-- +goose Up
CREATE TABLE metadata_lookup_cache (
  cache_key text PRIMARY KEY,
  payload bytea NOT NULL,
  expires_at timestamptz NOT NULL
);
CREATE INDEX metadata_lookup_cache_expiry ON metadata_lookup_cache(expires_at);
CREATE TABLE upload_release_groups (
  id uuid PRIMARY KEY,
  batch_id uuid NOT NULL REFERENCES upload_batches(id) ON DELETE CASCADE,
  grouping_key text NOT NULL,
  artist text NOT NULL DEFAULT '',
  album text NOT NULL DEFAULT '',
  cover_path text,
  UNIQUE(batch_id,grouping_key)
);
ALTER TABLE upload_files ADD COLUMN release_group_id uuid REFERENCES upload_release_groups(id) ON DELETE SET NULL;
CREATE INDEX upload_files_release_group ON upload_files(release_group_id);
CREATE TABLE upload_release_jobs (
  batch_id uuid NOT NULL REFERENCES upload_batches(id) ON DELETE CASCADE,
  group_key text NOT NULL DEFAULT '',
  state text NOT NULL DEFAULT 'queued' CHECK (state IN ('queued','searching','ready','not_found','needs_input','error')),
  request jsonb NOT NULL DEFAULT '{}',
  input_hash text NOT NULL DEFAULT '',
  candidates jsonb NOT NULL DEFAULT '[]',
  audio_results jsonb NOT NULL DEFAULT '[]',
  selected_release uuid,
  lease uuid,
  attempts int NOT NULL DEFAULT 0,
  updated_at timestamptz NOT NULL DEFAULT now(),
  PRIMARY KEY(batch_id,group_key)
);
-- +goose StatementBegin
CREATE FUNCTION queue_upload_release_lookup() RETURNS trigger LANGUAGE plpgsql AS $$
BEGIN
  IF NEW.status IN ('pending_review','import_failed','withdrawn') AND
     (OLD.status IS DISTINCT FROM NEW.status OR OLD.metadata IS DISTINCT FROM NEW.metadata OR
      OLD.tags IS DISTINCT FROM NEW.tags OR OLD.duration_ms IS DISTINCT FROM NEW.duration_ms) THEN
    INSERT INTO upload_release_jobs(batch_id,group_key) VALUES (NEW.batch_id,coalesce(NEW.release_group_id::text,''))
    ON CONFLICT (batch_id,group_key) DO UPDATE SET state='queued', request='{}', audio_results='[]', lease=NULL, attempts=0,
      selected_release=NULL, updated_at=now();
  END IF;
  RETURN NEW;
END;
$$;
-- +goose StatementEnd
CREATE TRIGGER upload_release_lookup_changed AFTER UPDATE OF status, metadata, tags, duration_ms ON upload_files
  FOR EACH ROW EXECUTE FUNCTION queue_upload_release_lookup();
INSERT INTO upload_release_jobs(batch_id)
  SELECT DISTINCT batch_id FROM upload_files WHERE status IN ('pending_review','import_failed');

-- +goose Down
DROP TRIGGER upload_release_lookup_changed ON upload_files;
DROP FUNCTION queue_upload_release_lookup();
DROP TABLE upload_release_jobs;
ALTER TABLE upload_files DROP COLUMN release_group_id;
DROP TABLE upload_release_groups;
DROP TABLE metadata_lookup_cache;