<?php
declare(strict_types=1);

/**
 * 解决宝塔面板备份偶发报错：
 * “备份文件中缺少表: xxx__view_backup”
 *
 * 原因通常是：数据库存在 VIEW，但宝塔的备份校验按“表”去匹配，
 * 或其内部会期望存在 xxx__view_backup 之类的“视图备份表”标记。
 *
 * 本脚本会：
 * - 扫描当前库所有 VIEW
 * - 为每个 VIEW 创建一个同名的备份表：<view_name>__view_backup
 * - 在该表写入 SHOW CREATE VIEW 的结果（若权限不足则写入空串）
 *
 * 用法（在 server 目录执行）：
 * php db/fix_bt_backup_view_tables.php
 */

require_once __DIR__ . '/../vendor/autoload.php';

if (class_exists(\Dotenv\Dotenv::class) && is_file(dirname(__DIR__) . '/.env')) {
    if (method_exists(\Dotenv\Dotenv::class, 'createUnsafeMutable')) {
        \Dotenv\Dotenv::createUnsafeMutable(dirname(__DIR__))->load();
    } else {
        \Dotenv\Dotenv::createMutable(dirname(__DIR__))->load();
    }
}

$host = getenv('DB_HOST') ?: '127.0.0.1';
$port = getenv('DB_PORT') ?: '3306';
$dbName = getenv('DB_NAME') ?: '';
$user = getenv('DB_USER') ?: '';
$pass = getenv('DB_PASSWORD') ?: '';

if ($dbName === '' || $user === '') {
    fwrite(STDERR, "Missing DB_NAME/DB_USER in .env\n");
    exit(1);
}

$dsn = "mysql:host={$host};port={$port};dbname={$dbName};charset=utf8mb4";
$pdo = new PDO($dsn, $user, $pass, [
    PDO::ATTR_ERRMODE => PDO::ERRMODE_EXCEPTION,
]);

$views = $pdo
    ->query("SELECT TABLE_NAME FROM information_schema.VIEWS WHERE TABLE_SCHEMA = DATABASE() ORDER BY TABLE_NAME")
    ->fetchAll(PDO::FETCH_COLUMN);

if (!$views) {
    echo "No views found; nothing to do.\n";
    exit(0);
}

$created = 0;
$updated = 0;
$failed = 0;

foreach ($views as $viewName) {
    $viewName = (string) $viewName;
    $backupTable = $viewName . '__view_backup';

    if (!preg_match('/^[a-zA-Z0-9_]+$/', $backupTable)) {
        $failed++;
        echo "[skip] invalid name: {$backupTable}\n";
        continue;
    }

    try {
        $pdo->exec(
            "CREATE TABLE IF NOT EXISTS `{$backupTable}` (
                `id` BIGINT UNSIGNED NOT NULL AUTO_INCREMENT,
                `view_name` VARCHAR(255) NOT NULL,
                `create_sql` LONGTEXT NOT NULL,
                `updated_at` DATETIME NOT NULL,
                PRIMARY KEY (`id`),
                UNIQUE KEY `uk_view_name` (`view_name`)
            ) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4"
        );
        $created++;
    } catch (Throwable $e) {
        $failed++;
        echo "[fail] create table {$backupTable}: " . $e->getMessage() . "\n";
        continue;
    }

    $createSql = '';
    try {
        $stmt = $pdo->query("SHOW CREATE VIEW `{$viewName}`");
        $row = $stmt ? $stmt->fetch(PDO::FETCH_ASSOC) : false;
        if ($row) {
            // SHOW CREATE VIEW 返回字段名可能是 "Create View" 或类似
            foreach ($row as $k => $v) {
                if (is_string($k) && stripos($k, 'create') !== false && is_string($v)) {
                    $createSql = $v;
                    break;
                }
            }
        }
    } catch (Throwable $e) {
        // 权限不足也不阻断，只是留空，保证备份表存在
        $createSql = '';
    }

    try {
        $stmt = $pdo->prepare(
            "INSERT INTO `{$backupTable}` (`view_name`, `create_sql`, `updated_at`)
             VALUES (:view_name, :create_sql, :updated_at)
             ON DUPLICATE KEY UPDATE
               `create_sql` = VALUES(`create_sql`),
               `updated_at` = VALUES(`updated_at`)"
        );
        $stmt->execute([
            'view_name' => $viewName,
            'create_sql' => $createSql,
            'updated_at' => date('Y-m-d H:i:s'),
        ]);
        $updated++;
        echo "[ok] {$viewName} -> {$backupTable}\n";
    } catch (Throwable $e) {
        $failed++;
        echo "[fail] upsert {$backupTable}: " . $e->getMessage() . "\n";
    }
}

echo "Done. created={$created}, updated={$updated}, failed={$failed}\n";