/* eslint-disable no-invalid-this */
const fs = require('fs');
const path = require('path');
const lunr = require('lunr');
const {capitalCase} = require('change-case');
const {JSDOM} = require('jsdom');
const {customElementsManifest, getAllComponents} = require('./_utilities/cem.cjs');
const egwFlavoredMarkdown = require('./_utilities/markdown.cjs');
const activeLinks = require('./_utilities/active-links.cjs');
const anchorHeadings = require('./_utilities/anchor-headings.cjs');
const codePreviews = require('./_utilities/code-previews.cjs');
const copyCodeButtons = require('./_utilities/copy-code-buttons.cjs');
const externalLinks = require('./_utilities/external-links.cjs');
const highlightCodeBlocks = require('./_utilities/highlight-code.cjs');
const tableOfContents = require('./_utilities/table-of-contents.cjs');
const prettier = require('./_utilities/prettier.cjs');
const scrollingTables = require('./_utilities/scrolling-tables.cjs');
const typography = require('./_utilities/typography.cjs');
const replacer = require('./_utilities/replacer.cjs');

const assetsDir = 'assets';
const cdndir = 'cdn';
const npmdir = 'dist';
const allComponents = getAllComponents();
let hasBuiltSearchIndex = false;

// Write component data to file, 11ty will pick it up and create pages - the name & location are important
fs.writeFileSync("_data/components.json", JSON.stringify(allComponents));

// Put it here too, since addPassthroughCopy() ignores it
fs.copyFileSync("../dist/custom-elements.json", "assets/custom-elements.json");

module.exports = function (eleventyConfig)
{
	//
	// Global data
	//
	eleventyConfig.addGlobalData('baseUrl', 'https://egroupware.org/'); // the production URL
	eleventyConfig.addGlobalData('layout', 'default'); // make 'default' the default layout
	eleventyConfig.addGlobalData('toc', true); // enable the table of contents
	eleventyConfig.addGlobalData('meta', {
		title: 'EGroupware',
		description: '',
		image: 'images/logo.svg',
		version: customElementsManifest.package.version,
		components: allComponents,
		cdndir,
		npmdir
	});

	//
	// Layout aliases
	//
	eleventyConfig.addLayoutAlias('default', 'default.njk');

	//
	// Copy EGw stuff in
	//
	eleventyConfig.addPassthroughCopy({"../../api/templates/default/images/logo.svg": "assets/images/logo.svg"});
	eleventyConfig.addPassthroughCopy({"../../pixelegg/css/monochrome.css": "assets/styles/monochrome.css"});
	//eleventyConfig.addPassthroughCopy({"../../api/js": "assets/scripts/chunks"});
	eleventyConfig.addPassthroughCopy({"../../api/js/etemplate/etemplate2.js": "assets/scripts/etemplate/etemplate2.js"});

	// Shoelace
	eleventyConfig.addPassthroughCopy({"../../node_modules/@shoelace-style/shoelace/dist/": "assets/shoelace/"});
	/*
	eleventyConfig.addPassthroughCopy({"../../node_modules/@shoelace-style/shoelace/dist/shoelace-autoloader.js": "assets/shoelace/shoelace-autoloader.js"});
	eleventyConfig.addPassthroughCopy({"../../node_modules/@shoelace-style/shoelace/dist/themes/*": "assets/shoelace/themes/"});
	eleventyConfig.addPassthroughCopy({"../../node_modules/@shoelace-style/shoelace/dist/chunks/*": "assets/shoelace/chunks/"});
	eleventyConfig.addPassthroughCopy({"../../node_modules/@shoelace-style/shoelace/dist/assets/*": "assets/shoelace/assets/"});
	eleventyConfig.addPassthroughCopy({"../../node_modules/@shoelace-style/shoelace/dist/components/*": "assets/shoelace/components/"});
	*/

	//
	// Copy assets
	//
	eleventyConfig.addPassthroughCopy(assetsDir);

	eleventyConfig.setServerPassthroughCopyBehavior('passthrough'); // emulates passthrough copy during --serve

	//
	// Functions
	//

	// Generates a URL relative to the site's root
	eleventyConfig.addNunjucksGlobal('rootUrl', (value = '', absolute = false) =>
	{
		value = path.join('/', value);
		return absolute ? new URL(value, eleventyConfig.globalData.baseUrl).toString() : value;
	});

	// Generates a URL relative to the site's asset directory
	eleventyConfig.addNunjucksGlobal('assetUrl', (value = '', absolute = false) =>
	{
		value = path.join(`/${assetsDir}`, value);
		return absolute ? new URL(value, eleventyConfig.globalData.baseUrl).toString() : value;
	});

	// Fetches a specific component's metadata
	eleventyConfig.addNunjucksGlobal('getComponent', tagName =>
	{
		const component = allComponents.find(c => c.tagName === tagName);
		if (!component)
		{
			throw new Error(
				`Unable to find a component called "${tagName}". Make sure the file name is the same as the component's tag ` +
				`name (minus the sl- prefix).`
			);
		}
		return component;
	});

	//
	// Custom markdown syntaxes
	//
	eleventyConfig.setLibrary('md', egwFlavoredMarkdown);

