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import os
import asyncio
import logging
import tempfile
import requests
from datetime import datetime
import edge_tts
import gradio as gr
import torch
from transformers import GPT2Tokenizer, GPT2LMHeadModel
from keybert import KeyBERT
from moviepy.editor import VideoFileClip, concatenate_videoclips, AudioFileClip, CompositeAudioClip
import re
import math
from pydub import AudioSegment
from collections import Counter
import shutil
import json

# Configuración de logging MEJORADA
logging.basicConfig(
    level=logging.DEBUG,
    format='%(asctime)s - %(levelname)s - %(message)s',
    handlers=[
        logging.StreamHandler(),
        logging.FileHandler('video_generator_full.log', encoding='utf-8')
    ]
)
logger = logging.getLogger(__name__)
logger.info("="*80)
logger.info("INICIO DE EJECUCIÓN - GENERADOR DE VIDEOS")
logger.info("="*80)

# Clave API de Pexels (configuración segura)
PEXELS_API_KEY = os.environ.get("PEXELS_API_KEY")
if not PEXELS_API_KEY:
    logger.critical("NO SE ENCONTRÓ PEXELS_API_KEY EN VARIABLES DE ENTORNO")
    raise ValueError("API key de Pexels no configurada")
else:
    logger.info("API key de Pexels configurada correctamente")

# Inicialización de modelos CON LOGS DETALLADOS
MODEL_NAME = "datificate/gpt2-small-spanish"
logger.info(f"Inicializando modelo GPT-2: {MODEL_NAME}")
try:
    tokenizer = GPTizer.from_pretrained(MODEL_NAME)
    model = GPT2LMHeadModel.from_pretrained(MODEL_NAME).eval()
    if tokenizer.pad_token is None:
        tokenizer.pad_token = tokenizer.eos_token
    logger.info(f"Modelo GPT-2 cargado | Vocabulario: {len(tokenizer)} tokens")
except Exception as e:
    logger.error(f"FALLA CRÍTICA al cargar GPT-2: {str(e)}", exc_info=True)
    tokenizer = model = None

logger.info("Cargando modelo KeyBERT...")
try:
    kw_model = KeyBERT('distilbert-base-multilingual-cased')
    logger.info("KeyBERT inicializado correctamente")
except Exception as e:
    logger.error(f"FALLA al cargar KeyBERT: {str(e)}", exc_info=True)
    kw_model = None

# [FUNCIÓN BUSCAR_VIDEOS_PEXELS ORIGINAL CON LOGS AÑADIDOS]
def buscar_videos_pexels(query, api_key, per_page=5):
    logger.debug(f"Buscando en Pexels: '{query}' | Resultados: {per_page}")
    headers = {"Authorization": api_key}
    try:
        params = {
            "query": query,
            "per_page": per_page,
            "orientation": "landscape",
            "size": "medium"
        }
        
        logger.debug(f"Params: {params}")
        response = requests.get(
            "https://api.pexels.com/videos/search",
            headers=headers,
            params=params,
            timeout=20
        )
        response.raise_for_status()
        
        try:
            data = response.json()
            logger.info(f"Pexels: {len(data.get('videos', []))} videos encontrados")
            return data.get('videos', [])
        except json.JSONDecodeError:
            logger.error(f"Pexels: JSON inválido | Status: {response.status_code} | Respuesta: {response.text[:200]}...")
            return []
            
    except requests.exceptions.RequestException as e:
        logger.error(f"Error de conexión Pexels: {str(e)}")
    except Exception as e:
        logger.error(f"Error inesperado Pexels: {str(e)}", exc_info=True)
    
    return []

