import { Link } from '../MdToHtml';
import { toForwardSlashes } from '@joplin/utils/path';
import { LinkIndexes } from './rules/link_close';
import { RendererTheme } from '../types';
import { AllHtmlEntities as Entities } from 'html-entities';
const htmlentities = new Entities().encode;

export interface Options {
	audioPlayerEnabled: boolean;
	videoPlayerEnabled: boolean;
	autoplayVideo?: boolean;
	pdfViewerEnabled: boolean;
	useCustomPdfViewer: boolean;
	noteId: string;
	vendorDir: string;
	theme: RendererTheme;
}

function resourceUrl(resourceFullPath: string): string {
	if (
		resourceFullPath.indexOf('http://') === 0 || resourceFullPath.indexOf('https://') === 0 || resourceFullPath.indexOf('joplin-content://') === 0 ||
		resourceFullPath.indexOf('file://') === 0 ||
		// On web, resources are loaded as blob URLs.
		resourceFullPath.startsWith('blob:null/')
	) {
		return resourceFullPath;
	}
	return `file://${toForwardSlashes(resourceFullPath)}`;
}

const resourceHash = (link: string) => {
	// Preserve certain #hash strings when rendering resources.
	// These patterns can be used to customize the starting/ending points for
	// audio/video/PDF embeds:
	const patterns = [
		// Starting PDF page
		/#page=\d+$/,
		// Staring/ending playback time
		/#t=[0-9:,]+$/,
	];

	for (const pattern of patterns) {
		const match = link.match(pattern);
		if (match) {
			return match[0];
		}
	}

	return '';
};

export default function(link: Link, options: Options, linkIndexes: LinkIndexes) {
	const resource = link.resource;

	if (!link.resourceReady || !resource || !resource.mime) return '';

	const escapedResourcePath = htmlentities(
		resourceUrl(link.resourceFullPath) + resourceHash(link.href),
	);
	const escapedMime = htmlentities(resource.mime);
	const escapedTitle = htmlentities(resource.title || resource.mime);
	const resourceIdAttribute = resource.id ? ` data-resource-id="${htmlentities(resource.id)}"` : '';

	if (options.videoPlayerEnabled && resource.mime.indexOf('video/') === 0) {
		const playbackAttributes = options.autoplayVideo ? 'autoplay muted playsinline preload="auto"' : 'preload="metadata"';
		return `
			<video class="media-player media-video" controls${resourceIdAttribute} ${playbackAttributes} aria-label="${escapedTitle}">
				<source src="${escapedResourcePath}" type="${escapedMime}">
			</video>
		`;
	}

	if (options.audioPlayerEnabled && resource.mime.indexOf('audio/') === 0) {
		// We want to support both audio/x-flac and audio/flac MIME types, but chromium only supports audio/flac
		// https://github.com/laurent22/joplin/issues/6434
		const escapedAudioMime = escapedMime === 'audio/x-flac' ? 'audio/flac' : escapedMime;
		return `
			<audio class="media-player media-audio" controls preload="metadata" aria-label="${escapedTitle}">
				<source src="${escapedResourcePath}" type="${escapedAudioMime}">
			</audio>
		`;
	}

	if (options.pdfViewerEnabled && resource.mime === 'application/pdf') {

		if (options.useCustomPdfViewer) {
			const resourceId = resource.id;
			let anchorPageNo = null;

			let id = `${options.noteId}.${resourceId}`;
			if (linkIndexes && linkIndexes[resourceId]) {
				linkIndexes[resourceId]++;
			} else {
				linkIndexes[resourceId] = 1;
			}
			id += `.${linkIndexes[resourceId]}`;

			if (link.href.indexOf('#') > 0) {
				anchorPageNo = Number(link.href.split('#').pop());
				if (anchorPageNo < 1) anchorPageNo = null;
			}

			const src = `${options.vendorDir}/lib/@joplin/pdf-viewer/index.html`;

			return `<iframe src="${src}" x-url="${escapedResourcePath}" 
			x-appearance="${options.theme.appearance}" ${anchorPageNo ? `x-anchorPage="${anchorPageNo}"` : ''} id="${id}"
			x-type="mini" x-resourceid="${resourceId}"
		 class="media-player media-pdf"></iframe>`;
		}

		return `<object data="${escapedResourcePath}" class="media-player media-pdf" type="${escapedMime}"></object>`;
	}

	return '';
}