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

/**
 * is_readable_name(): also hex with a Unix time, UUIDs, digit-only names
 * (and rclone's "83111763 n"), lowercase base32/36 tokens and short tokens
 * with capitals all over. The same rules as looksRandom() in ArchiveService.
 */
export default class extends BaseSchema {
  async up() {
    this.defer(async (db) => {
      await db.rawQuery(`
        CREATE OR REPLACE FUNCTION is_readable_name(name text) RETURNS boolean IMMUTABLE LANGUAGE sql AS $$
          WITH s AS (SELECT regexp_replace(name_stem(name), '\\.[A-Za-z0-9]{1,4}$', '') AS stem)
          SELECT name IS NOT NULL AND NOT (
            (stem ~ '^[A-Za-z0-9]{16,}$' AND stem ~ '[a-z]' AND stem ~ '[A-Z]'
              AND (stem ~ '\\d' OR length(regexp_replace(stem, '[^A-Z]', '', 'g')) >= 6))
            OR stem ~* '^[0-9a-f]{16,}$'
            OR stem ~* '^[0-9a-f]{16,}\\.\\d{9,}$'
            OR stem ~* '^[0-9a-f]{8}-[0-9a-f]{4}-[0-9a-f]{4}-[0-9a-f]{4}-[0-9a-f]{12}$'
            OR stem ~ '^\\d{6,}( n){0,1}$'
            OR (stem ~ '^[a-z0-9]{12,}$' AND length(regexp_replace(stem, '\\D', '', 'g')) >= 2
                AND length(regexp_replace(stem, '[^a-z]', '', 'g')) >= 4)
            OR (stem ~ '^[A-Za-z0-9]{8,15}$' AND stem ~ '\\d' AND stem ~ '[a-z]'
                AND length(regexp_replace(substr(stem, 2), '[^A-Z]', '', 'g')) >= 3))
          FROM s
        $$`)
    })
  }

  async down() {
    this.defer(async (db) => {
      await db.rawQuery(`
        CREATE OR REPLACE FUNCTION is_readable_name(name text) RETURNS boolean IMMUTABLE LANGUAGE sql AS $$
          WITH s AS (SELECT regexp_replace(name_stem(name), '\\.[A-Za-z0-9]{1,4}$', '') AS stem)
          SELECT name IS NOT NULL AND NOT (
            (stem ~ '^[A-Za-z0-9]{16,}$' AND stem ~ '[a-z]' AND stem ~ '[A-Z]'
              AND (stem ~ '\\d' OR length(regexp_replace(stem, '[^A-Z]', '', 'g')) >= 6))
            OR stem ~* '^[0-9a-f]{16,}$')
          FROM s
        $$`)
    })
  }
}