const InteropService_Exporter_Base = require('lib/services/InteropService_Exporter_Base');
const { basename, friendlySafeFilename, rtrimSlashes } = require('lib/path-utils.js');
const BaseModel = require('lib/BaseModel');
const Folder = require('lib/models/Folder');
const Note = require('lib/models/Note');
const Setting = require('lib/models/Setting');
const { shim } = require('lib/shim');
const { themeStyle } = require('../../theme.js');
const { dirname } = require('lib/path-utils.js');
const { escapeHtml } = require('lib/string-utils.js');
const markupLanguageUtils = require('lib/markupLanguageUtils');
const { assetsToHeaders } = require('lib/joplin-renderer');

class InteropService_Exporter_Html extends InteropService_Exporter_Base {

	async init(path, options = {}) {
		this.customCss_ = options.customCss ? options.customCss : '';

		if (this.metadata().target === 'file') {
			this.destDir_ = dirname(path);
			this.filePath_ = path;
		} else {
			this.destDir_ = path;
			this.filePath_ = null;
		}

		this.createdDirs_ = [];
		this.resourceDir_ = this.destDir_ ? `${this.destDir_}/_resources` : null;

		await shim.fsDriver().mkdir(this.destDir_);
		this.markupToHtml_ = markupLanguageUtils.newMarkupToHtml();
		this.resources_ = [];
		this.style_ = themeStyle(Setting.THEME_LIGHT);
	}

	async makeDirPath_(item, pathPart = null) {
		let output = '';
		while (true) {
			if (item.type_ === BaseModel.TYPE_FOLDER) {
				if (pathPart) {
					output = `${pathPart}/${output}`;
				} else {
					output = `${friendlySafeFilename(item.title, null, true)}/${output}`;
					output = await shim.fsDriver().findUniqueFilename(output);
				}
			}
			if (!item.parent_id) return output;
			item = await Folder.load(item.parent_id);
		}
	}

	async processNoteResources_(item) {
		const target = this.metadata().target;
		const linkedResourceIds = await Note.linkedResourceIds(item.body);
		const relativePath = target === 'directory' ? rtrimSlashes(await this.makeDirPath_(item, '..')) : '';
		const resourcePaths = this.context() && this.context().resourcePaths ? this.context().resourcePaths : {};

		let newBody = item.body;

		for (let i = 0; i < linkedResourceIds.length; i++) {
			const id = linkedResourceIds[i];
			const resourceContent = `${relativePath ? `${relativePath}/` : ''}_resources/${basename(resourcePaths[id])}`;
			newBody = newBody.replace(new RegExp(`:/${id}`, 'g'), resourceContent);
		}

		return newBody;
	}

	async processItem(ItemClass, item) {
		if ([BaseModel.TYPE_NOTE, BaseModel.TYPE_FOLDER].indexOf(item.type_) < 0) return;

		let dirPath = '';
		if (!this.filePath_) {
			dirPath = `${this.destDir_}/${await this.makeDirPath_(item)}`;

			if (this.createdDirs_.indexOf(dirPath) < 0) {
				await shim.fsDriver().mkdir(dirPath);
				this.createdDirs_.push(dirPath);
			}
		}

		if (item.type_ === BaseModel.TYPE_NOTE) {
			let noteFilePath = '';

			if (this.filePath_) {
				noteFilePath = this.filePath_;
			} else {
				noteFilePath = `${dirPath}/${friendlySafeFilename(item.title, null, true)}.html`;
				noteFilePath = await shim.fsDriver().findUniqueFilename(noteFilePath);
			}

			const bodyMd = await this.processNoteResources_(item);
			const result = await this.markupToHtml_.render(item.markup_language, bodyMd, this.style_, {
				resources: this.resources_,
				plainResourceRendering: true,
				userCss: this.customCss_,
			});
			const noteContent = [];
			if (item.title) noteContent.push(`<div class="exported-note-title">${escapeHtml(item.title)}</div>`);
			if (result.html) noteContent.push(result.html);

			// We need to export all the plugin assets too and refer them from the header
			// The source path is a bit hard-coded but shouldn't change.
			for (let i = 0; i < result.pluginAssets.length; i++) {
				const asset = result.pluginAssets[i];
				const filePath = `${dirname(dirname(__dirname))}/gui/note-viewer/pluginAssets/${asset.name}`;
				const destPath = `${dirname(noteFilePath)}/pluginAssets/${asset.name}`;
				await shim.fsDriver().mkdir(dirname(destPath));
				await shim.fsDriver().copy(filePath, destPath);
			}

			const fullHtml = `
				<!DOCTYPE html>
				<html>
					<head>
						<meta charset="UTF-8">
						${assetsToHeaders(result.pluginAssets, { asHtml: true })}
						<title>${escapeHtml(item.title)}</title>
					</head>
					<body>
						<div class="exported-note">${noteContent.join('\n\n')}</div>
					</body>
				</html>
			`;

			await shim.fsDriver().writeFile(noteFilePath, fullHtml, 'utf-8');
		}
	}

	async processResource(resource, filePath) {
		const destResourcePath = `${this.resourceDir_}/${basename(filePath)}`;
		await shim.fsDriver().copy(filePath, destResourcePath);
		this.resources_.push(resource);
	}

	async close() {}
}

module.exports = InteropService_Exporter_Html;