Adds initial implementation of the Telegram bot

.gitignore

@@ -1 +1,2 @@
 dist
+config.yml

README.md

@@ -38,5 +38,8 @@ $ make run
 - [ ] Pass logger to the server through an option
 - [ ] Create a configurable template to fill with each notification
 - [ ] Create different message systems to use with the bot
+  - [X] Telegram
+  - [ ] Email
+  - [ ] Mattermost
 - [ ] Reduce logger verbosity
 - [ ] Enjoy!

go.mod

@@ -13,6 +13,7 @@ require (
 	github.com/charmbracelet/lipgloss v0.7.1 // indirect
 	github.com/davecgh/go-spew v1.1.1 // indirect
 	github.com/go-logfmt/logfmt v0.6.0 // indirect
+	github.com/go-telegram-bot-api/telegram-bot-api/v5 v5.5.1 // indirect
 	github.com/lucasb-eyer/go-colorful v1.2.0 // indirect
 	github.com/mattn/go-isatty v0.0.18 // indirect
 	github.com/mattn/go-runewidth v0.0.14 // indirect

go.sum

@@ -8,6 +8,8 @@ github.com/davecgh/go-spew v1.1.1 h1:vj9j/u1bqnvCEfJOwUhtlOARqs3+rkHYY13jYWTU97c
 github.com/davecgh/go-spew v1.1.1/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
 github.com/go-logfmt/logfmt v0.6.0 h1:wGYYu3uicYdqXVgoYbvnkrPVXkuLM1p1ifugDMEdRi4=
 github.com/go-logfmt/logfmt v0.6.0/go.mod h1:WYhtIu8zTZfxdn5+rREduYbwxfcBr/Vr6KEVveWlfTs=
+github.com/go-telegram-bot-api/telegram-bot-api/v5 v5.5.1 h1:wG8n/XJQ07TmjbITcGiUaOtXxdrINDz1b0J1w0SzqDc=
+github.com/go-telegram-bot-api/telegram-bot-api/v5 v5.5.1/go.mod h1:A2S0CWkNylc2phvKXWBBdD3K0iGnDBGbzRpISP2zBl8=
 github.com/lucasb-eyer/go-colorful v1.2.0 h1:1nnpGOrhyZZuNyfu1QjKiUICQ74+3FNCN69Aj6K7nkY=
 github.com/lucasb-eyer/go-colorful v1.2.0/go.mod h1:R4dSotOR9KMtayYi1e77YzuveK+i7ruzyGqttikkLy0=
 github.com/mattn/go-isatty v0.0.18 h1:DOKFKCQ7FNG2L1rbrmstDN4QVRdS89Nkh85u68Uwp98=

notification/service_telegram.go

@@ -1,22 +1,52 @@
 package notification
 
 import (
+	"fmt"
+	"strconv"
+
 	"git.ctrlz.es/mgdelacroix/birthdaybot/model"
 	"github.com/charmbracelet/log"
+	tgbotapi "github.com/go-telegram-bot-api/telegram-bot-api/v5"
 )
 
 type TelegramNotificationService struct {
 	logger *log.Logger
 	config *model.TelegramNotificationsConfig
+	bot    *tgbotapi.BotAPI
 }
 
-func NewTelegramNotificationService(logger *log.Logger, config *model.TelegramNotificationsConfig) *TelegramNotificationService {
+func NewTelegramNotificationService(logger *log.Logger, config *model.TelegramNotificationsConfig) (*TelegramNotificationService, error) {
+	bot, err := tgbotapi.NewBotAPI(config.BotToken)
+	if err != nil {
+		return nil, fmt.Errorf("cannot create bot: %w", err)
+	}
+
+	botUser, err := bot.GetMe()
+	if err != nil {
+		return nil, fmt.Errorf("cannot get bot information: %w", err)
+	}
+
+	logger.Info("telegram bot initialized", "id", botUser.ID, "username", botUser.UserName)
+
 	return &TelegramNotificationService{
 		logger: logger,
 		config: config,
-	}
+		bot:    bot,
+	}, nil
 }
 
 func (tns *TelegramNotificationService) Notify(birthday *model.Birthday) error {
+	// ToDo: introduce templates here
+	msgText := fmt.Sprintf("It's %s's birthday! You can reach them out at %s or %s", birthday.Name, birthday.Email, birthday.Phone)
+	chatID, err := strconv.Atoi(tns.config.ChannelID)
+	if err != nil {
+		return fmt.Errorf("cannot parse ChannelID: %w", err)
+	}
+
+	msg := tgbotapi.NewMessage(int64(chatID), msgText)
+	if _, err := tns.bot.Send(msg); err != nil {
+		return fmt.Errorf("error sending message: %w", err)
+	}
+
 	return nil
 }

server/server.go

@@ -25,7 +25,10 @@ func createNotificationServices(logger *log.Logger, config *model.Config) ([]not
 	notificationServices := []notification.NotificationService{}
 
 	if config.TelegramNotifications != nil {
-		telegramNotificationService := notification.NewTelegramNotificationService(logger, config.TelegramNotifications)
+		telegramNotificationService, err := notification.NewTelegramNotificationService(logger, config.TelegramNotifications)
+		if err != nil {
+			return nil, fmt.Errorf("cannot create telegram notification service: %w", err)
+		}
 		notificationServices = append(notificationServices, telegramNotificationService)
 	}
 
@@ -61,9 +64,9 @@ func New(config *model.Config) (*Server, error) {
 		Logger:               logger,
 		config:               config,
 		birthdays:            birthdays,
-		workers:              []*Worker{NewWorker(logger)},
 		notificationServices: notificationServices,
 	}
+	server.workers = []*Worker{NewWorker(server)}
 
 	return server, nil
 }
@@ -83,3 +86,22 @@ func (s *Server) Stop() {
 	}
 	s.Logger.Info("server stopped", "workers", len(s.workers))
 }
+
+func (s *Server) Notify(birthday *model.Birthday) error {
+	errs := []error{}
+	for _, service := range s.notificationServices {
+		err := service.Notify(birthday)
+		if err != nil {
+			errs = append(errs, err)
+		}
+	}
+
+	if len(errs) == 0 {
+		return nil
+	}
+	return errors.Join(errs...)
+}
+
+func (s *Server) Birthdays() []*model.Birthday {
+	return s.birthdays
+}

server/worker.go

@@ -7,14 +7,16 @@ import (
 )
 
 type Worker struct {
+	server  *Server
 	logger  *log.Logger
 	stop    chan bool
 	stopped chan bool
 }
 
-func NewWorker(logger *log.Logger) *Worker {
+func NewWorker(server *Server) *Worker {
 	return &Worker{
-		logger:  logger,
+		server:  server,
+		logger:  server.Logger,
 		stop:    make(chan bool, 1),
 		stopped: make(chan bool, 1),
 	}
@@ -39,6 +41,9 @@ func (w *Worker) run() {
 		select {
 		case t := <-ticker.C:
 			w.logger.Info("ticker ticked for worker", "tick", t)
+			// ToDo: improve logic here
+			b := w.server.Birthdays()[0]
+			w.server.Notify(b)
 		case <-w.stop:
 			w.logger.Info("received stop signal")
 			w.stopped <- true