# [FUNCIÓN GENERATE_SCRIPT ORIGINAL CON LOGS]
def generate_script(prompt, max_length=150):
    logger.info(f"Generando guión | Prompt: '{prompt[:50]}...' | Longitud máxima: {max_length}")
    if not tokenizer or not model:
        logger.warning("Modelos no disponibles - Usando prompt original")
        return prompt
    
    try:
        enhanced_prompt = f"Escribe un guion corto y coherente sobre: {prompt}"
        inputs = tokenizer(enhanced_prompt, return_tensors="pt", truncation=True, max_length=512)
        
        logger.debug("Generando texto con GPT-2...")
        outputs = model.generate(
            **inputs,
            max_length=max_length,
            do_sample=True,
            top_p=0.9,
            top_k=40,
            temperature=0.7,
            repetition_penalty=1.5,
            pad_token_id=tokenizer.pad_token_id,
            eos_token_id=tokenizer.eos_token_id
        )
        
        text = tokenizer.decode(outputs[0], skip_special_tokens=True)
        text = re.sub(r'<[^>]+>', '', text)
        sentences = text.split('.')
        
        if sentences:
            final_text = sentences[0] + '.'
            logger.info(f"Guion generado: '{final_text[:100]}...'")
            return final_text
        return text
    except Exception as e:
        logger.error(f"Error generando guion: {str(e)}", exc_info=True)
        return prompt

# [FUNCIÓN TEXT_TO_SPEECH ORIGINAL CON LOGS]
async def text_to_speech(text, output_path, voice="es-ES-ElviraNeural"):
    logger.info(f"Convirtiendo texto a voz | Caracteres: {len(text)} | Voz: {voice}")
    try:
        communicate = edge_tts.Communicate(text, voice)
        await communicate.save(output_path)
        logger.info(f"Audio guardado en: {output_path} | Tamaño: {os.path.getsize(output_path)} bytes")
        return True
    except Exception as e:
        logger.error(f"Error en TTS: {str(e)}", exc_info=True)
        return False

# [FUNCIÓN DOWNLOAD_VIDEO_FILE ORIGINAL CON LOGS]
def download_video_file(url, temp_dir):
    if not url:
        logger.warning("URL de video no proporcionada")
        return None
    
    try:
        logger.info(f"Descargando video desde: {url[:50]}...")
        file_name = f"video_{datetime.now().strftime('%H%M%S%f')}.mp4"
        output_path = os.path.join(temp_dir, file_name)
        
        with requests.get(url, stream=True, timeout=30) as r:
            r.raise_for_status()
            with open(output_path, 'wb') as f:
                for chunk in r.iter_content(chunk_size=8192):
                    f.write(chunk)
        
        logger.info(f"Video descargado: {output_path} | Tamaño: {os.path.getsize(output_path)} bytes")
        return output_path
    except Exception as e:
        logger.error(f"Error descargando video: {str(e)}", exc_info=True)
        return None

# [FUNCIÓN LOOP_AUDIO_TO_LENGTH ORIGINAL CON LOGS]
def loop_audio_to_length(audio_clip, target_duration):
    logger.debug(f"Ajustando audio | Duración actual: {audio_clip.duration:.2f}s | Objetivo: {target_duration:.2f}s")
    if audio_clip.duration >= target_duration:
        return audio_clip.subclip(0, target_duration)
    
    loops = math.ceil(target_duration / audio_clip.duration)
    logger.debug(f"Creando {loops} loops de audio")
    audios = [audio_clip] * loops
    return concatenate_videoclips(audios).subclip(0, target_duration)

