package dto

import (
	"time"

	entity "gitlab.com/mbugroup/lti-api.git/internal/entities"
	userDTO "gitlab.com/mbugroup/lti-api.git/internal/modules/users/dto"
)

// === DTO Structs ===

type TransferRelationDTO struct {
	Id                   uint64              `json:"id"`
	TransferReason       string              `json:"transfer_reason"`
	TransferDate         string              `json:"transfer_date"`
	SourceWarehouse      *WarehouseDetailDTO `json:"source_warehouse,omitempty"`
	DestinationWarehouse *WarehouseDetailDTO `json:"destination_warehouse,omitempty"`
}

// Only id and name for warehouse simple view
type WarehouseSimpleDTO struct {
	Id   uint   `json:"id"`
	Name string `json:"name"`
}

type ProductSimpleDTO struct {
	Id   uint   `json:"id"`
	Name string `json:"name"`
}

type AreaDTO struct {
	Id   uint   `json:"id"`
	Name string `json:"name"`
}

type LocationDTO struct {
	Id   uint   `json:"id"`
	Name string `json:"name"`
}

type SupplierSimpleDTO struct {
	Id   uint   `json:"id"`
	Name string `json:"name"`
}

type WarehouseDetailDTO struct {
	Id       uint         `json:"id"`
	Name     string       `json:"name"`
	Location *LocationDTO `json:"location"`
	Area     *AreaDTO     `json:"area"`
}

type TransferListDTO struct {
	TransferRelationDTO
	CreatedUser *userDTO.UserRelationDTO `json:"created_user,omitempty"`
	CreatedAt   time.Time                `json:"created_at"`
	UpdatedAt   time.Time                `json:"updated_at"`
	Details     []TransferDetailItemDTO  `json:"details"`
	Deliveries  []TransferDeliveryDTO    `json:"deliveries"`
}

type TransferDetailDTO struct {
	TransferListDTO
	Details    []TransferDetailItemDTO `json:"details"`
	Deliveries []TransferDeliveryDTO   `json:"deliveries"`
}

// Detail produk
type TransferDetailItemDTO struct {
	Id       uint64           `json:"id"`
	Proudct  ProductSimpleDTO `json:"product"`
	Quantity float64          `json:"quantity"`
}

// Delivery ekspedisi
type TransferDeliveryDTO struct {
	Id                uint64                    `json:"id"`
	Supplier          SupplierSimpleDTO         `json:"supplier"`
	VehiclePlate      string                    `json:"vehicle_plate"`
	DriverName        string                    `json:"driver_name"`
	DocumentNumber    string                    `json:"document_number"`
	DocumentPath      string                    `json:"document_path"`
	ShippingCostItem  float64                   `json:"shipping_cost_item"`
	ShippingCostTotal float64                   `json:"shipping_cost_total"`
	Items             []TransferDeliveryItemDTO `json:"items"`
}

type TransferDeliveryItemDTO struct {
	Id                    uint64  `json:"id"`
	StockTransferDetailId uint64  `json:"stock_transfer_detail_id"`
	Quantity              float64 `json:"quantity"`
}

// === Mapper Functions ===

func ToTransferRelationDTO(e entity.StockTransfer) TransferRelationDTO {

	var sourceWarehouse *WarehouseDetailDTO
	if e.FromWarehouse != nil && e.FromWarehouse.Id != 0 {
		sourceWarehouse = toWarehouseDetailDTO(e.FromWarehouse)
	}
	var destinationWarehouse *WarehouseDetailDTO
	if e.ToWarehouse != nil && e.ToWarehouse.Id != 0 {
		destinationWarehouse = toWarehouseDetailDTO(e.ToWarehouse)
	}
	return TransferRelationDTO{
		Id:                   e.Id,
		TransferReason:       e.Reason,
		TransferDate:         e.CreatedAt.Format("2006-01-02"),
		SourceWarehouse:      sourceWarehouse,
		DestinationWarehouse: destinationWarehouse,
	}
}