	//
	// Filters
	//
	eleventyConfig.addFilter('markdown', content =>
	{
		return egwFlavoredMarkdown.render(content);
	});

	eleventyConfig.addFilter('markdownInline', content =>
	{
		return egwFlavoredMarkdown.renderInline(content);
	});

	eleventyConfig.addFilter('classNameToComponentName', className =>
	{
		let name = capitalCase(className.replace(/^Sl/, ''));
		if (name === 'Qr Code')
		{
			name = 'QR Code';
		} // manual override
		return name;
	});

	eleventyConfig.addFilter('removeSlPrefix', tagName =>
	{
		return tagName.replace(/^sl-/, '');
	});

	//
	// Transforms
	//
	eleventyConfig.addTransform('html-transform', function (content)
	{
		// Parse the template and get a Document object
		const doc = new JSDOM(content, {
			// We must set a default URL so links are parsed with a hostname. Let's use a bogus TLD so we can easily
			// identify which ones are internal and which ones are external.
			url: `https://internal/`
		}).window.document;

		// DOM transforms
		activeLinks(doc, {pathname: this.page.url});
		anchorHeadings(doc, {
			within: '#content .content__body',
			levels: ['h2', 'h3', 'h4', 'h5']
		});
		tableOfContents(doc, {
			levels: ['h2', 'h3'],
			container: '#content .content__toc > ul',
			within: '#content .content__body'
		});
		codePreviews(doc);
		externalLinks(doc, {target: '_blank'});
		highlightCodeBlocks(doc);
		scrollingTables(doc);
		copyCodeButtons(doc); // must be after codePreviews + highlightCodeBlocks
		typography(doc, '#content');
		replacer(doc, [
			{pattern: '%VERSION%', replacement: customElementsManifest.package.version},
			{pattern: '%CDNDIR%', replacement: cdndir},
			{pattern: '%NPMDIR%', replacement: npmdir}
		]);

		// Serialize the Document object to an HTML string and prepend the doctype
		content = `<!DOCTYPE html>\n${doc.documentElement.outerHTML}`;

		// String transforms
		content = prettier(content);

		return content;
	});

	//
	// Build a search index
	//
	eleventyConfig.on('eleventy.after', ({results}) =>
	{
		// We only want to build the search index on the first run so all pages get indexed.
		if (hasBuiltSearchIndex)
		{
			return;
		}

		const map = {};
		const searchIndexFilename = path.join(eleventyConfig.dir.output, assetsDir, 'search.json');
		const lunrInput = path.resolve('../../node_modules/lunr/lunr.min.js');
		const lunrOutput = path.join(eleventyConfig.dir.output, assetsDir, 'scripts/lunr.js');
		const searchIndex = lunr(function ()
		{
			// The search index uses these field names extensively, so shortening them can save some serious bytes. The
			// initial index file went from 468 KB => 401 KB by using single-character names!
			this.ref('id'); // id
			this.field('t', {boost: 50}); // title
			this.field('h', {boost: 25}); // headings
			this.field('c'); // content

			results.forEach((result, index) =>
			{
				const url = path
					.join('/', path.relative(eleventyConfig.dir.output, result.outputPath))
					.replace(/\\/g, '/') // convert backslashes to forward slashes
					.replace(/\/index.html$/, '/'); // convert trailing /index.html to /
				const doc = new JSDOM(result.content, {
					// We must set a default URL so links are parsed with a hostname. Let's use a bogus TLD so we can easily
					// identify which ones are internal and which ones are external.
					url: `https://internal/`
				}).window.document;
				const content = doc.querySelector('#content');

				// Get title and headings
				const title = (doc.querySelector('title')?.textContent || path.basename(result.outputPath)).trim();
				const headings = [...content.querySelectorAll('h1, h2, h3, h4')]
					.map(heading => heading.textContent)
					.join(' ')
					.replace(/\s+/g, ' ')
					.trim();

				// Remove code blocks and whitespace from content
				[...content.querySelectorAll('code[class|=language]')].forEach(code => code.remove());
				const textContent = content.textContent.replace(/\s+/g, ' ').trim();

				// Update the index and map
				this.add({id: index, t: title, h: headings, c: textContent});
				map[index] = {title, url};
			});
		});

		// Copy the Lunr search client and write the index
		fs.mkdirSync(path.dirname(lunrOutput), {recursive: true});
		fs.copyFileSync(lunrInput, lunrOutput);
		fs.writeFileSync(searchIndexFilename, JSON.stringify({searchIndex, map}), 'utf-8');

		hasBuiltSearchIndex = true;
	});

	//
	// Send a signal to stdout that let's the build know we've reached this point
	//
	eleventyConfig.on('eleventy.after', () =>
	{
		console.log('[eleventy.after]');
	});

	//
	// Dev server options (see https://www.11ty.dev/docs/dev-server/#options)
	//
	eleventyConfig.setServerOptions({
		domDiff: false, // disable dom diffing so custom elements don't break on reload,
		port: 4000, // if port 4000 is taken, 11ty will use the next one available
		watch: ['cdn/**/*'] // additional files to watch that will trigger server updates (array of paths or globs)
	});

	//
	// 11ty config
	//
	return {
		dir: {
			input: 'pages',
			output: '../dist/site',
			includes: '../_includes', // resolved relative to the input dir
			data: '../_data'
		},
		markdownTemplateEngine: 'njk', // use Nunjucks instead of Liquid for markdown files
		templateEngineOverride: ['njk'] // just Nunjucks and then markdown
	};
};