#!/usr/bin/env python3
# -*- coding: utf-8 -*-

# ========= Imports & chargement .env =========
import os
import time
import ssl
import smtplib
import logging
import datetime as dt
from email.message import EmailMessage
from typing import List

from dotenv import load_dotenv, find_dotenv
load_dotenv(find_dotenv(usecwd=True), override=False)

# MySQL
import mysql.connector
from mysql.connector import Error as MySQLError

# OVH (optionnel : si non installé, SMS désactivé proprement)
try:
    import ovh
    _ovh_available = True
except Exception:
    _ovh_available = False

# ========= Logger =========
log = logging.getLogger("monitor_saclay")
if not log.handlers:
    logging.basicConfig(level=logging.INFO, format="%(asctime)s %(levelname)s %(message)s")

# ========= Utilitaires DB =========
def get_db():
    cnx = mysql.connector.connect(
        host=os.getenv("DB_HOST", "localhost"),
        user=os.getenv("DB_USER"),
        password=os.getenv("DB_PASS"),
        database=os.getenv("DB_NAME", "Sondes"),
        port=int(os.getenv("DB_PORT", "3306")),
        autocommit=True,
    )
    return cnx

def lire_sondes_depuis_db(site: str):
    """
    Relevés les + récents par sonde pour le site (table = nom du site, ex. 'Saclay').
    Retour: [{"Sonde": str, "Temperature": float, "Date": datetime}]
    """
    table = site
    sql = f"""
        SELECT t1.Sonde, t1.Temperature, t1.Date
        FROM `{table}` t1
        JOIN (
            SELECT Sonde, MAX(Date) AS MaxDate
            FROM `{table}`
            GROUP BY Sonde
        ) t2 ON t1.Sonde=t2.Sonde AND t1.Date=t2.MaxDate
    """
    cnx = get_db()
    try:
        cur = cnx.cursor(dictionary=True)
        cur.execute(sql)
        rows = cur.fetchall()
        for r in rows:
            r["Temperature"] = float(r["Temperature"])
        return rows
    except MySQLError as err:
        log.exception("Erreur DB (lire_sondes_depuis_db): %s", err)
        return []
    finally:
        cnx.close()

def lire_seuils_depuis_db(site: str):
    """
    Lit 'Chambres_froides' pour le site (Etat='ON').
    Retour: dict {sonde: seuil_float}
    """
    sql = """
        SELECT Sonde, Temp_Max
        FROM Chambres_froides
        WHERE Lieu=%s AND Etat='ON'
    """
    cnx = get_db()
    seuils = {}
    try:
        cur = cnx.cursor()
        cur.execute(sql, (site,))
        for sonde, s in cur.fetchall():
            seuils[str(sonde)] = float(s)
        return seuils
    except MySQLError as err:
        log.exception("Erreur DB (lire_seuils_depuis_db): %s", err)
        return seuils
    finally:
        cnx.close()

def depassement_depuis_30min(site: str, sonde: str, seuil: float) -> bool:
    """
    Vrai si dépassement continu >= 30 minutes.
    Approche : cherche la première mesure > seuil dans les 120 dernières minutes,
    vérifie que la dernière mesure est toujours > seuil et que l'écart >= 30 min.
    """
    table = site
    cnx = get_db()
    try:
        cur = cnx.cursor()

        # Dernière valeur
        cur.execute(f"""
            SELECT Temperature, Date
            FROM `{table}`
            WHERE Sonde=%s
            ORDER BY Date DESC
            LIMIT 1
        """, (sonde,))
        last = cur.fetchone()
        if not last:
            return False
        last_temp, last_date = float(last[0]), last[1]
        if last_temp <= float(seuil):
            return False

