<?php

/**
 * 数据库连通性自检：只输出通/不通与来源文件名，绝不打印任何凭据。
 *
 * 环境重建后 mysql 容器换了名字，新后端 .env 里的账号密码可能已失效。
 * 这里依次拿几个项目的 .env 试连，用来定位到底哪套凭据还有效。
 *
 * 用法：php scripts/db-check.php
 */
$candidates = [
    'lgp-admin-plus-api/.env' => __DIR__ . '/../.env',
    'lgp-api/.env' => __DIR__ . '/../../lgp-api/.env',
    'lgp-wx-api/.env' => '/www/sites/lgp-wx-api/index/lgp-wx-api/.env',
];

function readEnv(string $path): array
{
    if (!is_file($path)) {
        return [];
    }
    $values = [];
    foreach (file($path, FILE_IGNORE_NEW_LINES | FILE_SKIP_EMPTY_LINES) as $line) {
        $line = trim($line);
        if ($line === '' || str_starts_with($line, '#') || !str_contains($line, '=')) {
            continue;
        }
        [$key, $value] = explode('=', $line, 2);
        $values[trim($key)] = trim(trim($value), "\"'");
    }
    return $values;
}

$target = $argv[1] ?? null;

// 环境重建后 host 也可能变了，所以每套凭据都对「自带 host」和「当前 mysql 容器」各试一次
$hosts = ['mysql8'];

foreach ($candidates as $label => $path) {
    $env = readEnv($path);
    if (empty($env)) {
        echo str_pad($label, 32) . " 文件不存在\n";
        continue;
    }
    $envHost = $env['DB_HOST'] ?? '127.0.0.1';
    foreach (array_unique([$envHost, ...$hosts]) as $host) {
    $port = $env['DB_PORT'] ?? '3306';
    $db = $target ?: ($env['DB_DATABASE'] ?? '');
    $user = $env['DB_USERNAME'] ?? 'root';
    try {
        $pdo = new PDO(
            "mysql:host={$host};port={$port};dbname={$db};charset=utf8mb4",
            $user,
            $env['DB_PASSWORD'] ?? '',
            [PDO::ATTR_ERRMODE => PDO::ERRMODE_EXCEPTION, PDO::ATTR_TIMEOUT => 5]
        );
        $count = $pdo->query('SELECT COUNT(*) FROM information_schema.tables WHERE table_schema = DATABASE()')->fetchColumn();
        echo str_pad($label, 32) . " 可连接  host={$host} db={$db} 表数={$count}\n";
    } catch (Throwable $e) {
        $reason = preg_replace('/using password: (YES|NO)/', 'using password: ***', $e->getMessage());
        echo str_pad($label, 32) . " 连不上  host={$host}  " . $reason . "\n";
    }
    }
}