ADD: added database connection for players data handling and started login funtion with database

backend/internal/auth/handler.go

@@ -1,8 +1,11 @@
 package auth
 
 import (
+	"database/sql"
 	"net/http"
 	"time"
+	"volleyball/internal/common"
+	"volleyball/internal/player"
 
 	"github.com/gin-gonic/gin"
 )
@@ -16,23 +19,53 @@ type LoginResponse struct {
 	Token string `json:"token"`
 }
 
-func LoginHandler(c *gin.Context) {
+func LoginHandler(c *gin.Context, db *sql.DB) {
 	var req LoginRequest
 	if err := c.ShouldBindJSON(&req); err != nil {
 		c.JSON(http.StatusBadRequest, gin.H{"error": "Bad request"})
 		return
 	}
 
-	// Systemnutzer
-	if req.Email == "test@localhost.de" {
-		token, err := CreateJWT("system-user-id", req.Email, "admin", time.Hour*24*7)
-		if err != nil {
-			c.JSON(http.StatusInternalServerError, gin.H{"error": "Token error"})
-			return
-		}
-		c.JSON(http.StatusOK, LoginResponse{Token: token})
+	// Validate input
+	if req.Email == "" || req.Password == "" {
+		c.JSON(http.StatusBadRequest, gin.H{"error": "Email and password are required"})
 		return
 	}
 
-	c.JSON(http.StatusUnauthorized, gin.H{"error": "Invalid credentials"})
+	// Systemnutzer
+	var token string
+	var err error
+	if req.Email == "test@localhost.de" {
+		token, err = CreateJWT("system-user-id", req.Email, "admin", 60*time.Minute)
+	} else {
+
+		hash, err := common.HashPassword(req.Password)
+		if err != nil {
+			c.JSON(http.StatusInternalServerError, gin.H{"error": "Password hashing error"})
+			return
+		}
+
+		loggedInPlayer, err := player.LoginPlayer(db, req.Email, string(hash))
+		if err != nil {
+			if err == sql.ErrNoRows {
+				c.JSON(http.StatusUnauthorized, gin.H{"error": "Invalid credentials"})
+				return
+			}
+			c.JSON(http.StatusInternalServerError, gin.H{"error": "Database error"})
+			return
+		}
+		// Create JWT token
+		token, err = CreateJWT(loggedInPlayer.ID, req.Email, "player", 60*time.Minute)
+		if err != nil {
+			c.JSON(http.StatusInternalServerError, gin.H{"error": "Token creation error"})
+			return
+		}
+	}
+
+	if err != nil {
+		c.JSON(http.StatusInternalServerError, gin.H{"error": "Token error"})
+		return
+	}
+	c.JSON(http.StatusOK, LoginResponse{Token: token})
+	return
 }