-- name: CreateQueue :one
INSERT INTO queue DEFAULT VALUES
RETURNING *;

-- name: GetQueue :one
SELECT *
FROM queue
WHERE uuid = $1;

-- name: EndQueue :exec
UPDATE queue SET ended_at = NOW()
WHERE uuid = $1 AND ended_at IS NULL;

-- name: EndActiveQueues :exec
UPDATE queue SET ended_at = NOW()
WHERE ended_at IS NULL;

-- name: SetQueueLastFetched :exec
UPDATE queue SET last_fetched_song_uuid = $2
WHERE uuid = $1;

-- name: SetQueueCurrentSong :exec
UPDATE queue SET current_song = $2
WHERE uuid = $1;

-- name: AddLastFetchedToQueue :exec
-- Appends the queue's last fetched song and makes it the current song.
-- Does nothing when no song has been fetched since the last call.
WITH added AS (
    INSERT INTO queue_song (queue_uuid, song_no, song_uuid, soundtrack_name, song_name)
    SELECT q.uuid,
           (SELECT COALESCE(MAX(qs.song_no), -1) + 1 FROM queue_song qs WHERE qs.queue_uuid = q.uuid),
           s.uuid, st.soundtrack_name, s.song_name
    FROM queue q
    JOIN song s ON s.uuid = q.last_fetched_song_uuid
    JOIN soundtrack st ON st.id = s.soundtrack_id
    WHERE q.uuid = $1
    RETURNING queue_uuid, song_no
)
UPDATE queue SET current_song = added.song_no, last_fetched_song_uuid = NULL
FROM added
WHERE queue.uuid = added.queue_uuid;

-- name: ListQueueSongs :many
-- The song columns are NULL when the song has been removed from the library since.
SELECT qs.song_no, qs.song_uuid, qs.soundtrack_name, qs.song_name,
       s.path, s.times_played, s.soundtrack_uuid
FROM queue_song qs
LEFT JOIN song s ON s.uuid = qs.song_uuid
WHERE qs.queue_uuid = $1
ORDER BY qs.song_no;