diff --git a/main.py b/main.py
index 642e813..16d7a00 100644
--- a/main.py
+++ b/main.py
@@ -1,3 +1,12 @@
+"""akun default buat login :
+    - admin / admin123  (role admin)
+    - kasir / kasir123 (role kasir)
+    - waiter / waiter123 (role waiter)
+    - user / user123 (role pembeli)
+    - owner / owner123 (role pemilik)
+"""
+
+
 import sqlite3
 import os
 import tkinter as tk
@@ -9,6 +18,8 @@ IMG_PREVIEW_SIZE = (120, 80)
 
 
 
+
+
 # Baguan Database (ati ati)
 
 
@@ -51,9 +62,9 @@ def seed_defaults(conn):
     c = conn.cursor()
     defaults = [
         ('admin','admin123','admin'),
-        ('kasir1','kasir123','kasir'),
-        ('waiter1','waiter123','waiter'),
-        ('user1','user123','pembeli'),
+        ('kasir','kasir123','kasir'),
+        ('waiter','waiter123','waiter'),
+        ('user','user123','pembeli'),
         ('owner','owner123','pemilik'),
     ]
     for u,p,r in defaults:
@@ -81,4 +92,97 @@ def seed_defaults(conn):
             c.execute("INSERT INTO promo (code,type,value,min_total) VALUES (?,?,?,?)", (code,ptype,val,min_total))
         except sqlite3.IntegrityError:
             pass
-    conn.commit()
\ No newline at end of file
+    conn.commit()
+
+def authenticate(username, password):
+    conn = sqlite3.connect(DB_PATH)
+    c = conn.cursor()
+    c.execute("SELECT id,username,role FROM users WHERE username=? AND password=?", (username,password))
+    r = c.fetchone()
+    conn.close()
+    if r:
+        return {'id':r[0],'username':r[1],'role':r[2]}
+    return None
+
+
+
+
+
+
+
+# Bagian Menu wel
+
+
+def menu_add(nama, kategori, harga, stok, foto, item_discount_pct=0):
+    conn = sqlite3.connect(DB_PATH)
+    c = conn.cursor()
+    tersedia = 1 if stok>0 else 0
+    c.execute("""INSERT INTO menu (nama,kategori,harga,stok,foto,tersedia,item_discount_pct)
+                VALUES (?,?,?,?,?,?,?)""", (nama,kategori,harga,stok,foto,tersedia,item_discount_pct))
+    conn.commit()
+    conn.close()
+
+def menu_update(menu_id, nama, kategori, harga, stok, foto, item_discount_pct=0):
+    conn = sqlite3.connect(DB_PATH)
+    c = conn.cursor()
+    tersedia = 1 if stok>0 else 0
+    c.execute("""UPDATE menu SET nama=?,kategori=?,harga=?,stok=?,foto=?,tersedia=?,item_discount_pct=?
+                WHERE id=?""", (nama,kategori,harga,stok,foto,tersedia,item_discount_pct, menu_id))
+    conn.commit()
+    conn.close()
+
+def menu_delete(menu_id):
+    conn = sqlite3.connect(DB_PATH)
+    c = conn.cursor()
+    c.execute("DELETE FROM menu WHERE id=?", (menu_id,))
+    conn.commit()
+    conn.close()
+
+def menu_list(kategori=None, available_only=False, search_text=None):
+    conn = sqlite3.connect(DB_PATH)
+    c = conn.cursor()
+    q = "SELECT id,nama,kategori,harga,stok,foto,tersedia,item_discount_pct FROM menu"
+    conditions = []
+    params = []
+    if kategori:
+        conditions.append("kategori=?")
+        params.append(kategori)
+    if available_only:
+        conditions.append("tersedia=1")
+    if search_text:
+        conditions.append("(nama LIKE ? OR kategori LIKE ?)")
+        params += [f"%{search_text}%", f"%{search_text}%"]
+    if conditions:
+        q += " WHERE " + " AND ".join(conditions)
+    q += " ORDER BY id ASC"
+    c.execute(q, params)
+    rows = c.fetchall()
+    conn.close()
+    return rows
+
+def menu_get(menu_id):
+    conn = sqlite3.connect(DB_PATH)
+    c = conn.cursor()
+    c.execute("SELECT id,nama,kategori,harga,stok,foto,tersedia,item_discount_pct FROM menu WHERE id=?", (menu_id,))
+    r = c.fetchone()
+    conn.close()
+    return r
+
+def menu_decrease_stock(menu_id, qty):
+    conn = sqlite3.connect(DB_PATH)
+    c = conn.cursor()
+    c.execute("SELECT stok FROM menu WHERE id=?", (menu_id,))
+    r = c.fetchone()
+    if not r:
+        conn.close()
+        return False, "Menu tidak ditemukan"
+    stok = r[0]
+    if stok < qty:
+        conn.close()
+        return False, "Stok tidak cukup"
+    newstok = stok - qty
+    tersedia = 1 if newstok>0 else 0
+    c.execute("UPDATE menu SET stok=?, tersedia=? WHERE id=?", (newstok, tersedia, menu_id))
+    conn.commit()
+    conn.close()
+    return True, newstok
\ No newline at end of file