import { BaseSchema } from '@adonisjs/lucid/schema'

/**
 * Indexes that match the newest-first sort (SearchService: posted_at DESC
 * NULLS LAST, id DESC). The old ones (posted_at DESC: nulls first) didn't,
 * so the default page sorted all 68M releases: 23 s. Built concurrently, the
 * old ones dropped after.
 */
export default class extends BaseSchema {
  static disableTransactions = true

  async up() {
    this.schema.raw(`CREATE INDEX CONCURRENTLY IF NOT EXISTS releases_newest_idx ON releases (posted_at DESC NULLS LAST, id DESC)`)
    this.schema.raw(`CREATE INDEX CONCURRENTLY IF NOT EXISTS releases_category_newest_idx ON releases (category, posted_at DESC NULLS LAST, id DESC)`)
    this.schema.raw(`DROP INDEX CONCURRENTLY IF EXISTS releases_posted_at_idx`)
    this.schema.raw(`DROP INDEX CONCURRENTLY IF EXISTS releases_category_posted_idx`)
  }

  async down() {
    this.schema.raw(`CREATE INDEX CONCURRENTLY IF NOT EXISTS releases_posted_at_idx ON releases (posted_at DESC)`)
    this.schema.raw(`CREATE INDEX CONCURRENTLY IF NOT EXISTS releases_category_posted_idx ON releases (category, posted_at DESC)`)
    this.schema.raw(`DROP INDEX CONCURRENTLY IF EXISTS releases_newest_idx`)
    this.schema.raw(`DROP INDEX CONCURRENTLY IF EXISTS releases_category_newest_idx`)
  }
}