package logic

import (
	"context"
	"strconv"

	"lone-services/pkg/modelbase"
	"lone-services/pkg/utils"
	"lone-services/pkg/validate"
	product "lone-services/rpc/product/pb"
	"lone-services/services/product/internal/dao"
	"lone-services/services/product/internal/model"
	"lone-services/services/product/internal/svc"
	"lone-services/services/product/validator"

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

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

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

// Number 服务间增减库存：type=1 增加，type=2 减少
func (l *NumberLogic) Number(in *product.NumberReq) (*emptypb.Empty, error) {
	var req validator.ProductNumberValidator
	if msg := validate.ValidateFromProto(in, &req); msg != utils.StringEmpty {
		return nil, status.Error(codes.InvalidArgument, msg)
	}

	if err := changeProductNumber(l.Logger, req.Id, req.Type, req.Number); err != nil {
		return nil, err
	}
	return &emptypb.Empty{}, nil
}

func changeProductNumber(logger logx.Logger, id int64, typ uint32, number uint32) error {
	var info dao.NumberInfo
	w := modelbase.Params{
		Eq: map[string]string{"id": strconv.FormatInt(id, 10)},
	}
	m := model.ProductModel{}.Init()
	if err := m.GetOne(w, &info); err != nil {
		logger.Errorf("product number get: %v", err)
		return status.Error(codes.Internal, utils.Fail.Msg)
	}
	if info.Id < 1 {
		return status.Error(codes.NotFound, utils.ErrorNotFund.Msg)
	}

	var (
		rows int64
		err  error
	)
	switch typ {
	case dao.NumberTypeAdd:
		rows, err = m.IncrNumber(id, number)
	case dao.NumberTypeSub:
		rows, err = m.DecrNumber(id, number)
	default:
		return status.Error(codes.InvalidArgument, utils.ErrorParams.Msg)
	}
	if err != nil {
		logger.Errorf("product number change: %v", err)
		return status.Error(codes.Internal, utils.Fail.Msg)
	}
	if rows < 1 {
		if typ == dao.NumberTypeSub {
			return status.Error(codes.FailedPrecondition, utils.ErrorStockNotEnough.Msg)
		}
		return status.Error(codes.Internal, utils.Fail.Msg)
	}
	return nil
}