feat: add Telegram bot with notifications and scheduler

internal/bot/bot.go

@@ -0,0 +1,74 @@
+package bot
+
+import (
+	"log"
+	"sync"
+
+	tgbotapi "github.com/go-telegram-bot-api/telegram-bot-api/v5"
+	"github.com/daniil/homelab-api/internal/repository"
+)
+
+type Bot struct {
+	api       *tgbotapi.BotAPI
+	userRepo  *repository.UserRepository
+	taskRepo  *repository.TaskRepository
+	habitRepo *repository.HabitRepository
+	mu        sync.Mutex
+}
+
+func New(token string, userRepo *repository.UserRepository, taskRepo *repository.TaskRepository, habitRepo *repository.HabitRepository) (*Bot, error) {
+	if token == "" {
+		return nil, nil
+	}
+
+	api, err := tgbotapi.NewBotAPI(token)
+	if err != nil {
+		return nil, err
+	}
+
+	log.Printf("Telegram bot authorized on account %s", api.Self.UserName)
+
+	return &Bot{
+		api:       api,
+		userRepo:  userRepo,
+		taskRepo:  taskRepo,
+		habitRepo: habitRepo,
+	}, nil
+}
+
+func (b *Bot) Start() {
+	if b == nil || b.api == nil {
+		return
+	}
+
+	u := tgbotapi.NewUpdate(0)
+	u.Timeout = 60
+
+	updates := b.api.GetUpdatesChan(u)
+
+	for update := range updates {
+		if update.Message == nil {
+			continue
+		}
+
+		go b.handleMessage(update.Message)
+	}
+}
+
+func (b *Bot) SendMessage(chatID int64, text string) error {
+	if b == nil || b.api == nil {
+		return nil
+	}
+
+	msg := tgbotapi.NewMessage(chatID, text)
+	msg.ParseMode = "HTML"
+	_, err := b.api.Send(msg)
+	return err
+}
+
+func (b *Bot) GetAPI() *tgbotapi.BotAPI {
+	if b == nil {
+		return nil
+	}
+	return b.api
+}