yandex-music-api-go/internal/client/tracks.go

// Package client provides methods for interacting with Yandex Music API endpoints.
package client

import (
	"context"
	"fmt"

	"gitea.mrixs.me/Mrixs/yandex-music-api-go/internal/models"
	"gitea.mrixs.me/Mrixs/yandex-music-api-go/internal/utils"
)

// GetTracks gets tracks by their IDs (GET /tracks).
// Returns a slice of Track pointers, or nil if no IDs are provided.
func (c *Client) GetTracks(ctx context.Context, trackIDs []string) ([]*models.Track, error) {
	if len(trackIDs) == 0 {
		return nil, nil
	}

	params := map[string]string{
		"track-ids": joinIDs(trackIDs),
	}

	var result []models.Track
	if err := c.request.Get(ctx, "/tracks", params, &result); err != nil {
		return nil, err
	}

	tracks := make([]*models.Track, len(result))
	for i := range result {
		result[i].SetClient(c)
		tracks[i] = &result[i]
	}
	return tracks, nil
}

// GetTrack gets a single track by ID using GetTracks.
// Returns an error if no track is found with the given ID.
func (c *Client) GetTrack(ctx context.Context, trackID string) (*models.Track, error) {
	tracks, err := c.GetTracks(ctx, []string{trackID})
	if err != nil {
		return nil, err
	}
	if len(tracks) == 0 {
		return nil, utils.NewYandexMusicError("track not found", utils.ErrNotFound)
	}
	return tracks[0], nil
}

// GetTrackDownloadInfo gets download info for a track (GET /tracks/{track_id}/download-info).
// The quality parameter specifies the desired audio quality (e.g., "mp3").
func (c *Client) GetTrackDownloadInfo(ctx context.Context, trackID, quality string) ([]models.DownloadInfo, error) {
	// This requires signing - use the sign utility
	// For now, return basic implementation
	params := map[string]string{
		"track_id": trackID,
	}

	var result []models.DownloadInfo
	if err := c.request.Get(ctx, fmt.Sprintf("/tracks/%s/download-info", trackID), params, &result); err != nil {
		return nil, err
	}
	return result, nil
}

// DownloadTrack downloads a track by ID.
// It first fetches download info, finds a matching format/bitrate, then downloads the file content.
func (c *Client) DownloadTrack(ctx context.Context, trackID, format string, bitrate int) ([]byte, error) {
	info, err := c.GetTrackDownloadInfo(ctx, trackID, format)
	if err != nil {
		return nil, err
	}

	// Find matching download info
	var url string
	for _, di := range info {
		if di.Codec == format && (bitrate == 0 || di.Bitrate == bitrate) {
			url = di.URL
			break
		}
	}

	if url == "" && len(info) > 0 {
		url = info[0].URL
	}

	if url == "" {
		return nil, utils.NewYandexMusicError("no download URL available", utils.ErrNotFound)
	}

	return c.request.Download(ctx, url)
}

// SearchResult represents search results containing tracks.
type SearchResult struct {
	Tracks *SearchTracksResult `json:"tracks"`
}

// SearchTracksResult represents track search results with total count and results list.
type SearchTracksResult struct {
	Total   int            `json:"total"`
	Results []models.Track `json:"results"`
}

func joinIDs(ids []string) string {
	result := ""
	for i, id := range ids {
		if i > 0 {
			result += ","
		}
		result += id
	}
	return result
}