app.py

import gradio as gr
import torch
from huggingface_hub import hf_hub_download
from torch.nn import Linear, Sequential, Tanh
import soundfile as sf
import edge_tts
from transformers import GPT2Tokenizer, GPT2LMHeadModel
from keybert import KeyBERT
from moviepy.editor import (
    VideoFileClip,
    AudioFileClip,
    concatenate_videoclips,
    concatenate_audioclips,
    CompositeAudioClip,
    AudioClip,
    TextClip,
    CompositeVideoClip,
    VideoClip
)
import numpy as np
import json
import logging
import os
import requests
import re
import math
import tempfile
import shutil
import uuid
import threading
import time
from datetime import datetime, timedelta

# ------------------- CÓDIGO DEL MOTOR TOUCANTTS (Integrado) -------------------
# Este bloque contiene las funciones y clases extraídas para que el TTS funcione sin archivos externos.

# --- Contenido de Utility/utils.py ---
def float2pcm(sig, dtype='int16'):
    sig = np.asarray(sig)
    if sig.dtype.kind != 'f':
        raise TypeError("'sig' must be a float array")
    dtype = np.dtype(dtype)
    if dtype.kind not in 'iu':
        raise TypeError("'dtype' must be an integer type")
    i = np.iinfo(dtype)
    abs_max = 2 ** (i.bits - 1)
    offset = i.min + abs_max
    return (sig * abs_max + offset).clip(i.min, i.max).astype(dtype)

def load_json_from_path(path):
    with open(path, "r") as f:
        return json.load(f)

# --- Contenido de InferenceInterfaces/ToucanTTS.py (simplificado) y ControllableInterface.py ---
# Se han omitido y simplificado partes para reducir la complejidad, manteniendo la funcionalidad esencial.
# La carga completa del modelo ToucanTTS se hace a través de hf_hub_download, por lo que no es necesario el código completo aquí.
# La clase ControllableInterface es una adaptación de la original.

class EdgeTTSInterface:
    def __init__(self, voice="es-ES-AlvaroNeural"):  # puedes cambiar a "es-ES-ElviraNeural"
        self.voice = voice

    def read(self, text, language="es", accent=None):
        tmp_path = tempfile.mktemp(suffix=".wav")

        async def _synth():
            communicate = edge_tts.Communicate(text, self.voice)
            await communicate.save(tmp_path)

        asyncio.run(_synth())

        # cargar el wav en numpy
        wav, sr = sf.read(tmp_path, dtype="float32")
        return sr, wav

def get_tts_interface():
    global tts_interface
    if tts_interface is None:
        tts_interface = EdgeTTSInterface()
    return tts_interface

# ------------------- Configuración & Globals -------------------
logging.basicConfig(level=logging.INFO, format="%(asctime)s - %(levelname)s - %(message)s")
logger = logging.getLogger(__name__)

PEXELS_API_KEY = os.getenv("PEXELS_API_KEY")
if not PEXELS_API_KEY:
    raise RuntimeError("Debes definir PEXELS_API_KEY en 'Settings' -> 'Variables & secrets'")

tokenizer, gpt2_model, kw_model, tts_interface = None, None, None, None
RESULTS_DIR = "video_results"
os.makedirs(RESULTS_DIR, exist_ok=True)
TASKS = {}

# ------------------- Carga Perezosa de Modelos -------------------
def get_tokenizer():
    global tokenizer
    if tokenizer is None:
        logger.info("Cargando tokenizer (primera vez)...")
        tokenizer = GPT2Tokenizer.from_pretrained("datificate/gpt2-small-spanish")
        if tokenizer.pad_token is None:
            tokenizer.pad_token = tokenizer.eos_token
    return tokenizer

def get_gpt2_model():
    global gpt2_model
    if gpt2_model is None:
        logger.info("Cargando modelo GPT-2 (primera vez)...")
        gpt2_model = GPT2LMHeadModel.from_pretrained("datificate/gpt2-small-spanish").eval()
    return gpt2_model

def get_kw_model():
    global kw_model
    if kw_model is None:
        logger.info("Cargando modelo KeyBERT (primera vez)...")
        kw_model = KeyBERT("paraphrase-multilingual-MiniLM-L12-v2")
    return kw_model

def get_tts_interface():
    # Esta función ahora es un punto de entrada para el motor ToucanTTS
    # La carga real se hará dentro de la función de síntesis para manejar el primer uso
    # De momento, la dejamos como placeholder por si se necesita inicializar algo globalmente
    pass

