module.exports = (client) => {
	client.permlevel = message => {
		let permlvl = 0;

		const permOrder = client.config.permLevels.slice(0).sort((p, c) => p.level < c.level ? 1 : -1);

		while (permOrder.length) {
			const currentLevel = permOrder.shift();
			if (message.guild && currentLevel.guildOnly) continue;
			if (currentLevel.check(message)) {
				permlvl = currentLevel.level;
				break;
			}
		}
		return permlvl;
	};
	
	const defaultSettings = {
		"prefix": "~",
		"modLogChannel": "mod-log",
		"modRole": "Moderator",
		"adminRole": "Administrator",
		"systemNotice": "true",
		"welcomeChannel": "welcome",
		"welcomeMessage": "Say hello to {{user}}, everyone! We all need a warm welcome sometimes :D",
		"welcomeEnabled": "false"
	};
	
	client.getSettings = (guild) => {
		client.settings.ensure("default", defaultSettings);
		if(!guild) return client.settings.get("default");
		const guildConf = client.settings.get(guild.id) || {};
		return ({...client.settings.get("default"), ...guildConf});
	};
	
	client.awaitReply = async (msg, question, limit = 60000) => {
		const filter = m => m.author.id === msg.author.id;
		await msg.channel.send(question);
		try {
			const collected = await msg.channel.awaitMessages(filter, { max: 1, time: limit, errors: ["time"] });
			return collected.first().content;
		} catch (e) {
			return false;
		}
	};
	
	client.clean = async (client, text) => {
		if (text && text.constructor.name == "Promise")
			text = await text;
		if (typeof text !== "string")
			text = require("util").inspect(text, {depth: 1});

		text = text
			.replace(/`/g, "`" + String.fromCharCode(8203))
			.replace(/@/g, "@" + String.fromCharCode(8203))
			.replace(client.token, "mfa.VkO_2G4Qv3T--NO--lWetW_tjND--TOKEN--QFTm6YGtzq9PH--4U--tG0");

		return text;
	};

	client.loadCommand = (commandName) => {
		try {
			client.logger.log(`Loading Command: ${commandName}`);
			const props = require(`../${commandName}`);
			if (props.init) {
				props.init(client);
			}
			client.commands.set(props.help.name, props);
			props.conf.aliases.forEach(alias => {
				client.aliases.set(alias, props.help.name);
			});
			return false;
		} catch (e) {
			return `Unable to load command ${commandName}: ${e}`;
		}
	};

	client.unloadCommand = async (commandName) => {
		let command;
		if (client.commands.has(commandName)) {
			command = client.commands.get(commandName);
		} else if (client.aliases.has(commandName)) {
			command = client.commands.get(client.aliases.get(commandName));
		}
		if (!command) return `The command \`${commandName}\` doesn\'t seem to exist, nor is it an alias. Try again!`;
		
		if (command.shutdown) {
			await command.shutdown(client);
		}
		const mod = require.cache[require.resolve(`../commands/${command.help.category}/${command.help.name}`)];
		delete require.cache[require.resolve(`../commands/${command.help.category}/${command.help.name}.js`)];
		for (let i = 0; i < mod.parent.children.length; i++) {
			if (mod.parent.children[i] === mod) {
				mod.parent.children.splice(i, 1);
				break;
			}
		}
		return false;
	};
	
	Object.defineProperty(String.prototype, "toProperCase", {
		value: function() {
			return this.replace(/([^\W_]+[^\s-]*) */g, (txt) => txt.charAt(0).toUpperCase() + txt.substr(1).toLowerCase());
		}
	});
	
	Object.defineProperty(Array.prototype, "random", {
		value: function() {
			return this[Math.floor(Math.random() * this.length)];
		}
	});
	
	client.wait = require("util").promisify(setTimeout);

	process.on("uncaughtException", (err) => {
		const errorMsg = err.stack.replace(new RegExp(`${__dirname}/`, "g"), "./");
		client.logger.error(`Uncaught Exception: ${errorMsg}`);
		console.error(err);
		process.exit(1);
	});

	process.on("unhandledRejection", err => {
		client.logger.error(`Unhandled rejection: ${err}`);
		console.error(err);
	});
};