Sequel.migration do
  up do
    create_table(:account_statuses) do
      Integer :id, primary_key: true
      String :name, null: false, unique: true
    end

    from(:account_statuses).import(
      [:id, :name],
      [
        [1, "Unverified"],
        [2, "Verified"],
        [3, "Closed"]
      ]
    )

    db = self

    create_table(:accounts) do
      primary_key :id, type: :Bignum

      foreign_key :status_id, :account_statuses,
        null: false,
        default: 1

      String :email, null: false

      if db.supports_partial_indexes?
        index :email, unique: true, where: { status_id: [1, 2] }
      else
        index :email, unique: true
      end
    end

    create_table(:account_password_hashes) do
      foreign_key :id, :accounts,
        primary_key: true,
        type: :Bignum,
        on_delete: :cascade

      String :password_hash, null: false
    end

    create_table(:account_verification_keys) do
      foreign_key :id, :accounts,
        primary_key: true,
        type: :Bignum,
        on_delete: :cascade

      String :key, null: false

      DateTime :requested_at,
        null: false,
        default: Sequel::CURRENT_TIMESTAMP

      DateTime :email_last_sent,
        null: false,
        default: Sequel::CURRENT_TIMESTAMP
    end
  end

  down do
    drop_table(
      :account_verification_keys,
      :account_password_hashes,
      :accounts,
      :account_statuses
    )
  end
end