require 'optparse'

module VagrantPlugins
  module CommandSnapshot
    module Command
      class Root < Vagrant.plugin("2", :command)
        def self.synopsis
          "manages snapshots: saving, restoring, etc."
        end

        def initialize(argv, env)
          super

          @main_args, @sub_command, @sub_args = split_main_and_subcommand(argv)

          @subcommands = Vagrant::Registry.new
          @subcommands.register(:save) do
            require_relative "save"
            Save
          end

          @subcommands.register(:restore) do
            require_relative "restore"
            Restore
          end

          @subcommands.register(:delete) do
            require_relative "delete"
            Delete
          end

          @subcommands.register(:list) do
            require_relative "list"
            List
          end

          @subcommands.register(:push) do
            require_relative "push"
            Push
          end

          @subcommands.register(:pop) do
            require_relative "pop"
            Pop
          end
        end

        def execute
          if @main_args.include?("-h") || @main_args.include?("--help")
            # Print the help for all the commands.
            @env.ui.info(help, prefix: false)
            return 0
          end

          # If we reached this far then we must have a subcommand. If not,
          # then we also just print the help and exit.
          command_class = @subcommands.get(@sub_command.to_sym) if @sub_command
          if !command_class || !@sub_command
            raise Vagrant::Errors::CLIInvalidUsage,
              help: help()
          end
          @logger.debug("Invoking command class: #{command_class} #{@sub_args.inspect}")

          # Initialize and execute the command class
          command_class.new(@sub_args, @env).execute
        end

        # Prints the help out for this command
        def help
          opts = OptionParser.new do |opts|
            opts.banner = "Usage: vagrant snapshot <subcommand> [<args>]"
            opts.separator ""
            opts.separator "Available subcommands:"

            # Add the available subcommands as separators in order to print them
            # out as well.
            keys = []
            @subcommands.each { |key, value| keys << key.to_s }

            keys.sort.each do |key|
              opts.separator "     #{key}"
            end

            opts.separator ""
            opts.separator "For help on any individual subcommand run `vagrant snapshot <subcommand> -h`"
          end

          opts.help
        end
      end
    end
  end
end