From 530a6b8800d799e8a1c2c493d5bd6ec881fc246c Mon Sep 17 00:00:00 2001
From: Laurynas Karvelis <laurynas.karvelis@gmail.com>
Date: Tue, 27 Feb 2018 14:02:57 +0200
Subject: [PATCH] Allow sending messages longer than 4096 chars

---
 src/types/Base.js | 18 +++++++++++++++++-
 1 file changed, 17 insertions(+), 1 deletion(-)

diff --git a/src/types/Base.js b/src/types/Base.js
index d43c043..634139d 100644
--- a/src/types/Base.js
+++ b/src/types/Base.js
@@ -1,6 +1,7 @@
 import { EventEmitter } from 'events';
 
 const ANSWER_THRESHOLD = 10;
+const MSG_MAX_LENGTH = 4096;
 
 /**
  * Base class of all classes
@@ -35,7 +36,22 @@ export default class Base extends EventEmitter {
 
     let messageId;
     return new Promise((resolve, reject) => {
-      bot.api[this.method](this.properties).then(response => {
+      let promiseChain;
+
+      if (this.method === 'sendMessage' && this.properties.text.length > MSG_MAX_LENGTH) {
+        promiseChain = Promise.resolve();
+        const textChunks = this.properties.text.match(new RegExp(`.{1,${MSG_MAX_LENGTH}}`, 'g'));
+
+        textChunks.forEach(chunk => {
+          const properties = Object.assign({}, this.properties, { text: chunk });
+          delete properties.parse_mode; // any unclosed tags, text modifiers will not send out, send as pure text
+          promiseChain = promiseChain.then(() => bot.api[this.method](properties));
+        });
+      } else {
+        promiseChain = bot.api[this.method](this.properties);
+      }
+
+      promiseChain.then(response => {
         messageId = response.result.message_id;
         this.emit('message:sent', response);
       }).catch(reject);