Establishes active scope persistence

Refactors the global controller advice to separately manage all available scopes and the active scope ID. The active scope is now determined from a `cosmos-scope-id` cookie.

Introduces a new endpoint to handle Htmx requests from the scope selection dropdown, storing the chosen scope ID in the `cosmos-scope-id` cookie.

Updates the navigation fragment to use the new endpoint for setting the active scope and pre-selects the dropdown based on the value retrieved from the cookie. This allows the user's active scope selection to persist across requests.

Author: aks8m

src/main/java/dev/ikm/server/cosmos/global/GlobalControllerAdvice.java

@@ -1,10 +1,15 @@
 package dev.ikm.server.cosmos.global;
 
+import dev.ikm.server.cosmos.scope.ScopeDTO;
 import dev.ikm.server.cosmos.scope.ScopeService;
 import org.springframework.ui.Model;
 import org.springframework.web.bind.annotation.ControllerAdvice;
+import org.springframework.web.bind.annotation.CookieValue;
 import org.springframework.web.bind.annotation.ModelAttribute;
 
+import java.util.List;
+import java.util.UUID;
+
 @ControllerAdvice
 public class GlobalControllerAdvice {
 
@@ -14,12 +19,14 @@ public GlobalControllerAdvice(ScopeService scopeService) {
 		this.scopeService = scopeService;
 	}
 
-	@ModelAttribute
-	public void addGlobalAttributes(Model model) {
-		// This ensures 'scopes' is available on every page for the navigation dropdown
-		model.addAttribute("scopes", scopeService.retrieveAllScopes());
+	@ModelAttribute("scopes")
+	public List<ScopeDTO> addScopesToModel() {
+		return scopeService.retrieveAllScopes();
+	}
 
-		// You can also handle 'activeScope' here if it's stored in the session
-		// or determine it based on the request
+	@ModelAttribute("activeScopeId")
+	public UUID addScopeSelectionToModel(
+			@CookieValue(name = "cosmos-scope-id", defaultValue = "none") String scopeSelectionId) {
+		return UUID.fromString(scopeSelectionId);
 	}
 }

src/main/java/dev/ikm/server/cosmos/scope/ScopeController.java

@@ -2,16 +2,20 @@
 
 import dev.ikm.server.cosmos.api.coordinate.CoordinateService;
 import io.github.wimdeblauwe.htmx.spring.boot.mvc.HxRequest;
+import jakarta.servlet.http.Cookie;
+import jakarta.servlet.http.HttpServletResponse;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.http.ResponseEntity;
 import org.springframework.stereotype.Controller;
 import org.springframework.ui.Model;
 import org.springframework.web.bind.annotation.DeleteMapping;
 import org.springframework.web.bind.annotation.GetMapping;
 import org.springframework.web.bind.annotation.ModelAttribute;
 import org.springframework.web.bind.annotation.PathVariable;
 import org.springframework.web.bind.annotation.PostMapping;
+import org.springframework.web.bind.annotation.RequestParam;
 import org.springframework.web.bind.annotation.ResponseBody;
 import org.springframework.web.servlet.view.FragmentsRendering;
 
@@ -93,6 +97,15 @@ public FragmentsRendering postScope(@ModelAttribute("scopeForm") ScopeFormDTO sc
 				.build();
 	}
 
+	@HxRequest
+	@PostMapping("/scope/selected")
+	public ResponseEntity<Void> postSelectedScope(@RequestParam("scopeId") UUID id, HttpServletResponse response, Model model) {
+		Cookie cookie = new Cookie("cosmos-scope-id", id.toString());
+		cookie.setPath("/");
+		response.addCookie(cookie);
+		return ResponseEntity.noContent().build();
+	}
+
 	@HxRequest
 	@DeleteMapping("/scope/{id}")
 	@ResponseBody

src/main/resources/templates/fragments/layout/navigation.html

@@ -90,12 +90,14 @@
                     <ul class="navbar-nav ms-auto">
                         <li class="nav-item">
                             <div data-bs-theme="dark">
-                            <select class="form-select" id="scopeSelect" name="scopeId" aria-label="Select Scope">
-                                <option value="" th:selected="${activeScope == null}">Select Scope</option>
+                            <select class="form-select" id="scopeSelect" name="scopeId" aria-label="Select Scope"
+                                    hx-post="/scope/selected"
+                                    hx-trigger="change">
+                                <option value="" th:selected="${activeScopeId == null}">Select Scope</option>
                                 <option th:each="scope : ${scopes}"
                                         th:value="${scope.id()}"
                                         th:text="${scope.name()}"
-                                        th:selected="${activeScope != null and activeScope.id == scope.id}">Scope Name</option>
+                                        th:selected="${activeScopeId != null and activeScopeId == scope.id()}">Scope Name</option>
                             </select>
                             </div>
                         </li>