import { prop, computed, container } from 'frptools';

import {
	subscribeToRender,
	defineView,
	nodeParentWithType,
	fullViewportSize,
	defineElement as el,
	injectView as iv
} from '../utils/domvm.js';

import { router } from '../services/router.js';
import { ImageType } from '../data/image.js';
import { pouchDocHash, pick } from '../utils/conversion.js';
import { AttachmentImageView } from './components/attachmentImage.js';
import { Overlay } from './components/overlay.js';
import { Icon } from './components/icon.js';
import { AppBar } from './components/appbar.js';
import { styled, injectStyle } from '../services/style.js';
import { error } from '../utils/console.js';
import { CLICKABLE, FILL_STYLE } from './styles.js';

export function FocusView(vm, params) {
	const id = prop();
	const doc = prop({}, pouchDocHash);
	const nextLink = prop();
	const prevLink = prop();
	const mouseActive = prop(true);
	let mouseMoveTimeout = null;

	const appBarStyle = computed(
		mA => ({
			position: 'fixed',
			opacity: mA ? 1 : 0,
			backgroundImage: 'linear-gradient(0deg,rgba(0,0,0,0),rgba(0,0,0,0.4))'
		}),
		[mouseActive],
		s => s.opacity
	);
	const imageStyle = computed(
		({ width: iw, height: ih }, { width: vw, height: vh }) => {
			const imageRatio = iw / ih;
			const windowRatio = vw / vh;
			if (iw < vw && ih < vh) {
				return {
					height: ih,
					width: iw
				};
			}
			if (windowRatio > imageRatio) {
				return {
					height: vw / windowRatio,
					width: vw / windowRatio * imageRatio
				};
			}
			return {
				height: vh * windowRatio / imageRatio,
				width: vh * windowRatio
			};
		},
		[doc, fullViewportSize]
	);

	function navBack() {
		router.goto('home');
	}

	async function clickTrash() {
		if (confirm('Delete this image?')) {
			await ImageType.delete(id());
			navBack();
		}
	}

	const mouseLeave = () => {
		mouseActive(false);
	};

	const mouseMove = () => {
		if (mouseMoveTimeout !== null) {
			clearTimeout(mouseMoveTimeout);
		}
		mouseMoveTimeout = setTimeout(mouseLeave, 3000);
		mouseActive(true);
	};

	const mouseClick = () => {
		if (mouseMoveTimeout !== null) {
			clearTimeout(mouseMoveTimeout);
		}
		mouseActive(!mouseActive());
	};

	// Subscribe to our changables.
	subscribeToRender(
		vm,
		[
			doc,
			nextLink,
			prevLink,
			appBarStyle,
			// Look for our image and set it.
			() =>
				id.subscribe(async _id => {
					if (!_id) {
						return;
					}
					doc(await ImageType.find(_id));

					const n = await ImageType.find(
						{
							originalDate: { $gte: doc().originalDate }
						},
						{
							limit: 1,
							skip: 1,
							index: 'originalDate',
							sort: [{ originalDate: 'asc' }]
						}
					);

					const p = await ImageType.find(
						{
							originalDate: { $lte: doc().originalDate }
						},
						{
							limit: 1,
							skip: 1,
							index: 'originalDate',
							sort: [{ originalDate: 'desc' }]
						}
					);

					nextLink(n.length ? router.href('focus', { id: n[0]._id }) : null);
					prevLink(p.length ? router.href('focus', { id: p[0]._id }) : null);
				})
		],
		true
	);

	// Watch for focus changes
	vm.config({ hooks: { willUpdate: (vm, { vars }) => id(vars.id) } });

	// Start navigation
	id(params.vars.id);
	mouseMove();

	return function() {
		const _id = doc() && doc()._id;

		if (!_id) {
			return Overlay('Loading...');
		}

		return focusContainer(
			{
				class: 'focus',
				onmousemove: mouseMove,
				onmouseleave: mouseLeave,
				onclick: mouseClick
			},
			[
				AppBar({
					style: appBarStyle(),
					title: '',
					up: { action: navBack, fill: 'white' },
					actions: [
						trashButtonContainer(
							{
								onclick: clickTrash
							},
							[
								Icon({
									name: 'trash',
									size: 0.75,
									fill: 'white',
									style: { verticalAlign: 'middle' }
								})
							]
						)
					]
				}),
				focusContent([
					prevLink()
						? prevClickZone({ href: prevLink() }, [
								Icon({
									name: 'chevron_left',
									size: 0.75,
									fill: 'white'
								})
						  ])
						: null,
					AttachmentImageView({
						src: _id ? doc().sizes.full : null,
						style: imageStyle
					}),
					nextLink()
						? nextClickZone({ href: nextLink() }, [
								Icon({
									name: 'chevron_right',
									size: 0.75,
									fill: 'white'
								})
						  ])
						: null
				])
			]
		);
	};
}

const WIDE = injectStyle({ width: '100%' });
const TALL = injectStyle({ height: '100%' });
const CSS_CLICK_ZONE = {
	position: 'absolute',
	width: '33%',
	height: '70%',
	display: 'flex',
	alignItems: 'center',
	padding: '2em',
	top: '15%',
	transition: 'opacity .13s cubic-bezier(0.0,0.0,0.2,1)',
	opacity: 0,
	cursor: 'pointer',
	':hover': {
		opacity: 1
	}
};

const trashButtonContainer = styled(
	{
		marginRight: '1em'
	},
	CLICKABLE
);

const focusContainer = styled(
	{
		display: 'flex',
		overflow: 'hidden',
		flexDirection: 'column',
		alignItems: 'center',
		backgroundColor: 'black'
	},
	FILL_STYLE
);

const focusContent = styled({
	flex: 1,
	overflow: 'hidden',
	display: 'flex',
	flexDirection: 'column',
	justifyContent: 'center'
});

const nextClickZone = styled(
	'a',
	{
		right: '0px',
		justifyContent: 'flex-end'
	},
	CSS_CLICK_ZONE
);

const prevClickZone = styled(
	'a',
	{
		left: '0px',
		justifyContent: 'flex-start'
	},
	CSS_CLICK_ZONE
);