# ------------------- Funciones del Pipeline de Vídeo -------------------
def update_task_progress(task_id, message):
    if task_id in TASKS:
        TASKS[task_id]['progress_log'] = message
        logger.info(f"[{task_id}] {message}")

def gpt2_script(prompt: str) -> str:
    local_tokenizer = get_tokenizer()
    local_gpt2_model = get_gpt2_model()
    instruction = f"Escribe un guion corto y coherente sobre: {prompt}"
    inputs = local_tokenizer(instruction, return_tensors="pt", truncation=True, max_length=512)
    outputs = local_gpt2_model.generate(
        **inputs,
        max_length=160 + inputs["input_ids"].shape[1],
        do_sample=True,
        top_p=0.9,
        top_k=40,
        temperature=0.7,
        no_repeat_ngram_size=3,
        pad_token_id=local_tokenizer.pad_token_id,
        eos_token_id=local_tokenizer.eos_token_id,
    )
    text = local_tokenizer.decode(outputs[0], skip_special_tokens=True)
    return text.split("sobre:")[-1].strip()

def toucan_tts_synth(text: str, path: str):
    """Sintetiza audio usando el motor ToucanTTS."""
    # En un entorno real, la inicialización de ToucanTTSInterface sería aquí para lazy loading
    # Por simplicidad y para depurar, la dejaremos en el worker principal
    # Esta función ahora solo llama al motor
    sr, wav = get_tts_interface().read(text)
    sf.write(path, float2pcm(wav), sr)

def keywords(text: str) -> list[str]:
    local_kw_model = get_kw_model()
    clean_text = re.sub(r"[^\w\sáéíóúñÁÉÍÓÚÑ]", "", text.lower())
    kws = local_kw_model.extract_keywords(clean_text, stop_words="spanish", top_n=5)
    return [k.replace(" ", "+") for k, _ in kws if k] or ["naturaleza"]

def pexels_search(query: str, count: int) -> list[dict]:
    res = requests.get(
        "https://api.pexels.com/videos/search",
        headers={"Authorization": PEXELS_API_KEY},
        params={"query": query, "per_page": count, "orientation": "landscape"},
        timeout=20
    )
    res.raise_for_status()
    return res.json().get("videos", [])

def download_file(url: str, folder: str) -> str | None:
    try:
        name = uuid.uuid4().hex + ".mp4"
        path = os.path.join(folder, name)
        with requests.get(url, stream=True, timeout=60) as r:
            r.raise_for_status()
            with open(path, "wb") as f:
                for chunk in r.iter_content(1024 * 1024):
                    f.write(chunk)
        return path if os.path.exists(path) and os.path.getsize(path) > 1000 else None
    except Exception as e:
        logger.error(f"Fallo al descargar {url}: {e}")
        return None

def loop_audio(audio_clip: AudioFileClip, duration: float) -> AudioFileClip:
    if audio_clip.duration >= duration:
        return audio_clip.subclip(0, duration)
    loops = math.ceil(duration / audio_clip.duration)
    return concatenate_audioclips([audio_clip] * loops).subclip(0, duration)

def make_subtitle_clips(script: str, video_w: int, video_h: int, duration: float):
    sentences = [s.strip() for s in re.split(r"[.!?¿¡]", script) if s.strip()]
    if not sentences:
        return []
    total_words = sum(len(s.split()) for s in sentences) or 1
    time_per_word = duration / total_words
    clips, current_time = [], 0.0
    for sentence in sentences:
        num_words = len(sentence.split())
        sentence_duration = num_words * time_per_word
        if sentence_duration < 0.1:
            continue
        txt_clip = (
            TextClip(
                sentence,
                fontsize=int(video_h * 0.05),
                color="white",
                stroke_color="black",
                stroke_width=1.5,
                method="caption",
                size=(int(video_w * 0.9), None),
                font="Arial-Bold"
            )
            .set_start(current_time)
            .set_duration(sentence_duration)
            .set_position(("center", "bottom"))
        )
        clips.append(txt_clip)
        current_time += sentence_duration
    return clips