        # Première mesure > seuil (fenêtre 120 min)
        cur.execute(f"""
            SELECT MIN(Date)
            FROM `{table}`
            WHERE Sonde=%s
              AND Temperature > %s
              AND Date >= (NOW() - INTERVAL 120 MINUTE)
        """, (sonde, float(seuil)))
        first_over = cur.fetchone()[0]
        if not first_over:
            return False

        now = dt.datetime.now(tz=first_over.tzinfo) if hasattr(first_over, "tzinfo") else dt.datetime.now()
        return (now - first_over) >= dt.timedelta(minutes=30)
    except MySQLError as err:
        log.exception("Erreur DB (depassement_depuis_30min): %s", err)
        return False
    finally:
        cnx.close()

def alerte_en_cours(site: str, sonde: str) -> bool:
    table = f"Alertes_{site}"
    cnx = get_db()
    try:
        cur = cnx.cursor()
        cur.execute(
            f"SELECT 1 FROM `{table}` WHERE `Sonde`=%s AND `Etat`='En cours' LIMIT 1",
            (sonde,)
        )
        return cur.fetchone() is not None
    except MySQLError as err:
        log.exception("Erreur DB (alerte_en_cours): %s", err)
        return False
    finally:
        cnx.close()

def creer_alerte(site: str, sonde: str):
    table = f"Alertes_{site}"
    cnx = get_db()
    try:
        cur = cnx.cursor()
        cur.execute(
            f"INSERT INTO `{table}` (`Sonde`, `Debut_defaut`, `Etat`) VALUES (%s, NOW(), 'En cours')",
            (sonde,)
        )
        cnx.commit()
    except MySQLError as err:
        log.exception("Erreur DB (creer_alerte): %s", err)
    finally:
        cnx.close()

def acquitter_alerte(site: str, sonde: str):
    table = f"Alertes_{site}"
    cnx = get_db()
    try:
        cur = cnx.cursor()
        cur.execute(
            f"UPDATE `{table}` SET `Etat`='Acquitté' WHERE `Sonde`=%s AND `Etat`='En cours'",
            (sonde,)
        )
        cnx.commit()
    except MySQLError as err:
        log.exception("Erreur DB (acquitter_alerte): %s", err)
    finally:
        cnx.close()

# ========= Notifications (OVH + SMTP) =========
def _split_list(raw: str | None) -> List[str]:
    return [x.strip() for x in (raw or "").split(",") if x and x.strip()]

class Notifier:
    def __init__(self):
        # OVH
        self.ovh_enabled = _ovh_available and all(
            os.getenv(k) for k in (
                "OVH_APPLICATION_KEY", "OVH_APPLICATION_SECRET", "OVH_CONSUMER_KEY",
                "OVH_SMS_SERVICE", "OVH_SMS_SENDER"
            )
        )
        if self.ovh_enabled:
            self.ovh_client = ovh.Client(
                endpoint=os.getenv("OVH_ENDPOINT", "ovh-eu"),
                application_key=os.getenv("OVH_APPLICATION_KEY"),
                application_secret=os.getenv("OVH_APPLICATION_SECRET"),
                consumer_key=os.getenv("OVH_CONSUMER_KEY"),
            )
            self.ovh_service = os.getenv("OVH_SMS_SERVICE")
            self.ovh_sender  = os.getenv("OVH_SMS_SENDER")
            self.sms_to      = _split_list(os.getenv("ALERT_SMS_TO"))
        else:
            self.sms_to = []

        # SMTP
        self.smtp_host = os.getenv("SMTP_HOST")
        self.smtp_port = int(os.getenv("SMTP_PORT", "465"))
        self.smtp_user = os.getenv("SMTP_USER")
        self.smtp_pass = os.getenv("SMTP_PASS")
        self.mail_from = os.getenv("MAIL_FROM") or self.smtp_user
        self.mail_to   = _split_list(os.getenv("MAIL_TO") or os.getenv("EMAIL_DESTINATAIRES"))
        self.smtp_security = (os.getenv("SMTP_SECURITY", "SSL") or "SSL").upper()
        self.smtp_enabled = all([self.smtp_host, self.smtp_port, self.smtp_user, self.smtp_pass, self.mail_to])

