Add put task endpoint (#33)

Closes #23

Reviewed-on: #33

backend/api_test.go

@@ -357,3 +357,31 @@ func TestGetTaskBadId(t *testing.T) {
 	createTestTask(e)
 	e.GET("/task/invalid").Expect().Status(400)
 }
+
+func TestPutTaskModifiesTask(t *testing.T) {
+	e := startServer(t)
+	createTestTask(e)
+	requestBody := map[string]interface{}{
+		"name":   "Updated Task",
+		"reward": 100,
+	}
+	e.PUT("/task/1").WithJSON(requestBody).Expect().
+		Status(200).
+		JSON().Object()
+
+	// Verify the task is updated
+	result := e.GET("/task/1").Expect().Status(200).JSON().Object()
+	result.Value("id").IsEqual(1)
+	result.Value("name").IsEqual("Updated Task")
+	result.Value("reward").IsEqual(100)
+}
+
+func TestPutTaskInvalidTaskId(t *testing.T) {
+	e := startServer(t)
+	createTestTask(e)
+
+	requestBody := map[string]interface{}{
+		"name": "Updated Task",
+	}
+	e.PUT("/task/999").WithJSON(requestBody).Expect().Status(404)
+}

backend/db.go

@@ -102,7 +102,7 @@ func (db *Db) CreateGoal(userId int, goal *CreateGoalRequest) (int, error) {
 	if err != nil {
 		return 0, err
 	}
-	defer tx.Rollback()
+	defer tx.MustRollback()
 
 	// Insert the new goal
 	err = tx.Query("insert into goals (user_id, name, target, progress, weight) values (?, ?, ?, 0, ?)").
@@ -156,7 +156,7 @@ func (db *Db) CreateTask(task *CreateTaskRequest) (int, error) {
 	if err != nil {
 		return 0, err
 	}
-	defer tx.Rollback()
+	defer tx.MustRollback()
 
 	// Insert the new task
 	err = tx.Query("insert into tasks (name, reward, assigned) values (?, ?, ?)").
@@ -211,3 +211,29 @@ func (db *Db) GetTask(id int) (Task, error) {
 	}
 	return task, nil
 }
+
+func (db *Db) HasTask(id int) (bool, error) {
+	count := 0
+	err := db.db.Query("select count(*) from tasks where id = ?").
+		Bind(id).ScanSingle(&count)
+	if err != nil {
+		return false, err
+	}
+	return count > 0, nil
+}
+
+func (db *Db) UpdateTask(id int, task *CreateTaskRequest) error {
+	tx, err := db.db.Begin()
+	if err != nil {
+		return err
+	}
+	defer tx.MustRollback()
+
+	err = tx.Query("update tasks set name=?, reward=?, assigned=? where id = ?").
+		Bind(task.Name, task.Reward, task.Assigned, id).
+		Exec()
+	if err != nil {
+		return err
+	}
+	return tx.Commit()
+}

backend/dto.go

@@ -36,14 +36,12 @@ type CreateGoalResponse struct {
 	ID int `json:"id"`
 }
 
-// CreateTaskRequest represents the request body for creating a new task.
 type CreateTaskRequest struct {
 	Name     string `json:"name" binding:"required"`
 	Reward   int    `json:"reward"`
 	Assigned *int   `json:"assigned"`
 }
 
-// CreateTaskResponse represents the response body after creating a new task.
 type CreateTaskResponse struct {
 	ID int `json:"id"`
 }

backend/main.go

@@ -257,6 +257,38 @@ func getTask(c *gin.Context) {
 	c.JSON(http.StatusOK, &response)
 }
 
+func putTask(c *gin.Context) {
+	taskIdStr := c.Param("taskId")
+	taskId, err := strconv.Atoi(taskIdStr)
+	if err != nil {
+		log.Printf("Invalid task ID: %v", err)
+		c.JSON(http.StatusBadRequest, gin.H{"error": "Invalid task ID"})
+		return
+	}
+
+	var taskRequest CreateTaskRequest
+	if err := c.ShouldBindJSON(&taskRequest); err != nil {
+		log.Printf("Error parsing request body: %v", err)
+		c.JSON(http.StatusBadRequest, gin.H{"error": "Invalid request body"})
+		return
+	}
+
+	_, err = db.GetTask(taskId)
+	if errors.Is(err, mysqlite.ErrNoRows) {
+		c.JSON(http.StatusNotFound, gin.H{"error": "Task not found"})
+		return
+	}
+
+	err = db.UpdateTask(taskId, &taskRequest)
+	if err != nil {
+		log.Printf("Error updating task: %v", err)
+		c.JSON(http.StatusInternalServerError, gin.H{"error": ErrInternalServerError})
+		return
+	}
+
+	c.JSON(http.StatusOK, gin.H{"message": "Task updated successfully"})
+}
+
 /*
 *
 Initialises the database, and then starts the server.
@@ -275,6 +307,7 @@ func start(ctx context.Context, config *ServerConfig) {
 	router.POST("/api/tasks", createTask)
 	router.GET("/api/tasks", getTasks)
 	router.GET("/api/task/:taskId", getTask)
+	router.PUT("/api/task/:taskId", putTask)
 
 	srv := &http.Server{
 		Addr:    config.Addr,