/*
    An IRC bot to sync Brainlet categories
    Copyright (C) 2020  hiimgoodpack

    This program is free software: you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
    the Free Software Foundation, either version 3 of the License, or
    (at your option) any later version.

    This program is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU General Public License for more details.

    You should have received a copy of the GNU General Public License
    along with this program.  If not, see <https://www.gnu.org/licenses/>.
*/

const ircClient = require("irc");
// Node's replaceAll is a new feature. We'll use a package instead
const replaceAll = require("replaceall");
const brainlet = require("../brainlet-lib/index.js");

module.exports = {
	start: (config, {tokens, sockets, availableBots, channelNameToCategoryId, categoryIdToChannelName}) => {
		let bot = new ircClient.Client("localhost", "ChanServ", {
			realName: "A bot to sync channels from a Brainlet instance to the IRC server"
		});

		const getRandomToken = () => {
			const names = Object.keys(tokens);
			let nameIndex = Math.floor(Math.random() * names.length);
			// Floating point rounding might make nameIndex >= tokens.length, which we don't want
			if (nameIndex >= tokens.length)
				nameIndex = tokens.length-1;

			return tokens[names[nameIndex]];
		}

		const commands = {
			help: (from) => {
				bot.notice(from, config.responses.ChanServ.help);
			},
			invite: (from) => {
				if (!tokens[from]) {
					bot.notice(from, config.responses.ChanServ.accessDenied);
					return;
				}
				Object.keys(channelNameToCategoryId).forEach((channelName) => {
					bot.send("INVITE", from, channelName);
				})
			},
			create: (from, args) => {
				if (!tokens[from]) {
					bot.notice(from, config.responses.ChanServ.accessDenied);
					return;
				}
				const categoryTitle = args.splice(1).join(" ");

				bot.notice(from, `Creating category ${categoryTitle}...`);
				brainlet.categories.create(config.server, tokens[from], categoryTitle).then(() => {
					bot.notice(from, "Successfully created category on Brainlet\n" +
						"You may need to wait a few seconds for a category sync to occur to use the channel");
				}).catch((error) => {
					bot.notice(from, `Failed to create category: ${error}`);
				});
			}
		};

		bot.addListener("error", console.error);
		bot.addListener("message", (from, channel, text, message) => {
			// Make sure it's a private message channel the bot
			if (channel !== bot.opt.nick)
				return;

			const args = text.split(" ");
			if (args.length == 0) {
				bot.notice(from, config.responses.ChanServ.invalid);
				return;
			}

			const command = commands[args[0].toLowerCase()];
			if (!command) {
				bot.notice(from, config.responses.ChanServ.invalid);
				return;
			}

			command(from, args);
		});
		bot.addListener("join", (channel, nick) => {
			bot.send("MODE", channel, "+v", nick);

			// Is it a bot?
			if (availableBots[nick]) {
				// Give it channel op
				bot.send("MODE", channel, "+o", nick);
			} else {
				const socket = sockets[nick];
				const categoryId = channelNameToCategoryId[channel];
				console.log(socket);
				socket.connect(categoryId).then(() => {
					console.log("Successfully joined channel");
				});
			}
		});

		// We need 2 hexadecimal digits for a buffer to work
		let nextId = 0xF+1;
		const categoryToChannelName = (name) => {
			return `#${replaceAll(" ", "_", name)}_${Buffer.from((nextId++).toString(16), "hex").toString("base64")}`;
		};
		// Update category list
		setInterval(() => {
			const token = getRandomToken();
			if (!token)
				return;
			// TODO: Handle having more than 100 categories
			// Alternatively, send a notice if there is more than 100 categories
			const maxCategories = 100;
			brainlet.categories.list(config.server, token, maxCategories).then((categories) => {
				for (const {_id: categoryId, title: categoryTitle, creator: {username: creatorUsername}} of categories) {
					// Make sure this is a new channel
					if (categoryIdToChannelName[categoryId])
						continue;
					
					const channelName = categoryToChannelName(categoryTitle);

					bot.join(channelName, () => {
						channelNameToCategoryId[channelName] = categoryId;
						categoryIdToChannelName[categoryId] = channelName;
						bot.send("TOPIC", channelName, `${ircClient.colors.wrap("light_blue", categoryTitle)} by ${ircClient.colors.wrap("light_red", creatorUsername)}`);

						// Invite only
						bot.send("MODE", channelName, "+i");
						// Allow mutes
						bot.send("MODE", channelName, "+m");

						// Invite everyone who is logged in
						Object.keys(tokens).forEach((nick) => {
							bot.send("INVITE", nick, channelName);
						});
						Object.keys(availableBots).forEach((nick) => {
							if (nick === "ChanServ")
								return;
							bot.send("INVITE", nick, channelName);
						});
					});
				}
			}).catch((error) => {
				console.error(`An error occured when updating category list: ${error}`);
			});
		}, 5000);
	}
}