using Ant.Core.Utils;
using Ant.Core.WebApi.Enum;
using Ant.Core.WebApi.Model;
using Central.Control.WebApi.DbEntity;
using Central.Control.WebApi.EFDbContext;
using Central.Control.WebApi.Enum;
using Central.Control.WebApi.Models.Request;
using Central.Control.WebApi.Models.Response;
using Central.Control.WebApi.Service.Interface;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;

namespace Central.Control.WebApi.Service
{
    /// <summary>
    /// 
    /// </summary>
    public class OrderService: IOrderService
    {
        private readonly IDbContext _dbContent;
        private readonly IUserService _userService;

        /// <summary>
        /// 
        /// </summary>
        /// <param name="dbContent"></param>
        public OrderService(
            IDbContext dbContent,
            IUserService userService)
        {
            _dbContent = dbContent;
            _userService = userService;
        }

        /// <summary>
        /// 下单
        /// </summary>
        /// <param name="req"></param>
        /// <returns></returns>
        public ApiResult<OrderResponseDto> Order(OrderRequestDto req)
        {
            #region 1、验证参数
            if (req == null
                || req.OrderInfo == null
                || req.OrderInfo.Count() == 0)
            {
                return new ApiResult<OrderResponseDto>(ApiStatusCode.InvalidParameter, "请求参数不正确");
            }
            #endregion

            #region 2、验证相应数据和库存
            var productIds = req.OrderInfo.Select(p => p.ProductId).ToList();
            var products = _dbContent.Set<YW_Product>().Where(p => p.IsDelete == 0 && p.Sale == Enum.SaleEnum.On && productIds.Contains(p.Id)).ToList();
            if (products.Count() <= 0)
            {
                return new ApiResult<OrderResponseDto>(ApiStatusCode.RecordNotFound, "未找到下单的商品");
            }
            #endregion

            #region 3、库存验证
            var session = _userService.GetLoginSession();
            var orderId = IdGenerator.NewId();
            List<YW_OrderDetails> orderDetailAdds = new List<YW_OrderDetails>();
            List<YW_OrderProcess> orderProcessAdds = new List<YW_OrderProcess>();

            foreach (var o in req.OrderInfo)
            {
                var currentProduct = products.FirstOrDefault(p => p.Id == o.ProductId);
                if (currentProduct == null)
                {
                    return new ApiResult<OrderResponseDto>(ApiStatusCode.RecordNotFound, $"{o.ProductId}商品不存在");
                }
                if (currentProduct.Stock < o.Count)
                {
                    return new ApiResult<OrderResponseDto>(ApiStatusCode.Forbidden, $"{currentProduct.Name}商品库存不足，请修改后重新下单");
                }
                // 扣库存
                currentProduct.Stock = currentProduct.Stock - o.Count;

                // orderDetails
                orderDetailAdds.Add(new YW_OrderDetails()
                {
                    Id = IdGenerator.NewId(),
                    OrderId = orderId,
                    ProductId = currentProduct.Id,
                    Name = currentProduct.Name,
                    Code = currentProduct.Code,
                    Img = currentProduct.Img,
                    Info = currentProduct.Info,
                    Price = currentProduct.Price,
                    BuyingPrice = currentProduct.BuyingPrice,
                    Count = o.Count,
                    CreateBY = session.UserId
                });
            }
            #endregion

            #region 4、下单
            YW_Order order = new YW_Order()
            {
                Id = orderId,
                DeviceId = session.UserId,
                Price = orderDetailAdds.Sum(p => p.Price * p.Count),
                PayStatus = PayStatusEnum.UnPay,
                OrderStatus = OrderStatusEnum.UnPay,
                PaySerialId = Snowflake.Instance().GetId().ToString(),
                CreateBY = session.UserId
            };
            YW_OrderProcess orderProcess = new YW_OrderProcess()
            {
                Id = IdGenerator.NewId(),
                OrderId = order.Id,
                DeviceId = session.UserId,
                CurrentOrderStatus = OrderStatusEnum.UnPay,
                Message = "下单成功",
                CreateBY = session.Id
            };
            #endregion

            #region 5、存库
            _dbContent.Set<YW_Order>().Add(order);
            _dbContent.Set<YW_OrderProcess>().Add(orderProcess);
            _dbContent.Set<YW_OrderDetails>().AddRange(orderDetailAdds);

            // 数据库执行 库存已经改过了，会自动保存
            _dbContent.SaveChanges();
            #endregion

            return new ApiResult<OrderResponseDto>(new OrderResponseDto()
            {
                OrderId = order.Id,
                Price = order.Price
            });
        }

