var socket;

function load() {
	socket = init_websocket();

	Object.entries(init_state).forEach(([device_id, sub_devs]) => {
		let device = document.querySelector('#' + device_id);
		Object.entries(sub_devs).forEach(([sub_device_id, state]) => {
			let sub_dev = device.querySelector('.' + sub_device_id);
			let svg = sub_dev.querySelector('object').getSVGDocument().firstElementChild;
			if (state) {
				svg.classList.remove('off');
				svg.classList.add('on');
			}
		});
	});

	document.querySelectorAll('input[type=color]').forEach((led_input) => {
		led_input.onchange = function(event) {
			event.target.parentElement.style.backgroundColor = event.target.value;
		}
	});
}

/* Websocket setup */
function init_websocket() {
	let socket = new WebSocket('wss://' + window.location.hostname + ws_uri);
	socket._send = socket.send;
	socket.send = function(event_title, data) {
		data = JSON.stringify({event: event_title, data: data});
		if (socket.readyState == 0) {
			console.log("Socket is still opening!");
			return;
		}
		socket._send(data);
	}
	socket.onmessage = onmessage;
	socket.onclose = onclose;
	socket.onerror = onerror;
	socket.events = {};
	socket.events['toggle_outlet'] = toggle_outlet_recv;
	socket.events['edit_field'] = edit_field_recv;
	socket.events['new_device'] = new_device_recv;
	socket.events['lock_device'] = lock_device_recv;
	socket.events['delete_device'] = delete_device_recv;
	return socket;
}

function onmessage (e) {
	let data = JSON.parse(e.data);
	let event = data.event;
	data = data.data;
	if (!data.ok) {
		throw new Error("Socket error: event = " + event +", error = " + data.error);
	}
	if (socket.events[event] === undefined) {
		console.log("Unknown socket event: " + event);
		return;
	}
	socket.events[event](data);
}

function onclose(e) {
	if (e.wasClean) { return; } // no need to reconnect
	console.log(e);
	console.log('Websocket lost connection to server. Re-trying...');
	socket = init_websocket();
}

function onerror(e) {
	console.log("Websocket error!")
	console.log(e);
}

/* Websocket receive */
function toggle_outlet_recv(data) {
	let device = document.querySelector('#' + data.device_id);
	let sub_device = device.querySelector('.' + data.sub_device_id);
	let svg = sub_device.querySelector('.outlet_image').getSVGDocument().firstChild;
	if (data.state === true) {
		svg.classList.remove('off');
		svg.classList.add('on');
	} else {
		svg.classList.remove('on');
		svg.classList.add('off');
	}
}

function edit_field_recv(data) {
	let device = document.querySelector('#' + data.device_id);
	if (data.sub_device_id) {
		device = device.querySelector('.' + data.sub_device_id);
	}
	let field = device.querySelector('.' + data.field);

	let span = document.createElement('span');
	span.innerText = data['value'];
	span.className = 'field_value';
	field.firstElementChild.replaceWith(span);

	let edit = document.createElement('span');
	edit.innerHTML = '';
	edit.className = 'edit font-awesome';
	edit.setAttribute('onclick', 'edit_field(this.parentElement)');
	field.children[1].replaceWith(edit);
}

function new_device_recv(data) {
	if (data.device_type == 'RelayDevice') {
		var template = document.querySelector('#RelayDevice_template');
	} else {
		return;
	}
	let node = document.importNode(template.content, true);
	node.querySelector('.id').querySelector('.field_value').textContent = data.device_id;
	document.querySelector('#devices').appendChild(node);
	let children = document.querySelector('#devices').children;
	children[children.length - 1].id = data.device_id;
}

function lock_device_recv(data) {
	let device = document.querySelector('#' + data.device_id);
	let fields = device.querySelectorAll('.editable');

	if (data.locked) {
		fields.forEach(function(field) {
			field.querySelector('.edit').remove();
		});
		device.querySelector('.id').querySelector('.lock').remove();
		device.querySelector('.id').querySelector('.delete').remove();
		let unlock = document.createElement('span');
		unlock.innerHTML = '';
		unlock.className = 'unlock font-awesome';
		unlock.setAttribute('onclick', 'unlock_device(this.parentElement.parentElement)');
		device.querySelector('.id').appendChild(unlock);
	} else {
		fields.forEach(function(field) {
			let edit = document.createElement('span');
			edit.innerHTML = '';
			edit.className = 'edit font-awesome';
			edit.setAttribute('onclick', 'edit_field(this.parentElement)');
			field.appendChild(edit);
		});
		device.querySelector('.id').querySelector('.unlock').remove();

		let delete_elem = document.createElement('span');
		delete_elem.innerHTML = '';
		delete_elem.className = 'delete font-awesome';
		delete_elem.setAttribute('onclick', 'delete_device(this.parentElement.parentElement)');
		device.querySelector('.id').appendChild(delete_elem);

		let lock = document.createElement('span');
		lock.innerHTML = '';
		lock.className = 'lock font-awesome';
		lock.setAttribute('onclick', 'lock_device(this.parentElement.parentElement)');
		device.querySelector('.id').appendChild(lock);
	}
}

function delete_device_recv(data) {
	let device = document.querySelector('#' + data.device_id);
	device.remove()
}

/* Websocket send */
function toggle_outlet(svg) {
	let sub_dev = get_object_from_svg(svg).parentElement;
	let data = {
		device_id: sub_dev.parentElement.parentElement.id,
		sub_device_id: sub_dev.querySelector('.id').innerText,
	};
	socket.send('toggle_outlet', data);
}

function save_field(field) {
	let value = field.firstElementChild.value;
	let device_id = field.parentElement.id;
	let sub_device_id;
	if (field.parentElement.className.includes('sub_device')) {
		sub_device_id = field.parentElement.children[0].textContent;
		device_id = field.parentElement.parentElement.parentElement.id;
	} else {
		sub_device_id = '';
	}
	let data = {
		device_id: device_id,
		sub_device_id: sub_device_id,
		field: field.classList[0],
		value: value
	};
	socket.send('edit_field', data);
}

function new_device() {
	let data = {
		device_type: 'RelayDevice',
	};
	socket.send('new_device', data);
}

function lock_device(device) {
	if (device.querySelector('.save')) { return; }
	let data = {
		device_id: device.id,
		locked: true,
	};
	socket.send('lock_device', data);
}

function unlock_device(device) {
	let data = {
		device_id: device.id,
		locked: false,
	};
	socket.send('lock_device', data);
}

function delete_device(device) {
	if (!window.confirm("Are you sure you want to delete this device?")) { return; }
	let data = {
		device_id: device.id,
	};
	socket.send('delete_device', data);
}

/* DOM */
function edit_field(field) {
	let value = field.firstElementChild.innerText;
	let input = document.createElement('input');
	input.value = value;
	field.firstElementChild.replaceWith(input);

	let save = document.createElement('span');
	save.innerHTML = '';
	save.className = 'save font-awesome';
	save.setAttribute('onclick', 'save_field(this.parentElement)');
	field.children[1].replaceWith(save);
}

/* Misc */
function get_object_from_svg(svg) {
	let all_objects = document.getElementsByTagName("object");
	for (let i=0; i < all_objects.length; i++) {
		if (svg === all_objects[i].getSVGDocument().firstElementChild) {
			return all_objects[i];
		}
	}
	return null;
}