package logic

import (
	"context"
	"database/sql"
	"strconv"

	"muyu-apiserver/model"
	"muyu-apiserver/pkg/uid"
	"muyu-apiserver/rpc/inventory/internal/svc"
	"muyu-apiserver/rpc/inventory/pb"

	"github.com/zeromicro/go-zero/core/logx"
	"google.golang.org/grpc/codes"
	"google.golang.org/grpc/status"
)

type UpdateStockCheckLogic struct {
	ctx    context.Context
	svcCtx *svc.ServiceContext
	logx.Logger
}

func NewUpdateStockCheckLogic(ctx context.Context, svcCtx *svc.ServiceContext) *UpdateStockCheckLogic {
	return &UpdateStockCheckLogic{
		ctx:    ctx,
		svcCtx: svcCtx,
		Logger: logx.WithContext(ctx),
	}
}

func (l *UpdateStockCheckLogic) UpdateStockCheck(in *pb.UpdateStockCheckReq) (*pb.Empty, error) {
	check, err := l.svcCtx.StockCheckModel.FindOneByCheckId(l.ctx, in.CheckId)
	if err != nil {
		return nil, status.Error(codes.NotFound, "stock check not found")
	}

	if check.Status == 2 {
		return nil, status.Error(codes.FailedPrecondition, "completed stock check cannot be modified")
	}

	check.Remark = sql.NullString{String: in.Remark, Valid: in.Remark != ""}
	check.Status = 1

	err = l.svcCtx.StockCheckModel.Update(l.ctx, check)
	if err != nil {
		return nil, status.Error(codes.Internal, err.Error())
	}

	err = l.svcCtx.CheckDetailModel.DeleteByCheckId(l.ctx, in.CheckId)
	if err != nil {
		return nil, status.Error(codes.Internal, err.Error())
	}

	details := make([]*model.InvStockCheckDetail, 0, len(in.Details))
	for _, d := range in.Details {
		product, err := l.svcCtx.ProductModel.FindOneByProductId(l.ctx, d.ProductId)
		if err != nil {
			return nil, status.Errorf(codes.NotFound, "product %s not found", d.ProductId)
		}

		actualQty, _ := strconv.ParseFloat(d.ActualQuantity, 64)
		diffQty := actualQty - product.StockQuantity
		diffAmount := diffQty * product.CostPrice

		details = append(details, &model.InvStockCheckDetail{
			DetailId:       uid.Generate(),
			CheckId:        in.CheckId,
			ProductId:      d.ProductId,
			SystemQuantity: product.StockQuantity,
			ActualQuantity: actualQty,
			DiffQuantity:   diffQty,
			DiffAmount:     diffAmount,
			Remark:         sql.NullString{String: d.Remark, Valid: d.Remark != ""},
		})
	}

	err = l.svcCtx.CheckDetailModel.BatchInsert(l.ctx, details)
	if err != nil {
		return nil, status.Error(codes.Internal, err.Error())
	}

	return &pb.Empty{}, nil
}