<?php
/**
 * 自由云商城 · 安装向导
 * 步骤：1 环境检测 → 2 填写数据库/管理员 → 3 执行安装 → done 完成
 * 本文件为独立脚本，不依赖 config.php。
 */
session_start();

$step   = isset($_GET['step']) ? (string) $_GET['step'] : '1';
$force  = isset($_GET['force']);
$installed = file_exists(__DIR__ . '/config.php');

// 已安装且非强制重装：提示已安装
if ($installed && !$force && $step !== 'done') {
    showInstalled();
    exit;
}

// ====================== 步骤 3：执行安装 ======================
if ($step === '3' && $_SERVER['REQUEST_METHOD'] === 'POST') {
    $host      = trim($_POST['db_host'] ?? '');
    $port      = trim($_POST['db_port'] ?? '3306');
    $dbname    = trim($_POST['db_name'] ?? '');
    $dbuser    = trim($_POST['db_user'] ?? '');
    $dbpass    = $_POST['db_pass'] ?? '';
    $prefix    = trim($_POST['db_prefix'] ?? 'fnw_');
    $sitename  = trim($_POST['site_name'] ?? '自由云商城');
    $adminuser = trim($_POST['admin_user'] ?? '');
    $adminpass = $_POST['admin_pass'] ?? '';
    $adminpass2= $_POST['admin_pass2'] ?? '';
    $adminemail= trim($_POST['admin_email'] ?? '');

    $errors = [];
    if ($host === '')            $errors[] = '请填写数据库主机';
    if (!ctype_digit($port))    $errors[] = '端口必须为数字';
    if (!preg_match('/^[A-Za-z0-9_]+$/', $dbname)) $errors[] = '数据库名只能含字母、数字、下划线';
    if ($dbuser === '')         $errors[] = '请填写数据库用户名';
    if (!preg_match('/^[A-Za-z0-9_]+$/', $prefix)) $errors[] = '表前缀只能含字母、数字、下划线';
    if ($adminuser === '' || strlen($adminuser) < 3) $errors[] = '管理员账号至少 3 个字符';
    if (strlen($adminpass) < 6)                 $errors[] = '管理员密码至少 6 位';
    if ($adminpass !== $adminpass2)             $errors[] = '两次输入的密码不一致';
    if ($adminemail !== '' && !filter_var($adminemail, FILTER_VALIDATE_EMAIL)) $errors[] = '管理员邮箱格式不正确';

    if (empty($errors)) {
        try {
            // 1) 连接 MySQL（不含库名），创建数据库
            $opts = [
                PDO::ATTR_ERRMODE => PDO::ERRMODE_EXCEPTION,
                PDO::ATTR_DEFAULT_FETCH_MODE => PDO::FETCH_ASSOC,
                PDO::ATTR_EMULATE_PREPARES => false,
            ];
            $pdo = new PDO("mysql:host={$host};port={$port};charset=utf8mb4", $dbuser, $dbpass, $opts);
            $pdo->exec("CREATE DATABASE IF NOT EXISTS `{$dbname}` CHARACTER SET utf8mb4 COLLATE utf8mb4_unicode_ci");
            $pdo = new PDO("mysql:host={$host};port={$port};dbname={$dbname};charset=utf8mb4", $dbuser, $dbpass, $opts);

            // 2) 导入表结构与初始数据
            $sql = file_get_contents(__DIR__ . '/db.sql');
            $sql = preg_replace('/^--.*$/m', '', $sql);          // 去掉 -- 注释行
            $sql = str_replace('__PREFIX__', $prefix, $sql);
            $stmts = preg_split('/;\s*\n/', $sql);
            foreach ($stmts as $s) {
                $s = trim($s);
                if ($s === '') continue;
                $pdo->exec($s);
            }

