from hdbcli import dbapi
from config_loader import CONFIG

###################################################
def get_connection(schema):
    """Crea y retorna una conexión a SAP HANA."""
    try:
        conn = dbapi.connect(
            address=CONFIG.hana.server,
            port=CONFIG.hana.port,
            user=CONFIG.hana.user,
            password=CONFIG.hana.password
        )
        return conn
    except Exception as e:
        print(f"❌ Error conectando a HANA para {schema}: {e}")
        return None

###################################################
def obtener_registros():
    """
    Obtiene los documentos de los ultimos 'days' dias
    Args:
        company: Objeto con la configuracion de la base de datos
        days: Numero de dias a consultar, entero positivo
    Returns:
        Lista de diccionarios con los documentos encontrados
    Raises:
        Exception: Si hay un error conectando a la base de datos
    Example:
        where DocDate >= ADD_DAYS(CURRENT_DATE, -{days})
    """
    hana_config = CONFIG.hana

    db_name = hana_config.company

    conn = get_connection(db_name)
    if not conn:
        return []

    query = f"""
    SELECT T0."DocEntry", T0."DocNum", T0."ObjType", T2."USER_CODE" "UserCode" 
    FROM "{db_name}".ORDR T0 
    INNER JOIN "{db_name}".OUSR T2 ON T2."USERID" = T0."UserSign"
    WHERE T0."CANCELED" = 'N' AND T0."DocStatus" = 'O' 
    AND T0."DocType" = 'I' 
    AND IFNULL("U_SIS_IMPAUT",'N') = 'Y'
    AND IFNULL("U_SIS_VIGREQ",'') <> ''
    AND TO_VARCHAR(T0."CreateDate",'YYYYMMDD') = '20260528'
    """

    try:
        cursor = conn.cursor()
        cursor.execute(query)
        
        # Obtener nombres de columnas
        columns = [column[0] for column in cursor.description]
        
        # Convertir resultados a lista de diccionarios
        results = []
        for row in cursor.fetchall():
            results.append(dict(zip(columns, row)))
            
        cursor.close()
        conn.close()
        
        print(f"📄 Se encontraron {len(results)} documentos para procesar.")
        return results
        
    except Exception as e:
        print(f"❌ Error ejecutando la consulta en HANA: {e}")
        if 'conn' in locals():
            conn.close()
        return []

###################################################
def obtener_lotes_disponibles(itemcode:str,whscode:str):
    hana_config = CONFIG.hana
    
    db_name = hana_config.company

    conn = get_connection(db_name)
    if not conn:
        return []

    query = f"""
    SELECT T0."DistNumber", TO_VARCHAR(T0."InDate",'YYYY-MM-DD') "InDate",
    TO_VARCHAR(T0."ExpDate",'YYYY-MM-DD') "ExpDate", 
    T0."AbsEntry", T1."WhsCode", T1."Quantity", T1."CommitQty",
    FLOOR(MONTHS_BETWEEN(CURRENT_DATE, T0."ExpDate")) "Months"
    FROM "{db_name}".OBTN T0
    INNER JOIN "{db_name}".OBTQ T1 ON T1."MdAbsEntry" = T0."AbsEntry"
    WHERE T0."ItemCode" = '{itemcode}'
    AND T1."WhsCode" = '{whscode}'
    AND T1."Quantity" > 0.00
    """

    try:
        cursor = conn.cursor()
        cursor.execute(query)
        
        # Obtener nombres de columnas
        columns = [column[0] for column in cursor.description]
        
        # Convertir resultados a lista de diccionarios
        results = []
        for row in cursor.fetchall():
            results.append(dict(zip(columns, row)))
            
        cursor.close()
        conn.close()
        
        return results
        
    except Exception as e:
        print(f"❌ Error ejecutando la consulta en HANA: {e}")
        if 'conn' in locals():
            conn.close()
        return []

###################################################
def obtener_presentacion_articulo(itemcode):
    hana_config = CONFIG.hana
    
    db_name = hana_config.company

    conn = get_connection(db_name)
    if not conn:
        return []

    query = f"""
    SELECT IFNULL(T0."U_SIS_PRECAJ",'100') "Presentacion"
    FROM "{db_name}".OITM T0
    WHERE T0."ItemCode" = '{itemcode}'
    """

    try:
        cursor = conn.cursor()
        cursor.execute(query)
        
        presentacion = cursor.fetchone()[0]
            
        cursor.close()
        conn.close()
        
        return presentacion
        
    except Exception as e:
        print(f"❌ Error ejecutando la consulta en HANA: {e}")
        if 'conn' in locals():
            conn.close()
        return None

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