<?php

namespace App\Exceptions;

use Illuminate\Foundation\Exceptions\Handler as ExceptionHandler;
use Throwable;

class Handler extends ExceptionHandler
{
    /**
     * A list of exception types with their corresponding custom log levels.
     *
     * @var array<class-string<\Throwable>, \Psr\Log\LogLevel::*>
     */
    protected $levels = [
        //
    ];

    /**
     * A list of the exception types that are not reported.
     *
     * @var array<int, class-string<\Throwable>>
     */
    protected $dontReport = [
        //
    ];

    /**
     * A list of the inputs that are never flashed to the session on validation exceptions.
     *
     * @var array<int, string>
     */
    protected $dontFlash = [
        'current_password',
        'password',
        'password_confirmation',
    ];

    /**
     * Register the exception handling callbacks for the application.
     *
     * @return void
     */
    public function register()
    {
        $this->reportable(function (Throwable $e) {
            //
        });
    }

    /**
     * 渲染异常为 HTTP 响应
     */
    public function render($request, Throwable $e)
    {
        // API 请求统一返回 JSON 格式
        if ($request->expectsJson() || $request->is('api/*')) {
            return $this->renderJsonException($e);
        }

        return parent::render($request, $e);
    }

    /**
     * 将异常渲染为 JSON 格式
     */
    protected function renderJsonException(Throwable $e): \Illuminate\Http\JsonResponse
    {
        // 根据异常类型返回不同的状态码和消息
        $statusCode = $this->getStatusCode($e);
        $errorCode = $this->getErrorCode($e);
        $message = $this->getErrorMessage($e);

        $response = [
            'code' => 1,
            'message' => $message,
            'errorCode' => $errorCode,
        ];

        // 开发环境返回调试信息
        if (config('app.debug')) {
            $response['debug'] = [
                'exception' => get_class($e),
                'file' => $e->getFile(),
                'line' => $e->getLine(),
                'trace' => $e->getTrace(),
            ];
        }

        return response()->json($response, $statusCode);
    }

    /**
     * 获取 HTTP 状态码
     */
    protected function getStatusCode(Throwable $e): int
    {
        if ($e instanceof NotFoundHttpException) {
            return 404;
        }

        if ($e instanceof ValidationException) {
            return 422;
        }

        if ($e instanceof TypeError) {
            return 400; // 参数类型错误
        }

        if ($e instanceof QueryException) {
            return 500;
        }

        // 如果异常有 getStatusCode 方法（如 Symfony 异常）
        if (method_exists($e, 'getStatusCode')) {
            return $e->getStatusCode();
        }

        return 500;
    }

    /**
     * 获取错误代码
     */
    protected function getErrorCode(Throwable $e): string
    {
        return match (true) {
            $e instanceof NotFoundHttpException => 'RESOURCE_NOT_FOUND',
            $e instanceof ValidationException => 'VALIDATION_ERROR',
            $e instanceof TypeError => 'TYPE_ERROR',
            $e instanceof QueryException => 'DATABASE_ERROR',
            default => 'INTERNAL_SERVER_ERROR',
        };
    }

    /**
     * 获取用户友好的错误消息
     */
    protected function getErrorMessage(Throwable $e): string
    {
        // 开发环境返回详细错误
        if (config('app.debug')) {
            return $e->getMessage();
        }

        // 生产环境返回友好消息
        return match (true) {
            $e instanceof NotFoundHttpException => '资源不存在',
            $e instanceof ValidationException => '数据验证失败',
            $e instanceof TypeError => '参数类型错误',
            $e instanceof QueryException => '数据库操作失败',
            default => '服务器内部错误，请稍后重试',
        };
    }
}