#!/usr/bin/env ruby

$: << File.expand_path('../../lib', __FILE__)

require 'Qt4'
require 'thread'
require 'atomic'
require 'thor'

require 'unison/profile'
require 'unison/config'
require 'unison/bridge'
require 'unison/filesystem_watcher'
require 'unison/ui/icon'
require 'unison/ui/menu'
require 'unison/ui/fileview'
require 'unison/ui/preferences'

require 'forwardable'

class UnisonWatcher < Qt::Application
  TRANSFER_LOG = '~/unison.log'
  SYNC_CHECK_COUNT = 600
  SYNC_CHECK_TIME = 0.1

  extend Forwardable

  def_delegators :@config, :profiles

  def initialize(profiles, *args)
    super(*args)

    @config = Unison::Config.ensure(File.expand_path('~/.unison/watch.yml'))
    @queue = Atomic.new([])

    @sync_now = false
    @exiting = false
    @active = true
  end

  def <<(dirs)
    @queue.update { |q| q += [ dirs ].flatten ; q }
  end

  def processed_profiles
    @processed_profiles ||= Unison::Profile.process(profiles)
  end

  def watch
    Unison::FilesystemWatcher.new(paths_to_watch, self)
  end

  def paths_to_watch
    processed_profiles.collect(&:paths_with_local_root).flatten
  end

  def fileview
    @fileview ||= Unison::UI::FileView.new(File.expand_path(TRANSFER_LOG))
  end

  def menu
    return @menu if @menu

    @menu = Unison::UI::Menu.new

    @menu.on(:sync_now) { @sync_now = true }
    @menu.on(:toggle_status) { toggle_status }
    @menu.on(:view_log) { fileview.show }
    @menu.on(:quit) { @exiting = true }
    @menu.on(:preferences) { preferences.show }
    @menu.generate

    @menu
  end

  def update_ui
    @icon.current_icon = @current_icon
    @menu.status_text = @current_text

    processEvents
  end

  def ui
    @icon = Unison::UI::Icon.new(menu, self, profiles, File.expand_path('../../assets', __FILE__))
    @config.on_update { @icon.profiles = @config.profiles }

    @current_icon = 'idle'

    toggle_status true
    @prior_text = nil

    @icons = {}

    @remote_sync_check = SYNC_CHECK_COUNT

    while !@exiting
      check

      update_ui

      sleep SYNC_CHECK_TIME
    end
  end

  def start
    if !@config.active_profiles?
      preferences.show
    end

    watch
    ui
  end

  def preferences
    @preferences ||= Unison::UI::Preferences.new(@config)
  end

  def show_working
    index = 0
    while !@done
      @current_icon = "working-#{index + 1}"
      fileview.read!

      update_ui

      break if @done

      sleep 0.25
      index = (index + 1) % 2
    end

    @current_icon = 'idle'
    fileview.read!
  end

  def check
    begin
      if @active && (@queue.value.length > 0 || @remote_sync_check == 0 || @sync_now)
        dir = nil

        @current_text = "Syncing..."

        @done = false

        Unison::Bridge.run(profiles, TRANSFER_LOG) { @done = true }

        show_working

        @remote_sync_check = SYNC_CHECK_COUNT
        @sync_now = false
        @queue.update { [] }
      end
    rescue => e
      puts e.message
      puts e.backtrace.join("\n")
      exit
    end

    @remote_sync_check -= 1

    if @active
      @current_text = "Next check in #{sprintf("%.0d", SYNC_CHECK_TIME * @remote_sync_check)} secs."
    else
      @current_text = "Syncing paused."

      @remote_sync_check = SYNC_CHECK_COUNT
    end
  end

  def toggle_status(set = nil)
    @active = set || !@active

    @menu.active_status_text = @active ? "Pause syncing" : "Resume syncing"
    @current_icon = @active ? 'idle' : 'paused'
  end
end

module Unison
  class CLI < Thor
    include Thor::Actions

    desc 'start profile <profile> ...', 'Run Unison Watch using the provided profiles'
    def start(*profiles)
      UnisonWatcher.new(profiles, ARGV).start
    end

    default_task :run

    def method_missing(*args)
      start(*args)
    end

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

    desc 'app-bundle', 'Make an app bundle in the current directory'
    def app_bundle
      destination_path = Dir.pwd

      directory 'UnisonWatch.app', 'UnisonWatch.app'
      Dir['UnisonWatch.app/**/*'].each do |file|
        if File.directory?(file)
          File.chmod(0755, file)
        end
      end

      File.chmod(0755, "UnisonWatch.app/Contents/MacOS/UnisonWatch")
    end

    no_tasks do
      def gem_directory
        File.expand_path('../..', __FILE__)
      end
    end
  end
end

Unison::CLI.start