package repositories

import (
	"context"
	"encoding/json"
	"errors"
	"fmt"
	"fusenapi/constants"
	"fusenapi/model/gmodel"
	"fusenapi/utils/basic"
	"fusenapi/utils/format"
	"fusenapi/utils/order"
	"fusenapi/utils/step_price"
	"math"
	"strings"
	"time"

	"github.com/aws/aws-sdk-go/aws/session"
	"gorm.io/gorm"
)

func NewOrder(gormDB *gorm.DB, bLMServiceUrl *string, awsSession *session.Session) Order {
	return &defaultOrder{
		MysqlConn: gormDB,
	}
}

type (
	defaultOrder struct {
		MysqlConn *gorm.DB
	}
	Order interface {
		// 下单
		Create(ctx context.Context, in *CreateReq) (res *CreateRes, err error)
		// 预支付
		// 列表
		// 详情
	}

	OrderAddress struct {
		Address string `json:"address"` // 详细地址
		Mobile  string `json:"mobile"`  // 手机
		Name    string `json:"name"`    // 姓名
	}

	/* 下单 */
	CreateReq struct {
		ExpectedDeliveryTime time.Time     `json:"expected_delivery_time"` // 预计到货时间
		ExchangeRate         int64         `json:"exchange_rate"`          // 换算汇率（厘）
		CurrentCurrency      string        `json:"current_currency"`       // 当前货币
		OriginalCurrency     string        `json:"original_currency"`      // 原始货币
		UserId               int64         `json:"user_id"`
		CartIds              []int64       `json:"cart_ids"`
		DeliveryMethod       int64         `json:"delivery_method"`
		DeliveryAddress      *OrderAddress `json:"delivery_address"` // 收货地址
	}
	CreateRes struct {
		ErrorCode basic.StatusResponse
		OrderSn   string
	}
	/* 下单 */
)

// 下单
func (d *defaultOrder) Create(ctx context.Context, in *CreateReq) (res *CreateRes, err error) {
	var errorCode basic.StatusResponse
	// 订单编号
	var orderSn string = order.GenerateOrderNumber(int(in.DeliveryMethod), int(in.UserId))

	err = d.MysqlConn.WithContext(ctx).Transaction(func(tx *gorm.DB) error {
		// 查询购物车
		var shoppingCartList []*gmodel.RelaFsShoppingCart
		resShoppingCartFind := tx.Preload("ShoppingCartProduct", func(dbPreload *gorm.DB) *gorm.DB {
			return dbPreload.Table(gmodel.NewFsProductModel(tx).TableName()).Preload("CoverResource")
		}).Preload("ShoppingCartProductPriceList").
			Preload("ShoppingCartProductModel3dList").
			Preload("ShoppingCartProductModel3dFitting").
			Where("id IN ?", in.CartIds).
			Where("user_id = ?", in.UserId).
			Find(&shoppingCartList)
		err = resShoppingCartFind.Error
		if err != nil {
			return err
		}
		shoppingCartListLen := len(shoppingCartList)
		if shoppingCartListLen == 0 {
			errorCode = *basic.CodeErrOrderCreatShoppingCartEmpty
			return errors.New(errorCode.Message)
		}
		if shoppingCartListLen != len(in.CartIds) {
			errorCode = *basic.CodeErrOrderCreatShoppingCartNotMatched
			return errors.New(errorCode.Message)
		}

		// 订单商品列表
		var orderProductList []gmodel.OrderProduct

		var shippingFee gmodel.AmountInfo
		// 订单税费总价（厘）
		var shippingFeeTotal int64

		var tax = gmodel.AmountInfo{}
		// 订单邮费总价（厘）
		var taxTotal int64

		var discount gmodel.AmountInfo
		// 订单折扣总价（厘）
		var discountTotal int64

		var subtotal gmodel.AmountInfo
		// 订单商品总价（厘）
		var orderProductTotal int64

		var total gmodel.AmountInfo
		// 订单总价（厘）
		var orderTotal int64

		var nowTime = time.Now().UTC()

