/* This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

/*
 * There are a variety of non-standard extensions to IRC that are implemented by
 * different servers. This implementation is based on a combination of
 * documentation and reverse engineering. Each handler must include a comment
 * listing the known servers that support this extension.
 *
 * Resources for these commands include:
 *  https://github.com/atheme/charybdis/blob/master/include/numeric.h
 *  https://github.com/unrealircd/unrealircd/blob/unreal42/include/numeric.h
 */
import { XPCOMUtils } from "resource://gre/modules/XPCOMUtils.sys.mjs";
import { l10nHelper } from "resource:///modules/imXPCOMUtils.sys.mjs";
import { ircHandlerPriorities } from "resource:///modules/ircHandlerPriorities.sys.mjs";
import {
  conversationErrorMessage,
  kListRefreshInterval,
} from "resource:///modules/ircUtils.sys.mjs";

const lazy = {};
XPCOMUtils.defineLazyGetter(lazy, "_", () =>
  l10nHelper("chrome://chat/locale/irc.properties")
);

export var ircNonStandard = {
  name: "Non-Standard IRC Extensions",
  priority: ircHandlerPriorities.DEFAULT_PRIORITY + 1,
  isEnabled: () => true,

  commands: {
    NOTICE(aMessage) {
      // NOTICE <msgtarget> <text>

      if (
        aMessage.params[1].startsWith("*** You cannot list within the first")
      ) {
        // SECURELIST: "You cannot list within the first N seconds of connecting.
        // Please try again later." This NOTICE will be followed by a 321/323
        // pair, but no list data.
        // We fake the last LIST time so that we will retry LIST the next time
        // the user requires it after the interval specified.
        const kMinute = 60000;
        let waitTime = aMessage.params[1].split(" ")[7] * 1000 || kMinute;
        this._lastListTime = Date.now() + waitTime - kListRefreshInterval;
        return true;
      }

      // If the user is connected, fallback to normal processing, everything
      // past this points deals with NOTICE messages that occur before 001 is
      // received.
      if (this.connected) {
        return false;
      }

      let target = aMessage.params[0].toLowerCase();

      // If we receive a ZNC error message requesting a password, the
      // serverPassword preference was not set by the user. Attempt to log into
      // ZNC using the account password.
      if (
        target == "auth" &&
        aMessage.params[1].startsWith("*** You need to send your password.")
      ) {
        if (this.imAccount.password) {
          // Send the password now, if it is available.
          this.shouldAuthenticate = false;
          this.sendMessage(
            "PASS",
            this.imAccount.password,
            "PASS <password not logged>"
          );
        } else {
          // Otherwise, put the account in an error state.
          this.gotDisconnected(
            Ci.prplIAccount.ERROR_AUTHENTICATION_IMPOSSIBLE,
            lazy._("connection.error.passwordRequired")
          );
        }

        // All done for ZNC.
        return true;
      }

      // Some servers, e.g. irc.umich.edu, use NOTICE during connection
      // negotiation to give directions to users, these MUST be shown to the
      // user. If the message starts with ***, we assume it is probably an AUTH
      // message, which falls through to normal NOTICE processing.
      // Note that if the user's nick is auth this COULD be a notice directed at
      // them. For reference: moznet sends Auth (previously sent AUTH), freenode
      // sends *.
      let isAuth = target == "auth" && this._nickname.toLowerCase() != "auth";
      if (!aMessage.params[1].startsWith("***") && !isAuth) {
        this.getConversation(aMessage.origin).writeMessage(
          aMessage.origin,
          aMessage.params[1],
          {
            incoming: true,
            tags: aMessage.tags,
          }
        );
        return true;
      }

      return false;
    },

    "042": function (aMessage) {
      // RPL_YOURID (IRCnet)
      // <nick> <id> :your unique ID
      return true;
    },

    307(aMessage) {
      // TODO RPL_SUSERHOST (AustHex)
      // TODO RPL_USERIP (Undernet)
      // <user ips>

