<?php
header('Content-Type: text/html; charset=utf-8');
error_reporting(E_ALL);
ini_set('display_errors', 1);

$result = [];
$summary = [];
$importError = '';

if ($_SERVER['REQUEST_METHOD'] === 'POST') {
    if (isset($_FILES['import_file'])) {
        $file = $_FILES['import_file'];
        if ($file['error'] === UPLOAD_ERR_OK) {
            $handle = fopen($file['tmp_name'], 'r');
            if ($handle) {
                $urls = [];
                while (($line = fgets($handle)) !== false) {
                    $url = trim($line);
                    if (!empty($url)) $urls[] = $url;
                }
                fclose($handle);
                if (!empty($urls)) $_POST['urls'] = implode("\n", $urls);
                else $importError = '导入的文件为空或格式不正确';
            } else $importError = '无法打开上传的文件';
        } else $importError = '上传文件时出错: ' . $file['error'];
    }

    if (isset($_POST['urls'])) {
        $urls = explode("\n", $_POST['urls']);
        $urls = array_map('trim', $urls);
        $urls = array_filter($urls);
        if (!empty($urls)) {
            $result = checkUrls($urls);
            $summary['total'] = count($result);
            $summary['success'] = count(array_filter($result, function($item) {
                return $item['status'] === 'success';
            }));
            $summary['warning'] = count(array_filter($result, function($item) {
                return $item['status'] === 'warning';
            }));
            $summary['error'] = count(array_filter($result, function($item) {
                return $item['status'] === 'error';
            }));
        }
    }

    if (isset($_POST['export']) && !empty($result)) {
        $exportType = $_POST['export'];
        $filename = '网站检测结果_' . date('Ymd_His');
        if ($exportType === 'csv') {
            header('Content-Type: text/csv');
            header('Content-Disposition: attachment; filename="' . $filename . '.csv"');
            $output = fopen('php://output', 'w');
            fputcsv($output, ['序号', '网址', '状态', 'HTTP状态码', '响应时间(ms)', '内容大小(字节)', '检测时间']);
            foreach ($result as $index => $item) 
                fputcsv($output, [$index + 1, $item['url'], $item['status_text'], $item['http_code'], $item['response_time'], $item['content_length'], $item['timestamp']]);
            fclose($output);
            exit;
        } elseif ($exportType === 'json') {
            header('Content-Type: application/json');
            header('Content-Disposition: attachment; filename="' . $filename . '.json"');
            echo json_encode($result, JSON_PRETTY_PRINT | JSON_UNESCAPED_SLASHES | JSON_UNESCAPED_UNICODE);
            exit;
        }
    }
}

function checkUrls($urls) {
    $results = [];
    foreach ($urls as $url) {
        if (!preg_match('/^https?:\/\//', $url)) $url = 'http://' . $url;
        $results[] = checkUrlStatus($url);
    }
    return $results;
}

function checkUrlStatus($url) {
    $startTime = microtime(true);
    $ch = curl_init();
    curl_setopt($ch, CURLOPT_URL, $url);
    curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
    curl_setopt($ch, CURLOPT_HEADER, true);
    curl_setopt($ch, CURLOPT_NOBODY, true);
    curl_setopt($ch, CURLOPT_TIMEOUT, 10);
    curl_setopt($ch, CURLOPT_FOLLOWLOCATION, true);
    curl_setopt($ch, CURLOPT_MAXREDIRS, 3);
    curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, false);
    curl_setopt($ch, CURLOPT_SSL_VERIFYHOST, false);
    curl_setopt($ch, CURLOPT_USERAGENT, 'Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/91.0.4472.124 Safari/537.36');
    
    $response = curl_exec($ch);
    $httpCode = curl_getinfo($ch, CURLINFO_HTTP_CODE);
    $errno = curl_errno($ch);
    $error = curl_error($ch);
    $responseTime = round((microtime(true) - $startTime) * 1000, 2);
    $contentLength = curl_getinfo($ch, CURLINFO_CONTENT_LENGTH_DOWNLOAD);
    curl_close($ch);

    if ($errno !== 0) {
        $status = 'error';
        $statusText = '连接失败';
    } elseif ($httpCode >= 200 && $httpCode < 300) {
        $status = 'success';
        $statusText = '在线';
    } elseif ($httpCode >= 300 && $httpCode < 400) {
        $status = 'warning';
        $statusText = '重定向';
    } elseif ($httpCode >= 400 && $httpCode < 500) {
        $status = 'warning';
        $statusText = '客户端错误';
    } else {
        $status = 'error';
        $statusText = '服务器错误';
    }

    return [
        'url' => $url,
        'status' => $status,
        'status_text' => $statusText,
        'http_code' => $httpCode,
        'response_time' => $responseTime,
        'content_length' => $contentLength !== null ? $contentLength : 'N/A',
        'timestamp' => date('Y-m-d H:i:s'),
        'error_message' => $error
    ];
}
?>

