import requests
import json
import traceback
import sys  
import sap_utilities
from config_loader import CONFIG

###################################################
def login():
    session = requests.Session()
    
    sl_config = CONFIG.service_layer
    hana_config = CONFIG.hana
    
    body = {
        "CompanyDB": hana_config.company,
        "UserName": sl_config.username,
        "Password": sl_config.password
    }
    try:
        response = sap_utilities.post(session, "Login", body)
        if response:
            return session
    except Exception as e:
        print(f"❌ Error de conexión al SAP Service Layer (Login): {e}")
        tb = traceback.extract_tb(sys.exc_info()[2])
        print(tb[-1].name)
    return None

###################################################
def logout(session):
    try:
        response = sap_utilities.post(session, "Logout")
        if response:
            return True
    except Exception as e:
        print(f"❌ Error de desconexión del SAP Service Layer (Logout): {e}")
        tb = traceback.extract_tb(sys.exc_info()[2])
        print(tb[-1].name)
    return False

###################################################
def get_by_key(session, endpoint):

    if not session:
        print("❌ Error: No se pudo iniciar sesión en SAP Service Layer")
        return None
    
    recurso = endpoint
    
    response = sap_utilities.get(session, recurso)
    if response and response.status_code == 200:
        return response.json()
    
    print(f"❌ Error obteniendo datos de {recurso}")

    return None

###################################################
def update_document(session, recurso, body):

    if not session:
        print("❌ Error: No se pudo iniciar sesión en SAP Service Layer")
        return None
    
    # print(f"  📤 [PATCH] Body enviado a {recurso}:")
    # print(json.dumps(body, indent=2, default=str))
    response = sap_utilities.patch(session, recurso, body)
    if response and response.status_code == 204:
        return response
    
    status = response.status_code if response is not None else "Sin respuesta (None)"
    print(f"❌ Error actualizando documento en SAP Service Layer: HTTP {status}")

    return None    

###################################################