-- name: UpsertAlbum :one
INSERT INTO albums (title, sort_title, artist_id, release_date, mbid, cover_art_path)
VALUES ($1, $2, $3, $4, $5, $6)
ON CONFLICT (mbid) WHERE mbid IS NOT NULL
DO UPDATE SET
    title = EXCLUDED.title,
    sort_title = EXCLUDED.sort_title,
    artist_id = EXCLUDED.artist_id,
    release_date = EXCLUDED.release_date,
    cover_art_path = EXCLUDED.cover_art_path,
    updated_at = now()
RETURNING *;

-- name: GetAlbumByID :one
SELECT * FROM albums WHERE id = $1;

-- name: GetAlbumByArtistAndTitle :one
-- Scanner uses this for the no-mbid dedupe path: resolve-or-create.
SELECT * FROM albums WHERE artist_id = $1 AND title = $2 LIMIT 1;

-- name: ListAlbumsByArtist :many
SELECT * FROM albums WHERE artist_id = $1 ORDER BY release_date NULLS LAST, sort_title;

-- name: ListAlbumsAlphaByName :many
SELECT * FROM albums ORDER BY sort_title LIMIT $1 OFFSET $2;

-- name: ListAlbumsAlphaByArtist :many
-- Sorted by the owning artist's sort_name. Needed by Subsonic's
-- alphabeticalByArtist album list type.
SELECT sqlc.embed(albums), artists.sort_name AS artist_sort_name
FROM albums
JOIN artists ON artists.id = albums.artist_id
ORDER BY artists.sort_name, albums.sort_title
LIMIT $1 OFFSET $2;

-- name: ListAlbumsNewest :many
SELECT * FROM albums ORDER BY created_at DESC LIMIT $1 OFFSET $2;

-- name: ListAlbumsRandom :many
SELECT * FROM albums ORDER BY random() LIMIT $1;

-- name: ListAlbumsByGenre :many
-- Album "belongs to" a genre if any of its tracks carry that genre.
SELECT DISTINCT ON (albums.id) albums.*
FROM albums
JOIN tracks ON tracks.album_id = albums.id
WHERE tracks.genre = $1
ORDER BY albums.id, albums.sort_title
LIMIT $2 OFFSET $3;

-- name: SearchAlbums :many
SELECT * FROM albums
WHERE title ILIKE '%' || $1 || '%'
ORDER BY sort_title
LIMIT $2 OFFSET $3;

-- name: CountAlbumsMatching :one
SELECT COUNT(*) FROM albums WHERE title ILIKE '%' || $1::text || '%';

-- name: ListRecentlyAddedAlbumsWithArtist :many
-- M6a: recently-added albums joined with artist_name + artist_id for the
-- home-page section. created_at is the row-insert timestamp from the
-- scanner — the closest proxy to "added to library". Stable secondary
-- ordering by id keeps pagination tie-break deterministic.
SELECT sqlc.embed(albums), artists.name AS artist_name
FROM albums
JOIN artists ON artists.id = albums.artist_id
ORDER BY albums.created_at DESC, albums.id
LIMIT $1;

-- name: ListAlbumsAlphaWithArtist :many
-- M6a: alpha-sorted album list joined with artist_name. Used by
-- /api/library/albums for the wrapping-grid page. Stable id-tiebreak.
SELECT sqlc.embed(albums), artists.name AS artist_name
FROM albums
JOIN artists ON artists.id = albums.artist_id
ORDER BY albums.sort_title, albums.id
LIMIT $1 OFFSET $2;

-- name: CountAlbums :one
-- M6a: total album count for the /api/library/albums envelope.
SELECT COUNT(*) FROM albums;

-- name: CountAlbumsByArtist :one
-- Used by request-progress reporting to count how many albums have been
-- ingested for a matched artist while a request is still in flight.
SELECT COUNT(*) FROM albums WHERE artist_id = $1;

-- name: DeleteAlbumIfEmpty :one
-- M7 #372: deletes the album row only when it has no remaining tracks.
-- Used after a track delete to tidy up orphaned albums. RETURNING gives
-- us the artist_id so the service can chain into the artist-empty check.
-- Returns no rows when the album still has tracks; the service treats
-- pgx.ErrNoRows as "album not orphaned, skip cascade".
DELETE FROM albums a
WHERE a.id = $1
  AND NOT EXISTS (SELECT 1 FROM tracks t WHERE t.album_id = a.id)
RETURNING a.id, a.artist_id;

-- name: SetAlbumMbidIfNull :exec
-- M7 #379: heal MBID on existing album rows during rescan. Idempotent —
-- only updates when the existing mbid is NULL.
UPDATE albums
   SET mbid = $2,
       updated_at = now()
 WHERE id = $1 AND mbid IS NULL;
