feat: ingredient controller, websocket messages, ingredient controller tests

server/src/main/java/server/api/IngredientController.java

@@ -0,0 +1,205 @@
+package server.api;
+
+import commons.Ingredient;
+import commons.ws.Topics;
+import commons.ws.messages.CreateIngredientMessage;
+import commons.ws.messages.DeleteIngredientMessage;
+import commons.ws.messages.UpdateIngredientMessage;
+import org.springframework.data.domain.Example;
+import org.springframework.data.domain.PageRequest;
+import org.springframework.http.ResponseEntity;
+import org.springframework.messaging.simp.SimpMessagingTemplate;
+import org.springframework.web.bind.annotation.DeleteMapping;
+import org.springframework.web.bind.annotation.GetMapping;
+import org.springframework.web.bind.annotation.PatchMapping;
+import org.springframework.web.bind.annotation.PathVariable;
+import org.springframework.web.bind.annotation.PostMapping;
+import org.springframework.web.bind.annotation.RequestBody;
+import org.springframework.web.bind.annotation.RequestMapping;
+import org.springframework.web.bind.annotation.RequestParam;
+import org.springframework.web.bind.annotation.RestController;
+import server.database.IngredientRepository;
+
+import java.util.Optional;
+import java.util.List;
+
+/**
+ * REST controller for managing ingredients.
+ * <p>
+ * Exposes the following endpoints:
+ * <ul>
+ *   <li>GET /api/ingredients - Get a list of ingredients, optionally paginated.</li>
+ *   <li>GET /api/ingredients/{id} - Get a specific ingredient by its ID.</li>
+ *   <li>POST /api/ingredients - Create a new ingredient.</li>
+ *   <li>PATCH /api/ingredients/{id} - Update an existing ingredient by its ID.</li>
+ *   <li>DELETE /api/ingredients/{id} - Delete an ingredient by its ID.</li>
+ * </ul>
+ * </p>
+ *
+ * @see Ingredient
+ * @see IngredientRepository
+ */
+@RestController
+@RequestMapping("/api")
+public class IngredientController {
+    private final IngredientRepository ingredientRepository;
+    private final SimpMessagingTemplate messagingTemplate;
+
+    public IngredientController(IngredientRepository ingredientRepository,
+                                SimpMessagingTemplate messagingTemplate) {
+        this.ingredientRepository = ingredientRepository;
+        this.messagingTemplate = messagingTemplate;
+    }
+
+    /**
+     * Get a list of ingredients, optionally paginated. <br />
+     * Maps to <code>GET /api/ingredients(?page=&limit=)</code>
+     * <p>
+     * If no limit is specified, all ingredients are returned sorted by name ascending.
+     * When calling this function, consider using pagination to avoid large responses.
+     * </p>
+     *
+     * <p>
+     * When using pagination, you should provide a limit.
+     * The page defaults to 0 if not provided.
+     * </p>
+     *
+     * @param page The page number to retrieve (0-indexed). Optional.
+     * @param limit The maximum number of ingredients to return. Optional.
+     * @return A ResponseEntity containing the list of ingredients.
+     *
+     * @see Ingredient
+     */
+    @GetMapping("/ingredients")
+    public ResponseEntity<List<Ingredient>> getIngredients(
+            @RequestParam Optional<Integer> page,
+            @RequestParam Optional<Integer> limit
+    ) {
+        List<Ingredient> ingredients = limit
+                .map(l -> {
+                    return ingredientRepository.findAllByOrderByNameAsc
+(PageRequest.of(page.orElse(0), l)).toList();
+                })
+                .orElseGet(ingredientRepository::findAllByOrderByNameAsc);
+
+        return ResponseEntity.ok(ingredients);
+    }
+
+    /**
+     * Get a specific ingredient by its ID.
+     * Maps to <code>GET /api/ingredients/{id}</code>
+     *
+     * <p>
+     * Returns 200 OK with the ingredient if found,
+     * or 404 Not Found if the ingredient does not exist.
+     * </p>
+     *
+     * @param id The ID of the ingredient to retrieve.
+     * @return The ingredient wrapped in a ResponseEntity.
+     *
+     * @see Ingredient
+     */
+    @GetMapping("/ingredients/{id}")
+    public ResponseEntity<Ingredient> getIngredientById(@PathVariable Long id) {
+        return ingredientRepository.findById(id)
+                .map(ResponseEntity::ok)
+                .orElseGet(() -> ResponseEntity.notFound().build());
+    }
+
+    /**
+     * Update an existing ingredient by its ID.
+     * Maps to <code>PATCH /api/ingredients/{id}</code>
+     *
+     * <p>
+     * If the ingredient with the specified ID does not exist,
+     * returns 404 Not Found.
+     * <p>
+     * If the ingredient exists, updates it with the provided data
+     * and returns the updated ingredient with 200 OK.
+     * </p>
+     *
+     * @param id The ID of the ingredient to update.
+     * @param updated The updated ingredient data.
+     * @return The updated ingredient wrapped in a ResponseEntity.
+     *
+     * @see Ingredient
+     */
+    @PatchMapping("/ingredients/{id}")
+    public ResponseEntity<Ingredient> updateIngredient(
+            @PathVariable Long id,
+            @RequestBody Ingredient updated
+    ) {
+        if (!ingredientRepository.existsById(id)) {
+            return ResponseEntity.notFound().build();
+        }
+
+        // TODO: Refactor to use setters
+        updated.id = id;
+        Ingredient savedIngredient = ingredientRepository.save(updated);
+        messagingTemplate.convertAndSend(Topics.INGREDIENTS, new CreateIngredientMessage(savedIngredient));
+
+        return ResponseEntity.ok(savedIngredient);
+    }
+
+    /**
+     * Create a new ingredient.
+     * Maps to <code>POST /api/ingredients</code>
+     *
+     * <p>
+     * If an ingredient with the same name already exists,
+     * returns 400 Bad Request.
+     *
+     * If the ingredient is created successfully,
+     * returns the created ingredient with 200 OK.
+     * </p>
+     *
+     * @param ingredient The ingredient to create.
+     * @return The created ingredient wrapped in a ResponseEntity.
+     *
+     * @see Ingredient
+     */
+    @PostMapping("/ingredients")
+    public ResponseEntity<Ingredient> createIngredient(@RequestBody Ingredient ingredient) {
+        if (ingredient.name == null || ingredient.name.isEmpty()) {
+            return ResponseEntity.badRequest().build();
+        }
+
+        Ingredient example = new Ingredient();
+        example.name = ingredient.name;
+
+        if (ingredientRepository.exists(Example.of(example))) {
+            return ResponseEntity.badRequest().build();
+        }
+
+        Ingredient saved = ingredientRepository.save(ingredient);
+        messagingTemplate.convertAndSend(Topics.INGREDIENTS, new UpdateIngredientMessage(saved));
+
+        return ResponseEntity.ok(saved);
+    }
+
+    /**
+     * Delete an ingredient by its ID.
+     * Maps to <code>DELETE /api/ingredients/{id}</code>
+     *
+     * <p>
+     * Returns 404 Not Found if the ingredient does not exist.
+     * If the ingredient is deleted successfully, returns 200 OK with true.
+     * </p>
+     *
+     * @param id The ID of the ingredient to delete.
+     * @return A ResponseEntity indicating the result of the operation.
+     *
+     * @see Ingredient
+     */
+    @DeleteMapping("/ingredients/{id}")
+    public ResponseEntity<Boolean> deleteIngredient(@PathVariable Long id) {
+        if (!ingredientRepository.existsById(id)) {
+            return ResponseEntity.notFound().build();
+        }
+
+        ingredientRepository.deleteById(id);
+        messagingTemplate.convertAndSend(Topics.INGREDIENTS, new DeleteIngredientMessage(id));
+
+        return ResponseEntity.ok(true);
+    }
+}

