/* eslint-disable max-lines */
import './editPage.less';

// Common imports
import React, { useState, useEffect, useRef, useEffectEvent } from 'react';
import request                                from '../../utils/request-middleware.js';
import { hbfm } from 'hbmarkedwrapper';
import _                                      from 'lodash';

import { DEFAULT_BREW_LOAD }                  from '../../../../server/brewDefaults.js';

import useCommonEditPageFunctions from '../../utils/commonEditPageFunctions.js'

import SplitPane    from '@components/splitPane/splitPane.jsx';
import Editor       from '../../editor/editor.jsx';
import BrewRenderer from '../../brewRenderer/brewRenderer.jsx';

import Nav            from '@navbar/nav.jsx';
import Navbar         from '@navbar/navbar.jsx';
import NewBrewItem    from '@navbar/newbrew.navitem.jsx';
import AccountNavItem from '@navbar/account.navitem.jsx';
import ErrorNavItem   from '@navbar/error-navitem.jsx';
import HelpNavItem    from '@navbar/help.navitem.jsx';
import VaultNavItem   from '@navbar/vault.navitem.jsx';
import PrintNavItem   from '@navbar/print.navitem.jsx';
import RecentNavItems from '@navbar/recent.navitem.jsx';
const { both: RecentNavItem } = RecentNavItems;

// Page specific imports
import Headtags from '../../../../vitreum/headtags.js';
const Meta = Headtags.Meta;
import { md5 }                           from 'hash-wasm';
import { gzipSync, strToU8 }             from 'fflate';
import { makePatches, stringifyPatches } from '@sanity/diff-match-patch';

import ShareNavItem              from '@navbar/share.navitem.jsx';
import LockNotification from './lockNotification/lockNotification.jsx';
import { updateHistory, versionHistoryGarbageCollection } from '../../utils/versionHistory.js';
import googleDriveIcon from '../../googleDrive.svg';

const BREWKEY  = 'HB_newPage_content';
const STYLEKEY = 'HB_newPage_style';
const SNIPKEY  = 'HB_newPage_snippets';
const METAKEY  = 'HB_newPage_meta';

const useLocalStorage = false;
const sandbox	        = false;

const EditPage = (props)=>{
	props = {
		brew : DEFAULT_BREW_LOAD,
		...props
	};

	const [currentBrew, setCurrentBrew] = useState(props.brew);
	const [saveGoogle, setSaveGoogle] = useState(!!props.brew.googleId);
	const [error, setError] = useState(null);
	const [HTMLErrors, setHTMLErrors] = useState(hbfm.validate(props.brew.text));
	const [currentEditorViewPageNum, setCurrentEditorViewPageNum] = useState(1);
	const [currentEditorCursorPageNum, setCurrentEditorCursorPageNum] = useState(1);
	const [currentBrewRendererPageNum, setCurrentBrewRendererPageNum] = useState(1);
	const [themeBundle, setThemeBundle] = useState({});
	const [alertTrashedGoogleBrew, setAlertTrashedGoogleBrew] = useState(props.brew.trashed);
	const [alertNoGoogleToTransfer, setAlertNoGoogleToTransfer] = useState(false);
	const [alertOwnershipToTransfer, setAlertOwnershipToTransfer] = useState(false);
	const [confirmGoogleTransfer, setConfirmGoogleTransfer] = useState(false);

	const editorRef     = useRef(null);
	const lastSavedBrew = useRef(_.cloneDeep(props.brew));

	const updateBrew = (newData)=>setCurrentBrew((prevBrew)=>({
		...prevBrew,
		style    : newData.style,
		text     : newData.text,
		snippets : newData.snippets
	}));

	const handleGoogleClick = ()=>{
		if(currentBrew.authors.length > 0 && global.account?.username !== currentBrew.authors[0]) {
			setAlertOwnershipToTransfer(true);
			return;
		}
		if(!global.account?.googleId) {
			setAlertNoGoogleToTransfer(true);
			return;
		}

