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 ClientController from "../client-controller";
import Globals from "../globals";
import BaseElements from "./require/base-elements";
import IState from "./require/elements-state";
import ElementsUtil from "./require/elements-util";

import { $, $$, $$$, $$$$ } from './require/q-module';

export default function createCreateChannelOverlay(state: IState, server: ClientController): HTMLElement {
    const { document, ui } = state;
    $.setDocument(document);

    // See also overlay-modify-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: '' }
        ] },
        { class: 'text-input channel-name', placeholder: 'channel-name', content: '', contenteditable: 'plaintext-only' },
        { class: 'text-input channel-flavor-text', placeholder: 'Flavor Text (optional)', content: '' || '', contenteditable: 'plaintext-only' },
        { class: 'lower', content: [
            { class: 'error' },
            { class: 'buttons', content: [
                { class: 'button submit', content: 'Create Channel' }
            ] }
        ] }
    ] });

    let newName = '';
    let newFlavorText: string | null = '';
    function updatePreview() {
        newName = $$$(element, '.text-input.channel-name').innerText;
        newFlavorText = $$$(element, '.text-input.channel-flavor-text').innerText;
        $$$(element, '.channel-title .channel-name').innerText = newName;
        $$$(element, '.channel-title .channel-flavor-text').innerText = newFlavorText;

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

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

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

        let success = false;
        if (newName.length == 0) {
            LOG.warn('attempted to set empty channel name');
            $$$(element, '.error').innerText = 'Channel name cannot be empty';
            $$$(element, '.button.submit').innerText = 'Try Again';
            await ElementsUtil.shakeElement($$$(element, '.button.submit'), 400);
        } else if (newName.length > Globals.MAX_CHANNEL_NAME_LENGTH) {
            LOG.warn('attempted to set too long channel name');
            $$$(element, '.error').innerText = 'Channel name is too long. ' + newName.length + ' > ' + Globals.MAX_CHANNEL_NAME_LENGTH;
            $$$(element, '.button.submit').innerText = 'Try Again';
            await ElementsUtil.shakeElement($$$(element, '.button.submit'), 400);
        } else if (!(/^[A-Za-z0-9-]+$/.exec(newName))) {
            LOG.warn('attempted to set channel name with illegal characters');
            $$$(element, '.error').innerText = 'Please use only [A-Za-z0-9-]+ in channel name';
            $$$(element, '.button.submit').innerText = 'Try Again';
            await ElementsUtil.shakeElement($$$(element, '.button.submit'), 400);
        } else if (newFlavorText != null && newFlavorText.length > Globals.MAX_CHANNEL_FLAVOR_TEXT_LENGTH) {
            LOG.warn('attempted to set too long flavor text');
            $$$(element, '.error').innerText = 'Flavor text is too long. ' + newName.length + ' > ' + Globals.MAX_CHANNEL_NAME_LENGTH;
            $$$(element, '.button.submit').innerText = 'Try Again';
            await ElementsUtil.shakeElement($$$(element, '.button.submit'), 400);
        } else {
            if (newFlavorText != null && newFlavorText.length == 0) {
                newFlavorText = null;
            }
            try {
                await server.createChannel(newName, newFlavorText);
                success = true;
            } catch (e) {
                LOG.error('error updating channel', e);
                $$$(element, '.error').innerText = 'Error updating channel';
                $$$(element, '.button.submit').innerText = 'Try Again';
                await ElementsUtil.shakeElement($$$(element, '.button.submit'), 400);
            }
        }

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

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

        submitting = false;
    }

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

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

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

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

    return element;
}

module.exports = createCreateChannelOverlay;