minstrel/internal/lidarr/lookup_mbid.go

package lidarr

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

// LookupArtistByMBID returns the artist Lidarr has indexed under that
// MBID. Returns ErrNotFound if Lidarr returns an empty array.
func (c *Client) LookupArtistByMBID(ctx context.Context, mbid string) (LidarrArtist, error) {
	if mbid == "" {
		return LidarrArtist{}, fmt.Errorf("lidarr: empty mbid")
	}
	q := url.Values{"mbId": []string{mbid}}
	resp, err := c.get(ctx, "/api/v1/artist", q)
	if err != nil {
		return LidarrArtist{}, err
	}
	defer func() { _ = resp.Body.Close() }()

	var rows []LidarrArtist
	if err := json.NewDecoder(resp.Body).Decode(&rows); err != nil {
		return LidarrArtist{}, fmt.Errorf("%w: decode artist: %v", ErrInvalidPayload, err)
	}
	if len(rows) == 0 {
		return LidarrArtist{}, ErrNotFound
	}
	return rows[0], nil
}

// LookupAlbumByMBID returns the album Lidarr has indexed under that
// MBID. Returns ErrNotFound on empty result.
func (c *Client) LookupAlbumByMBID(ctx context.Context, mbid string) (LidarrAlbum, error) {
	if mbid == "" {
		return LidarrAlbum{}, fmt.Errorf("lidarr: empty mbid")
	}
	q := url.Values{"foreignAlbumId": []string{mbid}}
	resp, err := c.get(ctx, "/api/v1/album", q)
	if err != nil {
		return LidarrAlbum{}, err
	}
	defer func() { _ = resp.Body.Close() }()

	var rows []LidarrAlbum
	if err := json.NewDecoder(resp.Body).Decode(&rows); err != nil {
		return LidarrAlbum{}, fmt.Errorf("%w: decode album: %v", ErrInvalidPayload, err)
	}
	if len(rows) == 0 {
		return LidarrAlbum{}, ErrNotFound
	}
	return rows[0], nil
}

// lookupAlbumResource fetches the album resource Lidarr's metadata holds
// under mbid (GET /api/v1/album/lookup?term=lidarr:<mbid>), kept as raw
// JSON so AddAlbum can POST it back with every field Lidarr sent — the
// round trip Lidarr's own add-album UI makes. Returns ErrNotFound when no
// result carries that MBID.
func (c *Client) lookupAlbumResource(ctx context.Context, mbid string) (map[string]any, error) {
	if mbid == "" {
		return nil, fmt.Errorf("lidarr: empty album mbid")
	}
	resp, err := c.get(ctx, "/api/v1/album/lookup", url.Values{"term": {"lidarr:" + mbid}})
	if err != nil {
		return nil, err
	}
	defer func() { _ = resp.Body.Close() }()

	var rows []map[string]any
	if err := json.NewDecoder(resp.Body).Decode(&rows); err != nil {
		return nil, fmt.Errorf("%w: decode album lookup: %v", ErrInvalidPayload, err)
	}
	for _, row := range rows {
		if id, _ := row["foreignAlbumId"].(string); id == mbid {
			return row, nil
		}
	}
	return nil, fmt.Errorf("%w: album %s in Lidarr's metadata", ErrNotFound, mbid)
}