package dto

import (
	"time"

	entity "gitlab.com/mbugroup/lti-api.git/internal/entities"
	approvalDTO "gitlab.com/mbugroup/lti-api.git/internal/modules/approvals/dto"
	areaDTO "gitlab.com/mbugroup/lti-api.git/internal/modules/master/areas/dto"
	locationDTO "gitlab.com/mbugroup/lti-api.git/internal/modules/master/locations/dto"
	productDTO "gitlab.com/mbugroup/lti-api.git/internal/modules/master/products/dto"
	supplierDTO "gitlab.com/mbugroup/lti-api.git/internal/modules/master/suppliers/dto"
	warehouseDTO "gitlab.com/mbugroup/lti-api.git/internal/modules/master/warehouses/dto"
)

type PurchaseListItemDTO struct {
	Id         uint64                           `json:"id"`
	PrNumber   string                           `json:"pr_number"`
	PoNumber   *string                          `json:"po_number"`
	Supplier   *supplierDTO.SupplierRelationDTO `json:"supplier"`
	CreditTerm *int                             `json:"credit_term"`
	DueDate    *time.Time                       `json:"due_date"`
	PoDate     *time.Time                       `json:"po_date"`
	GrandTotal float64                          `json:"grand_total"`
	Notes      *string                          `json:"notes"`
	CreatedAt  time.Time                        `json:"created_at"`
	UpdatedAt  time.Time                        `json:"updated_at"`
	Approval   *approvalDTO.ApprovalRelationDTO `json:"approval"`
}

type PurchaseDetailDTO struct {
	Id         uint64                           `json:"id"`
	PrNumber   string                           `json:"pr_number"`
	PoNumber   *string                          `json:"po_number"`
	Supplier   *supplierDTO.SupplierRelationDTO `json:"supplier"`
	CreditTerm *int                             `json:"credit_term"`
	DueDate    *time.Time                       `json:"due_date"`
	PoDate     *time.Time                       `json:"po_date"`
	GrandTotal float64                          `json:"grand_total"`
	Notes      *string                          `json:"notes"`
	Items      []PurchaseItemDTO                `json:"items"`
	CreatedAt  time.Time                        `json:"created_at"`
	UpdatedAt  time.Time                        `json:"updated_at"`
	Approval   *approvalDTO.ApprovalRelationDTO `json:"approval"`
}

type PurchaseItemDTO struct {
	Id                 uint64                             `json:"id"`
	ProductID          uint64                             `json:"product_id"`
	Product            *productDTO.ProductRelationDTO     `json:"product"`
	WarehouseID        uint64                             `json:"warehouse_id"`
	Warehouse          *warehouseDTO.WarehouseRelationDTO `json:"warehouse"`
	ProductWarehouseID *uint64                            `json:"product_warehouse_id"`
	SubQty             float64                            `json:"sub_qty"`
	TotalQty           float64                            `json:"total_qty"`
	TotalUsed          float64                            `json:"total_used"`
	Price              float64                            `json:"price"`
	TotalPrice         float64                            `json:"total_price"`
	ReceivedDate       *time.Time                         `json:"received_date"`
	TravelNumber       *string                            `json:"travel_number"`
	TravelDocumentPath *string                            `json:"travel_document_path"`
	VehicleNumber      *string                            `json:"vehicle_number"`
}

func ToPurchaseItemDTO(item entity.PurchaseItem) PurchaseItemDTO {
	dto := PurchaseItemDTO{
		Id:                 item.Id,
		ProductID:          item.ProductId,
		ProductWarehouseID: item.ProductWarehouseId,
		WarehouseID:        item.WarehouseId,
		SubQty:             item.SubQty,
		TotalQty:           item.TotalQty,
		TotalUsed:          item.TotalUsed,
		Price:              item.Price,
		TotalPrice:         item.TotalPrice,
		ReceivedDate:       item.ReceivedDate,
		TravelNumber:       item.TravelNumber,
		TravelDocumentPath: item.TravelNumberDocs,
		VehicleNumber:      item.VehicleNumber,
	}
	if item.Product != nil && item.Product.Id != 0 {
		summary := productDTO.ToProductRelationDTO(*item.Product)
		dto.Product = &summary
	}
	if item.Warehouse != nil && item.Warehouse.Id != 0 {
		summary := warehouseDTO.ToWarehouseRelationDTO(*item.Warehouse)
		if item.Warehouse.Area.Id != 0 {
			areaSummary := areaDTO.ToAreaRelationDTO(item.Warehouse.Area)
			summary.Area = &areaSummary
		}
		if item.Warehouse.Location != nil && item.Warehouse.Location.Id != 0 {
			locationSummary := locationDTO.ToLocationRelationDTO(*item.Warehouse.Location)
			summary.Location = &locationSummary
		}
		dto.Warehouse = &summary
	}
	return dto
}

func ToPurchaseItemDTOs(items []entity.PurchaseItem) []PurchaseItemDTO {
	result := make([]PurchaseItemDTO, len(items))
	for i, item := range items {
		result[i] = ToPurchaseItemDTO(item)
	}
	return result
}

func ToPurchaseDetailDTO(p entity.Purchase) PurchaseDetailDTO {
	dto := PurchaseDetailDTO{
		Id:         p.Id,
		PrNumber:   p.PrNumber,
		PoNumber:   p.PoNumber,
		Supplier:   mapSupplier(p.Supplier),
		CreditTerm: p.CreditTerm,
		DueDate:    p.DueDate,
		PoDate:     p.PoDate,
		GrandTotal: p.GrandTotal,
		Notes:      p.Notes,
		Items:      ToPurchaseItemDTOs(p.Items),
		CreatedAt:  p.CreatedAt,
		UpdatedAt:  p.UpdatedAt,
	}
	if approval := toPurchaseApprovalDTO(p); approval != nil {
		dto.Approval = approval
	}
	return dto
}

func ToPurchaseListDTO(p entity.Purchase) PurchaseListItemDTO {
	dto := PurchaseListItemDTO{
		Id:         p.Id,
		PrNumber:   p.PrNumber,
		PoNumber:   p.PoNumber,
		Supplier:   mapSupplier(p.Supplier),
		CreditTerm: p.CreditTerm,
		DueDate:    p.DueDate,
		PoDate:     p.PoDate,
		GrandTotal: p.GrandTotal,
		Notes:      p.Notes,
		CreatedAt:  p.CreatedAt,
		UpdatedAt:  p.UpdatedAt,
	}
	if approval := toPurchaseApprovalDTO(p); approval != nil {
		dto.Approval = approval
	}
	return dto
}

func mapSupplier(s entity.Supplier) *supplierDTO.SupplierRelationDTO {
	if s.Id == 0 {
		return nil
	}
	summary := supplierDTO.ToSupplierRelationDTO(s)
	return &summary
}

func ToPurchaseListDTOs(items []entity.Purchase) []PurchaseListItemDTO {
	if len(items) == 0 {
		return nil
	}
	result := make([]PurchaseListItemDTO, len(items))
	for i, item := range items {
		result[i] = ToPurchaseListDTO(item)
	}
	return result
}

func toPurchaseApprovalDTO(p entity.Purchase) *approvalDTO.ApprovalRelationDTO {
	if p.LatestApproval == nil || p.LatestApproval.Id == 0 {
		return nil
	}
	mapped := approvalDTO.ToApprovalDTO(*p.LatestApproval)
	return &mapped
}