lc_finance/server/dao/godown/manifest.go

package godown

import (
	"errors"
	"fmt"
	"gorm.io/gorm"
	"server/global"
)

type Manifest struct {
	global.GVA_MODEL
	ManifestGenre string  `json:"manifestGenre" gorm:"comment:'货单类型'"`
	Title         string  `json:"title" gorm:"comment:'标题'"`
	Cargos        []Cargo `json:"cargos" gorm:"foreignKey:ManifestId"`
	Custodian     string  `json:"custodian" gorm:"comment:负责人"`
	Remarks       string  `json:"remarks" gorm:"comment:'备注'"`
}

func (Manifest) TableName() string {
	return "manifest"
}

func QueryAllManifest() (manifests []Manifest, err error) {
	err = global.GVA_DB.Model(&Manifest{}).Find(&manifests).Error
	return
}

func QueryManifestList(limit, offset int, genre, title string) (manifests []Manifest, total int64, err error) {
	// 创建db
	db := global.GVA_DB.Model(&Manifest{})
	// 如果有条件搜索 下方会自动创建搜索语句

	if genre != "" {
		db = db.Where("manifest_genre LIKE ?", "%"+genre+"%")
	}
	if title != "" {
		db = db.Where("title LIKE ?", "%"+title+"%")
	}

	err = db.Count(&total).Error
	if err != nil {
		return
	}
	err = db.Order("id desc").Limit(limit).Offset(offset).Preload("Cargos").Preload("Cargos.Commodity").Preload("Cargos.Warehouse").Find(&manifests).Error
	return manifests, total, err
}

func (m Manifest) CreateManifest() error {
	return global.GVA_DB.Create(&m).Error
}

func (m Manifest) UpdateManifest() error {
	return global.GVA_DB.Where("id = ?", m.ID).Updates(&m).Error
}

func DeleteManifest(id int) error {
	return global.GVA_DB.Where("id = ?", id).Unscoped().Delete(&Manifest{}).Error
}

// CreateInboundManifest 入库
func CreateInboundManifest(manifestGenre, title, custodian string, cargos []Cargo) error {
	// 开启事务
	return global.GVA_DB.Transaction(func(tx *gorm.DB) error {
		// 1. 创建入库货单
		manifest := Manifest{
			ManifestGenre: manifestGenre, // 如 "采购入库"
			Title:         title,
			Custodian:     custodian,
			Cargos:        cargos,
		}
		if err := tx.Create(&manifest).Error; err != nil {
			return fmt.Errorf("创建货单失败: %v", err)
		}

		// 2. 更新库存（逐个货物处理）
		for _, cargo := range manifest.Cargos {
			// 检查是否已存在相同商品、仓库、库区、库位的记录
			var goods Goods
			err := tx.Where("good_id = ?",
				cargo.GoodsId).
				First(&goods).Error

			if err == nil {
				// 存在记录：增加数量
				goods.Number += cargo.Number
				if err := tx.Save(&goods).Error; err != nil {
					return fmt.Errorf("更新库存失败: %v", err)
				}
			} else if errors.Is(err, gorm.ErrRecordNotFound) {
				// 不存在记录
				return fmt.Errorf("查询库存失败: %v", err)
			} else {
				return fmt.Errorf("查询库存失败: %v", err)
			}
		}
		return nil
	})
}

// CreateOutboundManifest 出库
func CreateOutboundManifest(manifestGenre, title, custodian string, cargos []Cargo) error {
	// 开启事务
	return global.GVA_DB.Transaction(func(tx *gorm.DB) error {
		// 1. 检查库存是否充足（预扣减检查）
		for _, cargo := range cargos {
			var goods Goods
			if err := tx.Where("good_id = ?",
				cargo.GoodsId).
				First(&goods).Error; err != nil {
				return fmt.Errorf("库存记录不存在: %v", err)
			}
			if goods.Number < cargo.Number {
				return fmt.Errorf("商品 %v 库存不足（当前: %d，需要: %d）",
					cargo.Goods.Name, goods.Number, cargo.Number)
			}
		}

		// 2. 创建出库货单
		manifest := Manifest{
			ManifestGenre: manifestGenre, // 如 "销售出库"
			Title:         title,
			Custodian:     custodian,
			Cargos:        cargos,
		}
		if err := tx.Create(&manifest).Error; err != nil {
			return fmt.Errorf("创建货单失败: %v", err)
		}

		// 3. 扣减库存
		for _, cargo := range manifest.Cargos {
			if err := tx.Model(&Goods{}).
				Where("goods_id = ?",
					cargo.GoodsId).
				Update("number", gorm.Expr("number - ?", cargo.Number)).
				Error; err != nil {
				return fmt.Errorf("扣减库存失败: %v", err)
			}
		}
		return nil
	})
}