# [FUNCIÓN EXTRACT_VISUAL_KEYWORDS_FROM_SCRIPT ORIGINAL CON LOGS]
def extract_visual_keywords_from_script(script_text):
    logger.info("Extrayendo palabras clave del guion")
    clean_text = re.sub(r'[^\w\sáéíóúñ]', '', script_text.lower())
    
    if kw_model:
        try:
            keywords = kw_model.extract_keywords(
                clean_text,
                keyphrase_ngram_range=(1, 1),
                stop_words='spanish',
                top_n=3
            )
            if keywords:
                logger.debug(f"KeyBERT keywords: {keywords}")
                return [kw[0].replace(" ", "+") for kw in keywords]
        except Exception as e:
            logger.warning(f"KeyBERT falló: {str(e)}")
    
    words = clean_text.split()
    stop_words = {"el", "la", "los", "las", "de", "en", "y", "a", "que", "es", "un", "una", "con"}
    keywords = [word for word in words if len(word) > 3 and word not in stop_words]
    
    if not keywords:
        logger.warning("Usando palabras clave predeterminadas")
        return ["naturaleza", "ciudad", "paisaje"]
    
    word_counts = Counter(keywords)
    top_keywords = [word.replace(" ", "+") for word, _ in word_counts.most_common(3)]
    logger.info(f"Palabras clave finales: {top_keywords}")
    return top_keywords

# [FUNCIÓN CREAR_VIDEO ORIGINAL CON LOGS]
def crear_video(prompt_type, input_text, musica_file=None):
    logger.info("="*80)
    logger.info(f"INICIANDO CREACIÓN DE VIDEO | Tipo: {prompt_type}")
    logger.debug(f"Input: '{input_text[:100]}...'")
    
    # 1. Generar o usar guion
    start_time = datetime.now()
    if prompt_type == "Generar Guion con IA":
        logger.info("Generando guion con IA...")
        guion = generate_script(input_text)
    else: 
        logger.info("Usando guion proporcionado")
        guion = input_text
    
    logger.info(f"Guion final ({len(guion)} caracteres): '{guion[:100]}...'")
    
    if not guion.strip():
        logger.error("El guion está vacío")
        raise ValueError("El guion está vacío")
    
    # Directorio temporal
    temp_dir = tempfile.mkdtemp()
    logger.info(f"Directorio temporal creado: {temp_dir}")
    temp_files = []
    
    try:
        # 2. Generar audio de voz
        logger.info("Generando audio de voz...")
        voz_path = os.path.join(temp_dir, "voz.mp3")
        if not asyncio.run(text_to_speech(guion, voz_path)):
            logger.error("Fallo en generación de voz")
            raise ValueError("Error generando voz")
        temp_files.append(voz_path)
        
        audio_tts = AudioFileClip(voz_path)
        audio_duration = audio_tts.duration
        logger.info(f"Duración audio voz: {audio_duration:.2f} segundos")
        
        # 3. Extraer palabras clave
        logger.info("Extrayendo palabras clave...")
        try:
            keywords = extract_visual_keywords_from_script(guion)
            logger.info(f"Palabras clave identificadas: {keywords}")
        except Exception as e:
            logger.error(f"Error extrayendo keywords: {str(e)}")
            keywords = ["naturaleza", "paisaje"]
        
        # 4. Buscar y descargar videos
        logger.info("Buscando videos en Pexels...")
        videos_data = []
        for keyword in keywords:
            try:
                videos = buscar_videos_pexels(keyword, PEXELS_API_KEY, per_page=3)
                if videos:
                    videos_data.extend(videos)
                    logger.info(f"Encontrados {len(videos)} videos para '{keyword}'")
            except Exception as e:
                logger.warning(f"Error buscando videos para '{keyword}': {str(e)}")
        
        if not videos_data:
            logger.warning("No se encontraron videos - Usando palabras clave genéricas")
            for keyword in ["naturaleza", "ciudad", "paisaje"]:
                videos = buscar_videos_pexels(keyword, PEXELS_API_KEY, per_page=3)
                if videos:
                    videos_data.extend(videos)
        
        if not videos_data:
            logger.error("No se encontraron videos para ninguna palabra clave")
            raise ValueError("No se encontraron videos en Pexels para ninguna palabra clave")
        
        video_paths = []
        for video in videos_data:
            if 'video_files' not in video or not video['video_files']:
                continue
                
            try:
                best_quality = max(
                    video['video_files'], 
                    key=lambda x: x.get('width', 0) * x.get('height', 0)
                )
                
                if 'link' in best_quality:
                    path = download_video_file(best_quality['link'], temp_dir)
                    if path:
                        video_paths.append(path)
                        temp_files.append(path)
                        logger.info(f"Video descargado: {best_quality['link']}")
            except Exception as e:
                logger.warning(f"Error procesando video: {str(e)}")
        
        if not video_paths:
            logger.error("No se pudo descargar ningún video")
            raise ValueError("No se pudo descargar ningún video")
        