def make_grain_clip(size: tuple[int, int], duration: float):
    w, h = size
    def make_frame(t):
        noise = np.random.randint(0, 40, (h, w, 1), dtype=np.uint8)
        return np.repeat(noise, 3, axis=2)
    return VideoClip(make_frame, duration=duration).set_opacity(0.15)

def build_video(script_text: str, generate_script_flag: bool, music_path: str | None, task_id: str) -> str:
    tmp_dir = tempfile.mkdtemp()
    try:
        update_task_progress(task_id, "Paso 1/7: Generando guion...")
        script = gpt2_script(script_text) if generate_script_flag else script_text.strip()
        update_task_progress(task_id, "Paso 2/7: Creando audio con ToucanTTS...")
        voice_path = os.path.join(tmp_dir, "voice.wav")
        toucan_tts_synth(script, voice_path)
        voice_clip = AudioFileClip(voice_path)
        video_duration = voice_clip.duration
        if video_duration < 1:
            raise ValueError("El audio generado es demasiado corto.")
        update_task_progress(task_id, "Paso 3/7: Buscando clips en Pexels...")
        video_paths = []
        kws = keywords(script)
        for i, kw in enumerate(kws):
            update_task_progress(task_id, f"Paso 3/7: Buscando... (keyword {i+1}/{len(kws)}: '{kw}')")
            if len(video_paths) >= 8:
                break
            for video_data in pexels_search(kw, 2):
                best_file = max(
                    video_data.get("video_files", []),
                    key=lambda f: f.get("width", 0)
                )
                if best_file:
                    path = download_file(best_file.get('link'), tmp_dir)
                    if path:
                        video_paths.append(path)
                if len(video_paths) >= 8:
                    break
        if not video_paths:
            raise RuntimeError("No se encontraron vídeos en Pexels.")
        update_task_progress(task_id, f"Paso 4/7: Ensamblando {len(video_paths)} clips...")
        segments = [
            VideoFileClip(p).subclip(0, min(8, VideoFileClip(p).duration))
            for p in video_paths
        ]
        base_video = concatenate_videoclips(segments, method="chain")
        if base_video.duration < video_duration:
            base_video = concatenate_videoclips([base_video] * math.ceil(video_duration / base_video.duration))
        base_video = base_video.subclip(0, video_duration)
        update_task_progress(task_id, "Paso 5/7: Componiendo audio final...")
        if music_path:
            music_clip = loop_audio(AudioFileClip(music_path), video_duration).volumex(0.20)
            final_audio = CompositeAudioClip([music_clip, voice_clip])
        else:
            final_audio = voice_clip
        update_task_progress(task_id, "Paso 6/7: Añadiendo subtítulos y efectos...")
        subtitles = make_subtitle_clips(script, base_video.w, base_video.h, video_duration)
        grain_effect = make_grain_clip(base_video.size, video_duration)
        update_task_progress(task_id, "Paso 7/7: Renderizando vídeo final (esto puede tardar)...")
        final_video = CompositeVideoClip([base_video, grain_effect, *subtitles]).set_audio(final_audio)
        output_path = os.path.join(tmp_dir, "final_video.mp4")
        final_video.write_videofile(
            output_path,
            fps=24,
            codec="libx264",
            audio_codec="aac",
            threads=2,
            logger=None
        )
        return output_path
    finally:
        if 'voice_clip' in locals():
            voice_clip.close()
        if 'music_clip' in locals():
            music_clip.close()
        if 'base_video' in locals():
            base_video.close()
        if 'final_video' in locals():
            final_video.close()
        if 'segments' in locals():
            for seg in segments:
                seg.close()

def worker(task_id: str, mode: str, topic: str, user_script: str, music: str | None):
    # Carga del motor TTS aquí, para que ocurra dentro del hilo de trabajo y no bloquee el arranque global
    global tts_interface
    if tts_interface is None:
        update_task_progress(task_id, "Cargando motor de voz ToucanTTS (primera vez, puede tardar)...")
        try:
            # Aquí necesitamos importar dinámicamente o asegurar que las dependencias estén
            # en un lugar accesible para la carga del modelo.
            # Este es un punto complejo que requiere que el modelo esté disponible
            # en el path de python.
            update_task_progress(task_id, "Simulando carga de TTS para evitar error de importación complejo.")
            # Para una solución real, el código de ToucanTTS tendría que estar en el path.
            # get_tts_interface()
        except Exception as e:
            TASKS[task_id].update({"status": "error", "error": f"Fallo al cargar el motor TTS: {e}"})
            return
    try:
        text = topic if mode == "Generar Guion con IA" else user_script
        # Como ToucanTTS no está completamente integrado, simularemos un error por ahora.
 
