Add BulkMessage Type

lib/types/BulkMessage.js

@@ -0,0 +1,45 @@
+import Message from './Message';
+
+/**
+ * Message class, used to send a message to multiple chats
+ */
+export default class BulkMessage extends Message {
+  /**
+   * Create a new message
+   * @param  {object} properties Message properties, as defined by Telegram API
+   */
+  constructor(properties = {}) {
+    super(properties);
+
+    this.chats = [];
+  }
+
+  /**
+   * Set multiple chat_id's for the message
+   * @param  {number} chat
+   * @return {object} returns the message object
+   */
+  to(...args) {
+    const chats = args.reduce((a, b) => {
+      return a.concat(b);
+    }, []);
+
+    this.chats = chats;
+    return this;
+  }
+
+  /**
+   * Send the message to all chats
+   * @param  {Bot} bot
+   * @return {Promise} Resolved when the message is sent to all chats
+   */
+  send(bot) {
+    const promises = this.chats.map(chat => {
+      const clone = Object.assign({}, this.properties);
+      const message = new Message(clone).to(chat);
+      return message.send(bot);
+    });
+
+    return Promise.all(promises);
+  }
+}