-- The admin Overview's status sections (M504): who is listening, what is
-- downloading, what the library holds. Each is one cheap read.

-- name: ListListeningNow :many
-- Plays in progress: open play events still inside their track's length,
-- with a few minutes' grace for a pause. A client that never says a play
-- ended would otherwise read as listening until the 24-hour sweep closes it.
SELECT pe.started_at, pe.client_id, pe.device_class,
       u.username,
       t.id AS track_id, t.title AS track_title, t.duration_ms,
       ar.name AS artist_name,
       al.id AS album_id, al.title AS album_title
  FROM play_events pe
  JOIN users u    ON u.id = pe.user_id
  JOIN tracks t   ON t.id = pe.track_id
  JOIN albums al  ON al.id = t.album_id
  JOIN artists ar ON ar.id = t.artist_id
 WHERE pe.ended_at IS NULL
   AND pe.started_at > now() - INTERVAL '24 hours'
   AND pe.started_at + make_interval(secs => t.duration_ms / 1000.0) + INTERVAL '5 minutes' > now()
 ORDER BY pe.started_at DESC
 LIMIT 20;

-- name: PlaysLastDay :one
-- The last day's listening, for the line under Listening now.
SELECT COUNT(*)::bigint                AS plays,
       COUNT(DISTINCT user_id)::bigint AS listeners,
       MAX(started_at)::timestamptz    AS last_at
  FROM play_events
 WHERE started_at > now() - INTERVAL '24 hours';

-- name: DownloadsStatus :one
-- Downloads at a glance: running, waiting on a person (and since when), and
-- the last day's imports and give-ups.
SELECT COUNT(*) FILTER (WHERE ended_at IS NULL AND import_state IN ('', 'downloading', 'waiting', 'importing'))::bigint AS running,
       COUNT(*) FILTER (WHERE ended_at IS NULL AND import_state IN ('review', 'failed'))::bigint AS needs_you,
       MIN(COALESCE(import_updated_at, grabbed_at)) FILTER (WHERE ended_at IS NULL AND import_state IN ('review', 'failed'))::timestamptz AS needs_you_since,
       COUNT(*) FILTER (WHERE imported_at > now() - INTERVAL '24 hours')::bigint AS imported_day,
       COUNT(*) FILTER (WHERE ended_at > now() - INTERVAL '24 hours'
                          AND end_reason IN ('stalled', 'failed', 'gone', 'abandoned'))::bigint AS given_up_day
  FROM grabs
 WHERE ended_at IS NULL
    OR ended_at > now() - INTERVAL '24 hours'
    OR imported_at > now() - INTERVAL '24 hours';

-- name: LibraryStatus :one
-- What the library holds on disk: tracks whose files are present, the
-- albums and artists they make, and their size.
SELECT COUNT(*)::bigint                   AS tracks,
       COUNT(DISTINCT album_id)::bigint   AS albums,
       COUNT(DISTINCT artist_id)::bigint  AS artists,
       COALESCE(SUM(file_size), 0)::bigint AS bytes
  FROM tracks
 WHERE missing_since IS NULL;