const Command = require('../../structures/Command');
const { MessageEmbed } = require('discord.js');
const { stripIndents } = require('common-tags');

module.exports = class HelpCommand extends Command {
	constructor(client) {
		super(client, {
			name: 'help',
			aliases: ['commands'],
			group: 'util',
			memberName: 'help',
			description: 'Displays a list of available commands, or detailed information for a specified command.',
			guarded: true,
			clientPermissions: ['EMBED_LINKS'],
			args: [
				{
					key: 'command',
					prompt: 'Which command would you like to view the help for?',
					type: 'string',
					default: ''
				}
			]
		});
	}

	async run(msg, args) {
		const { command } = args;
		const commands = this.client.registry.findCommands(command, false, msg);
		if (command) {
			if (commands.length === 1) {
				const embed = new MessageEmbed()
					.setTitle(`Command ${commands[0].name}`)
					.setDescription(stripIndents`
						${commands[0].description}
						${commands[0].details || ''}
					`)
					.addField('❯ Format',
						msg.anyUsage(`${commands[0].name} ${commands[0].format ? commands[0].format : ''}`))
					.addField('❯ Aliases',
						commands[0].aliases.join(', ') || 'None')
					.addField('❯ Group',
						commands[0].group.name);
				return msg.embed(embed);
			} else if (commands.length > 1) {
				return msg.say(`Multiple commands found: ${commands.map(c => c.name).join(', ')}`);
			} else {
				return msg.say(`Could not identify command. Use ${msg.usage(null)} to view a list of commands.`);
			}
		} else {
			const embed = new MessageEmbed()
				.setTitle('Command List')
				.setDescription(`Use ${msg.usage('<command>')} to view detailed information about a command.`)
				.setColor(0x00AE86);
			for (const group of this.client.registry.groups.values()) {
				embed.addField(`❯ ${group.name}`,
					group.commands.map(c => c.name).join(', ') || 'None');
			}
			try {
				await msg.direct({ embed });
				return msg.say(':mailbox_with_mail: Sent you a DM with information.');
			} catch (err) {
				return msg.say('Failed to send DM. You probably have DMs disabled.');
			}
		}
	}
};