            // 3) 创建管理员账号（同时生成唯一邀请码，避免 uk_invite_code 冲突）
            $hash = password_hash($adminpass, PASSWORD_DEFAULT);
            $adminCode = strtoupper(substr(md5(uniqid('admin', true)), 0, 8));
            $pdo->prepare("INSERT INTO `{$prefix}users` (username,password,email,invite_code,is_admin,role,created_at) VALUES (?,?,?,?,1,'admin',NOW())")
                ->execute([$adminuser, $hash, $adminemail, $adminCode]);

            // 4) 生成 config.php
            $cfg  = "<?php\n";
            $cfg .= "// 本文件由安装程序自动生成，请勿手动修改\n";
            $cfg .= "define('DB_HOST', "   . var_export($host, true) . ");\n";
            $cfg .= "define('DB_PORT', "   . var_export($port, true) . ");\n";
            $cfg .= "define('DB_NAME', "   . var_export($dbname, true) . ");\n";
            $cfg .= "define('DB_USER', "   . var_export($dbuser, true) . ");\n";
            $cfg .= "define('DB_PASS', "   . var_export($dbpass, true) . ");\n";
            $cfg .= "define('DB_PREFIX', " . var_export($prefix, true) . ");\n";
            $cfg .= "define('SITE_NAME', " . var_export($sitename, true) . ");\n";
            $cfg .= "define('SITE_KEY', "  . var_export(bin2hex(random_bytes(16)), true) . ");\n";
            $cfg .= "define('INSTALLED', true);\n";

            $cfgPath = __DIR__ . '/config.php';
            $written = @file_put_contents($cfgPath, $cfg);
            if ($written === false) {
                // 无法写入：提示手动保存
                showManualConfig($cfg);
                exit;
            }
            header('Location: install.php?step=done');
            exit;
        } catch (Throwable $e) {
            $errors[] = '安装失败：' . $e->getMessage();
        }
    }
    // 出错则回到表单（下方会渲染步骤 2 并显示错误）
    $step = '2';
}

// ====================== 视图渲染 ======================
$title = '自由云商城 · 安装向导';
$cssVer = file_exists(__DIR__ . '/assets/style.css') ? filemtime(__DIR__ . '/assets/style.css') : time();
?>
<!DOCTYPE html>
<html lang="zh-CN">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title><?= htmlspecialchars($title) ?></title>
    <link rel="stylesheet" href="assets/vendor/fontawesome/all.min.css">
    <link rel="stylesheet" href="assets/style.css?v=<?= $cssVer ?>">
    <style>
        .install-wrap{max-width:720px;margin:40px auto;}
        .install-card{background:var(--surface);border:1px solid var(--outline);border-radius:14px;padding:34px;box-shadow:0 10px 40px rgba(0,0,0,.12);}
        .install-card h1{color:var(--primary);font-size:1.6rem;margin-bottom:6px;}
        .install-sub{color:var(--muted);margin-bottom:22px;}
        .check-list{list-style:none;padding:0;margin:0 0 22px;}
        .check-list li{display:flex;align-items:center;gap:10px;padding:10px 12px;border:1px solid var(--outline);border-radius:8px;margin-bottom:8px;}
        .check-list .ok{color:#22c55e;}.check-list .bad{color:#ef4444;}
        .err-box{background:#fef2f2;border:1px solid #fecaca;color:#b91c1c;padding:12px 16px;border-radius:8px;margin-bottom:18px;}
        .err-box li{margin-left:18px;}
        .step-bar{display:flex;gap:8px;margin-bottom:24px;}
        .step-bar .s{flex:1;text-align:center;padding:8px;font-size:.85rem;border-radius:8px;background:var(--secondary);color:var(--muted);}
        .step-bar .s.active{background:var(--primary);color:#fff;}
        .form-grid{display:grid;grid-template-columns:1fr 1fr;gap:14px;margin-bottom:16px;}
        .form-grid label{display:flex;flex-direction:column;gap:6px;font-size:.9rem;color:var(--muted);}
        .form-grid input{padding:10px 12px;border:2px solid var(--outline);border-radius:8px;font-size:1rem;background:var(--bg);color:var(--text);font-family:inherit;}
        .form-grid .span2{grid-column:1 / -1;}
        @media (max-width:600px){.form-grid{grid-template-columns:1fr;}}
    </style>
</head>
<body data-theme="light">
<div class="install-wrap">
    <div class="install-card">
        <h1><i class="fas fa-store"></i> 自由云商城安装向导</h1>
        <div class="install-sub">只需几步，填写数据库信息即可完成安装。</div>
        <div class="step-bar">
            <div class="s <?= $step==='1'?'active':'' ?>">1. 环境检测</div>
            <div class="s <?= $step==='2'?'active':'' ?>">2. 数据库设置</div>
            <div class="s <?= $step==='3'||$step==='done'?'active':'' ?>">3. 完成</div>
        </div>

