class CreateLocales < ActiveRecord::Migration[8.0]
  def up
    create_table :locales, id: { type: :string, limit: 32 }, primary_key: :code do |t|
      t.string :language_code, limit: 16, null: false, index: true
      t.column :script_code, 'CHAR(4)', null: false
      t.integer :region_code, limit: 2, null: false
      t.string :variants, limit: 255, null: false, default: ''
      t.string :name, null: false
      t.datetime :deprecated_at, index: true
      t.datetime :created_at, null: false

      t.foreign_key :languages, column: :language_code, primary_key: :code
      t.foreign_key :scripts, column: :script_code, primary_key: :code
      t.foreign_key :regions, column: :region_code, primary_key: :code
      t.check_constraint ('REGEXP_LIKE(variants, ' +
                          "'^(" +
                          '(([a-z0-9]{5,8}|[0-9][a-z0-9]{3})' +
                          '(-([a-z0-9]{5,8}|[0-9][a-z0-9]{3}))*' +
                          '(-x(-[a-z0-9]{1,8})+)?)' +
                          '|(x(-[a-z0-9]{1,8})+)' +
                          ")?$', 'c')"),
                         name: 'locales_variants_check'

      t.index [:language_code, :script_code, :region_code, :variants], unique: true
    end

    execute <<~SQL
      INSERT INTO
        locales(code, language_code, script_code, region_code, name, created_at)
      VALUES
        ('ja', 'ja', 'Jpan', 392, '日本語', #{ connection.quote Time.current })
    SQL
  end

  def down
    drop_table :locales
  end
end