		// 收货地址
		var orderAddress *gmodel.OrderAddress

		// 支付状态
		var payStatus = constants.ORDERPAYSTATUSUNPAIDDEPOSIT

		// 直邮
		if in.DeliveryMethod == constants.DELIVERYMETHODDIRECTMAIL {
			orderAddress = &gmodel.OrderAddress{
				Mobile: in.DeliveryAddress.Mobile,
				Name:   in.DeliveryAddress.Name,
			}
		}

		for _, shoppingCart := range shoppingCartList {
			// 购物车快照
			var shoppingCartSnapshot gmodel.CartSnapshot
			// 购物车商品价格
			var shoppingCartProductPrice *gmodel.FsProductPrice
			// 购物车商品模型
			var shoppingCartProductModel3d *gmodel.FsProductModel3d
			if shoppingCart.Snapshot != nil {
				json.Unmarshal([]byte(*shoppingCart.Snapshot), &shoppingCartSnapshot)
			}
			// 商品异常
			if shoppingCart.ShoppingCartProduct == nil || (shoppingCart.ShoppingCartProduct != nil && *shoppingCart.ShoppingCartProduct.IsShelf == 0) {
				errorCode = *basic.CodeErrOrderCreatProductAbsent
				errorCode.Message = "create order failed, product '" + shoppingCartSnapshot.ProductInfo.ProductName + "'is absent"
				return errors.New(errorCode.Message)
			}
			// 商品价格异常
			if len(shoppingCart.ShoppingCartProductPriceList) == 0 {
				errorCode = *basic.CodeErrOrderCreatProductPriceAbsent
				errorCode.Message = "create order failed, price of product '" + shoppingCartSnapshot.ProductInfo.ProductName + "'is absent"
				return errors.New(errorCode.Message)
			} else {
				var isProductPrice bool
				for _, shoppingCartProductPriceInfo := range shoppingCart.ShoppingCartProductPriceList {
					if shoppingCart.SizeId == shoppingCartProductPriceInfo.SizeId {
						shoppingCartProductPrice = shoppingCartProductPriceInfo
						isProductPrice = true
						break
					}
				}
				if !isProductPrice {
					errorCode = *basic.CodeErrOrderCreatProductPriceAbsent
					errorCode.Message = "create order failed, price of product '" + shoppingCartSnapshot.ProductInfo.ProductName + "'is absent"
					return errors.New(errorCode.Message)
				}
				shoppingCart.ShoppingCartProductPriceList = []*gmodel.FsProductPrice{shoppingCartProductPrice}
			}

			// 商品模型异常
			if len(shoppingCart.ShoppingCartProductModel3dList) == 0 {
				errorCode = *basic.CodeErrOrderCreatProductAccessoryAbsent
				errorCode.Message = "create order failed, accessoryof product '" + shoppingCartSnapshot.ProductInfo.ProductName + "'is absent"
				return errors.New(errorCode.Message)
			} else {
				var isProductModel bool
				for _, shoppingCartProductModel3dInfo := range shoppingCart.ShoppingCartProductModel3dList {
					if shoppingCart.SizeId == shoppingCartProductModel3dInfo.SizeId {
						shoppingCartProductModel3d = shoppingCartProductModel3dInfo
						isProductModel = true
						break
					}
				}
				if !isProductModel {
					errorCode = *basic.CodeErrOrderCreatProductAccessoryAbsent
					errorCode.Message = "create order failed, accessory of product '" + shoppingCartSnapshot.ProductInfo.ProductName + "'is absent"
					return errors.New(errorCode.Message)
				}
				shoppingCart.ShoppingCartProductModel3dList = []*gmodel.FsProductModel3d{shoppingCartProductModel3d}
			}

			var stepNum []int
			var stepPrice []int
			if *shoppingCartProductPrice.StepNum == "" {
				errorCode = *basic.CodeErrOrderCreatProductPriceAbsent
				errorCode.Message = "create order failed, step num of product '" + shoppingCartSnapshot.ProductInfo.ProductName + "'is failed"
				return errors.New(errorCode.Message)
			} else {
				json.Unmarshal([]byte(*shoppingCartProductPrice.StepNum), &stepNum)
			}
			if *shoppingCartProductPrice.StepPrice == "" {
				errorCode = *basic.CodeErrOrderCreatProductPriceAbsent
				errorCode.Message = "create order failed, step price of product '" + shoppingCartSnapshot.ProductInfo.ProductName + "'is failed"
				return errors.New(errorCode.Message)
			} else {
				json.Unmarshal([]byte(*shoppingCartProductPrice.StepPrice), &stepPrice)
			}

