package service

import (
	"aps_crm/constvar"
	"aps_crm/model"
	"aps_crm/pkg/ecode"
	"errors"
	"github.com/shopspring/decimal"
	"gorm.io/gorm"
)

type SalesRefundService struct{}

func (SalesRefundService) AddSalesRefund(salesRefund *model.SalesRefund) int {
	salesReturnRecord, err := model.NewSalesReturnSearch().SetId(salesRefund.SalesReturnId).SetPreload(true).First()
	if err != nil {
		return ecode.SalesReturnNotExist
	}

	if code := CheckProduct(salesReturnRecord.Products, salesRefund.Products); code != ecode.OK {
		return code
	}
	var amount decimal.Decimal
	for _, product := range salesRefund.Products {
		amount = amount.Add(product.Amount.Mul(product.Price))
	}
	code := ecode.OK
	err = model.WithTransaction(func(db *gorm.DB) error {
		err = model.NewSalesRefundSearch().Create(salesRefund)
		if err != nil {
			code = ecode.DBErr
			return err
		}
		salesReturnRecord.AmountHasRefund = salesReturnRecord.AmountHasRefund.Add(amount).Round(2)
		if salesReturnRecord.AmountHasRefund.GreaterThan(salesReturnRecord.AmountTotal) {
			code = ecode.SalesRefundProductBeyondTotalAmount
			return errors.New("退货产品对应总价超出应退总价")
		}
		salesReturnRecord.AmountShouldRefund = salesReturnRecord.AmountTotal.Sub(salesReturnRecord.AmountHasRefund).Round(2)
		err = model.NewSalesReturnSearch().SetId(salesRefund.SalesReturnId).Update(salesReturnRecord)
		if err != nil {
			code = ecode.DBErr
			return err
		}
		return nil
	})

	if err != nil {
		return code
	}

	return ecode.OK
}

func CheckProduct(returnProducts, refundProducts []*model.Product) int {
	returnProductsMap := make(map[uint]*model.Product, len(returnProducts))
	for _, product := range returnProducts {
		returnProductsMap[product.Id] = product
	}
	for _, product := range refundProducts {
		if returnProductsMap[product.Id] == nil {
			return ecode.SalesRefundProductNotExist
		}
		if !returnProductsMap[product.Id].Price.Equal(product.Price) || product.Amount.GreaterThan(returnProductsMap[product.Id].Amount) {
			return ecode.SalesRefundProductPriceOrAmountErr
		}
	}
	return ecode.OK
}

func (slf SalesRefundService) DeleteSalesRefund(id int) int {
	refund, err := model.NewSalesRefundSearch().SetId(id).First()
	if err != nil {
		return ecode.SalesRefundNotExist
	}
	salesReturnRecord, err := model.NewSalesReturnSearch().SetId(refund.SalesReturnId).SetPreload(true).First()
	if err != nil {
		return ecode.SalesReturnNotExist
	}

	var amount decimal.Decimal
	for _, product := range refund.Products {
		amount = amount.Add(product.Amount.Mul(product.Price))
	}

	err = model.WithTransaction(func(db *gorm.DB) error {
		err = model.NewSalesRefundSearch().SetId(id).Delete()
		if err != nil {
			return err
		}
		salesReturnRecord.AmountHasRefund = salesReturnRecord.AmountHasRefund.Sub(amount).Round(2)
		salesReturnRecord.AmountShouldRefund = salesReturnRecord.AmountTotal.Sub(salesReturnRecord.AmountHasRefund).Round(2)
		err = model.NewSalesReturnSearch().SetId(refund.SalesReturnId).Update(salesReturnRecord)
		if err != nil {
			return err
		}
		return nil
	})

	if err != nil {
		return ecode.SalesRefundNotExist
	}
	return ecode.OK
}

func (slf SalesRefundService) BatchDeleteSalesRefund(ids []int) (failIds []int, code int) {
	for _, id := range ids {
		code = slf.DeleteSalesRefund(id)
		if code != ecode.OK {
			failIds = append(failIds, id)
		}
	}
	return failIds, code
}

func (SalesRefundService) UpdateSalesRefund(salesRefund *model.SalesRefund) int {
	// check salesRefund exist
	oldRefund, err := model.NewSalesRefundSearch().SetId(salesRefund.Id).First()
	if err != nil {
		return ecode.SalesRefundNotExist
	}

	salesReturnRecord, err := model.NewSalesReturnSearch().SetId(salesRefund.SalesReturnId).SetPreload(true).First()
	if err != nil {
		return ecode.SalesReturnNotExist
	}

	if code := CheckProduct(salesReturnRecord.Products, salesRefund.Products); code != ecode.OK {
		return code
	}

	var diffAmount decimal.Decimal

	for _, product := range salesRefund.Products {
		diffAmount = diffAmount.Add(product.Amount.Mul(product.Price))
	}
	for _, product := range oldRefund.Products {
		diffAmount = diffAmount.Sub(product.Amount.Mul(product.Price))
	}

	code := ecode.OK
	err = model.WithTransaction(func(db *gorm.DB) error {
		err = model.NewSalesRefundSearch().SetId(salesRefund.Id).Update(salesRefund)
		if err != nil {
			code = ecode.DBErr
			return err
		}
		salesReturnRecord.AmountHasRefund = salesReturnRecord.AmountHasRefund.Sub(diffAmount).Round(2)
		salesReturnRecord.AmountShouldRefund = salesReturnRecord.AmountTotal.Sub(salesReturnRecord.AmountHasRefund).Round(2)

		if salesReturnRecord.AmountHasRefund.GreaterThan(salesReturnRecord.AmountTotal) {
			code = ecode.SalesRefundProductBeyondTotalAmount
			return errors.New("退货产品对应总价超出应退总价")
		}

		err = model.NewSalesReturnSearch().SetId(salesRefund.SalesReturnId).Update(salesReturnRecord)
		if err != nil {
			code = ecode.DBErr
			return err
		}
		return nil
	})

	if err != nil {
		return code
	}

	return ecode.OK
}

func (SalesRefundService) GetSalesRefundList(page, pageSize int, keywordType constvar.SalesRefundKeywordType, keyword string, sourceId int, memberIds []int) ([]*model.SalesRefund, int64, int) {
	// get contact list
	contacts, total, err := model.NewSalesRefundSearch().
		SetKeywordType(keywordType).
		SetKeyword(keyword).
		SetSourceId(sourceId).
		SetPreload(true).
		SetMemberIds(memberIds).
		SetPage(page, pageSize).FindAll()
	if err != nil {
		return nil, 0, ecode.SalesRefundListErr
	}
	return contacts, total, ecode.OK
}

func (SalesRefundService) GetSalesRefundListByIds(ids []int) ([]*model.SalesRefund, int) {
	// get contact list
	salesRefunds, err := model.NewSalesRefundSearch().
		SetIds(ids).
		Find()
	if err != nil {
		return nil, ecode.SalesReturnListErr
	}
	return salesRefunds, ecode.OK
}