Add endpoint to get allowance history (#37)

Closes #12

Reviewed-on: #37

backend/main.go

@@ -185,7 +185,7 @@ func deleteUserGoal(c *gin.Context) {
 		return
 	}
 
-	c.JSON(http.StatusOK, gin.H{"message": "Goal deleted successfully"})
+	c.IndentedJSON(http.StatusOK, gin.H{"message": "Goal deleted successfully"})
 }
 
 func createTask(c *gin.Context) {
@@ -233,7 +233,7 @@ func getTasks(c *gin.Context) {
 		c.JSON(http.StatusInternalServerError, gin.H{"error": ErrInternalServerError})
 		return
 	}
-	c.JSON(http.StatusOK, &response)
+	c.IndentedJSON(http.StatusOK, &response)
 }
 
 func getTask(c *gin.Context) {
@@ -325,8 +325,26 @@ func postAllowance(c *gin.Context) {
 	c.JSON(http.StatusOK, gin.H{"message": "Allowance updated successfully"})
 }
 
+func getHistory(c *gin.Context) {
+	userIdStr := c.Param("userId")
+	userId, err := strconv.Atoi(userIdStr)
+	if err != nil {
+		log.Printf("Invalid user ID: %v", err)
+		c.JSON(http.StatusBadRequest, gin.H{"error": "Invalid user ID"})
+		return
+	}
+
+	history, err := db.GetHistory(userId)
+	if err != nil {
+		log.Printf("Error getting history: %v", err)
+		c.JSON(http.StatusInternalServerError, gin.H{"error": ErrInternalServerError})
+		return
+	}
+
+	c.IndentedJSON(http.StatusOK, history)
+}
+
 /*
-*
 Initialises the database, and then starts the server.
 If the context gets cancelled, the server is shutdown and the database is closed.
 */
@@ -337,6 +355,8 @@ func start(ctx context.Context, config *ServerConfig) {
 	router := gin.Default()
 	router.GET("/api/users", getUsers)
 	router.GET("/api/user/:userId", getUser)
+	router.POST("/api/user/:userId/allowance", postAllowance)
+	router.GET("/api/user/:userId/history", getHistory)
 	router.GET("/api/user/:userId/goals", getUserGoals)
 	router.POST("/api/user/:userId/goals", createUserGoal)
 	router.DELETE("/api/user/:userId/goal/:goalId", deleteUserGoal)
@@ -344,7 +364,6 @@ func start(ctx context.Context, config *ServerConfig) {
 	router.GET("/api/tasks", getTasks)
 	router.GET("/api/task/:taskId", getTask)
 	router.PUT("/api/task/:taskId", putTask)
-	router.POST("/api/user/:userId/allowance", postAllowance)
 
 	srv := &http.Server{
 		Addr:    config.Addr,