cache_file, serialize($subject));
    } catch (Exception $e) {
        error_log("redirect_subject.php DB Error: " . $e->getMessage());
        header('HTTP/1.0 500 Internal Server Error');
        exit;
    }
}

if (!$subject) {
    header('HTTP/1.0 404 Not Found');
    exit;
}

$sid = $subject['sid'];
$real_city = ($subject['city_id'] == 0) ? 'quanguo' : $subject['city_domain'];

// 生成规范URL
if ($type == 'mobile') {
    $canonical_url = "https://www.95ye.com/{$real_city}/gov/m/{$sid}.html";
} else {
    $canonical_url = "https://www.95ye.com/{$real_city}/gov/{$sid}.html";
}

// 判断当前URL中的城市是否与真实城市一致
if ($city == $real_city) {
    // 已经是正确URL，直接输出内容，不跳转
    $_GET['m'] = 'item';
    $_GET['act'] = ($type == 'mobile') ? 'mobile' : 'detail';
    $_GET['id'] = $sid;
    if ($type == 'mobile') {
        $_GET['do'] = 'detail';
    }
    if ($real_city != 'quanguo') {
        $_GET['city'] = $real_city;
    }
    
    include ROOT_PATH . '/index.php';
    exit;
}

// 城市不正确，301跳转到规范URL
header("HTTP/1.1 301 Moved Permanently");
header("Location: $canonical_url");
exit;
?>