package mrktplaats

import (
	"context"
	"fmt"
	"net/url"
)

// FavoritesService handles saved/favorite ads.
type FavoritesService struct {
	t *transport
}

// FavoriteItem is a saved ad.
type FavoriteItem struct {
	ItemID       string `json:"itemId"`
	CreationDate string `json:"creationDate"`
}

// FavoritesResponse is the response from listing favorite ads.
type FavoritesResponse struct {
	Items              []FavoriteItem `json:"items"`
	MoreItemsAvailable bool           `json:"moreItemsAvailable"`
	Total              int            `json:"total"`
}

type modifyFavoritesRequest struct {
	AdURNs []string `json:"adUrns"`
}

type modifyFavoritesResponse struct {
	Items []FavoriteItem `json:"items"`
}

// List returns the authenticated user's favorite ads.
func (s *FavoritesService) List(ctx context.Context, limit int) (*FavoritesResponse, error) {
	params := url.Values{}
	if limit > 0 {
		params.Set("limit", fmt.Sprintf("%d", limit))
	}
	var resp FavoritesResponse
	if err := s.t.get(ctx, "/app/favorites/v1/favorite-ads", params, &resp); err != nil {
		return nil, err
	}
	return &resp, nil
}

// Add saves one or more ads to favorites by their URNs.
func (s *FavoritesService) Add(ctx context.Context, urns ...string) ([]FavoriteItem, error) {
	body := modifyFavoritesRequest{AdURNs: urns}
	var resp modifyFavoritesResponse
	if err := s.t.postJSON(ctx, "/app/favorites/v2/favorite-ads", nil, nil, body, &resp); err != nil {
		return nil, err
	}
	return resp.Items, nil
}

// Remove deletes one or more ads from favorites by their URNs.
func (s *FavoritesService) Remove(ctx context.Context, urns ...string) error {
	body := modifyFavoritesRequest{AdURNs: urns}
	return s.t.postJSON(ctx, "/app/favorites/v2/favorite-ads/delete", nil, nil, body, nil)
}