Implement get goals (#25)

Closes #13

Reviewed-on: #25

backend/main.go

@@ -15,10 +15,18 @@ import (
 var migrations embed.FS
 var db *Db
 
+// ServerConfig holds configuration for the server.
 type ServerConfig struct {
+	// The datasource to the SQLite database.
+	// Use ":memory:" for an in-memory database.
 	Datasource string
-	Port       string
-	Started    chan bool
+
+	// The port to listen on.
+	// Use an empty string to listen on a random port.
+	Port string
+
+	// The channel that gets signaled when the server has started.
+	Started chan bool
 }
 
 func getUsers(c *gin.Context) {
@@ -54,6 +62,41 @@ func getUser(c *gin.Context) {
 	c.IndentedJSON(http.StatusOK, user)
 }
 
+func getUserGoals(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
+	}
+
+	exists, err := db.UserExists(userId)
+	if err != nil {
+		log.Printf("Error checking user existence: %v", err)
+		c.JSON(http.StatusInternalServerError, gin.H{"error": "Internal Server Error"})
+		return
+	}
+	if !exists {
+		log.Printf("Error checking user existence: %v", err)
+		c.JSON(http.StatusNotFound, gin.H{"error": "User not found"})
+		return
+	}
+
+	goals, err := db.GetUserGoals(userId)
+	if err != nil {
+		log.Printf("Error getting user goals: %v", err)
+		c.JSON(http.StatusInternalServerError, gin.H{"error": "Internal Server Error"})
+		return
+	}
+	c.IndentedJSON(http.StatusOK, goals)
+}
+
+/*
+*
+Initialises the database, and then starts the server.
+If the context gets cancelled, the server is shutdown and the database is closed.
+*/
 func start(ctx context.Context, config *ServerConfig) {
 	db = NewDb(config.Datasource)
 	defer db.db.MustClose()
@@ -61,6 +104,7 @@ func start(ctx context.Context, config *ServerConfig) {
 	router := gin.Default()
 	router.GET("/api/users", getUsers)
 	router.GET("/api/user/:userId", getUser)
+	router.GET("/api/user/:userId/goals", getUserGoals)
 
 	srv := &http.Server{
 		Addr:    ":" + config.Port,
@@ -73,7 +117,9 @@ func start(ctx context.Context, config *ServerConfig) {
 	}()
 
 	log.Printf("Running server on port %s\n", config.Port)
-	config.Started <- true
+	if config.Started != nil {
+		config.Started <- true
+	}
 	<-ctx.Done()
 	log.Println("Shutting down")
 	if err := srv.Shutdown(context.Background()); err != nil {