alvarocastro/diamondbot

import { ChatCommand, Discord } from '@diamondbot/core';
import dayjs from 'dayjs';
import preciseDiff from 'dayjs-precise-range';
dayjs.extend(preciseDiff);

const and = function (l) {
    const n = l.length;

    if (n === 1) {
        return l[0];
    }
    if (n === 2) {
        return l.join(' and ');
    }
    return `${l.slice(0, n - 1).join(', ')} and ${l[n - 1]}`;
};

export default class MemberageCommand extends ChatCommand {
    constructor (options = {}) {
        super(Object.assign({
            name: 'memberage',
            format: '[user]',
            description: 'Displays the time a member been on this server'
        }, options));
    }

    async exec ({member, channel, guild}, [user]) {
        let target;
        if (!user) {
            target = member;
        } else if (Discord.MessageMentions.USERS_PATTERN.test(user)) {
            target = await guild.members.fetch(user.replace(Discord.MessageMentions.USERS_PATTERN, '$1'));
        } else {
            const members = await guild.members.fetch({query: user});

            if (members.length > 1) {
                return await message.reply(`try mentioning, your command matched several users: ${members.join(', ')}`);
            } else if (members.length === 0) {
                return await message.reply(`try mentioning, user not found`);
            }
            target = members.first();
        }

        const measures = {
            years: ['year', 'years'],
            months: ['month', 'months'],
            days: ['day', 'days'],
            hours: ['hour', 'hours'],
            minutes: ['minute', 'minutes'],
            seconds: ['second', 'seconds']
        };

        const joined = dayjs(target.joinedTimestamp);
        const now = dayjs();

        const diff = dayjs.preciseDiff(joined, now, true);

        let count = 0;
        const timeParts = [];
        for (const [key, value] of Object.entries(diff)) {
            if (count === 3) {
                break;
            } else if (count > 0) {
                count++;
            }
            if (measures[key] && value > 0) {
                if (count === 0) {
                    count++;
                }
                timeParts.push(`${value} ${measures[key][value === 1 ? 0 : 1]}`);
            }
        }

        return await channel.send(`${target} has been a member of this server for ${and(timeParts)}.`);
    }
}