class AddNotificationSettings < ActiveRecord::Migration[6.1]
  def up
    create_table :notification_settings do |t|
      t.belongs_to :project, null: true, index: true, foreign_key: true
      t.belongs_to :user, null: false, index: true, foreign_key: true
      t.integer :channel, limit: 1
      t.boolean :watched, default: false
      t.boolean :involved, default: false
      t.boolean :mentioned, default: false
      t.boolean :all, default: false

      t.timestamps default: -> { 'CURRENT_TIMESTAMP' }

      t.index %i[user_id channel],
              unique: true,
              where: "project_id IS NULL",
              name: 'index_notification_settings_unique_project_null'

      t.index %i[user_id project_id channel],
              unique: true,
              where: "project_id IS NOT NULL",
              name: 'index_notification_settings_unique_project'
    end

    remove_column :members, :mail_notification
  end

  def down
    add_column :members, :mail_notification, :boolean, default: false, null: false
    add_column :users, :mail_notification, :string, default: '', null: false

    drop_table :notification_settings
  end
end