using Furion.DataValidation;
using Furion.DependencyInjection;
using Furion.UnifyResult;
using Furion.UnifyResult.Internal;
using Microsoft.AspNetCore.Http;
using Microsoft.AspNetCore.Mvc;
using Microsoft.AspNetCore.Mvc.Filters;
using Microsoft.AspNetCore.Mvc.ModelBinding;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace Waste.Web.Core
{
    /// <summary>
    /// RESTFUL 风格返回值
    /// </summary>
    [SuppressSniffer, UnifyModel(typeof(RESTfulResult<>))]
    public class RESTfulResultProvider : IUnifyResultProvider
    {

        /// <summary>
        /// 异常返回值
        /// </summary>
        /// <param name="context"></param>
        /// <param name="metadata"></param>
        /// <returns></returns>
        public IActionResult OnException(ExceptionContext context, ExceptionMetadata metadata)
        {
            //解析异常信息
            var ErrorCode = metadata.ErrorCode;
            var StatusCode = metadata.StatusCode;
            var Errors = metadata.Errors;
            object data;
            // 处理内容结果
            if (context.Result is ContentResult contentResult) data = contentResult.Content;
            // 处理对象结果
            else if (context.Result is ObjectResult objectResult) data = objectResult.Value;
            else if (context.Result is EmptyResult) data = null;
            else data= null;
            return new JsonResult(new RESTfulResult<object>
            {
                StatusCode = StatusCode,
                Succeeded = false,
                Data = data,
                Errors = Errors,
                Extras = UnifyContext.Take(),
                Timestamp = DateTimeOffset.UtcNow.ToUnixTimeMilliseconds()
            });
        }
        /// <summary>
        /// 处理输出状态码
        /// </summary>
        /// <param name="context"></param>
        /// <param name="statusCode"></param>
        /// <param name="unifyResultSettings"></param>
        /// <returns></returns>
        public async Task OnResponseStatusCodes(HttpContext context, int statusCode, UnifyResultSettingsOptions unifyResultSettings)
        {
            // 设置响应状态码
            UnifyContext.SetResponseStatusCodes(context, statusCode, unifyResultSettings);
            switch (statusCode)
            {
                // 处理 401 状态码
                case StatusCodes.Status401Unauthorized:
                    await context.Response.WriteAsJsonAsync(new RESTfulResult<object>
                    {
                        StatusCode = StatusCodes.Status401Unauthorized,
                        Succeeded = false,
                        Data = null,
                        Errors = "401 Unauthorized",
                        Extras = UnifyContext.Take(),
                        Timestamp = DateTimeOffset.UtcNow.ToUnixTimeMilliseconds()
                    });
                    break;
                // 处理 403 状态码
                case StatusCodes.Status403Forbidden:
                    await context.Response.WriteAsJsonAsync(new RESTfulResult<object>
                    {
                        StatusCode = StatusCodes.Status403Forbidden,
                        Succeeded = false,
                        Data = null,
                        Errors = "403 Forbidden",
                        Extras = UnifyContext.Take(),
                        Timestamp = DateTimeOffset.UtcNow.ToUnixTimeMilliseconds()
                    });
                    break;

                default:
                    break;
            }
        }

        /// <summary>
        /// 成功返回值
        /// </summary>
        /// <param name="context"></param>
        /// <param name="data"></param>
        /// <returns></returns>
        public IActionResult OnSucceeded(ActionExecutedContext context, object data)
        {
            // 处理内容结果
            if (context.Result is ContentResult contentResult) data = contentResult.Content;
            // 处理对象结果
            else if (context.Result is ObjectResult objectResult) data = objectResult.Value;
            else if (context.Result is EmptyResult) data = null;
            else return null;

            return new JsonResult(new RESTfulResult<object>
            {
                StatusCode = context.Result is EmptyResult ? StatusCodes.Status204NoContent : StatusCodes.Status200OK,  // 处理没有返回值情况 204
                Succeeded = true,
                Data = data,
                Errors = null,
                Extras = UnifyContext.Take(),
                Timestamp = DateTimeOffset.UtcNow.ToUnixTimeMilliseconds()
            });
        }
        /// <summary>
        /// 验证失败返回值
        /// </summary>
        /// <param name="context"></param>
        /// <param name="metadata"></param>
        /// <returns></returns>
        public IActionResult OnValidateFailed(ActionExecutingContext context, ValidationMetadata metadata)
        {
            var msg = "发生错误";
            var validationResults = metadata.ValidationResult;
            if (validationResults != null && validationResults.Count() > 0)
            {
                var messages = validationResults.FirstOrDefault().Value;
                if (messages.Length > 0)
                {
                    msg = messages[0];
                }
            }
            return new JsonResult(new RESTfulResult<object>
            {
                StatusCode = StatusCodes.Status400BadRequest,
                Succeeded = false,
                Data = null,
                Errors = msg,
                Extras = UnifyContext.Take(),
                Timestamp = DateTimeOffset.UtcNow.ToUnixTimeMilliseconds()
            });
        }
    }
}