package purchase

import (
	"github.com/spf13/cast"
	"gorm.io/gorm"
	"srm/global"
	"srm/model/common/request"
	"srm/model/purchase"
	purchaserequest "srm/model/purchase/request"
)

type PurchaseService struct{}

func NewPurchaseService() *PurchaseService {
	return &PurchaseService{}
}

//@function: CreatePurchase
//@description: 创建采购单
//@param: e model.Purchase
//@return: err error

func (exa *PurchaseService) CreatePurchase(params purchaserequest.AddPurchase) (err error) {
	err = global.GVA_DB.Transaction(func(tx *gorm.DB) error {
		err = global.GVA_DB.Create(&params.Purchase).Error
		if err != nil {
			return err
		}
		for _, product := range params.ProductList {
			product.PurchaseId = cast.ToInt(params.Purchase.ID)
		}
		return global.GVA_DB.Create(params.ProductList).Error
	})

	return err
}

//@function: DeleteFileChunk
//@description: 删除采购单
//@param: e model.Purchase
//@return: err error

func (exa *PurchaseService) DeletePurchase(id uint) (err error) {
	err = global.GVA_DB.Transaction(func(tx *gorm.DB) error {
		err = global.GVA_DB.Where("id = ?", id).Delete(&purchase.Purchase{}).Error
		if err != nil {
			return err
		}
		return global.GVA_DB.Where("purchase_id = ?", id).Delete(&purchase.PurchaseProducts{}).Error
	})
	return err
}

//@function: UpdatePurchase
//@description: 更新采购单
//@param: e *model.Purchase
//@return: err error

func (exa *PurchaseService) UpdatePurchase(params *purchaserequest.AddPurchase) (err error) {
	err = global.GVA_DB.Transaction(func(tx *gorm.DB) error {
		err = global.GVA_DB.Updates(params.Purchase).Error
		if err != nil {
			return err
		}
		err = global.GVA_DB.Where("purchase_id = ?", params.Purchase.ID).Delete(&purchase.PurchaseProducts{}).Error
		if err != nil {
			return err
		}
		for _, product := range params.ProductList {
			product.ID = 0
			product.PurchaseId = cast.ToInt(params.Purchase.ID)
		}
		return global.GVA_DB.Create(params.ProductList).Error
	})
	return err
}

//@function: GetPurchase
//@description: 获取采购单信息
//@param: id uint
//@return: purchase model.Purchase, err error

func (exa *PurchaseService) GetPurchase(id uint) (purchase purchase.Purchase, err error) {
	err = global.GVA_DB.Where("id = ?", id).First(&purchase).Error
	return
}

//@function: GetPurchaseList
//@description: 分页获取采购单列表
//@param: info request.PageInfo
//@return: list interface{}, total int64, err error

func (exa *PurchaseService) GetPurchaseList(info request.PageInfo) (list interface{}, total int64, err error) {
	limit := info.PageSize
	offset := info.PageSize * (info.Page - 1)
	db := global.GVA_DB.Model(&purchase.Purchase{})
	if info.Keyword != "" {
		db.Distinct("purchases.id").Joins("left join purchase_products on purchase_products.purchase_id = purchases.id").
			Joins("left join Product on Product.Id = purchase_products.product_id").
			Joins("left join supplier on supplier.Id = purchases.supplier_id").
			Where("purchases.name like ?", "%"+info.Keyword+"%").
			Or("Product.name like ?", "%"+info.Keyword+"%").
			Or("supplier.name like ?", "%"+info.Keyword+"%")
	}
	var purchaseList []purchase.Purchase
	err = db.Count(&total).Error
	if err != nil {
		return purchaseList, total, err
	}
	err = db.Limit(limit).Offset(offset).Find(&purchaseList).Error
	return purchaseList, total, err
}

//@function: GetPurchaseProductList
//@description: 分页获取采购单产品列表
//@param: sysUserAuthorityID string
//@return: list interface{},  err error

func (exa *PurchaseService) GetPurchaseProductList(purchaseId uint) (list []*purchase.PurchaseProducts, err error) {
	db := global.GVA_DB.Model(&purchase.PurchaseProducts{})
	list = make([]*purchase.PurchaseProducts, 0)
	err = db.Where("purchase_id = ?", purchaseId).Find(&list).Error
	return list, err
}