package mrktplaats

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

// RelevantService retrieves similar/related listings.
type RelevantService struct {
	t *transport
}

// SimilarAdCore is the ad core from the older API3 format (snake_case).
type SimilarAdCore struct {
	ID      string           `json:"id"`
	Title   string           `json:"title"`
	Picture DiscoveryPicture `json:"picture"`
	Price   DiscoveryPrice   `json:"price"`
}

// SimilarItem is a related listing.
type SimilarItem struct {
	AdCore       SimilarAdCore `json:"ad_core"`
	PageLocation string        `json:"page_location"`
}

// SimilarAdsResponse contains similar listings.
type SimilarAdsResponse struct {
	Items      []SimilarItem `json:"items"`
	ResultType string        `json:"result_type"`
}

// Get returns similar/related listings for a given listing.
func (s *RelevantService) Get(ctx context.Context, listingID string, sellerID string, categoryID int) (*SimilarAdsResponse, error) {
	path := fmt.Sprintf("/api3/ads/relevant/%s.json", listingID)
	params := url.Values{}
	if sellerID != "" {
		params.Set("seller_id", sellerID)
	}
	params.Set("category_id", fmt.Sprintf("%d", categoryID))
	var resp SimilarAdsResponse
	if err := s.t.get(ctx, path, params, &resp); err != nil {
		return nil, err
	}
	return &resp, nil
}