package logic

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

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

	"github.com/zeromicro/go-zero/core/logx"
)

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

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

func (l *CreatePurchaseOrderLogic) CreatePurchaseOrder(in *pb.CreatePurchaseOrderReq) (*pb.IdResp, error) {
	tenantId := tenantctx.ExtractTenantId(l.ctx)

	// Generate order number PO-YYYYMMDD-XXXX
	today := time.Now().Format("20060102")
	count, err := l.svcCtx.OrderModel.CountTodayOrders(l.ctx, tenantId, time.Now().Format("2006-01-02"))
	if err != nil {
		return nil, err
	}
	orderNo := fmt.Sprintf("PO-%s-%04d", today, count+1)

	orderDate, err := time.Parse("2006-01-02", in.OrderDate)
	if err != nil {
		orderDate = time.Now()
	}

	// Calculate contract amount from details
	var contractAmount float64
	for _, d := range in.Details {
		qty, _ := strconv.ParseFloat(d.Quantity, 64)
		price, _ := strconv.ParseFloat(d.UnitPrice, 64)
		contractAmount += qty * price
	}

	orderId := uid.Generate()
	_, err = l.svcCtx.OrderModel.Insert(l.ctx, &model.PurPurchaseOrder{
		OrderId:        orderId,
		TenantId:       tenantId,
		OrderNo:        orderNo,
		SupplierId:     in.SupplierId,
		OrderDate:      orderDate,
		ContractAmount: contractAmount,
		PurchaseBy:     in.PurchaseBy,
		Creator:        tenantId,
		Operator:       tenantId,
		Status:         0, // draft
		Remark:         sql.NullString{String: in.Remark, Valid: in.Remark != ""},
	})
	if err != nil {
		return nil, err
	}

	// Create details
	details := make([]*model.PurPurchaseOrderDetail, 0, len(in.Details))
	for _, d := range in.Details {
		qty, _ := strconv.ParseFloat(d.Quantity, 64)
		price, _ := strconv.ParseFloat(d.UnitPrice, 64)
		details = append(details, &model.PurPurchaseOrderDetail{
			DetailId:    uid.Generate(),
			TenantId:    tenantId,
			OrderId:     orderId,
			ProductId:   d.ProductId,
			ProductName: d.ProductName,
			Spec:        d.Spec,
			Color:       d.Color,
			Quantity:    qty,
			UnitPrice:   price,
			Amount:      qty * price,
			Remark:      sql.NullString{String: d.Remark, Valid: d.Remark != ""},
		})
	}
	if err := l.svcCtx.OrderDetailModel.BulkInsert(l.ctx, details); err != nil {
		return nil, err
	}

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