package logic

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

	"muyu-apiserver/model"
	"muyu-apiserver/pkg/metrics"
	"muyu-apiserver/pkg/tenantctx"
	"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 CreateProductLogic struct {
	ctx    context.Context
	svcCtx *svc.ServiceContext
	logx.Logger
}

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

func (l *CreateProductLogic) CreateProduct(in *pb.CreateProductReq) (*pb.IdResp, error) {
	tenantId := tenantctx.ExtractTenantId(l.ctx)
	productId := uid.Generate()
	salesPrice, _ := strconv.ParseFloat(in.SalesPrice, 64)

	product := &model.InvProduct{
		ProductId:   productId,
		TenantId:    tenantId,
		ProductName: in.ProductName,
		ImageUrl:    in.ImageUrl,
		Spec:        in.Spec,
		Color:       in.Color,
		SalesPrice:  salesPrice,
		Remark:      sql.NullString{String: in.Remark, Valid: in.Remark != ""},
		Status:      1,
	}

	_, err := l.svcCtx.ProductModel.Insert(l.ctx, product)
	if err != nil {
		return nil, status.Error(codes.Internal, err.Error())
	}
	var totalLengthM float64
	var totalBolts int

	if len(in.Pans) > 0 {
		pans := make([]*model.InvProductPan, 0, len(in.Pans))
		for i, panInput := range in.Pans {
			panId := uid.Generate()
			pans = append(pans, &model.InvProductPan{
				PanId:     panId,
				ProductId: productId,
				Name:      panInput.Name,
				Position:  panInput.Position,
				SortOrder: int64(i + 1),
			})

			if len(panInput.BoltLengths) > 0 {
				bolts := make([]*model.InvProductBolt, 0, len(panInput.BoltLengths))
				for j, lengthStr := range panInput.BoltLengths {
					lengthM, _ := strconv.ParseFloat(lengthStr, 64)
					totalLengthM += lengthM
					bolts = append(bolts, &model.InvProductBolt{
						BoltId:    uid.Generate(),
						PanId:     panId,
						LengthM:   lengthM,
						SortOrder: int64(j + 1),
					})
				}
				totalBolts += len(panInput.BoltLengths)
				if err := l.svcCtx.BoltModel.BulkReplace(l.ctx, panId, "", bolts); err != nil {
					l.Errorf("create bolts for pan %s failed: %v", panId, err)
				}
			}
		}
		if err := l.svcCtx.PanModel.BulkReplace(l.ctx, productId, "", pans); err != nil {
			l.Errorf("create pans for product %s failed: %v", productId, err)
		}
	}

	metrics.ProductCreatedTotal.WithLabelValues(tenantId, in.ProductName, in.Spec, in.Color).Inc()
	if totalLengthM > 0 {
		metrics.InboundLengthMetersTotal.WithLabelValues(tenantId, in.ProductName, in.Color, "create").Add(totalLengthM)
	}
	if totalBolts > 0 {
		metrics.InboundBoltsTotal.WithLabelValues(tenantId, "create").Add(float64(totalBolts))
	}

	return &pb.IdResp{Id: productId}, nil
}