    def send_sms(self, message: str, tag: str = "monitor-saclay") -> bool:
        if not self.ovh_enabled or not self.sms_to:
            log.warning("SMS désactivé ou aucun destinataire.")
            return False
        payload = {
            "sender": self.ovh_sender,
            "receivers": self.sms_to,
            "message": message[:1600],
            "priority": "high",
            "coding": "7bit",
            "class": "phoneDisplay",
            "noStopClause": True,          # transactionnel (H24) si habilité chez OVH
            "senderForResponse": False,
            "validityPeriod": 2880,
            "tag": tag,
        }
        try:
            resp = self.ovh_client.post(f"/sms/{self.ovh_service}/jobs", **payload)
            ids = resp.get("ids") or []
            log.info("SMS OVH envoyé (job ids=%s)", ids)
            # Suivi non bloquant : OVH peut supprimer le job très vite → ignorer 404
            try:
                if ids:
                    job_id = ids[0]
                    for _ in range(3):
                        job = self.ovh_client.get(f"/sms/{self.ovh_service}/jobs/{job_id}")
                        if job.get("status") in ("done", "error", "cancelled"):
                            log.info("Statut job SMS: %s", job.get("status"))
                            break
                        time.sleep(1.5)
            except Exception as err:
                log.debug("Suivi job OVH indisponible (OK): %s", err)
            return True
        except ovh.exceptions.APIError as err:
            log.exception("Erreur API OVH: %s", err)
            return False
        except Exception as err:  # volontaire: ne jamais faire planter le service sur notif
            log.exception("Echec envoi SMS OVH: %s", err)
            return False

    def send_email(self, subject: str, body: str) -> bool:
        if not self.smtp_enabled:
            log.warning("SMTP non configuré, email non envoyé.")
            return False

        msg = EmailMessage()
        msg["From"] = self.mail_from
        msg["To"] = ", ".join(self.mail_to)
        msg["Subject"] = subject
        msg.set_content(body)

        try:
            if self.smtp_security == "STARTTLS":
                with smtplib.SMTP(self.smtp_host, self.smtp_port, timeout=20) as server:
                    server.ehlo()
                    server.starttls(context=ssl.create_default_context())
                    server.ehlo()
                    server.login(self.smtp_user, self.smtp_pass)
                    server.send_message(msg)
            else:
                with smtplib.SMTP_SSL(self.smtp_host, self.smtp_port, context=ssl.create_default_context(), timeout=20) as server:
                    server.login(self.smtp_user, self.smtp_pass)
                    server.send_message(msg)
            log.info("Email envoyé à %s", self.mail_to)
            return True
        except (smtplib.SMTPException, ssl.SSLError) as err:
            log.exception("Erreur SMTP: %s", err)
            return False
        except Exception as err:  # pare-chocs
            log.exception("Echec envoi email: %s", err)
            return False

# ========= Helpers de mise en forme des messages =========
from zoneinfo import ZoneInfo
PARIS = ZoneInfo("Europe/Paris")

def fmt_deg(v: float) -> str:
    s = f"{float(v):.1f}".replace(".", ",")
    return f"{s}°C"

def now_paris() -> dt.datetime:
    return dt.datetime.now(tz=PARIS)

def build_alert_text(site: str, sonde: str, temp: float, seuil: float, when: dt.datetime | None = None):
    when = when or now_paris()
    subject = f"[ALERTE {site}] {sonde} au-dessus du seuil"
    lines = [
        subject + ":",
        f"Sonde: {sonde}",
        f"Température: {fmt_deg(temp)} (seuil {fmt_deg(seuil)})",
        f"Site: {site}",
        f"Heure: {when.strftime('%Y-%m-%d %H:%M:%S')}",
    ]
    txt = "\n".join(lines)
    return subject, txt, txt

def build_ok_text(site: str, sonde: str, temp: float, seuil: float, when: dt.datetime | None = None):
    when = when or now_paris()
    subject = f"[OK {site}] {sonde} revenue normale"
    lines = [
        subject + ":",
        f"Sonde: {sonde}",
        f"Température: {fmt_deg(temp)} <= seuil {fmt_deg(seuil)}",
        f"Site: {site}",
        f"Heure: {when.strftime('%Y-%m-%d %H:%M:%S')}",
    ]
    txt = "\n".join(lines)
    return subject, txt, txt

