package service

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

	"github.com/google/uuid"
	"github.com/muyuqingfeng/iloom/shared/pkg/database"
	"github.com/muyuqingfeng/iloom/washing-service/internal/model"
	"github.com/muyuqingfeng/iloom/washing-service/internal/repository"
)

type CompleteRequest struct {
	ActualShrinkageRate float64    `json:"actual_shrinkage_rate" binding:"required"`
	ActualWashedMeters  float64    `json:"actual_washed_meters" binding:"required,gt=0"`
	Rolls               int        `json:"rolls" binding:"required,gt=0"`
	WashingDate         *time.Time `json:"washing_date"`
	Notes               string     `json:"notes"`
	WarehouseID         string     `json:"warehouse_id"`
	WarehouseLocation   string     `json:"warehouse_location"`
}

type CompletionService struct {
	completionRepo *repository.CompletionRepo
	planRepo       *repository.PlanRepo
	fpRepo         *repository.FinishedProductRepo
	db             *sql.DB
}

func NewCompletionService(
	cr *repository.CompletionRepo,
	pr *repository.PlanRepo,
	fpr *repository.FinishedProductRepo,
	db *sql.DB,
) *CompletionService {
	return &CompletionService{
		completionRepo: cr,
		planRepo:       pr,
		fpRepo:         fpr,
		db:             db,
	}
}

func (s *CompletionService) Complete(
	ctx context.Context,
	washingPlanID, companyID, userID string,
	req CompleteRequest,
) (*model.WashingPlanCompletion, error) {
	plan, err := s.planRepo.GetByID(ctx, washingPlanID)
	if err != nil {
		return nil, fmt.Errorf("get plan: %w", err)
	}
	if plan == nil {
		return nil, fmt.Errorf("washing plan not found")
	}
	if plan.WashingFactoryID == nil || *plan.WashingFactoryID != companyID {
		return nil, fmt.Errorf("washing plan not found")
	}
	if plan.Status == "completed" {
		return nil, fmt.Errorf("washing plan already completed")
	}

	now := time.Now()
	washingDate := now
	if req.WashingDate != nil {
		washingDate = *req.WashingDate
	}

	totalCost := req.ActualWashedMeters * plan.WashingPrice
	var unitCost float64
	if req.ActualWashedMeters > 0 {
		unitCost = totalCost / req.ActualWashedMeters
	}

	completionID := uuid.New().String()
	fpID := uuid.New().String()

	var notes *string
	if req.Notes != "" {
		notes = &req.Notes
	}
	var warehouseID *string
	if req.WarehouseID != "" {
		warehouseID = &req.WarehouseID
	}
	var warehouseLocation *string
	if req.WarehouseLocation != "" {
		warehouseLocation = &req.WarehouseLocation
	}

	completion := &model.WashingPlanCompletion{
		ID:                  completionID,
		WashingPlanID:       washingPlanID,
		CompanyID:           companyID,
		ActualShrinkageRate: req.ActualShrinkageRate,
		ActualWashedMeters:  req.ActualWashedMeters,
		ActualWashingCost:   &totalCost,
		UnitCost:            &unitCost,
		Rolls:               req.Rolls,
		WashingDate:         washingDate,
		Notes:               notes,
		CompletedBy:         &userID,
		CompletedAt:         now,
		FinishedProductID:   &fpID,
		AutoImported:        true,
		WarehouseID:         warehouseID,
		WarehouseLocation:   warehouseLocation,
		CreatedAt:           now,
	}

	err = database.WithTx(ctx, s.db, func(tx *sql.Tx) error {
		if err := s.completionRepo.Create(ctx, tx, completion); err != nil {
			return fmt.Errorf("create completion: %w", err)
		}

		if err := s.planRepo.UpdateActuals(ctx, tx, washingPlanID,
			req.ActualShrinkageRate, req.ActualWashedMeters, totalCost); err != nil {
			return fmt.Errorf("update plan actuals: %w", err)
		}

		fp := &model.FinishedProduct{
			ID:                fpID,
			CompanyID:         companyID,
			ProductName:       plan.ProductName,
			FabricCode:        "",
			Color:             "",
			ShrinkageRate:     req.ActualShrinkageRate,
			WashedMeters:      req.ActualWashedMeters,
			StockMeters:       req.ActualWashedMeters,
			StockRolls:        req.Rolls,
			Rolls:             &req.Rolls,
			WashingCost:       &totalCost,
			UnitCost:          &unitCost,
			Status:            "in_stock",
			Notes:             notes,
			ProductID:         &plan.ProductID,
			WashingPlanID:     &washingPlanID,
			WarehouseID:       warehouseID,
			WarehouseLocation: warehouseLocation,
			CreatedBy:         &userID,
			CreatedAt:         now,
			UpdatedAt:         now,
		}
		if err := s.fpRepo.Create(ctx, tx, fp); err != nil {
			return fmt.Errorf("create finished product: %w", err)
		}

		invRecord := &model.FinishedProductInventoryRecord{
			ID:                  uuid.New().String(),
			FinishedProductID:   fpID,
			CompanyID:           companyID,
			RecordType:          "inbound",
			Rolls:               req.Rolls,
			Meters:              req.ActualWashedMeters,
			Notes:               notes,
			OperatorID:          &userID,
			WarehouseID:         warehouseID,
			WarehouseLocation:   warehouseLocation,
			WashingCompletionID: &completionID,
			CreatedAt:           now,
		}
		if err := s.fpRepo.CreateInventoryRecord(ctx, tx, invRecord); err != nil {
			return fmt.Errorf("create inventory record: %w", err)
		}

		return nil
	})
	if err != nil {
		return nil, err
	}

	return completion, nil
}