using Application.Exceptions;
using Microsoft.AspNetCore.Mvc.Filters;

namespace WebApi.Filters;

/// <summary>
/// 全局异常过滤器
/// </summary>
/// <remarks>
/// 统一处理Application层抛出的异常，转换为标准的BaseResponse格式
/// </remarks>
public class GlobalExceptionFilter(ILogger<GlobalExceptionFilter> logger) : IExceptionFilter
{
    public void OnException(ExceptionContext context)
    {
        BaseResponse response;
        var statusCode = 500;

        switch (context.Exception)
        {
            case ValidationException ex:
                // 业务验证失败 - 400 Bad Request
                logger.LogWarning(ex, "业务验证失败: {Message}", ex.Message);
                response = ex.Message.Fail();
                statusCode = 400;
                break;

            case NotFoundException ex:
                // 资源未找到 - 404 Not Found
                logger.LogWarning(ex, "资源未找到: {Message}", ex.Message);
                response = ex.Message.Fail();
                statusCode = 404;
                break;

            case BusinessException ex:
                // 业务逻辑异常 - 500 Internal Server Error
                logger.LogError(ex, "业务逻辑错误: {Message}", ex.Message);
                response = ex.Message.Fail();
                statusCode = 500;
                break;

            case Application.Exceptions.ApplicationException ex:
                // 应用层一般异常 - 500 Internal Server Error
                logger.LogError(ex, "应用层错误: {Message}", ex.Message);
                response = ex.Message.Fail();
                statusCode = 500;
                break;

            default:
                // 未处理的异常 - 500 Internal Server Error
                logger.LogError(context.Exception, "未处理的异常: {Message}", context.Exception.Message);
                response = "操作失败，请稍后重试".Fail();
                statusCode = 500;
                break;
        }

        context.Result = new ObjectResult(response)
        {
            StatusCode = statusCode
        };
        context.ExceptionHandled = true;
    }
}