# IRC backend.
module Backend_IRC
   require 'cinch'

   # Helper for channel permissions.
   class ChannelPerms
      def initialize() @cprm = {} end

      # @param chan [Backend_IRC::Channel] the channel for this permission
      # @return [Boolean] true if the channel is enabled, false otherwise.
      def [](chan) @cprm[chan.name] end

      # Sets a channel's permission on/off.
      # @param name [String] the channel for this permission
      # @param set [Boolean] if this permission should be set
      # @return [void]
      def []=(name, set) @cprm[name] = set end
   end

   # An IRC user.
   class User < Vrobot4::Server::User
      attr_reader :real # The Cinch::User instance.

      # @param user [Cinch::User] the irc user
      # @param chan [Cinch::Channel] the irc channel this object was made in
      def initialize user, chan
         @real = user
         @name = user.nick
         @id   = Vrobot4.hash_str user.nick.downcase
            if user.oper?            then @roles = "Oohv"
         elsif chan.opped?      user then @roles = "ohv"
         elsif chan.half_opped? user then @roles = "hv"
         elsif chan.voiced?     user then @roles = "v"
         else                             @roles = "" end
      end
   end

   # An IRC channel.
   class Channel < Vrobot4::Server::Channel
      attr_reader :real # The Cinch::Channel instance.

      # @param chan [Cinch::Channel] the irc channel
      def initialize chan
         @real = chan
         @name = chan.name.downcase
         @id   = Vrobot4.hash_str chan.name.downcase
      end
   end

   # An IRC server.
   class Server < Vrobot4::Server::Server
      # The server type name.
      def self.type() "IRC" end

      # (see Vrobot4::Server::Server#initialize)
      def initialize info, bot
         super
         @id = Vrobot4.hash_str info["server"].downcase

         for mod in info["modules"] do
            load_mod mod
         end
      end

      # (see Vrobot4::Server::Server#flags)
      def flags
         ?L
      end

      protected

      # (see Vrobot4::Server::Server#load_permissions)
      def load_permissions pinf
         @mprm = {chan: {}, role: {}, glob: {}}
         return unless pinf
         pinf.each do |pr|
            mod = Vrobot4::Module.get_module_type(pr["module"])[:type]
            if pr.key? "channel"
               @mprm[:chan][mod] = ChannelPerms.new unless @mprm[:chan][mod]
               @mprm[:chan][mod][pr["channel"].downcase] = true
            elsif pr.key? "roles"
               @mprm[:role][mod] = pr["roles"]
            elsif pr.key? "enable"
               @mprm[:glob][mod] = pr["enable"]
            end
         end
      end
   end

   # A bot implementation for IRC using cinch.
   class Bot < Vrobot4::Robots::Bot
      # The bot type name.
      def self.type() "IRC" end
      Vrobot4::Robots.add_bot_type self

      attr_accessor :serv # @return [Vrobot4::Server::Server] the server

      # (see Vrobot4::Robots::Bot#initialize)
      def initialize info
         super
         this = self

         @bot = Cinch::Bot.new do
            configure do |cfg|
               cfg.server   = info["server"]
               cfg.nick     = info["nick"] || "vrobot4"
               cfg.port     = info["port"]     if info.key? "port"
               cfg.password = info["pass"]     if info.key? "pass"
               cfg.modes    = info["modes"]    if info.key? "modes"
               cfg.channels = info["channels"] if info.key? "channels"
               cfg.realname = "vrobot4"
               cfg.user     = "vrobot4"
               cfg.message_split_start = "… "
               cfg.message_split_end   = " …"
            end

            on :message do |evt|
               return unless evt.channel

               m = Vrobot4::Server::Message.new \
                  msg:  evt.message,
                  user: User.new(evt.user, evt.channel),
                  chan: Channel.new(evt.channel),
                  serv: this.serv,
                  reply:   -> (text) {evt.reply text},
                  reply_b: -> (text) {evt.reply text}

               this.serv.handle_text_cmd m
            end
         end

         @bot.loggers.level = :warn
         @serv = Server.new info, self
      end

      # (see Vrobot4::Robots::Bot#connect)
      def connect
         @bot.start
      end
   end
end

## EOF