import { api_url } from '/js/settings.js';
import * as api from '/js/api.js';

function create_notification_element_from_notification_object(notification) {
	
	const e_container = document.createElement('div');
	e_container.classList = `status status-${notification.type}`;
	e_container.setAttribute('notification_id', "" + notification.id);
	e_container.setAttribute('notification_hash', "" + notification.hash);

	const e_title_span = document.createElement('span');
	e_title_span.innerText = notification.title;

	const e_title = document.createElement('div');
	e_title.classList = 'status-title';
	e_title.appendChild(e_title_span)

	const e_progress = document.createElement('progress');
	if ('progress' in notification) {
		if(notification.progress !== null) {
			e_progress.setAttribute('value', notification.progress);
		}
	} else e_progress.style.display = 'none';

	const e_text = document.createElement('div');
	e_text.classList = 'status-text';
	e_text.innerHTML = notification.text;
	
	const e_delete_button = document.createElement('button');
	e_delete_button.classList = 'dismiss';
	e_delete_button.innerText = "Dismiss";
	e_delete_button.addEventListener('click', () => {
		api.notifications.remove(notification.id);
	})

	e_container.appendChild(e_title);
	e_container.appendChild(e_progress);
	e_container.appendChild(e_text);
	// e_container.appendChild(e_delete_button);

	return e_container;
}

function begin_status_update_loop() {
	const statuses_container = document.getElementById('statuses');
	const clear_button = document.getElementById('clear-notifications-button');
	const notif_header = document.getElementById('notif-header');

	clear_button.addEventListener('click', () => {
		api.notifications.remove_all();
	})

	function get_current_shown_status_ids() {
		let arr = [];
		for(const element of statuses_container.children) {
			arr.push(element.getAttribute("notification_id"))
		}
		return arr;
	}

	async function check_statuses() {
		const active = await api.notifications.get_active();
		const failed = await api.notifications.get_failed();
		const succeeded = await api.notifications.get_succeeded();
		
		notif_header.textContent = `${active.length} Active | ${failed.length} Failed | ${succeeded.length} Succeeded`;
		
		let req = await fetch(await api_url('notifications'));
		let json = await req.json();

		const current_status_ids = get_current_shown_status_ids();
		const new_status_ids = json.map(v => v.id);

		const combined_ids = Array.from(new Set([
			...current_status_ids,
			...new_status_ids
		]));

		const first = new Map(combined_ids.map(notif_id => [
			notif_id,
			document.querySelector(`[notification_id="${notif_id}"]`)?.getBoundingClientRect() ?? null
		]));

		console.log(first);

		for(const status_id of combined_ids) {
			const in_current = current_status_ids.includes(status_id);
			const in_new = new_status_ids.includes(status_id);

			if (in_current && !in_new) {
				const status_element = statuses_container.querySelector(`[notification_id="${status_id}"]`);
				status_element.outerHTML = "";
			} else if (!in_current && in_new) {
				const status_object = json.find(status => status.id === status_id);
				const new_element = create_notification_element_from_notification_object(status_object)
				statuses_container.appendChild(new_element);
			} else if (in_current && in_new) {
				const status_object = json.find(status => status.id === status_id);
				const current_element = statuses_container.querySelector(`[notification_id="${status_id}"]`);
				const new_element = create_notification_element_from_notification_object(status_object);
				current_element.replaceWith(new_element);
			}
		}
		
		new_status_ids.forEach((id, index) => {
			const el = document.querySelector(`[notification_id="${id}"]`);
			if (el) el.style.order = index;
		});


		for(const [id, old_rect] of first.entries()) {
			if(!old_rect) continue;

			const el = document.querySelector(`[notification_id="${id}"]`);
			if(!el) continue;

			const current_rect = el.getBoundingClientRect();
			const dy = old_rect.top - current_rect.top;

			el.style.transition = 'none';
			el.style.transform = `translate(0px, ${dy}px)`;

			requestAnimationFrame(() => {
				el.style.transition = 'transform 300ms ease';
				el.style.transform = '';
			});
		}
		// notification_els.forEach(el => {
		// 	const prev = first.get(el);
		// 	const next = el.getBoundingClientRect();
		//
		// 	const dx = prev.left - next.left;
		// 	const dy = prev.top - next.top;
		//
		// 	if (dx === 0 && dy === 0) return;
		//
		// 	el.style.transition = 'none';
		// 	el.style.transform = `translate(${dx}px, ${dy}px)`;
		//
		// });

		setTimeout(check_statuses, 500);
	}
	check_statuses();
}


export function enable() {
	begin_status_update_loop();
}



function alignElements(liveEl, templateEl) {
	// If node types differ, replace entirely
	if (liveEl.nodeType !== templateEl.nodeType) {
		liveEl.replaceWith(templateEl.cloneNode(true));
		return;
	}

	// If element tag names differ, replace
	if (liveEl.nodeType === Node.ELEMENT_NODE &&
		liveEl.tagName !== templateEl.tagName) {
		liveEl.replaceWith(templateEl.cloneNode(true));
		return;
	}

	// Text node
	if (liveEl.nodeType === Node.TEXT_NODE) {
		if (liveEl.textContent !== templateEl.textContent) {
			liveEl.textContent = templateEl.textContent;
		}
		return;
	}

	// Element node — sync attributes
	syncAttributes(liveEl, templateEl);

	// Sync children
	syncChildren(liveEl, templateEl);
}

function syncAttributes(liveEl, templateEl) {
	// Remove old attributes
	for (const attr of [...liveEl.attributes]) {
		if (!templateEl.hasAttribute(attr.name)) {
			liveEl.removeAttribute(attr.name);
		}
	}

	// Add / update attributes
	for (const attr of [...templateEl.attributes]) {
		if (liveEl.getAttribute(attr.name) !== attr.value) {
			liveEl.setAttribute(attr.name, attr.value);
		}
	}
}

function syncChildren(liveEl, templateEl) {
	const liveChildren = [...liveEl.childNodes];
	const templateChildren = [...templateEl.childNodes];

	const max = Math.max(liveChildren.length, templateChildren.length);

	for (let i = 0; i < max; i++) {
		const liveChild = liveChildren[i];
		const templateChild = templateChildren[i];

		if (!liveChild && templateChild) {
			liveEl.appendChild(templateChild.cloneNode(true));
			continue;
		}

		if (liveChild && !templateChild) {
			liveChild.remove();
			continue;
		}

		alignElements(liveChild, templateChild);
	}
}