const request = require("request");
const rp = require("request-promise");
const ical = require('node-ical');

const bdayIcal = await rp(process.env.ICAL_FILE_URL);
const events = ical.sync.parseICS(bdayIcal);

// What day is it again?
const today = new Date();
today.setHours(0,0,0,0);
const tomorrow = new Date(today);
tomorrow.setDate(today.getDate() + 1);
const nextDay = new Date(today);
nextDay.setDate(today.getDate() + 2);

// What day of the week is it? 0 = Sunday, 6 = Saturday
const dayNum = today.getDay();
if (dayNum === 0 || dayNum === 6) {
    return; // don't run on weekends, could also be set with the cron schedule...
}

// Birthday Message Base
let birthdayMsg = ""

// Birthday Emoji List
let birthdayEmojis = [
    'cake',
    'tada',
    'sparkling',
    'fast_parrot',
    'fiesta_parrot',
    'partying_face',
    'amaze',
    'cool-doge',
    'floss_avocado',
    'highfive',
    'mushroom_dance',
    'party_pikachu',
    'yay-avocado',
    'catjam',
    'happy_dance',
    'dogepls',
    'dancing_doge',
    'yay',
    'charmander_dancing',
    'yay_tomato'
]

const nScaliens = Object.values(events).length;
const prob = ((364.0/365.0)**nScaliens)*100;

let noBirthdayMsgs = [
    "No birthdays today :flushed: let's go hire some more Scaliens!",
    `No one was born today :sad-panda: Assuming ${nScaliens} Scaliens, that's a ${prob.toFixed(1)}% likely outcome. :nerd_face:`,
    "Nothing to celebrate today :sad_parrot: Our parents must have had better things to do 39 weeks and some years ago :woman-shrugging: :man-shrugging:",
    "Not a single Scalien was born on this day :wow:",
    "A very happy unbirthday to us all! None of us have birthdays today... :crying-swag:",
    "If you have a clever remark about no one having a birthday today, this is the time to share it. :think-up: (No, seriously, we'll add it to the list)",
    "Today's not your birthday, but at least you're in good company :heart-scale: - It's no one's birthday today at Scale.",
    "No birthdays today. Koan: A blank space on the tapestry of life. If no thread is woven this day, is the tapestry any less complete?"
];

let noBirthdayNames = [
    "Charlotte Zhuang"
]

for (const event of Object.values(events)) {    
    if (event.summary) { // All of a sudden invites may not have a summary???
        const name = event.summary.replace(' - Birthday', ''); // Name of person

        if (noBirthdayNames.includes(name)) {
            continue;
        }

        isBirthday = false;
        
        if (dayNum > 0 && dayNum < 5) { // Monday - Thursday
            isBirthday = today.toISOString() == event.start.toISOString();
        } else { // It's Friday, because Sat / Sun are skipped above
            isBirthday = (
                today.toISOString() === event.start.toISOString() ||
                tomorrow.toISOString() === event.start.toISOString() ||
                nextDay.toISOString() === event.start.toISOString()
            )
        }

        if (isBirthday) {
            const month = event.start.toLocaleString('default', { month: 'long' }); // April
            const day = event.start.getDate(); // 25
            const emojiNum = Math.floor(Math.random() * birthdayEmojis.length);
            birthdayMsg = birthdayMsg + `> *${name}* - ${month} ${day} :${birthdayEmojis[emojiNum]}:\n> \n`;
        }
    }
};

if (birthdayMsg) {
    birthdayMsg = ':birthday: *A very happy birthday to the following Scaliens* :birthday:\n\n' + birthdayMsg
} else {
    birthdayMsg = noBirthdayMsgs[today.getDate() % noBirthdayMsgs.length];
}
console.log(birthdayMsg);

await rp({
    method: 'POST',
    uri: process.env.BIRTHDAY_BOT_WEBHOOK_URL,
    body: {
        text: birthdayMsg
    },
    json: true // Automatically stringifies the body to JSON
});