package logic

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

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

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

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

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

var defaultSteps = []struct {
	Type  string
	Order int64
}{
	{"confirm", 1},
	{"yarn_purchase", 2},
	{"dyeing", 3},
	{"machine_start", 4},
	{"fabric_warehouse", 5},
}

func (l *CreateProductionPlanLogic) CreateProductionPlan(in *pb.CreateProductionPlanReq) (*pb.IdResp, error) {
	tenantId := tenantctx.ExtractTenantId(l.ctx)

	// Generate plan code PP-YYYYMMDD-XXXX
	today := time.Now().Format("20060102")
	count, err := l.svcCtx.PlanModel.CountTodayPlans(l.ctx, tenantId, time.Now().Format("2006-01-02"))
	if err != nil {
		return nil, err
	}
	planCode := fmt.Sprintf("PP-%s-%04d", today, count+1)

	targetQty, _ := strconv.ParseFloat(in.TargetQuantity, 64)
	yarnUsage, _ := strconv.ParseFloat(in.YarnUsagePerMeter, 64)
	price, _ := strconv.ParseFloat(in.ProductionPrice, 64)

	var startTime sql.NullTime
	if in.StartTime != "" {
		if t, err := time.Parse("2006-01-02", in.StartTime); err == nil {
			startTime = sql.NullTime{Time: t, Valid: true}
		}
	}

	planId := uid.Generate()
	_, err = l.svcCtx.PlanModel.Insert(l.ctx, &model.ProProductionPlan{
		PlanId:            planId,
		TenantId:          tenantId,
		PlanCode:          planCode,
		ProductId:         in.ProductId,
		ProductName:       in.ProductName,
		Color:             in.Color,
		FabricCode:        in.FabricCode,
		ColorCode:         in.ColorCode,
		TargetQuantity:    targetQty,
		YarnUsagePerMeter: yarnUsage,
		ProductionPrice:   price,
		SupplierId:        in.SupplierId,
		Status:            0, // draft
		Remark:            sql.NullString{String: in.Remark, Valid: in.Remark != ""},
		StartTime:         startTime,
		Creator:           tenantId,
		Operator:          tenantId,
	})
	if err != nil {
		return nil, err
	}

	// Create yarn ratios
	if len(in.YarnRatios) > 0 {
		ratios := make([]*model.ProPlanYarnRatio, 0, len(in.YarnRatios))
		for _, yr := range in.YarnRatios {
			ratio, _ := strconv.ParseFloat(yr.Ratio, 64)
			amtPerM, _ := strconv.ParseFloat(yr.AmountPerMeter, 64)
			ratios = append(ratios, &model.ProPlanYarnRatio{
				RatioId:        uid.Generate(),
				PlanId:         planId,
				YarnName:       yr.YarnName,
				Ratio:          ratio,
				AmountPerMeter: amtPerM,
				TotalAmount:    amtPerM * targetQty,
			})
		}
		if err := l.svcCtx.YarnRatioModel.BulkInsert(l.ctx, ratios); err != nil {
			return nil, err
		}
	}

	// Initialize 5 process steps
	steps := make([]*model.ProPlanProcessStep, 0, len(defaultSteps))
	for _, ds := range defaultSteps {
		steps = append(steps, &model.ProPlanProcessStep{
			StepId:    uid.Generate(),
			PlanId:    planId,
			StepType:  ds.Type,
			StepOrder: ds.Order,
			Status:    0, // pending
		})
	}
	if err := l.svcCtx.ProcessStepModel.BulkInsert(l.ctx, steps); err != nil {
		return nil, err
	}

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