        /// <summary>
        /// 获取待烧烤的商品列表
        /// <returns></returns>
        public ApiResult<List<QueueOrderResponseDto>> GetQueueOrders()
        {
            var orders = _dbContent.Set<YW_Order>()
                                    .Where(p => p.IsDelete == 0
                                                && p.PayStatus == PayStatusEnum.Paid
                                                && p.OrderStatus == OrderStatusEnum.Paid)
                                    .OrderBy(p => p.CreateDT).ToList();
            var orderIds = orders.Select(p => p.Id).ToList();

            var orderDetails = _dbContent.Set<YW_OrderDetails>().Where(p => p.IsDelete == 0 && orderIds.Contains(p.OrderId)).ToList();



            List<QueueOrderResponseDto> result = new List<QueueOrderResponseDto>();
            orders.ForEach(item => {
                QueueOrderResponseDto resultItem = new QueueOrderResponseDto()
                {
                    OrderId = item.Id,
                    Price = item.Price,
                    OrderDetails = orderDetails
                                     .Where(p => p.OrderId == item.Id)
                                     .Select(p => SafeClone<YW_OrderDetails, QueueOrderDetailsDto>.Trans(p))
                                     .ToList()
                };
                resultItem.OrderDetails?.ForEach(p => p.Img = $"{ProductService.ImagePrefix}{p.Img}");

                result.Add(resultItem);
            });
            return new ApiResult<List<QueueOrderResponseDto>>(result);
        }

        /// <summary>
        /// 回写流程状态
        /// </summary>
        /// <param name="req"></param>
        /// <returns></returns>
        public ApiResult OrderProcess(OrderProcessRequestDto req)
        {
            if (req == null)
            {
                return new ApiResult(ApiStatusCode.InvalidParameter, "请求参数不正确");
            }
            var order = _dbContent.Set<YW_Order>().FirstOrDefault(p => p.Id == req.OrderId);
            if (order == null)
            {
                return new ApiResult(ApiStatusCode.InvalidParameter, "未找到相应订单");
            }
            if (order.PayStatus != PayStatusEnum.Paid)
            {
                return new ApiResult(ApiStatusCode.InvalidParameter, "未支付订单不能回写流程");
            }
            if (order.OrderStatus == OrderStatusEnum.UnPay
                || order.OrderStatus == OrderStatusEnum.Cancel)
            {
                return new ApiResult(ApiStatusCode.InvalidParameter, "未支付或已取消订单不能回写流程");
            }
            var seesion = _userService.GetLoginSession();
            // 修改订单状态
            order.OrderStatus = req.OrderStatus;
            // 记录订单流程
            YW_OrderProcess orderProcess = new YW_OrderProcess()
            {
                Id = IdGenerator.NewId(),
                OrderId = req.OrderId,
                DeviceId = seesion.UserId,
                CurrentOrderStatus = req.OrderStatus,
                Message = req.Message,
                CreateBY = seesion.UserId
            };
            _dbContent.Set<YW_OrderProcess>().Add(orderProcess);
            _dbContent.SaveChanges();

            return new ApiResult();
        }

        /// <summary>
        /// 支付回写（雏形，需要根据实际需要接入支付宝或微信）
        /// </summary>
        /// <param name="req"></param>
        /// <returns></returns>
        public ApiResult PayWriteBack(PayWriteBackRequestDto req)
        {
            if (req == null
                || string.IsNullOrWhiteSpace(req.PaySerialId))
            {
                return new ApiResult(ApiStatusCode.InvalidParameter, "请求参数不正确");
            }
            var order = _dbContent.Set<YW_Order>().FirstOrDefault(p => p.PaySerialId == req.PaySerialId);
            if (order == null)
            {
                return new ApiResult(ApiStatusCode.InvalidParameter, "未找到相应订单");
            }
            var status = GetStatusByPayWriteBack(req.PayStatus);
            // 修改订单状态
            order.PayStatus = status.Item1;
            order.OrderStatus = status.Item2;
            // 记录订单流程
            YW_PayCall payCall = new YW_PayCall()
            {
                Id = IdGenerator.NewId(),
                OrderId = order.Id,
                PayStatus = status.Item1,
                PaySerialId = req.PaySerialId,
                PayAccount = req.PayAccount,
                CreateBY = req.PayAccount
            };
            _dbContent.Set<YW_PayCall>().Add(payCall);
            _dbContent.SaveChanges();

            return new ApiResult();
        }

        /// <summary>
        /// 
        /// </summary>
        /// <param name="payStatusBack"></param>
        /// <returns></returns>
        private Tuple<PayStatusEnum, OrderStatusEnum> GetStatusByPayWriteBack(int payStatusBack)
        {
            // 临时：payStatus 0失败，1成功
            PayStatusEnum payStatus = PayStatusEnum.Fail;
            OrderStatusEnum orderStatus = OrderStatusEnum.UnPay;
            switch (payStatusBack)
            {
                case 1:// 成功
                    payStatus = PayStatusEnum.Paid;
                    orderStatus = OrderStatusEnum.Paid;
                    break;
                default:// 失败
                    break;
            }

            return new Tuple<PayStatusEnum, OrderStatusEnum>(payStatus, orderStatus);
        }

        // public Tuple<bool,string> ProcessOrderStock(int )
    }
}