package service

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

type SalesReturnService struct{}

func (slf SalesReturnService) AddSalesReturn(salesReturn *model.SalesReturn) int {
	salesReturn.AmountShouldRefund = decimal.Zero
	salesReturn.AmountHasRefund = decimal.Zero
	salesReturn.AmountTotal = decimal.Zero
	for _, product := range salesReturn.Products {
		salesReturn.AmountTotal = salesReturn.AmountTotal.Add(product.Amount.Mul(product.Price))
		product.Id = 0
	}
	salesReturn.AmountShouldRefund = salesReturn.AmountTotal
	err := model.NewSalesReturnSearch().Create(salesReturn)
	if err != nil {
		return ecode.SalesReturnExist
	}

	return ecode.OK
}

func (slf SalesReturnService) DeleteSalesReturn(id int) int {
	_, err := model.NewSalesReturnSearch().SetId(id).First()
	if err != nil {
		return ecode.SalesReturnNotExist
	}
	err = model.WithTransaction(func(db *gorm.DB) error {
		err = model.NewSalesReturnSearch().SetOrm(db).SetId(id).Delete()
		if err != nil {
			return err
		}
		err = model.NewSalesRefundSearch().SetOrm(db).SetSourceType(constvar.RefundSourceTypeSalesReturn).SetSourceId(id).Delete()
		if err != nil {
			return err
		}
		return nil
	})
	if err != nil {
		return ecode.SalesReturnNotExist
	}
	return ecode.OK
}

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

func (SalesReturnService) UpdateSalesReturn(salesReturn *model.SalesReturn) int {
	// check salesReturn exist
	_, err := model.NewSalesReturnSearch().SetId(salesReturn.Id).First()
	if err != nil {
		return ecode.SalesReturnNotExist
	}

	salesReturn.AmountShouldRefund = decimal.Zero
	salesReturn.AmountHasRefund = decimal.Zero
	salesReturn.AmountTotal = decimal.Zero
	for _, product := range salesReturn.Products {
		salesReturn.AmountTotal = salesReturn.AmountTotal.Add(product.Amount.Mul(product.Price))
	}
	salesReturn.AmountShouldRefund = salesReturn.AmountTotal

	old, err := model.NewSalesReturnSearch().SetId(salesReturn.Id).SetPreload(true).First()
	if err != nil {
		return ecode.DBErr
	}
	newProducts, removedProducts := NewProductsService().PickDiffProducts(salesReturn.Products, old.Products)
	err = model.WithTransaction(func(db *gorm.DB) error {
		err := model.NewSalesReturnSearch().SetId(salesReturn.Id).Update(salesReturn)
		if err != nil {
			return err
		}
		if len(removedProducts) > 0 {
			removedProductIds := make([]uint, 0, len(removedProducts))
			for _, product := range removedProducts {
				removedProductIds = append(removedProductIds, product.Id)
			}
			err = model.NewProductSearch(db).SetIds(removedProductIds).Delete()
			if err != nil {
				return err
			}
		}
		if len(newProducts) > 0 {
			for _, p := range newProducts {
				p.Id = 0
			}
			err = model.NewProductSearch(db).CreateBatch(newProducts)
			if err != nil {
				return err
			}
			var rel []*model.SalesReturnProduct
			for _, p := range newProducts {
				rel = append(rel, &model.SalesReturnProduct{
					SalesReturnId: salesReturn.Id,
					ProductId:     p.Id,
				})
			}
			err = model.NewSalesReturnProductSearch().CreateBatch(rel)
			if err != nil {
				return err
			}
		}
		return nil
	})

	if err != nil {
		return ecode.DBErr
	}

	return ecode.OK
}

func (SalesReturnService) GetSalesReturnList(params request.GetSalesReturnList, memberIds []int) ([]*model.SalesReturn, int64, int) {
	// get contact list
	contacts, total, err := model.NewSalesReturnSearch().
		SetKeywordType(params.KeywordType).
		SetKeyword(params.Keyword).
		SetPage(params.Page, params.PageSize).
		SetSourceId(params.SourceId).
		SetSourceType(params.SourceType).
		SetClientId(params.ClientId).
		SetPreload(true).
		SetMemberIds(memberIds).
		FindAll()
	if err != nil {
		return nil, 0, ecode.SalesReturnListErr
	}
	return contacts, total, ecode.OK
}

func (SalesReturnService) GetSalesReturnListByIds(ids []int) ([]*model.SalesReturn, int) {
	// get contact list
	salesReturns, err := model.NewSalesReturnSearch().
		SetIds(ids).
		Find()
	if err != nil {
		return nil, ecode.SalesReturnListErr
	}
	return salesReturns, ecode.OK
}