app.py

import os
import requests
import edge_tts
import gradio as gr
from moviepy.editor import *
from moviepy.video.fx.all import resize, scroll
from PIL import Image
import io
import asyncio
import json

# 1. Descargar imágenes/videos de stock (Pexels)
def get_stock_media(query, is_video=False):
    API_KEY = os.getenv("PEXELS_API_KEY")  # Configurar en HF Secrets
    if not API_KEY:
        raise ValueError("¡Falta la API Key de Pexels! Añádela en los Secrets de Hugging Face.")
    
    url = f"https://api.pexels.com/v1/{'videos' if is_video else 'photos'}/search?query={query}&per_page=1"
    headers = {"Authorization": API_KEY}
    response = requests.get(url, headers=headers).json()
    
    if is_video:
        video_url = response["videos"][0]["video_files"][0]["link"]
        return requests.get(video_url).content
    else:
        image_url = response["photos"][0]["src"]["large"]
        return Image.open(io.BytesIO(requests.get(image_url).content))

# 2. Generar voz con Edge TTS
async def generate_voice(text, voice="es-ES-AlvaroNeural", output_path="voice.mp3"):
    communicate = edge_tts.Communicate(text=text, voice=voice)
    await communicate.save(output_path)

# 3. Añadir música de fondo (20% volumen, loop automático)
def add_background_music(audio_clip, music_path=None, volume=0.2):
    if not music_path:
        return audio_clip
    music = AudioFileClip(music_path).volumex(volume)
    if music.duration < audio_clip.duration:
        music = music.loop(duration=audio_clip.duration)
    return CompositeAudioClip([audio_clip, music.set_start(0)])

# 4. Efectos de movimiento/zoom para imágenes
def apply_effects(clip, zoom_factor=1.05, effect_duration=2):
    return clip.resize(zoom_factor).set_position('center').fx(scroll, h=50, w=50)

# 5. Subtítulos dinámicos (aparecen progresivamente)
def generate_subtitles(text, duration, fontsize=30, color="white", stroke_color="black"):
    words = text.split()
    word_duration = duration / max(len(words), 1)  # Evitar división por cero
    clips = []
    for i, word in enumerate(words):
        txt_clip = TextClip(
            " ".join(words[:i+1]),
            fontsize=fontsize,
            color=color,
            stroke_color=stroke_color,
            font="Arial-Bold",
            size=(None, None),
            method="caption"
        ).set_start(i * word_duration).set_duration(word_duration)
        clips.append(txt_clip.set_position(("center", "bottom")))
    return concatenate_videoclips(clips)

# 6. Función principal
async def generate_video(script_json, voice_model, music_file=None):
    try:
        script = json.loads(script_json)
    except json.JSONDecodeError:
        raise gr.Error("¡Formato de script inválido! Usa JSON como en el ejemplo.")
    
    clips = []
    for i, scene in enumerate(script):
        img = get_stock_media(scene["prompt"])
        img_path = f"scene_{i}.jpg"
        img.save(img_path)
        
        voice_path = f"voice_{i}.mp3"
        await generate_voice(scene["text"], voice_model, voice_path)
        
        audio = AudioFileClip(voice_path)
        clip = ImageClip(img_path).set_duration(audio.duration)
        clip = apply_effects(clip)
        
        subtitles = generate_subtitles(scene["text"], audio.duration)
        final_clip = CompositeVideoClip([clip, subtitles]).set_audio(audio)
        clips.append(final_clip)
    
    final_video = concatenate_videoclips(clips)
    if music_file:
        final_video.audio = add_background_music(final_video.audio, music_file)
    
    output_path = "final_video.mp4"
    final_video.write_videofile(output_path, fps=24, codec="libx264", threads=4)
    return output_path

# 7. Interfaz Gradio
def ui(script_json, voice_model, music_file=None):
    loop = asyncio.new_event_loop()
    asyncio.set_event_loop(loop)
    try:
        output_video = loop.run_until_complete(generate_video(script_json, voice_model, music_file))
    except Exception as e:
        raise gr.Error(f"Error: {str(e)}")
    finally:
        loop.close()
    return output_video

# Voces Edge TTS (puedes añadir más)
voices = list(edge_tts.list_voices())

with gr.Blocks(title="Generador de Videos con IA") as demo:
    gr.Markdown("## 🎥 Generador de Videos con IA (Gratis)")
    with gr.Row():
        script_input = gr.Textbox(
            label="Script (JSON)",
            placeholder='[{"prompt": "paisaje", "text": "Texto aquí..."}]',
            lines=5
        )
    with gr.Row():
        voice_dropdown = gr.Dropdown(choices=voices, label="Voz", value="es-ES-AlvaroNeural")
        music_upload = gr.File(label="Música de fondo (opcional)", type="filepath")
    generate_btn = gr.Button("Generar Video")
    output_video = gr.Video(label="Resultado", format="mp4")
    
    gr.Examples(
        examples=[[
            '[{"prompt": "ciudad futurista", "text": "Bienvenidos al futuro."}]',
            "es-ES-AlvaroNeural",
            None
        ]],
        inputs=[script_input, voice_dropdown, music_upload],
        outputs=output_video
    )
    
    generate_btn.click(
        fn=ui,
        inputs=[script_input, voice_dropdown, music_upload],
        outputs=output_video,
    )

demo.launch(debug=True)