fix(core): update

ts/smartmail.classes.smartmail.ts

@@ -1,11 +1,33 @@
 import * as plugins from './smartmail.plugins';
 
+export interface ISmartmailOptions {
+  from: string;
+  subject: string;
+  body: string;
+}
+
 /**
  * a standard representation for mails
  */
 export class Smartmail {
-  from: string;
-  to: string;
-  body: string;
-  attachments: any[];
+  public options: ISmartmailOptions;
+  public attachments: plugins.smartfile.Smartfile[];
+
+  constructor(optionsArg: ISmartmailOptions) {
+    this.options = optionsArg;
+  }
+
+  public addAttachment(smartfileArg: plugins.smartfile.Smartfile) {
+    this.attachments.push(smartfileArg);
+  }
+
+  public getSubject(dataArg: any = {}) {
+    const smartmustache = new plugins.smartmustache.SmartMustache(this.options.subject);
+    return smartmustache.applyData(dataArg);
+  }
+
+  public getBody(dataArg: any = {}) {
+    const smartmustache = new plugins.smartmustache.SmartMustache(this.options.body);
+    return smartmustache.applyData(dataArg);
+  }
 }