# ========= Fonctions de notification haut niveau =========
notifier = Notifier()

def notifier_sur_depassement(site: str, sonde: str, temp: float, seuil: float):
    subject, sms_text, email_body = build_alert_text(site, sonde, temp, seuil)
    sms_ok = notifier.send_sms(sms_text)
    mail_ok = notifier.send_email(subject, email_body)
    if sms_ok and mail_ok:
        log.info("Alerte envoyée (SMS+mail) pour %s/%s", site, sonde)
    elif sms_ok:
        log.warning("Alerte: SMS OK, mail KO pour %s/%s", site, sonde)
    elif mail_ok:
        log.warning("Alerte: mail OK, SMS KO pour %s/%s", site, sonde)
    else:
        log.error("Alerte: SMS et mail KO pour %s/%s", site, sonde)

def notifier_acquittement(site: str, sonde: str, temp: float, seuil: float):
    subject, sms_text, email_body = build_ok_text(site, sonde, temp, seuil)
    sms_ok = notifier.send_sms(sms_text)  # retour à la normale: SMS seul (comme convenu)
    if sms_ok:
        log.info("Acquittement envoyé (SMS) pour %s/%s", site, sonde)
    else:
        log.warning("Acquittement: SMS KO pour %s/%s", site, sonde)

# ========= Cycle & boucle de monitoring =========
def run_monitor_cycle(site: str):
    sondes = lire_sondes_depuis_db(site)
    seuils = lire_seuils_depuis_db(site)

    for r in sondes:
        nom = str(r["Sonde"])
        temp = float(r["Temperature"])
        seuil = float(seuils.get(nom, 6.0))  # défaut 6°C si manquant

        if temp > seuil:
            if depassement_depuis_30min(site, nom, seuil) and not alerte_en_cours(site, nom):
                creer_alerte(site, nom)
                notifier_sur_depassement(site, nom, temp, seuil)
        else:
            if alerte_en_cours(site, nom):
                acquitter_alerte(site, nom)
                notifier_acquittement(site, nom, temp, seuil)

def run_monitor_loop(site: str, period_sec: int = 300):
    log.info("Monitor_Saclay démarré (site=%s, période=%ss) ✅", site, period_sec)
    while True:
        t0 = time.time()
        try:
            run_monitor_cycle(site)
        except Exception as err:  # volontaire : ne jamais tuer le service
            log.exception("Erreur cycle monitoring: %s", err)
        time.sleep(max(0, period_sec - (time.time() - t0)))

# ========= Entrée CLI =========
if __name__ == "__main__":
    import argparse
    parser = argparse.ArgumentParser(description="Monitor_Saclay")
    parser.add_argument("--site", default=os.getenv("SITE_NAME", "Saclay"))
    parser.add_argument("--period", type=int, default=300, help="période en secondes (défaut 300)")
    # tests
    parser.add_argument("--test-sms", action="store_true")
    parser.add_argument("--test-mail", action="store_true")
    parser.add_argument("--test-alert", action="store_true")
    parser.add_argument("--test-ok", action="store_true")
    parser.add_argument("--once", action="store_true", help="exécuter un seul cycle puis quitter")
    args = parser.parse_args()

    if args.test_sms:
        notifier.send_sms("TEST DOMO91 (transactionnel)")
    elif args.test_mail:
        notifier.send_email("[TEST DOMO91] Mail", "OK")
    elif args.test_alert:
        notifier_sur_depassement(args.site, "Congelateur", -14.5, -15.0)
    elif args.test_ok:
        notifier_acquittement(args.site, "Congelateur", -15.2, -15.0)
    else:
        if args.once:
            run_monitor_cycle(args.site)
        else:
            run_monitor_loop(args.site, period_sec=args.period)