"""
main.py — Entrypoint de Pedrito Hechakuaa.

Arranca el bot de Telegram, el poller y el servidor HTTP de health check en paralelo.
Al arrancar: aplica migraciones y migra el tenant principal del .env si no existe.
"""
from __future__ import annotations

import asyncio
import os
import signal
import sys
import threading

import structlog
from telegram.ext import Application

import health as health_mod
import vault as vault_mod
from config import get_settings
from database import get_tenant, run_migrations, save_tenant
from health import HealthServer, record_poll
from onboarding import OnboardingFlow
from poller import Poller
from telegram_bot import PedritoBot

# Configurar structlog
structlog.configure(
    processors=[
        structlog.contextvars.merge_contextvars,
        structlog.processors.add_log_level,
        structlog.processors.TimeStamper(fmt="iso"),
        structlog.dev.ConsoleRenderer() if sys.stderr.isatty() else structlog.processors.JSONRenderer(),
    ]
)

logger = structlog.get_logger(__name__)


async def _migrar_tenant_principal(settings) -> None:
    """
    Migra el tenant principal del .env a la DB si todavía no existe.
    Permite que el dueño del bot siga funcionando sin re-registrarse.
    """
    chat_id = settings.telegram_chat_id
    existente = await get_tenant(chat_id)
    if existente:
        logger.info("tenant_principal_ya_existe", chat_id=chat_id)
        return

    logger.info("migrando_tenant_principal_del_env", chat_id=chat_id)
    usuario = settings.descifrar_usuario()
    password = settings.descifrar_password()
    try:
        credentials_enc = vault_mod.cifrar_credenciales(
            chat_id=chat_id,
            usuario=usuario,
            password=password,
            fernet_key=settings.fernet_key,
        )
    finally:
        del usuario, password

    await save_tenant(
        chat_id,
        nombre_preferido="Admin",
        tono="cotidiano",
        timezone="America/Asuncion",
        credentials_enc=credentials_enc,
        estado="activo",
        consentimiento_aceptado=1,
    )
    logger.info("tenant_principal_migrado", chat_id=chat_id)


def _limpiar_env_sensibles() -> None:
    """
    Elimina variables sensibles del entorno del proceso después de cargar Settings.

    Protege contra:
    - cat /proc/<pid>/environ  (cualquier usuario con acceso al PID)
    - herencia accidental de env vars por subprocesos
    - stack traces que vuelquen os.environ

    NO protege contra 'docker inspect' (que lee la config del contenedor, no el env live).
    Para eso usar Docker secrets con Swarm mode.
    """
    _sensibles = (
        "FERNET_KEY",
        "TELEGRAM_BOT_TOKEN",
        "PJ_USUARIO_ENC",
        "PJ_PASSWORD_ENC",
        "WEBHOOK_SECRET",
        "HEALTH_AUTH_TOKEN",
        "INVITE_CODE",
        "ADMIN_TOKEN",
    )
    for var in _sensibles:
        os.environ.pop(var, None)


def _run_admin(settings) -> None:
    """Arranca el panel de administración en su propio thread y event loop."""
    import uvicorn
    from admin.app import create_app

    if not settings.admin_token:
        logger.warning("admin_panel_sin_token_no_iniciado")
        return

    admin_app = create_app(
        db_path=str(settings.db_path),
        admin_token=settings.admin_token,
        data_dir=settings.data_dir,
    )
    uvicorn.run(
        admin_app,
        host="127.0.0.1",
        port=settings.admin_port,
        log_level="warning",
    )


async def main() -> None:
    settings = get_settings()
    _limpiar_env_sensibles()

    logger.info(
        "pedrito_hechakuaa_iniciando",
        poll_interval_minutes=settings.poll_interval_minutes,
        horario=f"{settings.poll_hora_inicio}:00-{settings.poll_hora_fin}:00",
        chat_id=settings.telegram_chat_id,
        webhook_mode=bool(settings.webhook_url),
    )

    # Migraciones y tenant principal
    await run_migrations(settings.db_path)
    await _migrar_tenant_principal(settings)

    # Bot de Telegram
    onboarding = OnboardingFlow(settings)
    pedrito_bot = PedritoBot(
        token=settings.telegram_bot_token,
        settings=settings,
        onboarding=onboarding,
    )
    app: Application = pedrito_bot.build()

    # Poller
    poller = Poller(
        settings=settings,
        bot=pedrito_bot,
        on_poll_done=record_poll,
    )

    pedrito_bot.set_notif_callback(
        lambda chat_id: poller.revisar_ahora(chat_id=chat_id, es_manual=True)
    )

    # Panel de administración (thread daemon — muere con el proceso principal)
    admin_thread = threading.Thread(target=_run_admin, args=(settings,), daemon=True)
    admin_thread.start()

    # Manejo de señales para shutdown limpio
    loop = asyncio.get_running_loop()
    health_server: HealthServer | None = None

    def handle_shutdown(sig: int) -> None:
        logger.info("shutdown_recibido", signal=sig)
        poller.detener()
        loop.stop()

    for sig in (signal.SIGINT, signal.SIGTERM):
        try:
            loop.add_signal_handler(sig, handle_shutdown, sig)
        except NotImplementedError:
            pass  # Windows no soporta add_signal_handler

    async with app:
        await app.initialize()
        await app.start()
        logger.info("bot_telegram_iniciado")

        # Servidor HTTP de health check (y webhook si está configurado)
        health_server = HealthServer(settings=settings, application=app)
        await health_server.start()

        if settings.webhook_url:
            # Registrar el webhook con Telegram
            webhook_url = f"{settings.webhook_url.rstrip('/')}/webhook"
            await app.bot.set_webhook(
                url=webhook_url,
                secret_token=settings.webhook_secret or None,
                drop_pending_updates=True,
            )
            logger.info("webhook_registrado", url=webhook_url)
            telegram_task = asyncio.create_task(asyncio.sleep(0))  # placeholder
        else:
            # Long-polling
            telegram_task = asyncio.create_task(
                app.updater.start_polling(drop_pending_updates=True)
            )

        poller_task = asyncio.create_task(poller.run_forever())

        logger.info("pedrito_hechakuaa_corriendo")

        try:
            if settings.webhook_url:
                await poller_task
            else:
                await asyncio.gather(telegram_task, poller_task)
        except asyncio.CancelledError:
            pass
        finally:
            if health_server:
                await health_server.stop()
            if settings.webhook_url:
                try:
                    await app.bot.delete_webhook()
                except Exception:
                    pass
            else:
                await app.updater.stop()
            await app.stop()

    logger.info("pedrito_hechakuaa_detenido")


if __name__ == "__main__":
    asyncio.run(main())