<?php if ($step === '1'): ?>
    <?php
        $checks = [
            ['PHP 版本 ≥ 7.0', version_compare(PHP_VERSION, '7.0.0', '>='), '当前版本 ' . PHP_VERSION],
            ['PDO 扩展', extension_loaded('pdo'), '用于数据库连接'],
            ['PDO_MYSQL 扩展', extension_loaded('pdo_mysql'), '用于 MySQL 连接'],
            ['config.php 可写', is_writable(__DIR__), '需对商城目录有写权限'],
        ];
        $allOk = true;
        foreach ($checks as $c) { if (!$c[1]) $allOk = false; }
    ?>
    <ul class="check-list">
        <?php foreach ($checks as $c): ?>
            <li>
                <i class="fas <?= $c[1] ? 'fa-check-circle ok' : 'fa-times-circle bad' ?>"></i>
                <span><strong><?= htmlspecialchars($c[0]) ?></strong> — <?= htmlspecialchars($c[2]) ?></span>
            </li>
        <?php endforeach; ?>
    </ul>
    <?php if ($allOk): ?>
        <a href="install.php?step=2" class="btn btn-primary" style="display:inline-block;padding:12px 22px;">下一步：填写数据库信息 →</a>
    <?php else: ?>
        <p class="err-box">请先满足上述环境要求（尤其启用 pdo_mysql 扩展，并确保目录可写）后再继续。</p>
    <?php endif; ?>

<?php elseif ($step === '2'): ?>
    <?php if (!empty($errors)): ?>
        <ul class="err-box"><?php foreach ($errors as $e): ?><li><?= htmlspecialchars($e) ?></li><?php endforeach; ?></ul>
    <?php endif; ?>
    <form method="post" action="install.php?step=3">
        <h3 style="margin:6px 0 12px;color:var(--primary)"><i class="fas fa-database"></i> 数据库信息</h3>
        <div class="form-grid">
            <label>数据库主机<input name="db_host" value="<?= htmlspecialchars($_POST['db_host'] ?? 'localhost') ?>" required></label>
            <label>端口<input name="db_port" value="<?= htmlspecialchars($_POST['db_port'] ?? '3306') ?>" required></label>
            <label>数据库名<input name="db_name" value="<?= htmlspecialchars($_POST['db_name'] ?? 'freenw_mall') ?>" required></label>
            <label>表前缀<input name="db_prefix" value="<?= htmlspecialchars($_POST['db_prefix'] ?? 'fnw_') ?>"></label>
            <label>数据库用户名<input name="db_user" value="<?= htmlspecialchars($_POST['db_user'] ?? 'root') ?>" required></label>
            <label>数据库密码<input type="text" name="db_pass" value="<?= htmlspecialchars($_POST['db_pass'] ?? '') ?>" placeholder="无密码可留空"></label>
        </div>
        <h3 style="margin:18px 0 12px;color:var(--primary)"><i class="fas fa-cog"></i> 站点与管理员</h3>
        <div class="form-grid">
            <label>站点名称<input name="site_name" value="<?= htmlspecialchars($_POST['site_name'] ?? '自由云商城') ?>"></label>
            <label>管理员账号<input name="admin_user" value="<?= htmlspecialchars($_POST['admin_user'] ?? '') ?>" placeholder="至少3位" required></label>
            <label>管理员密码<input type="password" name="admin_pass" placeholder="至少6位" required></label>
            <label>确认密码<input type="password" name="admin_pass2" required></label>
            <label style="grid-column:1/-1">管理员邮箱<input name="admin_email" value="<?= htmlspecialchars($_POST['admin_email'] ?? '') ?>" placeholder="选填"></label>
        </div>
        <button class="btn btn-primary" style="margin-top:18px;width:100%;padding:13px;">开始安装</button>
    </form>

