# Mentorenwahl: A fullstack application for assigning mentors to students based on their whishes.
# Copyright (C) 2022  Dominic Grimm

# 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 3 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, see <https://www.gnu.org/licenses/>.

module Backend
  extend self

  # Runs backend services
  def run : Nil
    {% if flag?(:development) %}
      Log.warn { "Backend is running in development mode! Do not use this in production!" }
    {% end %}
    Log.info { "Starting services..." }

    channel = Channel(Nil).new(SERVICES.size)

    SERVICES.each do |service|
      spawn do
        service.call
        channel.send(nil)
      end
    end

    SERVICES.size.times do
      channel.receive
    end
    Fiber.yield
    Log.info { "Backend services started." }
  end
end