import { QueryInterface } from 'sequelize';

module.exports = {
  up: async (queryInterface: QueryInterface) => {
    // Speeds latest-submission window ordering per dealer+FY+quarter.
    await queryInterface.sequelize.query(`
      CREATE INDEX IF NOT EXISTS idx_form16a_submissions_dashboard_latest
      ON form16a_submissions (
        dealer_code,
        financial_year,
        quarter,
        version DESC,
        submitted_date DESC,
        created_at DESC,
        id DESC
      );
    `);

    // Speeds join between latest submissions and 26AS quarter snapshots.
    await queryInterface.sequelize.query(`
      CREATE INDEX IF NOT EXISTS idx_form16a_submissions_tan_fy_quarter
      ON form16a_submissions (tan_number, financial_year, quarter);
    `);

    // Speeds normalized active dealer lookup used by dashboard aggregation.
    await queryInterface.sequelize.query(`
      CREATE INDEX IF NOT EXISTS idx_dealers_active_normalized_code_region
      ON dealers (
        (TRIM(COALESCE(NULLIF(sales_code, ''), NULLIF(dlrcode, '')))),
        region
      )
      WHERE is_active = true;
    `);
  },

  down: async (queryInterface: QueryInterface) => {
    await queryInterface.sequelize.query(`
      DROP INDEX IF EXISTS idx_dealers_active_normalized_code_region;
    `);

    await queryInterface.sequelize.query(`
      DROP INDEX IF EXISTS idx_form16a_submissions_tan_fy_quarter;
    `);

    await queryInterface.sequelize.query(`
      DROP INDEX IF EXISTS idx_form16a_submissions_dashboard_latest;
    `);
  },
};