        # 5. Procesar videos
        logger.info("Procesando videos descargados...")
        clips = []
        current_duration = 0
        
        for path in video_paths:
            if current_duration >= audio_duration:
                break
                
            try:
                clip = VideoFileClip(path)
                usable_duration = min(clip.duration, 10)
                
                if usable_duration > 1:
                    clips.append(clip.subclip(0, usable_duration))
                    current_duration += usable_duration
                    logger.debug(f"Clip añadido: {usable_duration:.1f}s (total: {current_duration:.1f}/{audio_duration:.1f}s)")
            except Exception as e:
                logger.warning(f"Error procesando video {path}: {str(e)}")
        
        if not clips:
            logger.error("No hay clips válidos para crear el video")
            raise ValueError("No hay clips válidos para crear el video")
        
        video_base = concatenate_videoclips(clips, method="compose")
        logger.info(f"Duración base del video: {video_base.duration:.2f}s")
        
        if video_base.duration < audio_duration:
            num_repeats = math.ceil(audio_duration / video_base.duration)
            logger.info(f"Repitiendo video {num_repeats} veces para ajustar duración")
            video_base = concatenate_videoclips([video_base] * num_repeats).subclip(0, audio_duration)
        
        # 6. Manejar música de fondo
        logger.info("Procesando audio...")
        final_audio = audio_tts
        
        if musica_file:
            try:
                music_path = os.path.join(temp_dir, "musica.mp3")
                shutil.copyfile(musica_file, music_path)
                temp_files.append(music_path)
                logger.info(f"Música copiada a: {music_path}")
                
                musica_audio = AudioFileClip(music_path)
                logger.debug(f"Duración música original: {musica_audio.duration:.2f}s")
                
                if musica_audio.duration < audio_duration:
                    musica_audio = loop_audio_to_length(musica_audio, audio_duration)
                    logger.debug(f"Música looped: {musica_audio.duration:.2f}s")
                
                final_audio = CompositeAudioClip([
                    musica_audio.volumex(0.3),
                    audio_tts.volumex(1.0)
                ])
                logger.info("Mezcla de audio completada")
            except Exception as e:
                logger.warning(f"Error procesando música: {str(e)}")
        
        # 7. Crear video final
        logger.info("Renderizando video final...")
        video_final = video_base.set_audio(final_audio)
        output_path = os.path.join(temp_dir, "final_video.mp4")
        
        video_final.write_videofile(
            output_path,
            fps=24,
            threads=4,
            codec="libx264",
            audio_codec="aac",
            preset="medium",
            logger=None
        )
        
        total_time = (datetime.now() - start_time).total_seconds()
        logger.info(f"VIDEO FINALIZADO: {output_path} | Tiempo total: {total_time:.2f}s")
        return output_path
        
    except Exception as e:
        logger.error(f"ERROR EN CREAR_VIDEO: {str(e)}", exc_info=True)
        raise
    finally:
        logger.info("Limpiando archivos temporales...")
        for path in temp_files:
            try:
                if os.path.isfile(path):
                    os.remove(path)
            except Exception as e:
                logger.warning(f"No se pudo eliminar {path}: {str(e)}")
        
        try:
            shutil.rmtree(temp_dir, ignore_errors=True)
        except Exception as e:
            logger.warning(f"No se pudo eliminar {temp_dir}: {str(e)}")

