Fix project selection and add project settings UI

internal/services/project.go

@@ -16,8 +16,9 @@ import (
 )
 
 var (
-	ErrProjectNotFound  = errors.New("project not found")
-	ErrProjectForbidden = errors.New("access to project forbidden")
+	ErrProjectNotFound   = errors.New("project not found")
+	ErrProjectForbidden  = errors.New("access to project forbidden")
+	ErrProjectNameExists = errors.New("project name already exists")
 )
 
 type ProjectService struct {
@@ -49,6 +50,9 @@ func (s *ProjectService) Create(ownerUsername string, req *CreateProjectRequest)
 	if name == "" {
 		return nil, fmt.Errorf("project name is required")
 	}
+	if err := s.ensureUniqueProjectName("", name); err != nil {
+		return nil, err
+	}
 
 	now := time.Now()
 	localProject := &localdb.LocalProject{
@@ -81,6 +85,9 @@ func (s *ProjectService) Update(projectUUID, ownerUsername string, req *UpdatePr
 	if name == "" {
 		return nil, fmt.Errorf("project name is required")
 	}
+	if err := s.ensureUniqueProjectName(projectUUID, name); err != nil {
+		return nil, err
+	}
 
 	localProject.Name = name
 	if req.TrackerURL != nil {
@@ -99,6 +106,32 @@ func (s *ProjectService) Update(projectUUID, ownerUsername string, req *UpdatePr
 	return localdb.LocalToProject(localProject), nil
 }
 
+func (s *ProjectService) ensureUniqueProjectName(excludeUUID, name string) error {
+	normalized := normalizeProjectName(name)
+	if normalized == "" {
+		return fmt.Errorf("project name is required")
+	}
+
+	projects, err := s.localDB.GetAllProjects(true)
+	if err != nil {
+		return err
+	}
+	for i := range projects {
+		project := projects[i]
+		if excludeUUID != "" && project.UUID == excludeUUID {
+			continue
+		}
+		if normalizeProjectName(project.Name) == normalized {
+			return ErrProjectNameExists
+		}
+	}
+	return nil
+}
+
+func normalizeProjectName(name string) string {
+	return strings.ToLower(strings.TrimSpace(name))
+}
+
 func (s *ProjectService) Archive(projectUUID, ownerUsername string) error {
 	return s.setProjectActive(projectUUID, ownerUsername, false)
 }