-- Admin alert forms already store UTC clock values. Give these columns an
-- explicit timezone so imports, API serialization and midnight expiry agree
-- regardless of the PostgreSQL or Node.js host timezone. Safe to rerun.
DO $$
DECLARE col text;
BEGIN
  FOREACH col IN ARRAY ARRAY['start_time', 'end_time', 'created_at'] LOOP
    IF EXISTS (SELECT 1 FROM information_schema.columns
      WHERE table_schema = current_schema() AND table_name = 'alerts'
        AND column_name = col AND data_type = 'timestamp without time zone') THEN
      EXECUTE format('ALTER TABLE alerts ALTER COLUMN %I TYPE timestamptz USING %I AT TIME ZONE ''UTC''', col, col);
    END IF;
  END LOOP;
END $$;

ALTER TABLE alerts ADD COLUMN IF NOT EXISTS notification_pending BOOLEAN NOT NULL DEFAULT false;

CREATE TABLE IF NOT EXISTS telegram_import_messages (
  id SERIAL PRIMARY KEY,
  city_id INTEGER NOT NULL REFERENCES cities(id),
  channel_id TEXT NOT NULL,
  channel_username VARCHAR(32) NOT NULL,
  message_id INTEGER NOT NULL CHECK (message_id > 0),
  published_at TIMESTAMPTZ NOT NULL,
  edited_at TIMESTAMPTZ,
  content_hash CHAR(64) NOT NULL,
  raw_text TEXT NOT NULL,
  has_media BOOLEAN NOT NULL DEFAULT false,
  status VARCHAR(20) NOT NULL CHECK (status IN ('review', 'published', 'dismissed', 'expired')),
  reasons JSONB NOT NULL DEFAULT '[]',
  parsed JSONB NOT NULL DEFAULT '{}',
  reviewed_by INTEGER REFERENCES users(id) ON DELETE SET NULL,
  created_at TIMESTAMPTZ NOT NULL DEFAULT now(),
  updated_at TIMESTAMPTZ NOT NULL DEFAULT now(),
  UNIQUE (city_id, channel_id, message_id)
);

CREATE TABLE IF NOT EXISTS telegram_import_alerts (
  message_id INTEGER NOT NULL REFERENCES telegram_import_messages(id) ON DELETE CASCADE,
  route_id INTEGER NOT NULL REFERENCES routes(id) ON DELETE CASCADE,
  alert_id INTEGER UNIQUE REFERENCES alerts(id) ON DELETE SET NULL,
  PRIMARY KEY (message_id, route_id)
);

CREATE INDEX IF NOT EXISTS idx_telegram_import_review ON telegram_import_messages(city_id, status, published_at DESC);