		setConfirmGoogleTransfer((prev)=>!prev);
		setError(null);
	};

	const closeAlerts = (e)=>{
		e.stopPropagation(); //Only handle click once so alert doesn't reopen
		setAlertTrashedGoogleBrew(false);
		setAlertNoGoogleToTransfer(false);
		setConfirmGoogleTransfer(false);
		setAlertOwnershipToTransfer(false);
	};

	const toggleGoogleStorage = (e)=>{
		closeAlerts(e);
		const newSaveGoogle = !saveGoogle;
		setSaveGoogle((prev)=>!prev);
		setError(null);
		trySave(true, true, newSaveGoogle);
	};

	const save = async (brew, saveToGoogle)=>{
		setHTMLErrors(hbfm.validate(brew.text));

		await updateHistory(brew).catch(console.error);
		await versionHistoryGarbageCollection().catch(console.error);

		//Prepare content to send to server
		const brewToSave = {
			...brew,
			text      : brew.text.normalize('NFC'),
			pageCount : ((brew.renderer === 'legacy' ? brew.text.match(/\\page/g) : brew.text.match(/^(?=\\page(?:break)?(?: *{[^\n{}]*})?$)/gm)) || []).length + 1,
			patches   : stringifyPatches(makePatches(encodeURI(lastSavedBrew.current.text.normalize('NFC')), encodeURI(brew.text.normalize('NFC')))),
			hash      : await md5(lastSavedBrew.current.text.normalize('NFC')),
			textBin   : undefined,
			version   : lastSavedBrew.current.version
		};

		const compressedBrew = gzipSync(strToU8(JSON.stringify(brewToSave)));
		const transfer = saveToGoogle === _.isNil(brew.googleId);
		const params = transfer ? `?${saveToGoogle ? 'saveToGoogle' : 'removeFromGoogle'}=true` : '';

		const res = await request
			.put(`/api/update/${brewToSave.editId}${params}`)
			.set('Content-Encoding', 'gzip')
			.set('Content-Type', 'application/json')
			.send(compressedBrew)
			.catch((err)=>{
				console.error('Error Updating Local Brew');
				setError(err);
			});
		if(!res) return;

		const updatedFields = {
			googleId : res.body.googleId ?? null,
			editId   : res.body.editId,
			shareId  : res.body.shareId,
			version  : res.body.version
		};

		lastSavedBrew.current = {
			...brew,
			...updatedFields
		};

		setCurrentBrew((prevBrew)=>({
			...prevBrew,
			...updatedFields
		}));

		history.replaceState(null, null, `/edit/${res.body.editId}`);
	};

	const renderGoogleDriveIcon = ()=>(
		<Nav.item className='googleDriveStorage' onClick={handleGoogleClick}>
			<img src={googleDriveIcon} className={saveGoogle ? '' : 'inactive'} alt='Google Drive icon' />

			{alertOwnershipToTransfer && (
				<div className='errorContainer'>
					You must be the Owner to transfer between the Homebrewery and Google Drive! 
					The owner of this file is {currentBrew.authors[0]}.
					<br></br>
					<div className='confirm' onClick={closeAlerts}> Okay </div>
				</div>
			)}

			{alertNoGoogleToTransfer && (
				<div className='errorContainer'>
					You must be signed in to a Google account to transfer between the Homebrewery and Google Drive!
					<a target='_blank' rel='noopener noreferrer' href={`https://www.naturalcrit.com/login?redirect=${window.location.href}`}>
						<div className='confirm' onClick={closeAlerts}> Sign In </div>
					</a>
					<div className='deny'  onClick={closeAlerts}>      Not Now </div>
				</div>
			)}

			{alertTrashedGoogleBrew && (
				<div className='errorContainer'>
					This brew is currently in your Trash folder on Google Drive!<br />
					If you want to keep it, make sure to move it before it is deleted permanently!<br />
					<div className='confirm' onClick={toggleGoogleStorage}> Save my brew </div>
				</div>
			)}