server/src/main/java/server/api/RecipeController.java

@@ -32,7 +32,8 @@ public class RecipeController {
     private final RecipeRepository recipeRepository; // JPA repository used in this controller
     private final SimpMessagingTemplate messagingTemplate;
 
-    public RecipeController(RecipeRepository recipeRepository, SimpMessagingTemplate messagingTemplate) {
+    public RecipeController(RecipeRepository recipeRepository,
+                            SimpMessagingTemplate messagingTemplate) {
         this.recipeRepository = recipeRepository;
         this.messagingTemplate = messagingTemplate;
     }

server/src/main/java/server/api/UpdateMessagingController.java

@@ -1,6 +1,7 @@
 package server.api;
 
 import commons.Recipe;
+import commons.ws.Topics;
 import org.springframework.beans.factory.annotation.Autowired;
 import org.springframework.http.ResponseEntity;
 import org.springframework.messaging.handler.annotation.MessageMapping;
@@ -22,7 +23,7 @@ public class UpdateMessagingController {
      * @return The updated {@link Recipe} object wrapped in a {@link org.springframework.http.ResponseEntity}.
      */
     @MessageMapping("/updates/recipe")
-    @SendTo("/subscribe/recipe")
+    @SendTo(Topics.RECIPES)
     public ResponseEntity<Recipe> broadcastRecipeUpdate(Recipe recipe) {
         return recipeController.updateRecipe(recipe.getId(), recipe);
     }

server/src/main/java/server/database/IngredientRepository.java

@@ -1,11 +1,14 @@
-package server;
+package server.database;
 
 import commons.Ingredient;
+import org.springframework.data.domain.Page;
+import org.springframework.data.domain.Pageable;
 import org.springframework.data.jpa.repository.JpaRepository;
 
 import java.util.List;
 
 public interface IngredientRepository extends JpaRepository<Ingredient, Long> {
     List<Ingredient> findAllByOrderByNameAsc();
+    Page<Ingredient> findAllByOrderByNameAsc(Pageable pageable);
 }
 

server/src/main/java/server/database/RecipeIngredientRepository.java

@@ -1,4 +1,4 @@
-package server;
+package server.database;
 
 import commons.RecipeIngredient;
 import org.springframework.data.jpa.repository.JpaRepository;