another big refactor to make code more manageable

backend/servermanager.go

@@ -0,0 +1,41 @@
+package backend
+
+import (
+	"net/http"
+
+	subsonic "github.com/dweymouth/go-subsonic"
+	"github.com/google/uuid"
+)
+
+type ServerManager struct {
+	ServerID uuid.UUID
+	Server   *subsonic.Client
+
+	onServerConnected []func()
+}
+
+func NewServerManager() *ServerManager {
+	return &ServerManager{}
+}
+
+func (s *ServerManager) ConnectToServer(conf *ServerConfig, password string) error {
+	cli := &subsonic.Client{
+		Client:     &http.Client{},
+		BaseUrl:    conf.Hostname,
+		User:       conf.Username,
+		ClientName: "supersonic",
+	}
+	if err := cli.Authenticate(password); err != nil {
+		return err
+	}
+	s.Server = cli
+	s.ServerID = conf.ID
+	for _, cb := range s.onServerConnected {
+		cb()
+	}
+	return nil
+}
+
+func (s *ServerManager) OnServerConnected(cb func()) {
+	s.onServerConnected = append(s.onServerConnected, cb)
+}