import requests
import datetime
import json
import os
import time
from dateutil import parser
from zoneinfo import ZoneInfo

# --- CONFIGURAZIONE UTENTE ---
TELEGRAM_BOT_TOKEN = "8155587974:AAF9OekvBpixtk8ZH6KoIc0L8edbhdXt7A4"
TELEGRAM_CHAT_IDS = ["64463169", "24827341", "132455422", "5405962012"]

# --- COORDINATE (Strada Cà Toro, 12 - San Marino) ---
LAT = 43.9356
LON = 12.4296
LOCATION_NAME = "🏠 Casa (Strada Cà Toro)"

# Soglia Gelo (°C)
SOGLIA_GELO = 0.0

# File di stato
STATE_FILE = "/home/daniely/docker/telegram-bot/freeze_state.json"

def load_state():
    if os.path.exists(STATE_FILE):
        try:
            with open(STATE_FILE, 'r') as f: return json.load(f)
        except: pass
    return {"alert_active": False, "min_temp": 100.0}

def save_state(active, min_temp):
    try:
        with open(STATE_FILE, 'w') as f: 
            json.dump({"alert_active": active, "min_temp": min_temp, "updated": str(datetime.datetime.now())}, f)
    except: pass

def send_telegram_message(message):
    if not TELEGRAM_BOT_TOKEN or "INSERISCI" in TELEGRAM_BOT_TOKEN:
        print(f"[TEST OUT] {message}")
        return

    url = f"https://api.telegram.org/bot{TELEGRAM_BOT_TOKEN}/sendMessage"
    for chat_id in TELEGRAM_CHAT_IDS:
        try:
            requests.post(url, json={"chat_id": chat_id, "text": message, "parse_mode": "Markdown"}, timeout=10)
            time.sleep(0.2)
        except: pass

def get_forecast():
    url = "https://api.open-meteo.com/v1/forecast"
    params = {
        "latitude": LAT, "longitude": LON,
        "hourly": "temperature_2m",
        "timezone": "Europe/Rome",
        "forecast_days": 3 # Prendiamo 3 giorni per coprire bene le 48h
    }
    try:
        r = requests.get(url, params=params, timeout=10)
        r.raise_for_status()
        return r.json()
    except: return None

def analyze_freeze():
    print("--- Controllo Gelo ---")
    data = get_forecast()
    if not data: return

    hourly = data.get("hourly", {})
    times = hourly.get("time", [])
    temps = hourly.get("temperature_2m", [])
    
    now = datetime.datetime.now(ZoneInfo("Europe/Rome"))
    limit_time = now + datetime.timedelta(hours=48)
    
    min_temp_val = 100.0
    min_temp_time = None
    
    # Cerca la minima nelle prossime 48 ore
    for i, t_str in enumerate(times):
        t_obj = parser.isoparse(t_str).replace(tzinfo=ZoneInfo("Europe/Rome"))
        
        # Filtra solo futuro prossimo (da adesso a +48h)
        if t_obj > now and t_obj <= limit_time:
            temp = temps[i]
            if temp < min_temp_val:
                min_temp_val = temp
                min_temp_time = t_obj

    # --- LOGICA ALLARME ---
    state = load_state()
    was_active = state.get("alert_active", False)
    
    # C'è rischio gelo?
    is_freezing = min_temp_val < SOGLIA_GELO
    
    if is_freezing:
        # Formatta orario
        time_str = min_temp_time.strftime('%d/%m alle %H:%M')
        
        # SCENARIO A: NUOVO GELO (o peggioramento significativo di 2 gradi)
        if not was_active or min_temp_val < state.get("min_temp", 0) - 2.0:
            msg = (
                f"❄️ **ALLERTA GELO**\n"
                f"📍 {LOCATION_NAME}\n\n"
                f"Prevista temperatura minima di **{min_temp_val:.1f}°C**\n"
                f"📅 Quando: {time_str}\n\n"
                f"_Proteggere piante e tubature esterne._"
            )
            send_telegram_message(msg)
            save_state(True, min_temp_val)
            print(f"Allerta inviata: {min_temp_val}°C")
        else:
            print(f"Gelo già notificato ({min_temp_val}°C).")
            # Aggiorniamo comunque la minima registrata nel file
            save_state(True, min(min_temp_val, state.get("min_temp", 100)))

    # SCENARIO B: ALLARME RIENTRATO
    elif was_active and not is_freezing:
        msg = (
            f"☀️ **RISCHIO GELO RIENTRATO**\n"
            f"📍 {LOCATION_NAME}\n\n"
            f"Le previsioni per le prossime 48 ore indicano temperature sopra lo zero.\n"
            f"Minima prevista: {min_temp_val:.1f}°C."
        )
        send_telegram_message(msg)
        save_state(False, min_temp_val)
        print("Allarme rientrato.")
    
    else:
        save_state(False, min_temp_val)
        print(f"Nessun gelo. Minima: {min_temp_val}°C")

if __name__ == "__main__":
    analyze_freeze()