"""
translator.py — Traduction multi-moteurs avec fallback automatique
Utilise deep-translator uniquement (pas de conflit avec gradio/httpx)

Ordre de fallback :
  1. deep-translator GoogleTranslator   (Google Translate, gratuit)
  2. deep-translator MyMemoryTranslator (5000 mots/jour gratuit)
  3. deep-translator LibreTranslator    (open source)
  4. Texte français original conservé  (jamais de crash)

Codes de langue supportés : fr, en, sw, rn (Rundi/Kirundi)
"""

import time

# ── Mapping codes internes → codes deep-translator ───────────────────────────

# deep-translator GoogleTranslator accepte les noms complets ou codes ISO
DEEP_GOOGLE_CODES = {
    "fr": "fr",
    "en": "en",
    "sw": "sw",
    "rn": "rn",    # Rundi — supporté par Google Translate
}

# MyMemoryTranslator utilise le format "lang-REGION"
MYMEMORY_CODES = {
    "fr": "fr-FR",
    "en": "en-US",
    "sw": "sw-KE",
    "rn": "rn-BI",   # Rundi — Burundi
}

# LibreTranslator codes ISO 639-1
LIBRE_CODES = {
    "fr": "fr",
    "en": "en",
    "sw": "sw",
    "rn": "rn",
}


# ══════════════════════════════════════════════════════════════════════════════
# MOTEUR 1 — deep-translator GoogleTranslator
# Utilise Google Translate en arrière-plan, gratuit et sans API key
# ══════════════════════════════════════════════════════════════════════════════

def _translate_deep_google(text: str, lang_code: str) -> str | None:
    dest = DEEP_GOOGLE_CODES.get(lang_code)
    if not dest:
        return None
    try:
        from deep_translator import GoogleTranslator
        result = GoogleTranslator(source="fr", target=dest).translate(text)
        if result and result.strip() and len(result.strip()) > 3:
            return result.strip()
    except Exception as e:
        print(f"  deep-google ECHEC ({lang_code}) : {str(e)[:70]}")
    return None


# ══════════════════════════════════════════════════════════════════════════════
# MOTEUR 2 — deep-translator MyMemoryTranslator
# 5000 mots/jour gratuit sans compte
# ══════════════════════════════════════════════════════════════════════════════

def _translate_mymemory(text: str, lang_code: str) -> str | None:
    dest = MYMEMORY_CODES.get(lang_code)
    if not dest:
        return None
    try:
        from deep_translator import MyMemoryTranslator
        result = MyMemoryTranslator(source="fr-FR", target=dest).translate(text)
        if result and result.strip() and len(result.strip()) > 3:
            # MyMemory retourne un avertissement si la limite est atteinte
            if any(w in result for w in ["MYMEMORY WARNING", "QUOTA FINISHED", "YOU USED"]):
                print(f"  MyMemory : limite atteinte")
                return None
            return result.strip()
    except Exception as e:
        print(f"  MyMemory ECHEC ({lang_code}) : {str(e)[:70]}")
    return None


# ══════════════════════════════════════════════════════════════════════════════
# MOTEUR 3 — deep-translator LibreTranslator
# Open source, serveur public disponible
# ══════════════════════════════════════════════════════════════════════════════

def _translate_libre(text: str, lang_code: str) -> str | None:
    dest = LIBRE_CODES.get(lang_code)
    if not dest:
        return None
    try:
        from deep_translator import LibreTranslator
        result = LibreTranslator(
            source="fr",
            target=dest,
            url="https://libretranslate.com",
            api_key=""
        ).translate(text)
        if result and result.strip() and len(result.strip()) > 3:
            return result.strip()
    except Exception as e:
        print(f"  LibreTranslate ECHEC ({lang_code}) : {str(e)[:70]}")
    return None


# ══════════════════════════════════════════════════════════════════════════════
# FONCTION PRINCIPALE — fallback automatique
# ══════════════════════════════════════════════════════════════════════════════

# Ordre des moteurs : du plus fiable au moins fiable
_ENGINES = [
    ("deep-google",   _translate_deep_google),
    ("mymemory",      _translate_mymemory),
    ("libretranslate",_translate_libre),
]


def translate(text: str, lang_code: str, pause: float = 0.1) -> str:
    """
    Traduit un texte français vers lang_code avec fallback automatique.
    Essaie chaque moteur dans l'ordre jusqu'au premier succès.
    Si tous échouent → retourne le texte original.

    lang_code : "fr" | "en" | "sw" | "rn"
    pause     : délai entre tentatives (secondes)
    """
    if lang_code == "fr" or not text or not text.strip():
        return text

    for engine_name, engine_fn in _ENGINES:
        try:
            result = engine_fn(text, lang_code)
            if result:
                print(f"Traduction OK via {engine_name} ({lang_code})")
                time.sleep(pause)
                return result
            else:
                print(f"  {engine_name} : résultat vide → moteur suivant")
        except Exception as e:
            print(f"  {engine_name} erreur inattendue : {str(e)[:60]}")
        time.sleep(pause)

    # Tous les moteurs ont échoué
    print(f"TOUS les moteurs ont échoué ({lang_code}) — texte original conservé")
    return text


def translate_fields(fields: dict, lang_code: str) -> dict:
    """
    Traduit un dictionnaire de champs texte du français vers lang_code.
    Chaque champ est traduit indépendamment avec fallback.

    fields  : {"disease_name": "...", "cause": "...", ...}
    Retourne les champs traduits (ou originaux si échec).
    """
    if lang_code == "fr":
        return fields

    translated = {}
    for key, value in fields.items():
        if not value or value in ("—", ""):
            translated[key] = value
            continue
        translated[key] = translate(value, lang_code)

    return translated


# ══════════════════════════════════════════════════════════════════════════════
# TEST — lance ce fichier directement pour vérifier les moteurs
# python translator.py
# ══════════════════════════════════════════════════════════════════════════════

if __name__ == "__main__":
    tests = {
        "disease_name": "Mildiou de la tomate",
        "cause":        "Champignon Phytophthora infestans. Favorisé par l'humidité élevée.",
        "treatment":    "Appliquer un fongicide cuivrique. Retirer les feuilles infectées.",
    }

    for code, label in [("en", "English"), ("sw", "Swahili"), ("rn", "Rundi/Kirundi")]:
        print(f"\n{'='*50}")
        print(f"LANGUE : {label} ({code})")
        print(f"{'='*50}")
        results = translate_fields(tests, code)
        for key, val in results.items():
            print(f"  {key}: {val}")