"""Envoi d'alertes par email via SMTP."""

import smtplib
from email.mime.text import MIMEText
from email.mime.multipart import MIMEMultipart


class EmailAlerter:
    def __init__(self, config_manager):
        self.config = config_manager

    def _get_smtp_config(self):
        return self.config.get("smtp", {})

    def is_configured(self):
        smtp = self._get_smtp_config()
        return bool(smtp.get("server") and smtp.get("from_email") and smtp.get("to_emails"))

    def send_alert(self, subject, body):
        """Envoie un email d'alerte. Silencieux si SMTP non configure."""
        if not self.is_configured():
            return False, "SMTP non configure"
        return self._send_email(subject, body)

    def send_test(self):
        """Envoie un email de test pour valider la configuration SMTP."""
        if not self.is_configured():
            return False, "Configuration SMTP incomplete"
        subject = "[TEST] Supervision - Test de configuration email"
        body = (
            "Ceci est un email de test.\n\n"
            "Si vous recevez ce message, la configuration SMTP est correcte.\n\n"
            "-- Supervision"
        )
        return self._send_email(subject, body)

    def _send_email(self, subject, body):
        smtp_cfg = self._get_smtp_config()
        try:
            msg = MIMEMultipart()
            msg["From"] = smtp_cfg["from_email"]
            msg["To"] = ", ".join(smtp_cfg["to_emails"])
            msg["Subject"] = subject
            msg.attach(MIMEText(body, "plain", "utf-8"))

            server_addr = smtp_cfg["server"]
            port = int(smtp_cfg.get("port", 587))
            use_tls = smtp_cfg.get("use_tls", True)

            if use_tls:
                server = smtplib.SMTP(server_addr, port, timeout=15)
                server.ehlo()
                server.starttls()
                server.ehlo()
            else:
                server = smtplib.SMTP(server_addr, port, timeout=15)
                server.ehlo()

            username = smtp_cfg.get("username", "")
            password = smtp_cfg.get("password", "")
            if username and password:
                server.login(username, password)

            server.sendmail(
                smtp_cfg["from_email"],
                smtp_cfg["to_emails"],
                msg.as_string(),
            )
            server.quit()
            return True, "Email envoye avec succes"

        except smtplib.SMTPAuthenticationError:
            return False, "Erreur d'authentification SMTP (identifiants incorrects)"
        except smtplib.SMTPConnectError:
            return False, f"Impossible de se connecter au serveur SMTP {server_addr}:{port}"
        except smtplib.SMTPRecipientsRefused:
            return False, "Destinataire(s) refuse(s) par le serveur"
        except TimeoutError:
            return False, f"Timeout de connexion vers {server_addr}:{port}"
        except Exception as e:
            return False, f"Erreur SMTP: {str(e)}"