import * as electronRemote from '@electron/remote';
const electronConsole = electronRemote.getGlobal('console') as Console;
import Logger from '../../../logger/logger';
const LOG = Logger.create(__filename, electronConsole);

import { Channel } from '../data-types';
import ClientController from '../client-controller.js';
import Globals from '../globals.js';

import BaseElements from './require/base-elements.js';
import ElementsUtil from './require/elements-util.js';
import Q from '../q-module';

export default function createModifyChannelOverlay(document: Document, q: Q, server: ClientController, channel: Channel): HTMLElement {
	// See also overlay-create-channel

	let element = BaseElements.createOverlay(document, { class: 'content submit-dialog modify-channel', content: [
		{ class: 'preview channel-title', content: [
			{ class: 'channel-icon', content: BaseElements.TEXT_CHANNEL_ICON },
			{ class: 'channel-name', content: channel.name },
			{ class: 'channel-flavor-divider' },
			{ class: 'channel-flavor-text', content: channel.flavorText || '' }
		] },
		{ class: 'text-input channel-name', placeholder: 'channel-name', content: channel.name, contenteditable: 'plaintext-only' },
		{ class: 'text-input channel-flavor-text', placeholder: 'Flavor Text (optional)', content: channel.flavorText || '', contenteditable: 'plaintext-only' },
		{ class: 'lower', content: [
			{ class: 'error' },
			{ class: 'buttons', content: [
				{ class: 'button submit', content: 'Save Changes' }
			] }
		] }
	] });

	let newName = channel.name;
	let newFlavorText = channel.flavorText;
	function updatePreview() {
		newName = q.$$$(element, '.text-input.channel-name').innerText;
		newFlavorText = q.$$$(element, '.text-input.channel-flavor-text').innerText;
		q.$$$(element, '.channel-title .channel-name').innerText = newName;
		q.$$$(element, '.channel-title .channel-flavor-text').innerText = newFlavorText;

		if (newFlavorText != '') {
			q.$$$(element, '.channel-title .channel-flavor-divider').style.visibility = 'visible';
		} else {
			q.$$$(element, '.channel-title .channel-flavor-divider').style.visibility = 'hidden';
		}
	}
	updatePreview();

	let submitting = false;
	async function submit() {
		if (submitting) return;
		submitting = true;

		q.$$$(element, '.error').innerText = '';
		q.$$$(element, '.button.submit').innerText = 'Submitting...';
		q.$$$(element, '.text-input.channel-name').removeAttribute('contenteditable');
		q.$$$(element, '.text-input.channel-flavor-text').removeAttribute('contenteditable');

		let success = false;
		if (newName == channel.name && (newFlavorText || '') == (channel.flavorText || '')) {
			success = true; // nothing changed
		} else if (newName.length == 0) {
			LOG.warn('attempted to set empty channel name');
			q.$$$(element, '.error').innerText = 'Channel name cannot be empty';
			q.$$$(element, '.button.submit').innerText = 'Try Again';
			await ElementsUtil.shakeElement(q.$$$(element, '.button.submit'), 400);
		} else if (newName.length > Globals.MAX_CHANNEL_NAME_LENGTH) {
			LOG.warn('attempted to set too long channel name');
			q.$$$(element, '.error').innerText = 'Channel name is too long. ' + newName.length + ' > ' + Globals.MAX_CHANNEL_NAME_LENGTH;
			q.$$$(element, '.button.submit').innerText = 'Try Again';
			await ElementsUtil.shakeElement(q.$$$(element, '.button.submit'), 400);
		} else if (!(/^[A-Za-z0-9-]+$/.exec(newName))) {
			LOG.warn('attempted to set channel name with illegal characters');
			q.$$$(element, '.error').innerText = 'Please use only [A-Za-z0-9-]+ in channel name';
			q.$$$(element, '.button.submit').innerText = 'Try Again';
			await ElementsUtil.shakeElement(q.$$$(element, '.button.submit'), 400);
		} else if (newFlavorText != null && newFlavorText.length > Globals.MAX_CHANNEL_FLAVOR_TEXT_LENGTH) {
			LOG.warn('attempted to set too long flavor text');
			q.$$$(element, '.error').innerText = 'Flavor text is too long. ' + newName.length + ' > ' + Globals.MAX_CHANNEL_NAME_LENGTH;
			q.$$$(element, '.button.submit').innerText = 'Try Again';
			await ElementsUtil.shakeElement(q.$$$(element, '.button.submit'), 400);
		} else {
			if (newFlavorText != null && newFlavorText.length == 0) {
				newFlavorText = null;
			}
			try {
				await server.updateChannel(channel.id, newName, newFlavorText);
				success = true;
			} catch (e) {
				LOG.error('error updating channel', e);
				q.$$$(element, '.error').innerText = 'Error updating channel';
				q.$$$(element, '.button.submit').innerText = 'Try Again';
				await ElementsUtil.shakeElement(q.$$$(element, '.button.submit'), 400);
			}
		}

		if (success) {
			element.removeSelf();
		}

		q.$$$(element, '.text-input.channel-name').setAttribute('contenteditable', 'plaintext-only');
		q.$$$(element, '.text-input.channel-flavor-text').setAttribute('contenteditable', 'plaintext-only');

		submitting = false;
	}

	let textInputs = q.$$$$(element, '.text-input');
	for (let textInput of textInputs) {
		textInput.addEventListener('input', () => {
			updatePreview();
		});
	}

	q.$$$(element, '.text-input.channel-name').addEventListener('keydown', async (e) => {
		if (e.key == 'Backspace' || e.key == 'Escape' || e.key == 'F4') {
			// these keys are good
		} else if (e.key == 'Tab') {
			// have to hard-code this one because otherwise, it just picks the beginning of the next input
			e.preventDefault();
			e.stopPropagation();
			q.$$$(element, '.text-input.channel-flavor-text').focus();
			ElementsUtil.setCursorToEnd(q.$$$(element, '.text-input.channel-flavor-text'));
		} else if (e.key == 'Enter') {
			e.preventDefault();
			e.stopPropagation();
			await submit();
		} else if (!/^[A-Za-z0-9-]$/.exec(e.key)) {
			e.preventDefault();
			e.stopPropagation();
		}
	});

	q.$$$(element, '.text-input.channel-flavor-text').addEventListener('keydown', async (e) => {
		if (e.key == 'Tab' && e.shiftKey) {
			// have to hard-code this one because otherwise, it just picks the beginning of the next input
			e.preventDefault();
			e.stopPropagation();
			q.$$$(element, '.text-input.channel-name').focus();
			ElementsUtil.setCursorToEnd(q.$$$(element, '.text-input.channel-name'));
		} else if (e.key == 'Enter') {
			e.preventDefault();
			e.stopPropagation();
			await submit();
		}
	});

	q.$$$(element, '.button.submit').addEventListener('click', async () => {
		await submit();
	});

	return element;
}