From bdb0f1f4c5dac4388bb0de5610be737ca2ca378d Mon Sep 17 00:00:00 2001
From: Mohamad Jahani <m4m4lj@gmail.com>
Date: Thu, 8 Jun 2017 14:02:05 +0430
Subject: [PATCH] feat(bot): implement deleteMessage method

---
 bot.go      | 12 ++++++++++++
 bot_test.go | 19 +++++++++++++++++++
 configs.go  | 19 +++++++++++++++++++
 3 files changed, 50 insertions(+)

diff --git a/bot.go b/bot.go
index 2ff6fa2..2fd9a8e 100644
--- a/bot.go
+++ b/bot.go
@@ -740,3 +740,15 @@ func (bot *BotAPI) AnswerPreCheckoutQuery(config PreCheckoutConfig) (APIResponse
 
 	return bot.MakeRequest("answerPreCheckoutQuery", v)
 }
+
+// DeleteMessage deletes a message in a chat
+func (bot *BotAPI) DeleteMessage(config DeleteMessageConfig) (APIResponse, error) {
+	v, err := config.values()
+	if err != nil {
+		return APIResponse{}, err
+	}
+
+	bot.debugLog(config.method(), v, nil)
+
+	return bot.MakeRequest(config.method(), v)
+}
diff --git a/bot_test.go b/bot_test.go
index a001dcd..d7cec08 100644
--- a/bot_test.go
+++ b/bot_test.go
@@ -590,3 +590,22 @@ func ExampleAnswerInlineQuery() {
 		}
 	}
 }
+
+func TestDeleteMessage(t *testing.T) {
+	bot, _ := getBot(t)
+
+	msg := tgbotapi.NewMessage(ChatID, "A test message from the test library in telegram-bot-api")
+	msg.ParseMode = "markdown"
+	message, _ := bot.Send(msg)
+
+	deleteMessageConfig := tgbotapi.DeleteMessageConfig{
+		ChatID:    message.Chat.ID,
+		MessageID: message.MessageID,
+	}
+	_, err := bot.DeleteMessage(deleteMessageConfig)
+
+	if err != nil {
+		t.Error(err)
+		t.Fail()
+	}
+}
diff --git a/configs.go b/configs.go
index 5f3f259..a4a0622 100644
--- a/configs.go
+++ b/configs.go
@@ -986,3 +986,22 @@ type PreCheckoutConfig struct {
 	OK                 bool   // required
 	ErrorMessage       string
 }
+
+// DeleteMessageConfig contains information of a message in a chat to delete.
+type DeleteMessageConfig struct {
+	ChatID    int64
+	MessageID int
+}
+
+func (config DeleteMessageConfig) method() string {
+	return "deleteMessage"
+}
+
+func (config DeleteMessageConfig) values() (url.Values, error) {
+	v := url.Values{}
+
+	v.Add("chat_id", strconv.FormatInt(config.ChatID, 10))
+	v.Add("message_id", strconv.Itoa(config.MessageID))
+
+	return v, nil
+}