# thx dominikh for this code :) (then slightly modified)
module Cinch
  module Plugins
    class Manager
      include Cinch::Plugin

      match(/m list/, method: :list_plugins)
      match(/m load (\S+)/, method: :load_plugin)
      match(/m unload (\S+)/, method: :unload_plugin)
      match(/m reload (\S+)/, method: :reload_plugin)
      match(/m set (\S+) (\S+) (.+)$/, method: :set_option)

      def list_plugins(m)
        back = ''
        @bot.plugins.each { |p| back += "#{p.class.name.split('::').last.downcase} " }
        m.reply back
      end

      def load_plugin(m, mapping)
        plugin = mapping.downcase.camelize
        p plugin
        p mapping

        file_name = "#{ROOT_DIR}/plugins/#{mapping.downcase}.rb"
        unless File.exist?(file_name)
          m.reply "Could not load #{plugin} because #{File.basename(file_name)} does not exist."
          return
        end

        begin
          load(file_name)
        rescue Exception
          m.reply "Could not load #{plugin}."
          raise
        end

        begin
          const = Cinch::Plugins.const_get(plugin)
        rescue NameError
          m.reply "Could not load #{plugin} because no matching class was found."
          return
        end

        @bot.plugins.register_plugin(const)
        m.reply "Successfully loaded #{plugin}"
      end

      def unload_plugin(m, plugin)
        begin
          plugin_class = Cinch::Plugins.const_get(plugin.downcase.camelize)
        rescue NameError
          m.reply "Could not unload #{plugin} because no matching class was found."
          return
        end

        @bot.plugins.select {|p| p.class == plugin_class}.each do |p|
          @bot.plugins.unregister_plugin(p)
        end

        ## FIXME not doing this at the moment because it'll break
        ## plugin options. This means, however, that reloading a
        ## plugin is relatively dirty: old methods will not be removed
        ## but only overwritten by new ones. You will also not be able
        ## to change a classes superclass this way.
        # Cinch::Plugins.__send__(:remove_const, plugin)

        # Because we're not completely removing the plugin class,
        # reset everything to the starting values.
        plugin_class.hooks.clear
        plugin_class.matchers.clear
        plugin_class.listeners.clear
        plugin_class.timers.clear
        plugin_class.ctcps.clear
        plugin_class.react_on = :message
        plugin_class.plugin_name = nil
        plugin_class.help = nil
        plugin_class.prefix = nil
        plugin_class.suffix = nil
        plugin_class.required_options.clear

        m.reply "Successfully unloaded #{plugin}"
      end

      def reload_plugin(m, plugin)
        unload_plugin(m, plugin)
        load_plugin(m, plugin)
      end

      def set_option(m, plugin, option, value)
        begin
          const = Cinch::Plugins.const_get(plugin.downcase.camelize)
        rescue NameError
          m.reply "Could not set plugin option for #{plugin} because no matching class was found."
          return
        end
        @bot.config.plugins.options[const][option.to_sym] = eval(value)

        m.reply "Successfuly set option."
      end
    end
  end
end