require 'fileutils'

module Pushover
  # This is an extended [Hash] that adds some saving features via yajl.
  class ConfigBlob < Hash
    attr_accessor :save_file

    # @return [String] the dirname of the save file.
    def save_dir
      File.dirname @save_file
    end

    def initialize(load = true)
      @save_file = "#{Dir.home}/.config/pushover/config.json"

      self.load if load
    end

    # Clear the config file (not implemented)
    def clear
    end

    # Save the config, will raise an exception if the file exists.
    def save
      FileUtils.mkdir_p save_dir if !Dir.exist? save_dir
      if any?
        # I do this the long way because I want an immediate sync.
        f = open(@save_file, 'w')
        f.write Yajl.dump self
        f.sync
        f.close
      end
    end

    # Backup our save file, will remove original in the process.
    def backupSave
      FileUtils.mv @save_file, "#{@save_file}.bak" if File.file? @save_file
    end

    # Save the config, removing the existing one if necessary.
    def save!(backup = true)
      if backup
        backupSave
      else
        FileUtils.rm @save_file if File.file? @save_file
      end

      save
    end

    # Load the config file if it is available.
    def load
      if File.exist?(@save_file) && File.stat(@save_file).size > 0
        h = Yajl.load open(@save_file, 'r').read
        h.each { |k,v| self[k.to_sym] = v}
      end
    end
  end

  # A convenience instance of config, provides Pushover.Config.
  Config = ConfigBlob.new
end