#!/usr/bin/env ruby
# frozen_string_literal: true

#
# Copyright (c) [2022] SUSE LLC
#
# All Rights Reserved.
#
# This program is free software; you can redistribute it and/or modify it
# under the terms of version 2 of the GNU General Public License as published
# by the Free Software Foundation.
#
# 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, contact SUSE LLC.
#
# To contact SUSE LLC about this file by physical or electronic mail, you may
# find current contact information at www.suse.com.

# TEMPORARY overwrite of Y2DIR to use DBus for communication with dependent yast modules
$LOAD_PATH.unshift File.expand_path("../lib", __dir__)

# Set the PATH to a known value
ENV["PATH"] = "/sbin:/usr/sbin:/usr/bin:/bin"

require "rubygems"
# find Gemfile when D-Bus activates a git checkout
Dir.chdir(__dir__) do
  require "bundler/setup"
end
require "dinstaller/dbus/service_runner"

# Set up a {Logger} suitable either for terminal (started manually)
# or syslog (D-Bus activated)
# @return [Logger]
def logger_for(name)
  if $stdout.tty?
    formatter = Logger::Formatter.new # the default
  else
    # going via syslog which will provide time and progname already
    formatter = ->(severity, _time, _progname, msg) { "#{severity}: #{msg}\n" }
    $stdout.sync = true
  end

  Logger.new($stdout, progname: name.to_s, formatter: formatter)
end

# Runs the service with the given name
#
# @param name [Symbol] Service name
# @see ORDERED_SERVICES
def start_service(name)
  general_y2dir = File.expand_path("../lib/dinstaller/dbus/y2dir", __dir__)
  module_y2dir = File.expand_path("../lib/dinstaller/dbus/y2dir/#{name}", __dir__)
  ENV["Y2DIR"] = [ENV["Y2DIR"], module_y2dir, general_y2dir].compact.join(":")

  service_runner = DInstaller::DBus::ServiceRunner.new(name, logger: logger_for(name))
  service_runner.run
end

ORDERED_SERVICES = [:questions, :language, :software, :storage, :users, :manager].freeze

# Normally the services are started by D-Bus activation.
# This starts all the services sequentially without relying on that.
# This is useful during development to have their log output on the terminal,
# not mixed with other syslog/journal messages.
# The downside is relying on an arbitrary delay, and a manually maintained ordering.
#
# @return [void]
# @see ORDERED_SERVICES
def start_all_services
  ORDERED_SERVICES.map do |name|
    puts "Starting #{name}:"
    fork { exec("#{__FILE__} #{name}") }
    sleep(7)
  end
end

if ARGV.empty?
  start_all_services
  Signal.trap("SIGINT") do
    puts "Stopping all services..."
    exit
  end
  Process.wait
elsif ["-h", "--help"].include?(ARGV[0])
  me = $PROGRAM_NAME
  puts "Usage:"
  puts "#{me} -h|--help"
  puts "#{me} -s|--status"
  puts "#{me} -k|--kill"
  puts "#{me} #{ORDERED_SERVICES.sort.join("|")}"
elsif ["-s", "--status"].include?(ARGV[0])
  # The .[a-z] ensures matching the forked processes
  # which can be distinguished by having a non-option argument
  system "pgrep -fl bin/d-installer.[a-z]"
  # busctl is prettier but will find nothing until the service files are installed,
  # hence the pgrep above
  system "busctl | grep -E '^NAME|DInstaller'"
elsif ["-k", "--kill"].include?(ARGV[0])
  system "pkill -f bin/d-installer.[a-z]"
else
  name = ARGV[0]
  Signal.trap("SIGINT") do
    puts "Stopping #{name} service..."
    exit
  end
  start_service(name.to_sym)
end