class CreateUsers < ActiveRecord::Migration[8.1]
  def change
    create_table :users do |t|
      t.string :email, null: false
      t.string :username, null: false
      t.string :password_digest, null: false
      t.text :bio
      t.boolean :profile_public, default: false, null: false

      t.timestamps
    end
    add_index :users, :email, unique: true
    add_index :users, :username, unique: true

    # Enable Row Level Security
    enable_rls_on :users
  end

  private

  def enable_rls_on(table_name)
    execute <<-SQL
      ALTER TABLE #{table_name} ENABLE ROW LEVEL SECURITY;

      CREATE POLICY #{table_name}_isolation_policy ON #{table_name}
        USING (id = current_setting('app.current_user_id', true)::bigint);
    SQL
  end
end