#-- copyright
# OpenProject is an open source project management software.
# Copyright (C) the OpenProject GmbH
#
# This program is free software; you can redistribute it and/or
# modify it under the terms of the GNU General Public License version 3.
#
# OpenProject is a fork of ChiliProject, which is a fork of Redmine. The copyright follows:
# Copyright (C) 2006-2013 Jean-Philippe Lang
# Copyright (C) 2010-2013 the ChiliProject Team
#
# This program is free software; you can redistribute it and/or
# modify it under the terms of the GNU General Public License
# as published by the Free Software Foundation; either version 2
# of the License, or (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
#
# See COPYRIGHT and LICENSE files for more details.
#++

module OpenProject
  module PostgresEnvironment
    ##
    # Maps the PG env variable name to the key in the AR connection config.
    PG_ENV_TO_CONNECTION_CONFIG = {
      PGHOST: :host,
      PGPORT: :port,
      PGUSER: %i[username user],
      PGPASSWORD: :password,
      PGDATABASE: :database
    }.freeze

    module_function

    def pg_env
      database_config = ActiveRecord::Base.connection_db_config.configuration_hash

      PG_ENV_TO_CONNECTION_CONFIG.filter_map do |key, config_key|
        possible_keys = Array(config_key)
        value = possible_keys
          .lazy
          .filter_map { |key| database_config[key] }
          .first

        [key.to_s, value.to_s] if value.present?
      end.to_h
    end
  end
end