module Adminix
  module Helpers
    class Systemctl
      TMP_SCRIPT_PATH = '/tmp/write_systemctl_script.sh'.freeze

      def initialize(opts = {})
        @adminix_bin = opts[:adminix_bin] || Helpers::Command.which('adminix')
        @user = opts[:user] || Helpers::Command.whoami
        @group = opts[:group] || Helpers::Command.whoami
        @working_dir = opts[:working_dir] || Helpers::Command.home
        @systemctl_path = Adminix.config.systemctl[:watcher_service_path]
      end

      def write
        Helpers::Files.rm(TMP_SCRIPT_PATH)
        Helpers::Files.write_plain_file(TMP_SCRIPT_PATH, to_s)
        Helpers::Output.display_multiline_message([
          "sudo sh #{TMP_SCRIPT_PATH}",
          '# Run this command to configure your shell:',
          '# eval $(adminix write_systemctl)'
        ])
      end

      def to_s
        "#!/bin/bash\n" \
        "touch #{@systemctl_path}\n" \
        "cat << EOT > #{@systemctl_path}\n" \
        "[Unit]\n" \
        "Description=Adminix\n" \
        "Requires=network.target\n\n" \
        "[Service]\n" \
        "Type=simple\n" \
        "User=#{@user}\n" \
        "Group=#{@group}\n" \
        "WorkingDirectory=#{@working_dir}\n" \
        "ExecStart=#{@adminix_bin} watch\n" \
        "Restart=always\n" \
        "RestartSec=5\n" \
        "StandardInput=null\n" \
        "StandardOutput=syslog\n" \
        "StandardError=syslog\n" \
        "SyslogIdentifier=%n\n" \
        "KillMode=mixed\n" \
        "TimeoutStopSec=5\n" \
        "TimeoutSec=300\n\n" \
        "[Install]\n" \
        "WantedBy=multi-user.target\n" \
        "EOT\n" \
        "# Run this command to configure your shell:\n" \
        '# eval $(adminix write_systemctl)'
      end
    end
  end
end