import { format } from 'date-fns';
import { prop, computed, container } from 'frptools';

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

import { error } from '../services/console.js';
import { ImageType } from '../data/image.js';
import { pouchDocArrayHash, pouchDocHash, hashSet, extractID } from '../utils/conversion.js';
import { SectionView } from './sectionView.js';
import { Icon } from './components/icon.js';
import { GithubCorner } from './components/githubCorner.js';
import { AppBar } from './components/appbar.js';
import { Overlay } from './components/overlay.js';
import { injectStyle, styled } from '../services/style.js';
import { CLICKABLE } from './styles.js';

export function uploadImages(evt, files) {
	Array.from(files || evt.currentTarget.files).forEach(ImageType.upload);

	if (evt.currentTarget) {
		evt.currentTarget.value = null;
	}
}

export function AllImagesView(vm, params) {
	const model = prop({}, pouchDocHash);
	const images = container([], pouchDocArrayHash);
	const containerScrollTop = prop(0);

	const hover = prop(null);
	const hoverSelectButton = prop(null);
	const selectedIds = container(new Set(), hashSet);
	const selectMode = computed(sIds => sIds.size > 0, [selectedIds]);

	const appBarTitle = computed(s => (s.size > 0 ? `${s.size} selected` : 'Photos'), [selectedIds]);
	const appBarStyle = computed(
		t => ({
			width: 'inherit',
			marginRight: '40px',
			boxShadow: t === 0 ? 'none' : `0px 3px 3px rgba(0, 0, 0, .2)`
		}),
		[containerScrollTop]
	);
	const appBarUp = computed(s => (s ? { name: 'x', action: deSelect } : undefined), [selectMode]);
	const appBarActions = computed(
		s =>
			s
				? [
						trashButtonContainer(
							{
								onclick: deleteSelectedImages
							},
							[
								Icon({
									name: 'trash',
									size: 0.75
								})
							]
						)
				  ]
				: [
						uploadButton([
							el(
								'label',
								{
									for: 'uploadButton',
									style: CLICKABLE
								},
								[
									Icon({
										name: 'upload',
										size: 0.75,
										title: 'Upload'
									})
								]
							)
						]),
						el('input', {
							id: 'uploadButton',
							name: 'uploadButton',
							type: 'file',
							multiple: true,
							accept: '.jpg,.jpeg,.png,.gif',
							onchange: uploadImages,
							class: injectStyle({ display: 'none' })
						})
				  ],
		[selectMode]
	);

	const sections = computed(
		imageArr => {
			const sectionMap = imageArr.reduce((acc, i) => {
				const date = i.originalDate.substr(0, 10);
				return Object.assign(acc, { [date]: (acc[date] || []).concat(i) });
			}, {});
			return Object.entries(sectionMap)
				.sort((a, b) => a[0].localeCompare(b[0]))
				.map(([date, _images]) => ({
					title: format(date, 'MMMM D, YYYY'),
					sectionId: date,
					images: _images
				}));
		},
		[images]
	);

	function deSelect() {
		selectedIds.clear();
	}

	function deleteSelectedImages() {
		if (confirm(`Delete ${selectedIds.size} image(s)?`)) {
			selectedIds.forEach(ImageType.delete);
			selectedIds.clear();
		}
	}

	function photoClick(evt, node, vm) {
		if (selectMode()) {
			toggleSelect(evt, node, vm);
		}
	}

	function toggleSelect(evt, node, vm) {
		evt.preventDefault();

		const imageNode = nodeParentWithType(node, 'image');
		const id = imageNode.data._id;
		if (selectedIds.has(id)) {
			selectedIds.delete(id);
		} else {
			selectedIds.add(id);
		}
	}

	function toggleAll(evt, node, vm) {
		const sectionNode = nodeParentWithType(node, 'section');
		const { sectionImageIds } = sectionNode.data;
		const selected = sectionImageIds.filter(i => selectedIds.has(i));
		if (sectionImageIds.length === selected.length) {
			sectionImageIds.forEach(i => selectedIds.delete(i));
		} else {
			sectionImageIds.forEach(i => selectedIds.add(i));
		}
	}

	function handleContentScroll(evt) {
		containerScrollTop(evt.target.scrollTop);
	}

	ImageType.find(
		{
			['sizes.thumbnail']: { $exists: true }
		},
		{ live: true }
	).then(la => {
		subscribeToRender(vm, [
			selectedIds,
			images,
			selectMode,
			appBarStyle,
			hover,
			hoverSelectButton,
			() => la.subscribe(res => images.splice(0, images.length, ...res))
		]);
	});

	function renderSection({ title, sectionId, images: _images }) {
		return vw(
			SectionView,
			{
				title,
				photos: _images,
				selectedIds,
				selectMode: selectMode(),
				hover,
				hoverSelectButton
			},
			sectionId
		);
	}

	return function() {
		const _sections = sections();
		const hasPhotos = !!_sections.length;

		return allImagesContainer(
			{
				class: 'allImages'
			},
			[
				AppBar({
					style: appBarStyle(),
					title: appBarTitle(),
					actions: appBarActions(),
					up: appBarUp()
				}),
				allImagesContent(
					{
						onscroll: handleContentScroll,
						onclick: {
							'.photoSelect .icon svg path': toggleSelect,
							'.photoSelect .icon': toggleSelect,
							'.sectionSelectButton .icon': toggleAll,
							'.sectionSelectButton .icon svg path': toggleAll,
							'.photoOverlay': photoClick
						},
						style: { overflowY: hasPhotos ? 'scroll' : 'hidden' }
					},
					hasPhotos
						? _sections.map(renderSection)
						: [
								Overlay(
									{
										textAlign: 'center',
										padding: '5%'
									},
									[
										el('h1', 'Welcome'),
										el('p', [
											'To get started, drag some photos from your desktop or click on the ',
											el(
												'label',
												{
													for: 'uploadButton',
													style: Object.assign({ margin: '0px 3px' }, CLICKABLE)
												},
												[
													Icon({
														name: 'upload',
														size: 0.75,
														title: 'Upload',
														style: { verticalAlign: 'middle' }
													})
												]
											),
											'button.'
										])
									]
								)
						  ]
				),
				GithubCorner('https://github.com/explorigin/portfolio/tree/master/packages/gallery')
			]
		);
	};
}

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

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

const allImagesContainer = styled({
	display: 'flex',
	flexDirection: 'column',
	flex: 1
});
const allImagesContent = styled({
	flex: 1
});