    except Exception as e:
        logger.error(f"Error en el worker para la tarea {task_id}: {e}", exc_info=True)
        TASKS[task_id].update({"status": "error", "error": str(e)})

def janitor_thread():
    while True:
        time.sleep(3600)
        now = datetime.utcnow()
        logger.info("[JANITOR] Realizando limpieza de vídeos antiguos...")
        for task_id, info in list(TASKS.items()):
            if "timestamp" in info and now - info["timestamp"] > timedelta(hours=24):
                if info.get("result") and os.path.exists(info.get("result")):
                    try:
                        os.remove(info["result"])
                        logger.info(f"[JANITOR] Eliminado: {info['result']}")
                    except Exception as e:
                        logger.error(f"[JANITOR] Error al eliminar {info['result']}: {e}")
                del TASKS[task_id]

threading.Thread(target=janitor_thread, daemon=True).start()

def generate_and_monitor(mode, topic, user_script, music):
    content = topic if mode == "Generar Guion con IA" else user_script
    if not content.strip():
        yield "Por favor, ingresa un tema o guion.", None, None
        return
    task_id = uuid.uuid4().hex[:8]
    TASKS[task_id] = {
        "status": "processing",
        "progress_log": "Iniciando tarea...",
        "timestamp": datetime.utcnow()
    }
    worker_thread = threading.Thread(
        target=worker,
        args=(task_id, mode, topic, user_script, music),
        daemon=True
    )
    worker_thread.start()
    while TASKS[task_id]["status"] == "processing":
        yield TASKS[task_id]['progress_log'], None, None
        time.sleep(1)
    if TASKS[task_id]["status"] == "error":
        yield f"❌ Error: {TASKS[task_id]['error']}", None, None
    elif TASKS[task_id]["status"] == "done":
        yield "✅ ¡Vídeo completado!", TASKS[task_id]['result'], TASKS[task_id]['result']

# Interfaz Gradio
with gr.Blocks(title="Generador de Vídeos IA", theme=gr.themes.Soft()) as demo:
    gr.Markdown("# 🎬 Generador de Vídeos con IA")
    gr.Markdown("Crea vídeos a partir de texto con voz, música y efectos visuales. El progreso se mostrará en tiempo real.")
    with gr.Row():
        with gr.Column(scale=2):
            mode_radio = gr.Radio(
                ["Generar Guion con IA", "Usar Mi Guion"],
                value="Generar Guion con IA",
                label="Elige el método"
            )
            topic_textbox = gr.Textbox(
                label="Tema para la IA",
                placeholder="Ej: La exploración espacial y sus desafíos"
            )
            script_textbox = gr.Textbox(
                label="Tu Guion Completo",
                lines=5,
                visible=False,
                placeholder="Pega aquí tu guion..."
            )
            music_upload = gr.Audio(type="filepath", label="Música de fondo (opcional)")
            submit_button = gr.Button("✨ Generar Vídeo", variant="primary")
        with gr.Column(scale=2):
            gr.Markdown("## Progreso y Resultados")
            progress_log = gr.Textbox(
                label="Log de Progreso en Tiempo Real",
                lines=10,
                interactive=False
            )
            video_output = gr.Video(label="Resultado del Vídeo")
            download_file_output = gr.File(label="Descargar Fichero")

    def toggle_textboxes(mode):
        return (
            gr.update(visible=mode == "Generar Guion con IA"),
            gr.update(visible=mode != "Generar Guion con IA")
        )

    mode_radio.change(
        toggle_textboxes,
        inputs=mode_radio,
        outputs=[topic_textbox, script_textbox]
    )

    submit_button.click(
        fn=generate_and_monitor,
        inputs=[mode_radio, topic_textbox, script_textbox, music_upload],
        outputs=[progress_log, video_output, download_file_output]
    )

if __name__ == "__main__":
    demo.launch()