-- Minstrel's own backup: its settings and its runs.

-- name: GetBackupSettings :one
SELECT * FROM backup_settings WHERE id = true;

-- name: SaveBackupSettings :exec
UPDATE backup_settings
   SET enabled     = $1,
       destination = $2,
       folder      = $3,
       endpoint    = $4,
       bucket      = $5,
       access_key  = $6,
       secret_key  = $7,
       run_hour    = $8,
       upload_limit_kib = $9,
       updated_at  = now()
 WHERE id = true;

-- name: StartBackupRun :one
INSERT INTO backup_runs (trigger) VALUES ($1)
RETURNING id, started_at;

-- name: FinishBackupRun :exec
UPDATE backup_runs
   SET status      = $2,
       finished_at = now(),
       location    = $3,
       bytes       = $4,
       error       = $5
 WHERE id = $1;

-- name: ListBackupRuns :many
SELECT id, trigger, status, started_at, finished_at, location, bytes, error
  FROM backup_runs
 ORDER BY started_at DESC
 LIMIT $1;

-- name: BackupRunTimes :one
-- The times the verdict turns on. A run that never happened is the epoch,
-- so the row always exists. failing_since is the first failure after the last
-- success, and the epoch when the latest finished run succeeded.
SELECT
    COALESCE((SELECT max(started_at) FROM backup_runs WHERE status = 'succeeded'),
             'epoch'::timestamptz)::timestamptz AS last_success,
    COALESCE((SELECT max(started_at) FROM backup_runs),
             'epoch'::timestamptz)::timestamptz AS last_attempt,
    COALESCE((SELECT min(started_at) FROM backup_runs
               WHERE status = 'failed'
                 AND started_at > COALESCE((SELECT max(started_at) FROM backup_runs WHERE status = 'succeeded'),
                                           'epoch'::timestamptz)),
             'epoch'::timestamptz)::timestamptz AS failing_since;

-- name: FailUnfinishedBackupRuns :execrows
UPDATE backup_runs
   SET status = 'failed', finished_at = now(),
       error = 'The server stopped while the backup was running.'
 WHERE status = 'running';

-- name: PruneBackupRuns :execrows
DELETE FROM backup_runs WHERE status <> 'running' AND started_at < $1;