Add /user/{userId} (#24)

Closes #9

Reviewed-on: #24

backend/main.go

@@ -8,6 +8,7 @@ import (
 	"log"
 	"net/http"
 	"os"
+	"strconv"
 )
 
 //go:embed migrations/*.sql
@@ -30,18 +31,36 @@ func getUsers(c *gin.Context) {
 	c.IndentedJSON(http.StatusOK, users)
 }
 
-func main() {
-	config := ServerConfig{
-		Datasource: os.Getenv("DB_PATH"),
+func getUser(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
 	}
-	start(context.Background(), &config)
+
+	user, err := db.GetUser(userId)
+	if err != nil {
+		log.Printf("Error getting user: %v", err)
+		c.JSON(http.StatusInternalServerError, gin.H{"error": "Internal Server Error"})
+		return
+	}
+	if user == nil {
+		c.JSON(http.StatusNotFound, gin.H{"error": "User not found"})
+		return
+	}
+
+	c.IndentedJSON(http.StatusOK, user)
 }
 
 func start(ctx context.Context, config *ServerConfig) {
 	db = NewDb(config.Datasource)
 	defer db.db.MustClose()
+
 	router := gin.Default()
 	router.GET("/api/users", getUsers)
+	router.GET("/api/user/:userId", getUser)
 
 	srv := &http.Server{
 		Addr:    ":" + config.Port,
@@ -61,3 +80,10 @@ func start(ctx context.Context, config *ServerConfig) {
 		log.Fatalf("Server forced to shutdown: %v", err)
 	}
 }
+
+func main() {
+	config := ServerConfig{
+		Datasource: os.Getenv("DB_PATH"),
+	}
+	start(context.Background(), &config)
+}