1 files changed, 142 insertions, 0 deletions
diff --git a/telegram_bot.go b/telegram_bot.go
new file mode 100644
index 0000000..f096823
--- /dev/null
+++ b/telegram_bot.go
@@ -0,0 +1,142 @@
+// Copyright 2020, Shulhan <m.shulhan@gmail.com>. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package kbbi
+
+import (
+	"bytes"
+	"fmt"
+	"log"
+	"strings"
+
+	"github.com/shuLhan/share/api/telegram/bot"
+)
+
+const (
+	defAddress = ":1928"
+
+	commandBantuan  = "bantuan"
+	commandDefinisi = "definisi"
+)
+
+//
+// TelegramBot implement Telegram Bot for KBBI.
+//
+type TelegramBot struct {
+	*bot.Bot
+	apiClient *apiClient
+}
+
+//
+// NewTelegramBot create and initialize new Telegram Bot.
+//
+func NewTelegramBot(token, webhookURL string) (tgbot *TelegramBot, err error) {
+	tgbot = &TelegramBot{
+		apiClient: newAPIClient(""),
+	}
+
+	var commands = []bot.Command{{
+		Command: commandDefinisi,
+		Description: "Cari definisi dari satu atau lebih kata." +
+			" Pisahkan antara kata dengan koma.",
+		Handler: tgbot.handleCommandDefinisi,
+	}}
+
+	opts := bot.Options{
+		Token:        token,
+		HandleUpdate: tgbot.handleUpdate,
+		Webhook: &bot.Webhook{
+			URL:           webhookURL,
+			ListenAddress: defAddress,
+		},
+	}
+
+	tgbot.Bot, err = bot.New(opts)
+	if err != nil {
+		return nil, fmt.Errorf("NewTelegramBot: %w", err)
+	}
+
+	err = tgbot.SetMyCommands(commands)
+	if err != nil {
+		return nil, fmt.Errorf("NewTelegramBot: %w", err)
+	}
+
+	return tgbot, nil
+}
+
+//
+// handleUpdate process the Update information send by Telegram server.
+//
+func (tgbot *TelegramBot) handleUpdate(update bot.Update) {
+	if update.Message == nil {
+		return
+	}
+	fmt.Printf("update.Message: %+v\n", update.Message)
+}
+
+//
+// handleCommandDefinisi lookup the words definition and reply back to client.
+//
+func (tgbot *TelegramBot) handleCommandDefinisi(update bot.Update) {
+	msgReq := update.Message
+	fmt.Printf("handleCommandDefinisi: %q %q\n", msgReq.Command,
+		msgReq.CommandArgs)
+
+	daftarKata := strings.Split(msgReq.CommandArgs, ",")
+
+	def, err := tgbot.apiClient.CariDefinisi(daftarKata)
+	if err != nil {
+		tgbot.sendError(msgReq, err)
+		return
+	}
+
+	text := formatText(def)
+
+	_, err = tgbot.SendMessage(msgReq, bot.ParseModeHTML, text)
+	if err != nil {
+		log.Printf("handleCommandDefinisi: %s", err)
+		return
+	}
+}
+
+func (tgbot *TelegramBot) sendError(msg *bot.Message, err error) {
+	_, err = tgbot.SendMessage(msg, "", err.Error())
+	if err != nil {
+		log.Printf("sendError: %s", err)
+		return
+	}
+}
+
+func formatText(definisiKata DefinisiResponse) string {
+	buf := &bytes.Buffer{}
+	for k, kata := range definisiKata {
+		fmt.Fprintf(buf, "<b>%s</b>\n", k)
+
+		if len(kata.Dasar) > 0 {
+			fmt.Fprintf(buf, "  Kata dasar: <i>%s</i>\n\n",
+				kata.Dasar)
+		}
+
+		for x, def := range kata.Definisi {
+			fmt.Fprintf(buf, "  Definisi #%d: %s\n", x+1, def.Isi)
+
+			if len(def.Kelas) > 0 {
+				fmt.Fprintln(buf, "    Kelas kata,")
+				for _, kelas := range def.Kelas {
+					fmt.Fprintln(buf, "       - "+kelas)
+				}
+			}
+
+			if len(def.Contoh) > 0 {
+				fmt.Fprintln(buf, "    Contoh,")
+				for _, contoh := range def.Contoh {
+					fmt.Fprintln(buf, "       - "+contoh)
+				}
+			}
+			fmt.Fprintln(buf, "")
+		}
+	}
+
+	return buf.String()
+}