<?php elseif ($step === 'done'): ?>
    <div style="text-align:center;padding:10px 0;">
        <i class="fas fa-check-circle" style="font-size:56px;color:#22c55e;"></i>
        <h2 style="margin:14px 0 6px;color:var(--primary)">安装成功！</h2>
        <p class="install-sub">数据库已创建、数据表与初始商品已写入，管理员账号已生成。</p>
        <div style="display:flex;gap:12px;justify-content:center;margin-top:18px;flex-wrap:wrap;">
            <a href="index.php" class="btn btn-primary" style="padding:12px 22px;">进入商城前台 →</a>
            <a href="admin/" class="btn btn-ghost" style="padding:12px 22px;">进入后台管理</a>
        </div>
        <p style="margin-top:18px;font-size:.85rem;color:var(--text-muted);">为安全起见，建议安装完成后删除或重命名 <code>install.php</code>。</p>
    </div>
<?php endif; ?>
    </div>
    <p style="text-align:center;color:var(--text-muted);font-size:.85rem;margin-top:14px;">自由云科技团队 · 公益技术团队</p>
</div>
</body>
</html>

<?php
// ====================== 辅助函数 ======================
function showInstalled() {
    ?>
    <!DOCTYPE html><html lang="zh-CN"><head><meta charset="UTF-8">
    <title>已安装</title>
    <link rel="stylesheet" href="assets/vendor/fontawesome/all.min.css">
    <link rel="stylesheet" href="assets/style.css?v=<?= filemtime(__DIR__ . '/assets/style.css') ?>"></head>
    <body data-theme="light"><div class="install-wrap"><div class="install-card">
        <h1><i class="fas fa-info-circle"></i> 商城已安装</h1>
        <p class="install-sub">检测到 <code>config.php</code> 已存在，无需重复安装。</p>
        <div style="display:flex;gap:12px;flex-wrap:wrap;">
            <a href="index.php" class="btn btn-primary" style="padding:12px 22px;">进入商城前台</a>
            <a href="admin/" class="btn btn-ghost" style="padding:12px 22px;">后台管理</a>
            <a href="install.php?step=1&force=1" class="btn btn-ghost" style="padding:12px 22px;">强制重新安装</a>
        </div>
        <p style="margin-top:16px;font-size:.85rem;color:var(--text-muted);">如需重新安装，请先删除 <code>config.php</code>，或点击「强制重新安装」。</p>
    </div></div></body></html>
    <?php
}

function showManualConfig($cfg) {
    ?>
    <!DOCTYPE html><html lang="zh-CN"><head><meta charset="UTF-8">
    <title>手动保存配置</title>
    <link rel="stylesheet" href="assets/vendor/fontawesome/all.min.css">
    <link rel="stylesheet" href="assets/style.css?v=<?= filemtime(__DIR__ . '/assets/style.css') ?>"></head>
    <body data-theme="light"><div class="install-wrap"><div class="install-card">
        <h1><i class="fas fa-exclamation-triangle"></i> 无法写入 config.php</h1>
        <p class="install-sub">数据库已初始化成功，但目录不可写。请手动创建 <code>mall/config.php</code> 并粘贴以下内容：</p>
        <textarea style="width:100%;height:240px;font-family:monospace;" readonly><?= htmlspecialchars($cfg) ?></textarea>
        <p style="margin-top:12px;font-size:.85rem;color:var(--text-muted);">保存后访问 <a href="index.php">index.php</a> 即可使用。</p>
    </div></div></body></html>
    <?php
}