			/* 计算价格 */

			//阶梯数量切片
			stepNum, err := format.StrSlicToIntSlice(strings.Split(*shoppingCartProductPrice.StepNum, ","))
			if err != nil {
				errorCode = *basic.CodeErrOrderCreatProductPriceAbsent
				errorCode.Message = fmt.Sprintf("failed to parse step number:%d_%d", *shoppingCart.ProductId, *shoppingCart.SizeId)
				return errors.New(errorCode.Message)
			}
			lenStepNum := len(stepNum)
			//阶梯价格切片
			stepPrice, err = format.StrSlicToIntSlice(strings.Split(*shoppingCartProductPrice.StepPrice, ","))
			if err != nil {
				errorCode = *basic.CodeErrOrderCreatProductPriceAbsent
				errorCode.Message = fmt.Sprintf("failed to parse step price:%d_%d", *shoppingCart.ProductId, *shoppingCart.SizeId)
				return errors.New(errorCode.Message)
			}
			lenStepPrice := len(stepPrice)
			if lenStepPrice == 0 || lenStepNum == 0 {
				errorCode = *basic.CodeErrOrderCreatProductPriceAbsent
				errorCode.Message = fmt.Sprintf("step price or step number is not set:%d_%d", *shoppingCart.ProductId, *shoppingCart.SizeId)
				return errors.New(errorCode.Message)
			}
			// 购买数量
			reqPurchaseQuantity := *shoppingCart.PurchaseQuantity
			// 购买箱数
			boxQuantity := int(math.Ceil(float64(reqPurchaseQuantity) / float64(*shoppingCartProductPrice.EachBoxNum)))
			// 根据数量获取阶梯价格中对应的价格
			productPrice := step_price.GetCentStepPrice(boxQuantity, stepNum, stepPrice)
			// 如果有配件，单价也要加入配件价格
			if *shoppingCart.FittingId > 0 {
				if shoppingCart.ShoppingCartProductModel3dFitting != nil {
					productPrice = productPrice + *shoppingCart.ShoppingCartProductModel3dFitting.Price
				}
			}
			// 单个购物车总价（厘）
			productTotalPrice := productPrice * reqPurchaseQuantity

			/* 计算价格 */

			// 订单商品总价（厘）
			orderProductTotal = orderProductTotal + productTotalPrice

			// 订单商品
			var productSnapshot = make(map[string]interface{}, 1)
			productSnapshot["product_snapshot"] = shoppingCart.ShoppingCartProduct
			var productCoverMetadata map[string]interface{}
			if shoppingCart.ShoppingCartProduct.CoverResource != nil && shoppingCart.ShoppingCartProduct.CoverResource.Metadata != nil {
				json.Unmarshal(*shoppingCart.ShoppingCartProduct.CoverResource.Metadata, &productCoverMetadata)
			}
			orderProductList = append(orderProductList, gmodel.OrderProduct{
				TotalPrice: order.GetAmountInfo(order.GetAmountInfoReq{
					ExchangeRate:     in.ExchangeRate,
					Initiate:         productTotalPrice,
					Current:          productTotalPrice,
					CurrentCurrency:  in.CurrentCurrency,
					OriginalCurrency: in.OriginalCurrency,
				}),
				ExpectedDeliveryTime: in.ExpectedDeliveryTime,
				PurchaseQuantity:     *shoppingCart.PurchaseQuantity,
				ProductID:            *shoppingCart.ProductId,
				ProductCover:         *shoppingCart.ShoppingCartProduct.Cover,
				ProductCoverMetadata: productCoverMetadata,
				ProductName:          *shoppingCart.ShoppingCartProduct.Title,
				ItemPrice: order.GetAmountInfo(order.GetAmountInfoReq{
					ExchangeRate:     in.ExchangeRate,
					Initiate:         productPrice,
					Current:          productPrice,
					CurrentCurrency:  in.CurrentCurrency,
					OriginalCurrency: in.OriginalCurrency,
				}),
				ProductSnapshot:      productSnapshot,
				ShoppingCartSnapshot: &shoppingCart.FsShoppingCart,
				ProductSn:            *shoppingCart.ShoppingCartProduct.Sn,
				DiyInformation:       &shoppingCartSnapshot.UserDiyInformation,
				FittingInfo:          &shoppingCartSnapshot.FittingInfo,
				SizeInfo:             &shoppingCartSnapshot.SizeInfo,
				StepNum:              stepNum,
			})
		}

