<?php

namespace support;

use Illuminate\Database\Capsule\Manager as Capsule;

class Db
{
    /**
     * @var Capsule
     */
    protected static $capsule = null;

    /**
     * 初始化
     */
    public static function init(): void
    {
        if (self::$capsule !== null) {
            return;
        }

        $config = config('database');
        $connections = $config['connections'] ?? [];

        self::$capsule = new Capsule();

        foreach ($connections as $name => $connection) {
            self::$capsule->addConnection($connection, $name);
        }

        self::$capsule->setAsGlobal();
        self::$capsule->bootEloquent();

        if ($default = $config['default'] ?? null) {
            self::$capsule->getDatabaseManager()->setDefaultConnection($default);
        }
    }

    /**
     * 获取连接
     */
    public static function connection(?string $name = null): \Illuminate\Database\Connection
    {
        if (self::$capsule === null) {
            self::init();
        }
        return self::$capsule->connection($name);
    }

    /**
     * 获取表查询构造器
     */
    public static function table(string $table, ?string $connection = null): \Illuminate\Database\Query\Builder
    {
        return self::connection($connection)->table($table);
    }

    /**
     * 原始SQL表达式
     */
    public static function raw(string $value): \Illuminate\Database\Query\Expression
    {
        return self::connection()->raw($value);
    }

    /**
     * 获取 Capsule 实例
     */
    public static function getCapsule(): Capsule
    {
        if (self::$capsule === null) {
            self::init();
        }
        return self::$capsule;
    }
}