fix: prevent concurrent write to websocket connection

- refactor client handling and message broadcasting
- replace Client struct
- implement SendMessage method in Client struct for safer message sending
- update client map to use *models.Client instead of bool
- adjust BroadcastMessage and RunPomodoroTimer functions to use new client type

🤖

internal/websocket/client_commands.go

@@ -6,10 +6,22 @@ import (
 	"git.smsvc.net/pomodoro/GoTomato/pkg/models"
 	"github.com/gorilla/websocket"
 	"log"
+	"sync"
 )
 
+// Clients is a map of connected WebSocket clients, where each client is represented by the Client struct
+var Clients = make(map[*websocket.Conn]*models.Client)
+var mu sync.Mutex // Mutex to protect access to the Clients map
+
 // handleClientCommands listens for commands from WebSocket clients and dispatches to the timer.
 func handleClientCommands(ws *websocket.Conn) {
+	// Create a new Client and add it to the Clients map
+	mu.Lock()
+	Clients[ws] = &models.Client{
+		Conn: ws,
+	}
+	mu.Unlock()
+
 	for {
 		_, message, err := ws.ReadMessage()
 		if err != nil {