package dto

import (
	"time"

	entity "gitlab.com/mbugroup/lti-api.git/internal/entities"
	deliveryOrdersDTO "gitlab.com/mbugroup/lti-api.git/internal/modules/marketing/dto"
	customerDTO "gitlab.com/mbugroup/lti-api.git/internal/modules/master/customers/dto"
	kandangDTO "gitlab.com/mbugroup/lti-api.git/internal/modules/master/kandangs/dto"
	productDTO "gitlab.com/mbugroup/lti-api.git/internal/modules/master/products/dto"
)

// === Response DTO ===
type SalesDTO struct {
	Id              uint                             `json:"id"`
	RealizationDate time.Time                        `json:"realization_date"`
	Age             int                              `json:"age"`
	DoNumber        string                           `json:"do_number"`
	Product         *productDTO.ProductRelationDTO   `json:"product,omitempty"`
	Customer        *customerDTO.CustomerRelationDTO `json:"customer,omitempty"`
	Qty             float64                          `json:"qty"`
	Weight          float64                          `json:"weight"`
	AvgWeight       float64                          `json:"avg_weight"`
	Price           float64                          `json:"price"`
	TotalPrice      float64                          `json:"total_price"`
	Kandang         *kandangDTO.KandangRelationDTO   `json:"kandang,omitempty"`
	PaymentStatus   string                           `json:"payment_status"`
}

type PenjualanRealisasiResponseDTO struct {
	Sales []SalesDTO `json:"sales"`
}

// === Mapper Functions ===

func ToSalesDTO(e entity.MarketingDeliveryProduct) SalesDTO {

	age := calculateAgeFromChickin(e.MarketingProduct.ProductWarehouse.ProjectFlockKandang, e.DeliveryDate)

	var product *productDTO.ProductRelationDTO
	if e.MarketingProduct.ProductWarehouse.Product.Id != 0 {
		mapped := productDTO.ToProductRelationDTO(e.MarketingProduct.ProductWarehouse.Product)
		product = &mapped
	}

	var customer *customerDTO.CustomerRelationDTO
	if e.MarketingProduct.Marketing.Customer.Id != 0 {
		mapped := customerDTO.ToCustomerRelationDTO(e.MarketingProduct.Marketing.Customer)
		customer = &mapped
	}

	var kandang *kandangDTO.KandangRelationDTO
	if e.MarketingProduct.ProductWarehouse.ProjectFlockKandang != nil && e.MarketingProduct.ProductWarehouse.ProjectFlockKandang.Kandang.Id != 0 {
		mapped := kandangDTO.ToKandangRelationDTO(e.MarketingProduct.ProductWarehouse.ProjectFlockKandang.Kandang)
		kandang = &mapped
	}

	var realizationDate time.Time
	if e.DeliveryDate != nil {
		realizationDate = *e.DeliveryDate
	}

	doNumber := deliveryOrdersDTO.GenerateDeliveryOrderNumber(e.MarketingProduct.Marketing.SoNumber, e.DeliveryDate, e.MarketingProduct.ProductWarehouse.Warehouse.Id)

	return SalesDTO{
		Id:              e.Id,
		RealizationDate: realizationDate,
		Age:             age,
		DoNumber:        doNumber,
		Product:         product,
		Customer:        customer,
		Qty:             e.UsageQty,
		Weight:          e.TotalWeight,
		AvgWeight:       e.AvgWeight,
		Price:           e.UnitPrice,
		TotalPrice:      e.TotalPrice,
		Kandang:         kandang,
		PaymentStatus:   "Paid",
	}
}

func ToSalesDTOs(e []entity.MarketingDeliveryProduct) []SalesDTO {
	result := make([]SalesDTO, len(e))
	for i, r := range e {
		result[i] = ToSalesDTO(r)
	}
	return result
}

func ToPenjualanRealisasiResponseDTO(projectFlockID uint, e []entity.MarketingDeliveryProduct) PenjualanRealisasiResponseDTO {

	return PenjualanRealisasiResponseDTO{

		Sales: ToSalesDTOs(e),
	}
}

func extractPeriodFromRealisasi(realisasi []entity.MarketingDeliveryProduct) int {
	if len(realisasi) > 0 {
		for _, item := range realisasi {
			if item.MarketingProduct.ProductWarehouse.ProjectFlockKandang != nil {
				return item.MarketingProduct.ProductWarehouse.ProjectFlockKandang.Period
			}
		}
	}
	return 0
}

func calculateAgeFromChickin(projectFlockKandang *entity.ProjectFlockKandang, deliveryDate *time.Time) int {
	if projectFlockKandang == nil || deliveryDate == nil || len(projectFlockKandang.Chickins) == 0 {
		return 0
	}

	earliestChickinDate := projectFlockKandang.Chickins[0].ChickInDate
	for _, chickin := range projectFlockKandang.Chickins {
		if chickin.ChickInDate.Before(earliestChickinDate) {
			earliestChickinDate = chickin.ChickInDate
		}
	}

	ageInDays := int(deliveryDate.Sub(earliestChickinDate).Hours() / 24)
	ageInWeeks := ageInDays / 7
	return ageInWeeks
}