		subtotal = order.GetAmountInfo(order.GetAmountInfoReq{
			ExchangeRate:     in.ExchangeRate,
			Initiate:         orderProductTotal,
			Current:          orderProductTotal,
			CurrentCurrency:  in.CurrentCurrency,
			OriginalCurrency: in.OriginalCurrency,
		})

		orderTotal = orderProductTotal + shippingFeeTotal + taxTotal - discountTotal
		total = order.GetAmountInfo(order.GetAmountInfoReq{
			ExchangeRate:     in.ExchangeRate,
			Initiate:         orderTotal,
			Current:          orderTotal,
			CurrentCurrency:  in.CurrentCurrency,
			OriginalCurrency: in.OriginalCurrency,
		})
		// 定金
		var depositInt int64 = orderTotal / 2
		var deposit = gmodel.PayInfo{
			Status: gmodel.PayStatus{
				StatusCode:  int64(constants.PAYSTATUSUNPAID),
				StatusTitle: constants.PayStatusMessage[constants.PAYSTATUSUNPAID],
			},
			PayAmount: order.GetAmountInfo(order.GetAmountInfoReq{
				ExchangeRate:     in.ExchangeRate,
				Initiate:         depositInt,
				Current:          depositInt,
				CurrentCurrency:  in.CurrentCurrency,
				OriginalCurrency: in.OriginalCurrency,
			}),
		}

		// 尾款
		var remainingBalanceInt int64 = orderTotal - depositInt
		var remainingBalance = gmodel.PayInfo{
			Status: gmodel.PayStatus{
				StatusCode:  int64(constants.PAYSTATUSUNPAID),
				StatusTitle: constants.PayStatusMessage[constants.PAYSTATUSUNPAID],
			},
			PayAmount: order.GetAmountInfo(order.GetAmountInfoReq{
				ExchangeRate:     in.ExchangeRate,
				Initiate:         remainingBalanceInt,
				Current:          remainingBalanceInt,
				CurrentCurrency:  in.CurrentCurrency,
				OriginalCurrency: in.OriginalCurrency,
			}),
		}
		var orderAmount = gmodel.OrderAmount{
			Deposit:          deposit,
			RemainingBalance: remainingBalance,
			Discount:         discount,
			ShippingFee:      shippingFee,
			Tax:              tax,
			Subtotal:         subtotal,
			Total:            total,
		}

		// 订单状态--当前
		var status = gmodel.OrderStatus{
			Ctime:       nowTime,
			Utime:       nowTime,
			StatusCode:  constants.ORDERSTATUSUNPAIDDEPOSIT,
			StatusTitle: constants.OrderStatusMessage[constants.ORDERSTATUSUNPAIDDEPOSIT],
		}
		// 订单状态--链路
		var statusLink = order.GenerateOrderStatusLink(in.DeliveryMethod, nowTime, in.ExpectedDeliveryTime)
		var orderInfo = gmodel.OrderInfo{
			Ctime:          nowTime,
			DeliveryMethod: in.DeliveryMethod,
			OrderSn:        orderSn,
			Status:         status,
			StatusLink:     statusLink,
		}

		var orderDetail = gmodel.OrderDetail{
			DeliveryAddress: orderAddress,
			OrderAmount:     orderAmount,
			OrderInfo:       orderInfo,
			OrderProduct:    orderProductList,
			PayStatus:       payStatus,
		}
		// 数据库操作
		var order = gmodel.NewFsOrder{
			UserId:         &in.UserId,
			DeliveryMethod: &in.DeliveryMethod,
			OrderSn:        &orderSn,
			Status:         (*int64)(&status.StatusCode),
			PayStatus:      (*int64)(&payStatus),
			Ctime:          &nowTime,
			Metadata:       &orderDetail,
		}
		result := tx.Create(&order)
		if result.Error != nil {
			return result.Error
		}
		return nil
	})
	if err != nil {
		return &CreateRes{
			OrderSn:   orderSn,
			ErrorCode: errorCode,
		}, err
	}
	return &CreateRes{
		OrderSn:   orderSn,
		ErrorCode: errorCode,
	}, nil
}