const { ArgumentType, util } = require('discord.js-commando');
const { escapeMarkdown } = require('discord.js');

class EmojiArgumentType extends ArgumentType {
	constructor(client) {
		super(client, 'emoji');
	}

	validate(value, msg) {
		const matches = value.match(/^(?:<:([a-zA-Z0-9_]+):)?([0-9]+)>?$/);
		if (matches) {
			const emoji = msg.client.emojis.get(matches[2]);
			if (emoji) return true;
		}
		if (!msg.guild) return false;
		const search = value.toLowerCase();
		const emojis = msg.guild.emojis.filter(emoji => emoji.name.toLowerCase() === search);
		if (!emojis.length) return false;
		if (emojis.length === 1) return true;
		return emojis.length <= 15
			? `${util.disambiguation(emojis.map(emoji => escapeMarkdown(emoji.name)), 'emojis', null)}\n`
			: 'Multiple emojis found. Please be more specific.';
	}

	parse(value, msg) {
		const matches = value.match(/^(?:<:([a-zA-Z0-9_]+):)?([0-9]+)>?$/);
		if (matches) return msg.client.emojis.get(matches[2]);
		if (!msg.guild) return null;
		const search = value.toLowerCase();
		const emojis = msg.guild.emojis.filter(emoji => emoji.name.toLowerCase() === search);
		if (!emojis.length) return null;
		if (emojis.length === 1) return emojis[0];
		return null;
	}
}

module.exports = EmojiArgumentType;