<!DOCTYPE html>
<html lang="zh-CN">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>网站状态检测工具</title>
    <style>
        body {font-family:'Segoe UI',Tahoma,Geneva,Verdana,sans-serif;max-width:900px;margin:0 auto;padding:20px;background-color:#f8f9fa;}
        .container {background:white;padding:25px;border-radius:8px;box-shadow:0 2px 15px rgba(0,0,0,0.1);margin-bottom:20px;}
        h1 {color:#333;margin-top:0;}
        .form-group {margin-bottom:15px;}
        label {display:block;margin-bottom:5px;font-weight:500;}
        textarea {width:100%;height:150px;padding:10px;border:1px solid #ddd;border-radius:4px;resize:vertical;font-family:inherit;font-size:14px;}
        .btn {background-color:#4CAF50;color:white;padding:10px 15px;border:none;border-radius:4px;cursor:pointer;font-size:14px;margin-right:10px;transition:background-color 0.3s;}
        .btn:hover {background-color:#45a049;}
        .btn-secondary {background-color:#6c757d;}
        .btn-secondary:hover {background-color:#5a6268;}
        .btn-danger {background-color:#dc3545;}
        .btn-danger:hover {background-color:#c82333;}
        .btn-group {margin:15px 0;}
        .result-container {margin-top:25px;}
        .result-summary {margin-bottom:15px;padding:10px;background-color:#f1f8e9;border-radius:4px;font-size:14px;}
        .result-table {width:100%;border-collapse:collapse;margin-top:10px;}
        .result-table th,.result-table td {padding:10px;border:1px solid #ddd;text-align:left;}
        .result-table th {background-color:#f2f2f2;font-weight:600;}
        .status-success {color:#28a745;}
        .status-warning {color:#ffc107;}
        .status-error {color:#dc3545;}
        .import-error {color:#dc3545;margin:10px 0;padding:10px;background-color:#ffebee;border-radius:4px;}
        .export-options {margin-top:15px;display:flex;gap:10px;}
        @media (max-width:600px) {.btn {margin-bottom:10px;width:100%;}.export-options {flex-direction:column;}.result-table th,.result-table td {padding:8px;font-size:13px;}}
    </style>
</head>
<body>
    <div class="container">
        <h1>网站状态检测工具</h1>
        
        <form method="post" enctype="multipart/form-data">
            <div class="form-group">
                <label for="urls">输入网址（每行一个）:</label>
                <textarea id="urls" name="urls" placeholder="例如:
https://www.baidu.com
https://www.google.com
https://www.example.com"><?php echo isset($_POST['urls']) ? htmlspecialchars($_POST['urls']) : ''; ?></textarea>
            </div>
            
            <div class="btn-group">
                <button type="submit" class="btn">开始检测</button>
                
                <div class="import-group" style="display:inline-block;">
                    <label class="btn btn-secondary">
                        导入URL <input type="file" name="import_file" accept=".txt,.csv" style="display:none;">
                    </label>
                </div>
                
                <?php if (!empty($result)): ?>
                <div class="export-options">
                    <button type="submit" name="export" value="csv" class="btn btn-secondary">导出CSV</button>
                    <button type="submit" name="export" value="json" class="btn btn-secondary">导出JSON</button>
                </div>
                <?php endif; ?>
            </div>
            
            <?php if (!empty($importError)): ?>
            <div class="import-error"><?php echo $importError; ?></div>
            <?php endif; ?>
        </form>
        
        <?php if (!empty($result)): ?>
        <div class="result-container">
            <div class="result-summary">
                <strong>检测结果:</strong> 
                总计 <span class="status-success"><?php echo $summary['success']; ?></span> 个正常，
                <span class="status-warning"><?php echo $summary['warning']; ?></span> 个警告，
                <span class="status-error"><?php echo $summary['error']; ?></span> 个错误，共 <?php echo $summary['total']; ?> 个网站
            </div>
            
            <table class="result-table">
                <thead>
                    <tr>
                        <th>序号</th>
                        <th>网址</th>
                        <th>状态</th>
                        <th>HTTP状态码</th>
                        <th>响应时间</th>
                        <th>内容大小</th>
                        <th>检测时间</th>
                    </tr>
                </thead>
                <tbody>
                    <?php foreach ($result as $index => $item): ?>
                    <tr>
                        <td><?php echo $index + 1; ?></td>
                        <td><?php echo htmlspecialchars($item['url']); ?></td>
                        <td class="status-<?php echo $item['status']; ?>"><?php echo htmlspecialchars($item['status_text']); ?></td>
                        <td><?php echo $item['http_code']; ?></td>
                        <td><?php echo $item['response_time']; ?> ms</td>
                        <td><?php echo $item['content_length']; ?></td>
                        <td><?php echo $item['timestamp']; ?></td>
                    </tr>
                    <?php endforeach; ?>
                </tbody>
            </table>
        </div>
        <?php endif; ?>
    </div>
    
    <script>
        document.querySelector('input[name="import_file"]').addEventListener('change', function() {
            this.form.submit();
        });
    </script>
</body>
</html>