const InteropService_Importer_Base = require('lib/services/InteropService_Importer_Base');
const Folder = require('lib/models/Folder.js');
const Note = require('lib/models/Note.js');
const { basename, filename, rtrimSlashes, fileExtension, dirname } = require('lib/path-utils.js');
const { shim } = require('lib/shim');
const { _ } = require('lib/locale');
const { extractImageUrls } = require('lib/markdownUtils');
const { unique } = require('lib/ArrayUtils');
const { pregQuote } = require('lib/string-utils-common');

class InteropService_Importer_Md extends InteropService_Importer_Base {
	async exec(result) {
		let parentFolderId = null;

		const sourcePath = rtrimSlashes(this.sourcePath_);

		const filePaths = [];
		if (await shim.fsDriver().isDirectory(sourcePath)) {
			if (!this.options_.destinationFolder) {
				const folderTitle = await Folder.findUniqueItemTitle(basename(sourcePath));
				const folder = await Folder.save({ title: folderTitle });
				parentFolderId = folder.id;
			} else {
				parentFolderId = this.options_.destinationFolder.id;
			}

			this.importDirectory(sourcePath, parentFolderId);
		} else {
			if (!this.options_.destinationFolder) throw new Error(_('Please specify the notebook where the notes should be imported to.'));
			parentFolderId = this.options_.destinationFolder.id;
			filePaths.push(sourcePath);
		}

		for (let i = 0; i < filePaths.length; i++) {
			await this.importFile(filePaths[i], parentFolderId);
		}

		return result;
	}

	async importDirectory(dirPath, parentFolderId) {
		console.info(`Import: ${dirPath}`);

		const supportedFileExtension = this.metadata().fileExtensions;
		const stats = await shim.fsDriver().readDirStats(dirPath);
		for (let i = 0; i < stats.length; i++) {
			const stat = stats[i];

			if (stat.isDirectory()) {
				const folderTitle = await Folder.findUniqueItemTitle(basename(stat.path));
				const folder = await Folder.save({ title: folderTitle, parent_id: parentFolderId });
				this.importDirectory(`${dirPath}/${basename(stat.path)}`, folder.id);
			} else if (supportedFileExtension.indexOf(fileExtension(stat.path).toLowerCase()) >= 0) {
				this.importFile(`${dirPath}/${stat.path}`, parentFolderId);
			}
		}
	}

	/**
	 * Parse text for links, attempt to find local file, if found create Joplin resource
	 * and update link accordingly.
	 */
	async importLocalImages(filePath, md) {
		let updated = md;
		const imageLinks = unique(extractImageUrls(md));
		await Promise.all(imageLinks.map(async (link) => {
			const attachmentPath = filename(`${dirname(filePath)}/${link}`, true);
			const pathWithExtension =  `${attachmentPath}.${fileExtension(link)}`;
			const stat = await shim.fsDriver().stat(pathWithExtension);
			const isDir = stat ? stat.isDirectory() : false;
			if (stat && !isDir) {
				const resource = await shim.createResourceFromPath(pathWithExtension);
				// NOTE: use ](link) in case the link also appears elsewhere, such as in alt text
				const linkPatternEscaped = pregQuote(`](${link})`);
				const reg = new RegExp(linkPatternEscaped, 'g');
				updated = updated.replace(reg, `](:/${resource.id})`);
			}
		}));
		return updated;
	}

	async importFile(filePath, parentFolderId) {
		const stat = await shim.fsDriver().stat(filePath);
		if (!stat) throw new Error(`Cannot read ${filePath}`);
		const title = filename(filePath);
		const body = await shim.fsDriver().readFile(filePath);
		let updatedBody;
		try {
			updatedBody = await this.importLocalImages(filePath, body);
		} catch (error) {
			// console.error(`Problem importing links for file ${filePath}, error:\n ${error}`);
		}
		const note = {
			parent_id: parentFolderId,
			title: title,
			body: updatedBody || body,
			updated_time: stat.mtime.getTime(),
			created_time: stat.birthtime.getTime(),
			user_updated_time: stat.mtime.getTime(),
			user_created_time: stat.birthtime.getTime(),
		};

		return Note.save(note, { autoTimestamp: false });
	}
}

module.exports = InteropService_Importer_Md;