      // RPL_WHOISREGNICK (Unreal & Bahamut)
      // <nick> :is a registered nick
      if (aMessage.params.length == 3) {
        return this.setWhois(aMessage.params[1], { registered: true });
      }

      return false;
    },

    317(aMessage) {
      // RPL_WHOISIDLE (Unreal & Charybdis)
      // <nick> <integer> <integer> :seconds idle, signon time
      // This is a non-standard extension to RPL_WHOISIDLE which includes the
      // sign-on time.
      if (aMessage.params.length == 5) {
        this.setWhois(aMessage.params[1], { signonTime: aMessage.params[3] });
      }

      return false;
    },

    328(aMessage) {
      // RPL_CHANNEL_URL (Bahamut & Austhex)
      // <channel> :<URL>
      return true;
    },

    329(aMessage) {
      // RPL_CREATIONTIME (Bahamut & Unreal)
      // <channel> <creation time>
      return true;
    },

    330(aMessage) {
      // TODO RPL_WHOWAS_TIME

      // RPL_WHOISACCOUNT (Charybdis, ircu & Quakenet)
      // <nick> <authname> :is logged in as
      if (aMessage.params.length == 4) {
        let [, nick, authname] = aMessage.params;
        // If the authname differs from the nickname, add it to the WHOIS
        // information; otherwise, ignore it.
        if (this.normalize(nick) != this.normalize(authname)) {
          this.setWhois(nick, { registeredAs: authname });
        }
      }
      return true;
    },

    335(aMessage) {
      // RPL_WHOISBOT (Unreal)
      // <nick> :is a \002Bot\002 on <network>
      return this.setWhois(aMessage.params[1], { bot: true });
    },

    338(aMessage) {
      // RPL_CHANPASSOK
      // RPL_WHOISACTUALLY (ircu, Bahamut, Charybdis)
      // <nick> <user> <ip> :actually using host
      return true;
    },

    378(aMessage) {
      // RPL_WHOISHOST (Unreal & Charybdis)
      // <nick> :is connecting from <host> <ip>
      let [host, ip] = aMessage.params[2].split(" ").slice(-2);
      return this.setWhois(aMessage.params[1], { host, ip });
    },

    379(aMessage) {
      // RPL_WHOISMODES (Unreal, Inspircd)
      // <nick> :is using modes <modes>
      // Sent in response to a WHOIS on the user.
      return true;
    },

    396(aMessage) {
      // RPL_HOSTHIDDEN (Charybdis, Hybrid, ircu, etc.)
      // RPL_VISIBLEHOST (Plexus)
      // RPL_YOURDISPLAYEDHOST (Inspircd)
      // <host> :is now your hidden host

      // This is the host that will be sent to other users.
      this.prefix = "!" + aMessage.user + "@" + aMessage.params[1];
      return true;
    },

    464(aMessage) {
      // :Password required
      // If we receive a ZNC error message requesting a password, eat it since
      // a NOTICE AUTH will follow causing us to send the password. This numeric
      // is, unfortunately, also sent if you give a wrong password. The
      // parameter in that case is "Invalid Password".
      return (
        aMessage.origin == "irc.znc.in" &&
        aMessage.params[1] == "Password required"
      );
    },

    470(aMessage) {
      // Channel forward (Unreal, inspircd)
      // <requested channel> <redirect channel>: You may not join this channel,
      // so you are automatically being transferred to the redirect channel.
      // Join redirect channel so when the automatic join happens, we are
      // not surprised.
      this.joinChat(this.getChatRoomDefaultFieldValues(aMessage.params[2]));
      // Mark requested channel as left and add a system message.
      return conversationErrorMessage(
        this,
        aMessage,
        "error.channelForward",
        true,
        false
      );
    },

    499(aMessage) {
      // ERR_CHANOWNPRIVNEEDED (Unreal)
      // <channel> :You're not the channel owner (status +q is needed)
      return conversationErrorMessage(this, aMessage, "error.notChannelOwner");
    },

    671(aMessage) {
      // RPL_WHOISSECURE (Unreal & Charybdis)
      // <nick> :is using a Secure connection
      return this.setWhois(aMessage.params[1], { secure: true });
    },

    998(aMessage) {
      // irc.umich.edu shows an ASCII captcha that must be typed in by the user.
      this.getConversation(aMessage.origin).writeMessage(
        aMessage.origin,
        aMessage.params[1],
        {
          incoming: true,
          noFormat: true,
        }
      );
      return true;
    },
  },
};