import torch
import spaces
import re
from transformers import AutoModelForSeq2SeqLM, AutoTokenizer
from huggingface_hub import login
import os

max_length = 512
auth_token = os.getenv('HF_SPACE_TOKEN')
login(token=auth_token)

def split_text_intelligently(text, max_chunk_length=80):
    """
    Divise le texte en chunks en respectant les phrases complètes.
    """
    # Séparation basée sur les phrases (utilise les points, points d'interrogation, etc.)
    sentences = re.split(r'([.!?:])', text)
    chunks = []
    current_chunk = ""
    
    for i in range(0, len(sentences), 2):
        # Reconstruire la phrase avec sa ponctuation
        if i + 1 < len(sentences):
            sentence = sentences[i] + sentences[i+1]
        else:
            sentence = sentences[i]
        
        # Si l'ajout de cette phrase dépasse la longueur maximale, on crée un nouveau chunk
        if len(current_chunk) + len(sentence) > max_chunk_length and current_chunk:
            chunks.append(current_chunk.strip())
            current_chunk = sentence
        else:
            current_chunk += sentence
    
    # Ajouter le dernier chunk s'il reste du texte
    if current_chunk:
        chunks.append(current_chunk.strip())
    
    return chunks

@spaces.GPU
def goai_traduction(text, src_lang, tgt_lang, max_chunk_length=80):
    # Si le texte est trop long, le diviser en chunks
    if len(text) > max_chunk_length:
        chunks = split_text_intelligently(text, max_chunk_length)
        translations = []
        
        for chunk in chunks:
            translated_chunk = translate_chunk(chunk, src_lang, tgt_lang)
            translations.append(translated_chunk)
        
        return " ".join(translations)
    else:
        return translate_chunk(text, src_lang, tgt_lang)

def translate_chunk(text, src_lang, tgt_lang):
    device = torch.device("cuda" if torch.cuda.is_available() else "cpu")
    
    if src_lang == "mos_Latn" and tgt_lang == "fra_Latn":
        model_id = "ArissBandoss/mos2fr-3B"
    else:
        #model_id = "ArissBandoss/nllb-200-distilled-600M-finetuned-fr-to-mos-V4"
        model_id = "ArissBandoss/fr2mos-1B"
    
    tokenizer = AutoTokenizer.from_pretrained(model_id, token=auth_token)
    model = AutoModelForSeq2SeqLM.from_pretrained(model_id, token=auth_token).to(device)
    
    # Configuration du tokenizer
    tokenizer.src_lang = src_lang
    
    # Tokenisation
    inputs = tokenizer(text, return_tensors="pt", truncation=True, max_length=512).to(device)
    
    # ID du token de langue cible
    tgt_lang_id = tokenizer.convert_tokens_to_ids(tgt_lang)
    
    # Paramètres de génération optimisés pour éviter les répétitions
    outputs = model.generate(
        **inputs,
        forced_bos_token_id=tgt_lang_id,
        max_new_tokens=512,
        early_stopping=True
    )
    
    # Décodage
    translation = tokenizer.batch_decode(outputs, skip_special_tokens=True)[0]
    
    return translation

def real_time_traduction(input_text, src_lang, tgt_lang):
    return goai_traduction(input_text, src_lang, tgt_lang)