const fs = require('fs-extra');
const { shim } = require('lib/shim.js');
const { time } = require('lib/time-utils.js');
const Mustache = require('mustache');

const TemplateUtils = {};

// new template variables can be added here
// If there are too many, this should be moved to a new file
const view = {
	date: time.formatMsToLocal(new Date().getTime(), time.dateFormat()),
	time: time.formatMsToLocal(new Date().getTime(), time.timeFormat()),
	datetime: time.formatMsToLocal(new Date().getTime()),
	custom_datetime: () =>  { return (text, render) => {
		return render(time.formatMsToLocal(new Date().getTime(), text));
	}},
}

// Mustache escapes strings (including /) with the html code by default
// This isn't useful for markdown so it's disabled
Mustache.escape = (text) => { return text; }

TemplateUtils.render = function(input) {
	return Mustache.render(input, view);
}

TemplateUtils.loadTemplates = async function(filePath) {
		let templates = [];
		let files = [];

		if (await shim.fsDriver().exists(filePath)) {
			try {
				files = await shim.fsDriver().readDirStats(filePath);
			} catch (error) {
				let msg = error.message ? error.message : '';
				msg = 'Could not read template names from ' + filePath + '\n' + msg;
				error.message = msg;
				throw error;
			}

			files.forEach(async (file) => {
				if (file.path.endsWith('.md')) {
					try {
						let fileString = await shim.fsDriver().readFile(filePath + '/' + file.path, 'utf-8');
						templates.push({label: file.path, value: fileString});
					} catch (error) {
						let msg = error.message ? error.message : '';
						msg = 'Could not load template ' + file.path + '\n' + msg;
						error.message = msg;
						throw error;
					}
				}
			});
		}

		return templates;
	}

module.exports = TemplateUtils;