"""Envío de correo SMTP."""

import os
import smtplib
from email.message import EmailMessage
from pathlib import Path

from dotenv import load_dotenv

# comercio-net/.env o .env en la raíz del repo
# _BASE = Path(__file__).resolve().parent
# load_dotenv(_BASE / ".env")
# load_dotenv(_BASE.parent / ".env")
# ============================================================================

load_dotenv(dotenv_path=".env")

# ============================================================================
def _mail_config() -> dict:
    host = os.getenv("MAIL_HOST", "")
    port = int(os.getenv("MAIL_PORT", "587"))
    username = os.getenv("MAIL_USERNAME", "")
    # App passwords de Gmail suelen pegarse con espacios
    password = (os.getenv("MAIL_PASSWORD", "") or "").replace(" ", "")
    mail_from = os.getenv("MAIL_FROM", username)
    mail_to = os.getenv("MAIL_TO", "")
    if not all([host, username, password, mail_from, mail_to]):
        raise ValueError(
            "Faltan variables MAIL_* en .env "
            "(MAIL_HOST, MAIL_USERNAME, MAIL_PASSWORD, MAIL_FROM, MAIL_TO)"
        )
    return {
        "host": host,
        "port": port,
        "username": username,
        "password": password,
        "mail_from": mail_from,
        "mail_to": mail_to,
    }

# ============================================================================
def _smtp_send(msg: EmailMessage) -> None:
    cfg = _mail_config()
    with smtplib.SMTP(cfg["host"], cfg["port"], timeout=30) as smtp:
        smtp.ehlo()
        smtp.starttls()
        smtp.ehlo()
        smtp.login(cfg["username"], cfg["password"])
        smtp.send_message(msg)

# ============================================================================
def send_mail(subject: str | None = None, text: str | None = None) -> None:
    """Envía un correo de texto plano usando variables MAIL_* del .env."""
    cfg = _mail_config()
    subject = subject if subject is not None else os.getenv("MAIL_SUBJECT", "Test Email")
    text = text if text is not None else os.getenv("MAIL_TEXT", "This is a test email")

    msg = EmailMessage()
    msg["Subject"] = subject
    msg["From"] = cfg["mail_from"]
    msg["To"] = cfg["mail_to"]
    msg.set_content(text)

    _smtp_send(msg)
    print(f"OK: correo enviado a {cfg['mail_to']} | subject={subject!r}")

# ============================================================================
def send_validation_email(html_path: Path | str, subject: str | None = None) -> None:
    """Envía el HTML de validación a MAIL_TO (cuerpo HTML + adjunto)."""
    cfg = _mail_config()
    path = Path(html_path)
    if not path.is_file():
        raise FileNotFoundError(f"No existe el HTML de validación: {path}")

    html = path.read_text(encoding="utf-8")
    if subject is None:
        subject = f"Validación OC — diferencias de precio/catálogo ({path.stem})"

    msg = EmailMessage()
    msg["Subject"] = subject
    msg["From"] = cfg["mail_from"]
    msg["To"] = cfg["mail_to"]
    msg.set_content(
        "Se detectaron diferencias de catálogo o precio en la OC. "
        "Ver el contenido HTML de este correo. "
    )
    msg.add_alternative(html, subtype="html")
    #msg.add_attachment(
    #    html.encode("utf-8"),
    #    maintype="text",
    #    subtype="html",
    #    filename=path.name,
    #)

    _smtp_send(msg)
    print(f"OK: correo de validación enviado a {cfg['mail_to']} | subject={subject!r}")

# ============================================================================
if __name__ == "__main__":
    send_mail()