			{confirmGoogleTransfer && (
				<div className='errorContainer'>
					{saveGoogle
						? 'Would you like to transfer this brew from your Google Drive storage back to the Homebrewery?'
						: 'Would you like to transfer this brew from the Homebrewery to your personal Google Drive storage?'}
					<br />
					<div className='confirm' onClick={toggleGoogleStorage}> Yes </div>
					<div className='deny' onClick={closeAlerts}>                                  No  </div>
				</div>
			)}
		</Nav.item>
	);

	const renderAutoSaveButton = ()=>(
		<Nav.item onClick={toggleAutoSave}>
			Autosave <i className={autoSaveEnabled ? 'fas fa-power-off active' : 'fas fa-power-off'}></i>
		</Nav.item>
	);

	const renderNavbar = ()=>{
		return <Navbar>
			<Nav.section>
				<Nav.item className='brewTitle'>{currentBrew.title}</Nav.item>
			</Nav.section>

			<Nav.section>
				{renderGoogleDriveIcon()}
				{error
					? <ErrorNavItem error={error} clearError={clearError} />
					: <Nav.dropdown className='save-menu'>
						{renderSaveButton()}
						{renderAutoSaveButton()}
					</Nav.dropdown>}
				<NewBrewItem />
				<PrintNavItem />
				<HelpNavItem />
				<VaultNavItem />
				<ShareNavItem brew={currentBrew} currentPage={currentBrewRendererPageNum} />
				<RecentNavItem brew={currentBrew} storageKey='edit' />
				<AccountNavItem/>
			</Nav.section>
		</Navbar>;
	};

	const {
		handleSplitMove,
		handleBrewChange,
		toggleAutoSave,
		clearError,
		renderSaveButton,
		autoSaveEnabled,
		trySave
	} = useCommonEditPageFunctions({
		saveGoogle,
		setError,
		setThemeBundle,
		HTMLErrors,
		setHTMLErrors,
		currentBrew,
		setCurrentBrew,
		useLocalStorage,
		BREWKEY,
		STYLEKEY,
		SNIPKEY,
		METAKEY,
		hbfm,
		sandbox,
		lastSavedBrew,
		editorRef,
		save,
	});

	return (
		<div className='editPage sitePage'>
			<Meta name='robots' content='noindex, nofollow' />

			{renderNavbar()}

			{currentBrew.lock && <LockNotification shareId={currentBrew.shareId} message={currentBrew.lock.editMessage} reviewRequested={currentBrew.lock.reviewRequested}/>}

			<div className='content'>
				<SplitPane onDragFinish={handleSplitMove}>
					<Editor
						ref={editorRef}
						brew={currentBrew}
						onBrewChange={handleBrewChange}
						reportError={setError}
						renderer={currentBrew.renderer}
						userThemes={props.userThemes}
						themeBundle={themeBundle}
						updateBrew={updateBrew}
						onCursorPageChange={setCurrentEditorCursorPageNum}
						onViewPageChange={setCurrentEditorViewPageNum}
						currentEditorViewPageNum={currentEditorViewPageNum}
						currentEditorCursorPageNum={currentEditorCursorPageNum}
						currentBrewRendererPageNum={currentBrewRendererPageNum}
					/>
					<BrewRenderer
						text={currentBrew.text}
						style={currentBrew.style}
						renderer={currentBrew.renderer}
						theme={currentBrew.theme}
						themeBundle={themeBundle}
						errors={HTMLErrors}
						lang={currentBrew.lang}
						onPageChange={setCurrentBrewRendererPageNum}
						currentEditorViewPageNum={currentEditorViewPageNum}
						currentEditorCursorPageNum={currentEditorCursorPageNum}
						currentBrewRendererPageNum={currentBrewRendererPageNum}
						allowPrint={true}
					/>
				</SplitPane>
			</div>
		</div>
	);
};

export default EditPage;