import { QUICK_LINKS } from './config.js';

globalThis.browser ??= chrome;

const dateTimeFormat = Intl.DateTimeFormat([], { dateStyle: 'medium', timeStyle: 'short' });

if (document.readyState === 'loading') {
	document.addEventListener('DOMContentLoaded', async () => {
		await init();
	});
} else {
	await init();
}

async function init() {
	setL10n();
	setLinks();

	/**
	 * @type {import("../types").Storage}
	 */
	const { calendar, spaceApi } = await browser.storage.session.get(['calendar', 'spaceApi']);

	if (calendar) {
		updateNextEvent(calendar);
	}
	if (spaceApi) {
		updateSpaceApiJson(spaceApi);
		updateState(spaceApi);
	}
}

function setL10n() {
	document.querySelector('html').setAttribute('lang', browser.i18n.getUILanguage());

	const loadingText = browser.i18n.getMessage('loading');
	document.querySelector('#state').textContent = loadingText;
	document.querySelector('#calendar').textContent = loadingText;
	document.querySelector('#space-api > code').textContent = loadingText;
	document.querySelector('#currentState').textContent = browser.i18n.getMessage('currentState');
	document.querySelector('#links').textContent = browser.i18n.getMessage('links');
	document.querySelector('#nextEvent').textContent = browser.i18n.getMessage('nextEvent');
	document.querySelector('#spaceApiJson').textContent = browser.i18n.getMessage('spaceApiJson');
}

function setLinks() {
	const listElement = document.querySelector('#link-list');

	for (const quickLink of QUICK_LINKS) {
		const template = getCleanTemplateById('template-link-item');

		const linkElement = template.querySelector('.link');
		linkElement.dataset.url = quickLink.url;
		linkElement.addEventListener('click', linkElementClickListener);

		const svgIcon = getCleanTemplateById(quickLink.iconTemplateId);
		svgIcon.querySelector('svg').setAttribute('aria-label', quickLink.text);
		template.querySelector('.icon').append(svgIcon);

		template.querySelector('.text').textContent = quickLink.text;

		listElement.append(template);
	}
}

/**
 * @param {Event} event
 */
async function linkElementClickListener(event) {
	try {
		await browser.tabs.create({ url: event.currentTarget.dataset.url });
	} catch (error) {
		console.error(error);
	}
}

/**
 * @param {import("../types").Calendar} nextEvents
 */
function updateNextEvent(nextEvents) {
	const calendarElement = document.querySelector('#calendar');
	calendarElement.textContent = '';

	if (nextEvents.length === 0) {
		const strongElement = document.createElement('strong');
		strongElement.textContent = browser.i18n.getMessage('noEventsInNext4Weeks');
		calendarElement.append(strongElement);
	} else {
		const nextEventDate = nextEvents[0].begin.slice(0, 10);
		const nextEventDateEvents = nextEvents.filter((nextEvent) => (nextEvent.begin.startsWith(nextEventDate)));

		for (const nextEventDateEvent of nextEventDateEvents) {
			calendarElement.append(buildCalendarEntryElement(nextEventDateEvent));
		}
	}
}

/**
 * @param {import("../types").CalendarEntry} nextEventDateEvent
 * @returns {DocumentFragment}
 */
function buildCalendarEntryElement(nextEventDateEvent) {
	const calendarEntryElement = getCleanTemplateById('template-calendar-entry');

	calendarEntryElement.querySelector('svg').setAttribute('aria-label', browser.i18n.getMessage('event'));

	calendarEntryElement.querySelector('strong').textContent = nextEventDateEvent.name;

	const timeElement = calendarEntryElement.querySelector('time');
	const beginDate = new Date(nextEventDateEvent.begin);
	timeElement.dateTime = beginDate.toISOString();
	timeElement.textContent = dateTimeFormat.format(beginDate);

	if (nextEventDateEvent.location) {
		const locationElement = getCleanTemplateById('template-calendar-entry-location');

		locationElement.querySelector('address').textContent = nextEventDateEvent.location;

		calendarEntryElement.querySelector('.calendar-entry > div').append(locationElement);
	}

	return calendarEntryElement;
}

/**
 * @param {import("../types").SpaceApi} spaceApi
 */
function updateSpaceApiJson(spaceApi) {
	const spaceApiElement = document.querySelector('#space-api > code');
	spaceApiElement.textContent = JSON.stringify(spaceApi, null, 2);
}

/**
 * @param {import("../types").SpaceApi} spaceApi
 */
function updateState(spaceApi) {
	const state = spaceApi.state.open ? 'open' : 'closed';

	const stateElements = getCleanTemplateById('template-state');

	const svgIconState = getCleanTemplateById(`template-icon-${state}`);
	svgIconState.querySelector('svg').setAttribute('aria-label', browser.i18n.getMessage(state));
	stateElements.querySelector('svg').replaceWith(svgIconState);

	stateElements.querySelector('span').textContent = browser.i18n.getMessage(spaceApi.state.open ? 'openSince' : 'closedSince');

	const timeElement = stateElements.querySelector('time');
	const since = new Date(spaceApi.state.lastchange * 1000);
	timeElement.dateTime = since.toISOString();
	timeElement.textContent = dateTimeFormat.format(since);

	const stateElement = document.querySelector('#state');
	stateElement.textContent = '';
	stateElement.append(stateElements);
}

/**
 * @param {string} templateId
 * @returns {DocumentFragment}
 */
function getCleanTemplateById(templateId) {
	const template = document.querySelector(`#${templateId}`).content.cloneNode(true);
	if (template.hasChildNodes()) {
		for (const childNode of template.childNodes) {
			if (childNode.nodeType !== Node.ELEMENT_NODE) {
				childNode.remove();
			}
		}
	}
	return template;
}