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

/**
 * Par2-based grouping of obfuscated posts (CONCEPT.md D16): the par2 file
 * list of a release, and the exact file size of body-derived binaries to
 * match against it.
 */
export default class extends BaseSchema {
  async up() {
    this.schema.alterTable('binaries', (table) => {
      // Exact file size from =ybegin; only known for body-derived binaries.
      table.bigInteger('size').index()
    })
    this.schema.alterTable('releases', (table) => {
      // How the release was recognised: subject, stem, weak-stem or par2.
      table.string('source', 16)
    })
    this.schema.createTable('release_files', (table) => {
      table.bigInteger('release_id').notNullable().references('releases.id').onDelete('CASCADE')
      table.string('par2_file_id', 32).notNullable()
      table.text('name').notNullable()
      table.bigInteger('size').notNullable().index()
      table.string('md5_16k', 32).notNullable()
      table.primary(['release_id', 'par2_file_id'])
    })
  }

  async down() {
    this.schema.dropTable('release_files')
    this.schema.alterTable('releases', (table) => table.dropColumn('source'))
    this.schema.alterTable('binaries', (table) => table.dropColumn('size'))
  }
}