package entities

import (
	"encoding/json"
	"fmt"
	"time"

	"autostore/internal/domain/value_objects"
)

type itemEntityJSON struct {
	ID             string    `json:"id"`
	Name           string    `json:"name"`
	ExpirationDate time.Time `json:"expirationDate"`
	OrderURL       string    `json:"orderUrl"`
	UserID         string    `json:"userId"`
	CreatedAt      time.Time `json:"createdAt"`
}

type ItemEntity struct {
	id             value_objects.ItemID
	name           string
	expirationDate value_objects.ExpirationDate
	orderURL       string
	userID         value_objects.UserID
	createdAt      time.Time
}

func NewItem(id value_objects.ItemID, name string, expirationDate value_objects.ExpirationDate, orderURL string, userID value_objects.UserID) (*ItemEntity, error) {
	if name == "" {
		return nil, ErrInvalidItemName
	}

	if orderURL == "" {
		return nil, ErrInvalidOrderURL
	}

	return &ItemEntity{
		id:             id,
		name:           name,
		expirationDate: expirationDate,
		orderURL:       orderURL,
		userID:         userID,
		createdAt:      time.Now(),
	}, nil
}

func (i *ItemEntity) GetID() value_objects.ItemID {
	return i.id
}

func (i *ItemEntity) GetName() string {
	return i.name
}

func (i *ItemEntity) GetExpirationDate() value_objects.ExpirationDate {
	return i.expirationDate
}

func (i *ItemEntity) ExpirationDate() time.Time {
	return i.expirationDate.Time()
}

func (i *ItemEntity) GetOrderURL() string {
	return i.orderURL
}

func (i *ItemEntity) GetUserID() value_objects.UserID {
	return i.userID
}

func (i *ItemEntity) GetCreatedAt() time.Time {
	return i.createdAt
}

// MarshalJSON implements json.Marshaler interface
func (i *ItemEntity) MarshalJSON() ([]byte, error) {
	return json.Marshal(&itemEntityJSON{
		ID:             i.id.String(),
		Name:           i.name,
		ExpirationDate: i.expirationDate.Time(),
		OrderURL:       i.orderURL,
		UserID:         i.userID.String(),
		CreatedAt:      i.createdAt,
	})
}

// UnmarshalJSON implements json.Unmarshaler interface
func (i *ItemEntity) UnmarshalJSON(data []byte) error {
	var aux itemEntityJSON
	if err := json.Unmarshal(data, &aux); err != nil {
		return err
	}

	id, err := value_objects.NewItemIDFromString(aux.ID)
	if err != nil {
		return fmt.Errorf("invalid item ID: %w", err)
	}

	userID, err := value_objects.NewUserIDFromString(aux.UserID)
	if err != nil {
		return fmt.Errorf("invalid user ID: %w", err)
	}

	expirationDate, err := value_objects.NewExpirationDate(aux.ExpirationDate)
	if err != nil {
		return fmt.Errorf("invalid expiration date: %w", err)
	}

	i.id = id
	i.name = aux.Name
	i.expirationDate = expirationDate
	i.orderURL = aux.OrderURL
	i.userID = userID
	i.createdAt = aux.CreatedAt

	return nil
}