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

/**
 * Re-uploads as releases of their own (REBUILD.md, decision d): releases
 * keep the identity key their files gave (identity_key; release_key is that
 * for the first upload, then key:2, key:3, …), the group that owns their
 * articles, and their posting window (posted_at … last_posted_at). A batch's
 * chunk joins a release with its key and group whose window is within
 * UPLOAD_GAP_MS, else starts one.
 */
export default class extends BaseSchema {
  async up() {
    this.schema.raw(`ALTER TABLE releases ADD COLUMN IF NOT EXISTS identity_key varchar(40)`)
    this.schema.raw(`ALTER TABLE releases ADD COLUMN IF NOT EXISTS group_id integer`)
    this.schema.raw(`ALTER TABLE releases ADD COLUMN IF NOT EXISTS last_posted_at timestamptz`)
    this.schema.raw(`UPDATE releases SET identity_key = release_key, last_posted_at = posted_at WHERE identity_key IS NULL`)
    this.schema.raw(`ALTER TABLE releases ALTER COLUMN identity_key SET NOT NULL`)
    this.schema.raw(`ALTER TABLE releases ALTER COLUMN release_key TYPE varchar(48)`)
    this.schema.raw(`CREATE INDEX IF NOT EXISTS releases_identity_idx ON releases (identity_key, group_id)`)
  }

  async down() {
    this.schema.raw(`DROP INDEX IF EXISTS releases_identity_idx`)
    this.schema.raw(`ALTER TABLE releases DROP COLUMN IF EXISTS identity_key, DROP COLUMN IF EXISTS group_id, DROP COLUMN IF EXISTS last_posted_at`)
  }
}