(function() {
	'use strict';

	const getDateDiff = (a, b) => Math.abs(a - b);

	let
		now = null,
		finalWeight = 3240,
		finalDate = new Date(2018, 11, 2, 23, 6),
		isDone = finalWeight && finalDate;

	Date.prototype.formatted = function () {
		return this.toLocaleDateString('sv-se', {
			month: 'short',
			day: 'numeric',
		});
	}

	Date.prototype.formattedTime = function () {
		return this.toLocaleTimeString('sv-se', {
			hour: '2-digit',
			minute: '2-digit'
		});
	}

	Date.prototype.formattedTimeLong = function () {
		return this.toLocaleTimeString('sv-se', {
			hour: '2-digit',
			minute: '2-digit',
			second: '2-digit'
		});
	}

	Date.prototype.getWeek = function () {
		const d = new Date(Date.UTC(this.getFullYear(), this.getMonth(), this.getDate()));
		d.setUTCDate(d.getUTCDate() + 4 - (d.getUTCDay() || 7));

		const
			yearStart = new Date(Date.UTC(d.getUTCFullYear(), 0, 1)),
			weekNo = Math.ceil((((d - yearStart) / 86400000) + 1) / 7);

		return weekNo;
	}

	function getCurrentWeight() {
		const
			startWeight = 2380,
			lastMeasure = new Date(2018, 9, 16, 22),
			weightIncPerDay = 28.78,
			weightIncPerMs = weightIncPerDay / 24 / 60 / 60 / 1000,
			msSinceLastMeasure = getDateDiff(lastMeasure, now),
			currentWeight = startWeight + (weightIncPerMs * msSinceLastMeasure);

		return finalWeight || currentWeight;
	}

	function person (name, month, day, hour, minute, weight) {

		function getTimeScore() {
			const
				normDate = (h, m, day = 1, s = 0, ms = 0) => new Date(2018, 1, day, h, m, s, ms),
				current = normDate(now.getHours(), now.getMinutes(), 1, now.getSeconds(), now.getMilliseconds()),
				guessedToday = normDate(hour, minute, 1),
				guessedTomorrow = normDate(hour, minute, 2),
				today = getDateDiff(current, guessedToday),
				tomorrow = getDateDiff(current, guessedTomorrow),
				diff = Math.min(today, tomorrow),
				percentageMax = 33,
				max = 24 * 60 * 60 * 1000 / 2,
				score = (percentageMax / max) * (max - diff);

			return Math.abs(score);
		}

		function getDateScore() {
			let
				n = new Date(2018, now.getMonth(), now.getDate()),
				d = new Date(2018, month, day),
				x = (d - n) / (1000 * 60 * 60 * 24);

			x = Math.abs(Math.round(x));
			x = x === 0 ? 1 : x * 1.12;
			return 33 / x;
		}

		function getWeightScore() {
			const
				diff = Math.abs(weight - getCurrentWeight()),
				percentageMax = 33,
				max = 4000,
				score = (percentageMax / max) * (max - diff);

			return score > 0 ? score : 0;
		}

		return {
			name,
			weight,
			date: new Date(2018, month, day, hour, minute),
			img: `avatars/${name}.jpg`,
			score: (function () {
				const
					time = getTimeScore(),
					day = getDateScore(),
					weight = getWeightScore(),
					total = Math.round((time + day + weight) * 10000);

				return {
					time,
					day,
					weight,
					total
				};
			}())
		}
	}

	function getData() {
		now = finalDate || new Date();

		const persons = [
			// name, month, date, hour, minute, weight
			person('Jeanna', 11, 1, 6, 10, 3650),
			person('Simon', 10, 30, 6, 34, 3870),
			person('Nora', 10, 30, 6, 34, 3870),
			person('Viktoria', 10, 30, 11, 32, 3500),
			person('Niclas', 11, 1, 23, 0, 3450),
			person('Per', 11, 1, 13, 37, 3991),
			person('Jimmy G', 11, 3, 0, 1, 3671),
			person('Farbror', 11, 1, 13, 37, 4422),
			person('Erik', 10, 26, 17, 0, 3200),
			person('Anna', 10, 20, 23, 0, 4000),
			person('Pelle', 10, 27, 7, 23, 3152),
			person('Linnea', 10, 30, 4, 30, 3400),
			person('Frida', 10, 28, 14, 15, 3678),
			person('Malin', 10, 5, 5, 0, 3854),
			person('Alex', 10, 25, 16, 6, 3597),
			person('Robert', 10, 11, 14, 30, 2800),
			person('Fredric', 10, 28, 1, 52, 3450),
			person('Moster', 10, 21, 19, 15, 3528),
			person('Anna O', 11, 1, 18, 30, 3764),
			person('Jimmy S', 11, 3, 16, 32, 4092),
			person('Jonas', 10, 23, 12, 27, 3300),
			person('Karla', 10, 27, 1, 0, 3400),
			person('Mormor', 10, 27, 16, 35, 3675),
			person('Morbror', 10, 24, 6, 12, 3450),
			person('Karin', 11, 2, 14, 37, 3915),
			person('Morfar', 10, 28, 6, 35, 3682)

		].sort((a, b) => b.score.total - a.score.total);

		const cards = (function () {
			function createCard(icon, text, value) {
				return {
					icon: `icons/${icon}.png`,
					text,
					value
				}
			}

			const
				est = new Date(2018, 10, 26),
				totalPregDays = 40 * 7,
				daysLeft = Math.floor((est - now) / 86400000) + 1,
				progress = Math.floor(((totalPregDays - daysLeft) / totalPregDays) * 100),
				pregWeek = now.getWeek() - 7;

			return {
				top: [
					createCard('star', 'Beräknat', est.formatted()),
					createCard('week', 'Gravidvecka', pregWeek),
					createCard('pie', 'Avklarat', progress + '%'),
					createCard('speed', 'Dagar kvar', daysLeft)
				],
				bottom: [
					createCard('cal', isDone ? 'Datum' : 'Dagens datum', now.formatted()),
					createCard('time', isDone ? 'Klockan' : 'Klockan är', now.formattedTimeLong()),
					createCard('weight', isDone ? 'Matchvikt' : 'Nuvarande matchvikt', getCurrentWeight().toFixed(4) + 'g' )
				]
			};
		}());

		return {
			persons,
			cards,
			winner: isDone && persons[0]
		};
	}

	const app = new Vue({
		el: '#app',
		data: {
			data: getData()
		}
	});

	function poll() {
		app.data = getData();
		window.requestAnimationFrame(poll);
	}

	document.body.className = isDone ? 'done' : '';

	poll();

}());