func toAreaDTO(a *entity.Area) *AreaDTO {
	if a == nil {
		return nil
	}
	return &AreaDTO{
		Id:   a.Id,
		Name: a.Name,
	}
}

func toLocationDTO(l *entity.Location) *LocationDTO {
	if l == nil {
		return nil
	}
	return &LocationDTO{
		Id:   l.Id,
		Name: l.Name,
	}
}

func toWarehouseDetailDTO(w *entity.Warehouse) *WarehouseDetailDTO {
	if w == nil {
		return nil
	}
	return &WarehouseDetailDTO{
		Id:       w.Id,
		Name:     w.Name,
		Location: toLocationDTO(w.Location),
		Area:     toAreaDTO(&w.Area), // Ambil area langsung dari warehouse (area_id)
	}
}

func ToTransferListDTO(e entity.StockTransfer) TransferListDTO {
	var createdUser *userDTO.UserRelationDTO
	if e.CreatedUser != nil {
		mapped := userDTO.ToUserRelationDTO(*e.CreatedUser)
		createdUser = &mapped
	}
	// Map details
	var details []TransferDetailItemDTO
	for _, d := range e.Details {
		details = append(details, TransferDetailItemDTO{
			Id: d.Id,
			Proudct: ProductSimpleDTO{
				Id:   d.Product.Id,
				Name: d.Product.Name,
			},
			Quantity: d.Quantity,
		})
	}
	// Map deliveries
	var deliveries []TransferDeliveryDTO
	for _, del := range e.Deliveries {
		// Map delivery items
		var items []TransferDeliveryItemDTO
		for _, item := range del.Items {
			items = append(items, TransferDeliveryItemDTO{
				Id:                    item.Id,
				StockTransferDetailId: item.StockTransferDetailId,
				Quantity:              item.Quantity,
			})
		}
		deliveries = append(deliveries, TransferDeliveryDTO{
			Id: del.Id,
			Supplier: SupplierSimpleDTO{
				Id:   del.Supplier.Id,
				Name: del.Supplier.Name,
			},
			VehiclePlate:      del.VehiclePlate,
			DriverName:        del.DriverName,
			DocumentNumber:    del.DocumentNumber,
			DocumentPath:      del.DocumentPath,
			ShippingCostItem:  del.ShippingCostItem,
			ShippingCostTotal: del.ShippingCostTotal,
			Items:             items,
		})
	}
	return TransferListDTO{
		TransferRelationDTO: ToTransferRelationDTO(e),
		CreatedUser:         createdUser,
		CreatedAt:           e.CreatedAt,
		UpdatedAt:           e.UpdatedAt,
		Details:             details,
		Deliveries:          deliveries,
	}
}

func ToTransferListDTOs(e []entity.StockTransfer) []TransferListDTO {
	result := make([]TransferListDTO, len(e))
	for i, r := range e {
		result[i] = ToTransferListDTO(r)
	}
	return result
}

func ToTransferDetailDTO(e entity.StockTransfer) TransferDetailDTO {
	// Map details
	var details []TransferDetailItemDTO
	for _, d := range e.Details {
		details = append(details, TransferDetailItemDTO{
			Id: d.Id,
			Proudct: ProductSimpleDTO{
				Id:   d.Product.Id,
				Name: d.Product.Name,
			},
			Quantity: d.Quantity,
		})
	}
	// Map deliveries
	var deliveries []TransferDeliveryDTO
	for _, del := range e.Deliveries {
		deliveries = append(deliveries, TransferDeliveryDTO{
			Id: del.Id,
			Supplier: SupplierSimpleDTO{
				Id:   del.Supplier.Id,
				Name: del.Supplier.Name,
			},
			VehiclePlate:      del.VehiclePlate,
			DriverName:        del.DriverName,
			DocumentNumber:    del.DocumentNumber,
			DocumentPath:      del.DocumentPath,
			ShippingCostItem:  del.ShippingCostItem,
			ShippingCostTotal: del.ShippingCostTotal,
		})
	}
	return TransferDetailDTO{
		TransferListDTO: ToTransferListDTO(e),
		Details:         details,
		Deliveries:      deliveries,
	}
}