feat: Inital commit

internal/notifier/notifier.go

@@ -0,0 +1,7 @@
+package notifier
+
+// Notifier defines the interface for sending notifications.
+type Notifier interface {
+	// Broadcast sends a message to a given list of chat IDs.
+	Broadcast(chatIDs []int64, message string) error
+}

internal/notifier/telegram.go

@@ -0,0 +1,53 @@
+package notifier
+
+import (
+	"log"
+	"sync"
+
+	"git.pengzhan.dev/aimaren/internal/config"
+
+	tgbotapi "github.com/go-telegram-bot-api/telegram-bot-api/v5"
+)
+
+// TelegramNotifier no longer needs to store chat IDs.
+type TelegramNotifier struct {
+	bot *tgbotapi.BotAPI
+}
+
+// NewTelegramNotifier is now simpler and only requires the token.
+func NewTelegramNotifier(cfg config.Config) (*TelegramNotifier, error) {
+	bot, err := tgbotapi.NewBotAPI(cfg.Telegram.Token)
+	if err != nil {
+		return nil, err
+	}
+	return &TelegramNotifier{bot: bot}, nil
+}
+
+// Broadcast sends a message to all provided chat IDs in parallel.
+func (t *TelegramNotifier) Broadcast(chatIDs []int64, message string) error {
+	var wg sync.WaitGroup
+
+	for _, id := range chatIDs {
+		wg.Add(1)
+		// Launch a goroutine for each message to send them concurrently.
+		go func(chatID int64) {
+			defer wg.Done()
+			msg := tgbotapi.NewMessage(chatID, message)
+			if _, err := t.bot.Send(msg); err != nil {
+				log.Printf("⚠️ Failed to send Telegram notification to chat ID %d: %v", chatID, err)
+			}
+		}(id)
+	}
+
+	// Wait for all messages to be sent before returning.
+	wg.Wait()
+	return nil
+}
+
+// SendTo sends a message to a single, specific chat ID.
+// This is used by the bot-server for welcome messages.
+func (t *TelegramNotifier) SendTo(chatID int64, message string) error {
+	msg := tgbotapi.NewMessage(chatID, message)
+	_, err := t.bot.Send(msg)
+	return err
+}