import json
import os
from datetime import datetime

def detect_language(text: str) -> str:
    if any(char in 'áéíóúñÁÉÍÓÚÑ¿¡' for char in text):
        return "es"
    return "en"

def save_history(history, filename="chat_history.json"):
    with open(filename, "w", encoding="utf-8") as f:
        json.dump(history, f, ensure_ascii=False, indent=2)

def load_history(filename="chat_history.json"):
    if os.path.exists(filename):
        with open(filename, "r", encoding="utf-8") as f:
            return json.load(f)
    return []