class Riemann::Dash::Config
  attr_accessor :config_path
  attr_accessor :store

  def initialize
    self.store = {}
    setup_default_values
  end

  def self.instance
    @instance ||= Riemann::Dash::Config.new
  end

  def self.reset!
    @instance = nil
  end

  def setup_default_values
    store.merge!({
      :controllers => [File.join(File.dirname(__FILE__), 'controller')],
      :views       => File.join(File.dirname(__FILE__), 'views'),
      :ws_config   => File.expand_path(File.join(File.dirname(__FILE__), '..', '..', '..', 'config', 'config.json')),
      :public      => File.join(File.dirname(__FILE__), 'public')
    })
  end

  def ws_config_file
    store[:ws_config]
  end

  # backwards compatible forwarder to store-ivar
  def [](k)
    store[k]
  end

  def []=(k,v)
    store[k] = v
  end


  # Executes the configuration file.
  def load_config(path)
    self.config_path = path
    begin
      Riemann::Dash::App.instance_eval File.read(config_path)
      true
    rescue Errno::ENOENT
      false
    end
  end

  def load_controllers
    store[:controllers].each { |d| load_controllers_from(d) }
  end

  def setup_views
    Riemann::Dash::App.set :views, File.expand_path(store[:views])
  end

  def setup_public_dir
    require 'riemann/dash/rack/static'
    Riemann::Dash::App.use Riemann::Dash::Static, :root => store[:public]
  end

  # Load controllers.
  def load_controllers_from(dir)
    sorted_controller_list(dir).each do |r|
      require r
    end
  end

  # Controllers can be regular old one-file-per-class, but
  # if you prefer a little more modularity, this method will allow you to
  # define all controller methods in their own files.  For example, get
  # "/posts/*/edit" can live in controller/posts/_/edit.rb. The sorting
  # system provided here requires files in the correct order to handle
  # wildcards appropriately.
  def sorted_controller_list(dir)
    rbs = []
    Find.find(
      File.expand_path(dir)
    ) do |path|
      rbs << path if path =~ /\.rb$/
    end

    # Sort paths with _ last, becase those are wildcards.
    rbs.sort! do |a, b|
      as = a.split File::SEPARATOR
      bs = b.split File::SEPARATOR

      # Compare common subpaths
      l = [as.size, bs.size].min
      catch :x do
        (0...l).each do |i|
          a, b = as[i], bs[i]
          if a[/^_/] and not b[/^_/]
            throw :x, 1
          elsif b[/^_/] and not a[/^_/]
            throw :x, -1
          elsif ord = (a <=> b) and ord != 0
            throw :x, ord
          end
        end

        # All subpaths are identical; sort longest first
        if as.size > bs.size
          throw :x, -1
        elsif as.size < bs.size
          throw :x, -1
        else
          throw :x, 0
        end
      end
    end
  end


  require 'multi_json'
  require 'fileutils'


  def read_ws_config
    if File.exists? ws_config_file
      File.read(ws_config_file)
    else
      MultiJson.encode({})
    end
  end

  def update_ws_config(update)
    update = MultiJson.decode(update)

    # Read old config
    if File.exists? ws_config_file
      old = MultiJson.decode File.read(ws_config_file)
    else
      old = {}
    end

    new_config = {}

    # Server
    new_config['server'] = update['server'] or old['server']

    #p update['workspaces']
    new_config['workspaces'] = update['workspaces'] or old['workspaces']

    # Save new config
    FileUtils.mkdir_p File.dirname(ws_config_file)
    File.open(ws_config_file, 'w') do |f|
      f.write(MultiJson.encode(new_config, :pretty => true))
    end
  end
end