import './sharePage.less';
import React, { useState, useEffect, useCallback } from 'react';
import Headtags   from '../../../../vitreum/headtags.js';
const Meta = Headtags.Meta;

import Nav from '@navbar/nav.jsx';
import Navbar from '@navbar/navbar.jsx';
import MetadataNav from '@navbar/metadata.navitem.jsx';
import PrintNavItem from '@navbar/print.navitem.jsx';
import RecentNavItems from '@navbar/recent.navitem.jsx';
const { both: RecentNavItem } = RecentNavItems;
import Account from '@navbar/account.navitem.jsx';
import BrewRenderer from '../../brewRenderer/brewRenderer.jsx';

import { DEFAULT_BREW_LOAD } from '../../../../server/brewDefaults.js';
import { printCurrentBrew, fetchThemeBundle } from '@shared/helpers.js';

const SharePage = (props)=>{
	const { disableMeta = false } = props;

	const [currentBrew, setCurrentBrew] = useState(props.brew || DEFAULT_BREW_LOAD);
	const [themeBundle,                setThemeBundle]                = useState({});
	const [currentBrewRendererPageNum, setCurrentBrewRendererPageNum] = useState(1);

	const handleBrewRendererPageChange = useCallback((pageNumber)=>{
		setCurrentBrewRendererPageNum(pageNumber);
	}, []);

	const handleControlKeys = (e)=>{
		if(!(e.ctrlKey || e.metaKey)) return;
		const P_KEY = 80;
		if(e.keyCode === P_KEY) {
			printCurrentBrew();
			e.stopPropagation();
			e.preventDefault();
		}
	};

	useEffect(()=>{
		document.addEventListener('keydown', handleControlKeys);
		fetchThemeBundle(undefined, setThemeBundle, currentBrew.renderer, currentBrew.theme);

        // listen for changes in the brew version
		const eventSource = new EventSource('/stream');
		eventSource.addEventListener('message', (evt)=>{
			const messageData = JSON.parse(evt.data);

			if(messageData.eventType == 'brewUpdated'){
				if(messageData.shareId == currentBrew.shareId && messageData.version != currentBrew.version) {
					console.log(`brew has been updated, viewing ${currentBrew.version}, new version is ${messageData.version}`);
					console.log('should fetch brew');
				}
			}
		});

		return ()=>{
			document.removeEventListener('keydown', handleControlKeys);
		};
	}, []);

	const processShareId = ()=>{
		return currentBrew.googleId && !currentBrew.stubbed ? currentBrew.googleId + currentBrew.shareId : currentBrew.shareId;
	};

	const renderEditLink = ()=>{
		if(!currentBrew.editId) return null;

		const editLink = currentBrew.googleId && ! currentBrew.stubbed ? currentBrew.googleId + currentBrew.editId : currentBrew.editId;

		return (
			<Nav.item color='orange' icon='fas fa-pencil-alt' href={`/edit/${editLink}`}>
				edit
			</Nav.item>
		);
	};

	const titleEl = (
		<Nav.item className='brewTitle' style={disableMeta ? { cursor: 'default' } : {}}>
			{currentBrew.title}
		</Nav.item>
	);

	return (
		<div className='sharePage sitePage'>
			<Meta name='robots' content='noindex, nofollow' />
			<Navbar>
				<Nav.section className='titleSection'>
					{disableMeta ? titleEl : <MetadataNav brew={currentBrew}>{titleEl}</MetadataNav>}
				</Nav.section>

				<Nav.section>
					{currentBrew.shareId && (
						<>
							<PrintNavItem />
							<Nav.dropdown>
								<Nav.item color='red' icon='fas fa-code'>
									source
								</Nav.item>
								<Nav.item color='blue' icon='fas fa-eye' href={`/source/${processShareId()}`}>
									view
								</Nav.item>
								{renderEditLink()}
								<Nav.item color='blue' icon='fas fa-download' href={`/download/${processShareId()}`}>
									download
								</Nav.item>
								<Nav.item color='blue' icon='fas fa-clone' href={`/new/${processShareId()}`}>
									clone to new
								</Nav.item>
								<Nav.item
									color='blue'
									icon='fas fa-link'
									onClick={()=>{navigator.clipboard.writeText(`${global.config.baseUrl}/share/${processShareId()}`);}}>
									copy url
								</Nav.item>
								{currentBrewRendererPageNum > 1 &&
									<Nav.item
										color='blue'
										icon='fas fa-hashtag'
										onClick={()=>{navigator.clipboard.writeText(`${global.config.baseUrl}/share/${processShareId()}#p${currentBrewRendererPageNum}`);}}>
										copy url (page {currentBrewRendererPageNum})
									</Nav.item>}
							</Nav.dropdown>
						</>
					)}
					<RecentNavItem brew={currentBrew} storageKey='view' />
					<Account />
				</Nav.section>
			</Navbar>

			<div className='content'>
				<BrewRenderer
					text={currentBrew.text}
					style={currentBrew.style}
					lang={currentBrew.lang}
					renderer={currentBrew.renderer}
					theme={currentBrew.theme}
					themeBundle={themeBundle}
					onPageChange={handleBrewRendererPageChange}
					currentBrewRendererPageNum={currentBrewRendererPageNum}
					allowPrint={true}
				/>
			</div>
		</div>
	);
};

export default SharePage;