# [FUNCIÓN RUN_APP ORIGINAL CON LOGS]
def run_app(prompt_type, prompt_ia, prompt_manual, musica_file):
    logger.info("="*80)
    logger.info("SOLICITUD RECIBIDA EN INTERFAZ")
    input_text = prompt_ia if prompt_type == "Generar Guion con IA" else prompt_manual
    
    if not input_text.strip():
        logger.warning("Texto de entrada vacío")
        return None, "Por favor ingresa texto"
    
    try:
        logger.info("Iniciando creación de video...")
        video_path = crear_video(prompt_type, input_text, musica_file)
        logger.info("Video creado exitosamente")
        return video_path, "✅ Video generado exitosamente"
    except ValueError as ve:
        logger.warning(f"Error de validación: {str(ve)}")
        return None, f"⚠️ {ve}"
    except Exception as e:
        logger.error(f"Error crítico: {str(e)}", exc_info=True)
        return None, f"❌ Error: {str(e)}"

# [INTERFAZ DE GRADIO ORIGINAL COMPLETA]
with gr.Blocks(title="Generador de Videos con IA", theme=gr.themes.Soft(), css="""
    .gradio-container {max-width: 800px; margin: auto;}
    h1 {text-align: center;}
    """) as app:
    
    gr.Markdown("# 🎬 Generador Automático de Videos con IA")
    
    with gr.Row():
        with gr.Column():
            prompt_type = gr.Radio(
                ["Generar Guion con IA", "Usar Mi Guion"], 
                label="Método de Entrada",
                value="Generar Guion con IA"
            )
            
            with gr.Column(visible=True) as ia_guion_column:
                prompt_ia = gr.Textbox(
                    label="Tema para IA", 
                    lines=2,
                    placeholder="Ej: Un paisaje natural con montañas y ríos...",
                    max_lines=4
                )
            
            with gr.Column(visible=False) as manual_guion_column:
                prompt_manual = gr.Textbox(
                    label="Tu Guion Completo", 
                    lines=5,
                    placeholder="Ej: En este video exploraremos los misterios del océano...",
                    max_lines=10
                )
            
            musica_input = gr.Audio(
                label="Música de fondo (opcional)",
                type="filepath",
                interactive=True
            )
            
            generate_btn = gr.Button("✨ Generar Video", variant="primary")
        
        with gr.Column():
            video_output = gr.Video(
                label="Video Generado", 
                interactive=False,
                height=400
            )
            status_output = gr.Textbox(
                label="Estado", 
                interactive=False,
                show_label=False,
                placeholder="Esperando acción..."
            )

    prompt_type.change(
        lambda x: (gr.update(visible=x == "Generar Guion con IA"), 
                   gr.update(visible=x == "Usar Mi Guion")),
        inputs=prompt_type,
        outputs=[ia_guion_column, manual_guion_column]
    )

    generate_btn.click(
        lambda: (None, "⏳ Procesando... (esto puede tomar 2-5 minutos)"),
        outputs=[video_output, status_output],
        queue=False
    ).then(
        run_app,
        inputs=[prompt_type, prompt_ia, prompt_manual, musica_input],
        outputs=[video_output, status_output]
    )

    gr.Markdown("### Instrucciones:")
    gr.Markdown("""
    1. **Selecciona el tipo de entrada**: 
        - "Generar Guion con IA": Describe un tema
        - "Usar Mi Guion": Escribe tu guion completo
    2. **Sube música** (opcional): Selecciona un archivo de audio
    3. **Haz clic en Generar Video"
    4. Espera a que se procese el video (puede tomar varios minutos)
    """)

if __name__ == "__main__":
    logger.info("Iniciando aplicación Gradio...")
    try:
        app.launch(server_name="0.0.0.0", server_port=7860)
    except Exception as e:
        logger.critical(f"No se pudo iniciar la app: {str(e)}", exc_info=True)
        raise