Add TemplateService class to handle rendering templates and layouts

src/services/template.js

@@ -0,0 +1,80 @@
+const fs = require('fs');
+const path = require('path');
+
+const hbs = require('handlebars');
+
+const { basedir } = require('../config/constants');
+const emitter = require('./eventEmitter');
+
+
+class TemplateService {
+
+
+  /**
+   * 
+   * @param string url 
+   * @return string
+   */
+  getTemplatePath(name) {
+    // check if template exists before returning it
+    const templatePath = path.join(basedir, 'src/views/', `${name}.hbs`);
+
+    if (fs.existsSync(templatePath)) {
+      return templatePath;
+    }
+
+    return null;
+  }
+
+  /**
+   * 
+   * @param string name 
+   * @param object data 
+   * @param object params 
+   * @return string
+   */
+  render(name, data = {}, params = {}) {
+    const templatePath = this.getTemplatePath(name);
+
+    emitter.emit('template.render', { name, templatePath, data, params });
+
+    if (!templatePath) {
+      return '';
+    }
+
+    const template = fs.readFileSync(templatePath, 'utf-8');
+
+    const compiledTemplate = hbs.compile(template, params);
+
+    return compiledTemplate(data);
+  }
+
+  /**
+   * 
+   * @param string name 
+   * @param object data 
+   * @param object params 
+   * @return string
+   */
+  renderPage(name, data = {}, layout = 'main', params = {}) {
+    // Get the page template
+    const pageTemplate = this.render(`pages/${name}`, data, params);
+
+    if ( !pageTemplate ) {
+      return '';
+    }
+    
+
+    // Get the layout template
+    const layoutTemplate = this.render(`layout/${layout}`, {...data, ...{ body: pageTemplate }}, params);
+
+    if ( !layoutTemplate ) {
+      return '';
+    }
+
+    return layoutTemplate;
+  }
+  
+}
+
+module.exports = TemplateService;