// Reply, forward attribution, and (multiple) pinned messages.

/** @param {import('node-pg-migrate').MigrationBuilder} pgm */
exports.up = (pgm) => {
  pgm.addColumns('messages', {
    // Reply target; if the replied message is hard-deleted the link clears.
    reply_to_id: { type: 'uuid', references: 'messages', onDelete: 'SET NULL' },
    // Whether this message is a forward, and a snapshot of the original author
    // (PublicUser jsonb) — null when the forwarder chose to hide the origin.
    forwarded: { type: 'boolean', notNull: true, default: false },
    forwarded_from: { type: 'jsonb' },
  });
  pgm.createIndex('messages', 'reply_to_id');

  // Pinned messages (multiple per conversation), newest pin first.
  pgm.createTable('message_pins', {
    conversation_id: {
      type: 'uuid',
      notNull: true,
      references: 'conversations',
      onDelete: 'CASCADE',
    },
    message_id: { type: 'uuid', notNull: true, references: 'messages', onDelete: 'CASCADE' },
    pinned_by: { type: 'uuid', notNull: true, references: 'users', onDelete: 'CASCADE' },
    pinned_at: { type: 'timestamptz', notNull: true, default: pgm.func('now()') },
  });
  pgm.addConstraint('message_pins', 'message_pins_pkey', {
    primaryKey: ['conversation_id', 'message_id'],
  });
  pgm.createIndex('message_pins', ['conversation_id', 'pinned_at']);
};

/** @param {import('node-pg-migrate').MigrationBuilder} pgm */
exports.down = (pgm) => {
  pgm.dropTable('message_pins');
  pgm.dropColumns('messages', ['reply_to_id', 'forwarded', 'forwarded_from']);
};