// 单位换算DAO层
// 职责：换算规则CRUD、按单位类型和源目标单位查询
// 紧密耦合：service.UnitConversion、service.Capacity(容量计算换算)
// 注意：GetByUnits用于容量计算时获取换算系数
package dao

import (
	"assets/consts/public"
	"assets/consts/stock"
	entity "assets/model/entity/stock"
	"context"

	"gitea.com/red-future/common/db/mongo"
	"go.mongodb.org/mongo-driver/v2/bson"
)

var UnitConversion = new(unitConversion)

type unitConversion struct{}

// GetByUnits 根据单位类型和源目标单位查询换算规则
func (d *unitConversion) GetByUnits(ctx context.Context, unitType stock.CapacityUnitType, fromUnit, toUnit string) (res *entity.UnitConversion, err error) {
	filter := bson.M{
		"unitType": unitType,
		"fromUnit": fromUnit,
		"toUnit":   toUnit,
	}
	err = mongo.DB().FindOne(ctx, filter, &res, public.UnitConversionCollection)
	return
}

// Insert 插入换算规则
func (d *unitConversion) Insert(ctx context.Context, conversion *entity.UnitConversion) (ids []interface{}, err error) {
	ids, err = mongo.DB().Insert(ctx, []interface{}{conversion}, public.UnitConversionCollection)
	return
}

// Update 更新换算规则
func (d *unitConversion) Update(ctx context.Context, id *bson.ObjectID, update bson.M) (err error) {
	filter := bson.M{"_id": id}
	updateDoc := bson.M{"$set": update}
	_, err = mongo.DB().Update(ctx, filter, updateDoc, public.UnitConversionCollection)
	return
}

// DeleteFake 软删除换算规则
func (d *unitConversion) DeleteFake(ctx context.Context, id *bson.ObjectID) (err error) {
	filter := bson.M{"_id": id}
	_, err = mongo.DB().DeleteSoft(ctx, filter, public.UnitConversionCollection)
	return
}

// List 查询换算规则列表
func (d *unitConversion) List(ctx context.Context, unitType *stock.CapacityUnitType, fromUnit, toUnit string) (res []entity.UnitConversion, err error) {
	filter := bson.M{}

	if unitType != nil {
		filter["unitType"] = *unitType
	}
	if fromUnit != "" {
		filter["fromUnit"] = fromUnit
	}
	if toUnit != "" {
		filter["toUnit"] = toUnit
	}

	_, err = mongo.DB().Find(ctx, filter, &res, public.UnitConversionCollection, nil, nil)
	return
}