traduccion_bots/botdiscord/translate.py

import aiohttp
import re
import asyncio
from botdiscord.config import get_libretranslate_url, get_languages
from botdiscord.database import get_available_languages, get_bot_languages
from utils.logger import discord_logger as log
from utils.cache import cache_get, cache_set

def load_lang_mappings(bot_type: str = None):
    global LANG_MAPPING, REVERSE_MAPPING, FLAG_MAPPING, _cached_bot_type, NAME_TO_CODE
    
    if bot_type:
        _cached_bot_type = bot_type
    
    available = get_available_languages()
    
    if not available:
        from botdiscord.config import get_languages
        available = get_languages()
        log.debug(f"Idiomas desde config: {available}")
    
    all_codes = [lang["code"] for lang in available]
    log.debug(f"Códigos disponibles: {all_codes}")
    
    if _cached_bot_type:
        active_codes = get_bot_languages(_cached_bot_type)
        log.debug(f"Códigos activos para {_cached_bot_type}: {active_codes}")
        if not active_codes:
            active_codes = all_codes
    else:
        active_codes = all_codes
    
    if not active_codes:
        active_codes = all_codes
    
    name_to_code = {lang["name"]: lang["code"] for lang in available if lang["code"] in active_codes}
    code_to_name = {lang["code"]: lang["name"] for lang in available if lang["code"] in active_codes}
    flag_dict = {lang["code"]: lang.get("flag", "") for lang in available}
    
    LANG_MAPPING = code_to_name
    NAME_TO_CODE = name_to_code
    FLAG_MAPPING = flag_dict
    REVERSE_MAPPING = code_to_name

_cached_bot_type = None
LANG_MAPPING = {}
REVERSE_MAPPING = {}
FLAG_MAPPING = {}
NAME_TO_CODE = {}

_translation_semaphore = asyncio.Semaphore(5)

async def _translate_segment(session, url, segment, target_code):
    if not re.search(r'[a-zA-Z0-9]', segment):
        return segment
    
    payload = {"q": segment, "source": "auto", "target": target_code, "format": "html"}
    
    async with _translation_semaphore:
        try:
            async with session.post(url, json=payload, timeout=15) as resp:
                if resp.status == 200:
                    data = await resp.json()
                    return data.get("translatedText", segment)
                return segment
        except Exception:
            return segment

_libretranslate_healthy: bool = True
_last_health_check: float = 0
_consecutive_failures: int = 0
_MAX_FAILURES = 2  # Tolerar hasta 2 fallos antes de marcar como caído

async def check_libretranslate_health(url: str) -> bool:
    """Verifica si LibreTranslate está disponible. Cachea el resultado 30 segundos."""
    global _libretranslate_healthy, _last_health_check, _consecutive_failures
    import time
    now = time.monotonic()
    if now - _last_health_check < 30:
        return _libretranslate_healthy
    
    _last_health_check = now
    try:
        from urllib.parse import urlparse, urlunparse
        parsed = urlparse(url)
        # Tomamos solo scheme + netloc y construimos /languages directamente
        check_url = urlunparse((parsed.scheme, parsed.netloc, "/languages", "", "", ""))
        async with aiohttp.ClientSession() as session:
            async with session.get(check_url, timeout=10) as resp:
                if resp.status == 200:
                    _consecutive_failures = 0
                    _libretranslate_healthy = True
                else:
                    _consecutive_failures += 1
    except Exception as e:
        _consecutive_failures += 1
        log.warning(f"⚠️ LibreTranslate health check falló (intento {_consecutive_failures}/{_MAX_FAILURES}): {e}")
    
    if _consecutive_failures >= _MAX_FAILURES:
        _libretranslate_healthy = False
        log.warning("⚠️ LibreTranslate no está disponible tras varios intentos.")
    elif _consecutive_failures > 0:
        # Un solo fallo no bloquea el servicio
        _libretranslate_healthy = True
    
    return _libretranslate_healthy

async def translate_text(text: str, target_lang: str) -> str:
    url = get_libretranslate_url()
    if not url: return text
    
    # Health Check: si LibreTranslate está caído, retornamos el texto con aviso
    if not await check_libretranslate_health(url):
        return f"⚠️ *Servicio de traducción en mantenimiento.* | {text}"
    
    target_code = NAME_TO_CODE.get(target_lang, target_lang)
    
    # Revisamos caché Redis antes de hacer cualquier petición
    redis_key = f"trans:{target_code}:{hash(text)}"
    cached = cache_get(redis_key)
    if cached:
        return cached
    
    segments = re.split(r'([.?!]+\s*|\n+)', text)
    
    try:
        async with aiohttp.ClientSession() as session:
            tasks = [_translate_segment(session, url, seg, target_code) for seg in segments]
            translated_segments = await asyncio.gather(*tasks)
            result = "".join(translated_segments)
            
            # No cachear mensajes de error
            if result and result != text and "mantenimiento" not in result:
                cache_set(redis_key, result, ttl=86400)
            return result if result else text
    except Exception:
        return text

def translate_text_sync(text: str, target_lang: str) -> str:
    """Versión síncrona de translate_text utilizando un hilo separado."""
    if not text or not target_lang or target_lang == "es":
        return text
        
    import threading
    
    result = []
    def target():
        # Creamos un nuevo bucle de eventos exclusivo para este hilo
        new_loop = asyncio.new_event_loop()
        asyncio.set_event_loop(new_loop)
        try:
            res = new_loop.run_until_complete(translate_text(text, target_lang))
            result.append(res)
        finally:
            new_loop.close()
    
    # Ejecutamos la traducción en un hilo aparte para no interferir con el loop de FastAPI
    thread = threading.Thread(target=target)
    thread.start()
    thread.join(timeout=15) # Esperamos máximo 15 segundos
    
    return result[0] if result else text

def get_lang_mapping(bot_type: str = None) -> dict:
    load_lang_mappings(bot_type)
    return LANG_MAPPING.copy()

def get_reverse_mapping(bot_type: str = None) -> dict:
    load_lang_mappings(bot_type)
    return REVERSE_MAPPING.copy()

def get_flag_mapping(bot_type: str = None) -> dict:
    load_lang_mappings(bot_type)
    return FLAG_MAPPING.copy()

def get_name_to_code(bot_type: str = None) -> dict:
    load_lang_mappings(bot_type)
    return NAME_TO_CODE.copy()

def get_lang_flag(lang_code: str) -> str:
    return FLAG_MAPPING.get(lang_code, "")