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

/**
 * Names and groupings from file contents (CONCEPT.md D21): a fingerprint
 * (exact size + MD5 of the first 16 KiB, as par2 records it) and the real
 * filename recovered from par2.
 */
export default class extends BaseSchema {
  async up() {
    this.schema.alterTable('binaries', (table) => {
      table.string('md5_16k', 32).index()
      // Filename recovered from file contents (par2); `name` stays as posted.
      table.text('real_name')
    })
    this.schema.alterTable('files', (table) => {
      table.text('real_name')
    })
    for (const tableName of ['parts', 'part_conflicts']) {
      this.schema.alterTable(tableName, (table) => {
        // Only for part 1: MD5 of the first 16 KiB of the file.
        table.string('md5_16k', 32)
      })
    }
    this.schema.alterTable('release_files', (table) => {
      table.index(['md5_16k'])
    })
  }

  async down() {
    this.schema.alterTable('release_files', (table) => table.dropIndex(['md5_16k']))
    for (const tableName of ['parts', 'part_conflicts']) {
      this.schema.alterTable(tableName, (table) => table.dropColumn('md5_16k'))
    }
    this.schema.alterTable('files', (table) => table.dropColumn('real_name'))
    this.schema.alterTable('binaries', (table) => {
      table.dropColumn('real_name')
      table.dropColumn('md5_16k')
    })
  }
}