package repositories

import (
	"context"
	"encoding/json"
	"errors"
	"fusenapi/model/gmodel"
	"fusenapi/utils/basic"
	"fusenapi/utils/shopping_cart"
	"fusenapi/utils/step_price"
	"math"

	"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
		// 预支付
		// 列表
		// 详情
	}

	/* 下单 */
	CreateReq struct {
		CurrentCurrency  string  `json:"current_currency"`  // 当前货币
		ExchangeRate     string  `json:"exchange_rate"`     // 换算汇率
		OriginalCurrency string  `json:"original_currency"` // 原始货币
		UserId           int64   `json:"user_id"`
		CartIds          []int64 `json:"cart_ids"`
		DeliveryMethod   string  `json:"delivery_method"`
	}
	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
	err = d.MysqlConn.WithContext(ctx).Transaction(func(tx *gorm.DB) error {
		// 查询购物车
		var shoppingCartList []*gmodel.RelaFsShoppingCart
		resShoppingCartFind := tx.Preload("ShoppingCartProduct").Preload("ShoppingCartProductPriceList").Preload("ShoppingCartProductModel3dList").
			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)
		}

		var orderProductList []*gmodel.OrderProduct

		for _, shoppingCart := range shoppingCartList {
			// 购物车快照
			var shoppingCartSnapshot shopping_cart.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 purchaseQuantity float64 = float64(*shoppingCart.PurchaseQuantity)
			var eachBoxNum float64 = float64(*shoppingCartProductPrice.EachBoxNum)
			var boxNum float64 = math.Ceil(purchaseQuantity / eachBoxNum)
			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)
			}
			// 商品单价
			productPrice := step_price.GetCentStepPrice(int(boxNum), stepNum, stepPrice)

			// 商品总价
			productTotalPrice := productPrice * *shoppingCart.PurchaseQuantity

			// 存储订单商品
			orderProductList = append(orderProductList, &gmodel.OrderProduct{})
		}

		return nil
	})
	if err != nil {

	}
	return &CreateRes{
		ErrorCode: errorCode,
	}, nil
}