require 'open3'

module Sunzi
  class Cli < Thor
    include Thor::Actions

    desc "create", "Create sunzi project"
    def create(project = 'sunzi')
      do_create(project)
    end

    desc "deploy example.com (or user@example.com:2222)", "Deploy sunzi project"
    def deploy(target)
      do_deploy(target)
    end

    desc "compile", "Compile sunzi project"
    def compile
      do_compile
    end

    desc "setup [linode|ec2]", "Setup a new VM"
    def setup(target)
      Cloud::Base.choose(self, target).setup
    end

    desc "teardown [linode|ec2] [name]", "Teardown an existing VM"
    def teardown(target, name)
      Cloud::Base.choose(self, target).teardown(name)
    end

    no_tasks do
      include Sunzi::Utility

      def self.source_root
        File.expand_path('../../',__FILE__)
      end

      def do_create(project)
        empty_directory project
        empty_directory "#{project}/remote"
        empty_directory "#{project}/remote/recipes"
        template "templates/create/sunzi.yml",                 "#{project}/sunzi.yml"
        template "templates/create/remote/install.sh",         "#{project}/remote/install.sh"
        template "templates/create/remote/recipes/ssh_key.sh", "#{project}/remote/recipes/ssh_key.sh"
      end

      def do_deploy(target)
        user, host, port = parse_target(target)
        endpoint = "#{user}@#{host}"

        # compile attributes and recipes
        compile

        # The host key might change when we instantiate a new VM, so
        # we remove (-R) the old host key from known_hosts.
        `ssh-keygen -R #{host} 2> /dev/null`

        commands = <<-EOS
        cd remote
        tar cz . | ssh -o 'StrictHostKeyChecking no' #{endpoint} -p #{port} '
        rm -rf ~/sunzi &&
        mkdir ~/sunzi &&
        cd ~/sunzi &&
        tar xz &&
        bash install.sh'
        EOS

        Open3.popen3(commands) do |stdin, stdout, stderr|
          stdin.close
          t = Thread.new(stderr) do |terr|
            while (line = terr.gets)
              print shell.set_color(line, :red, true)
            end
          end
          while (line = stdout.gets)
            print print shell.set_color(line, :green, true)
          end
          t.join
        end
      end

      def do_compile
        # Check if you're in the sunzi directory
        unless File.exists?('sunzi.yml')
          abort_with "You must be in the sunzi folder"
        end

        # Load sunzi.yml
        hash = YAML.load(File.read('sunzi.yml'))
        empty_directory 'remote/attributes'
        empty_directory 'remote/recipes'

        # Compile attributes.yml
        hash['attributes'].each do |key, value|
          File.open("remote/attributes/#{key}", 'w'){|file| file.write(value) }
        end
        # Compile recipes.yml
        hash['recipes'].each do |key, value|
          get value, "remote/recipes/#{key}.sh"
        end
      end

      def parse_target(target)
        target.match(/(.*@)?(.*?)(:.*)?$/)
        [ ($1 && $1.delete('@') || 'root'), $2, ($3 && $3.delete(':') || '22') ]
      end
    end
  end
end