app.py

## Versión Alfa 1.0
import gradio as gr
import pandas as pd
import config
import os
import time
import threading
import shutil
from core import PDFEngine

os.environ["GRADIO_TEMP_DIR"] = config.TEMP_DIR

engine = PDFEngine()

# --- SEGURIDAD: GARBAGE COLLECTOR ---
# NOTA PARA DUPLICADORES DEL ESPACIO:
# Esta función limpia los archivos cada minuto. Por defecto está en modo SILENCIOSO.
# Si quieres ver qué está pasando, DESCOMENTA las líneas que empiezan por "#print".
def cleanup_cron():
    """
    Revisa cada minuto. Borra archivos Y carpetas mayores a 5 minutos.
    """
    print("[INIT] 🛡️  Sistema de seguridad y auto-borrado ACTIVO.")
    
    while True:
        try:
            time.sleep(60) 
            
            LIMIT_MINUTES = 5
            cutoff = time.time() - (LIMIT_MINUTES * 60)
            
            #print(f"--- [SEGURIDAD] Ronda de limpieza: {time.strftime('%H:%M:%S')} ---")
            
            if os.path.exists(config.TEMP_DIR):
                items = os.listdir(config.TEMP_DIR)
                
                if not items:
                    #print("[ESTADO] Carpeta limpia (0 elementos).")
                    pass
                else:
                    #print(f"[ESTADO] Analizando {len(items)} elementos...")
                    pass
                
                for filename in items:
                    filepath = os.path.join(config.TEMP_DIR, filename)
                    
                    if len(filename) > 8:
                        masked = f"{filename[:4]}****{os.path.splitext(filename)[1]}"
                    else:
                        masked = filename

                    try:
                        file_time = os.path.getmtime(filepath)
                        age_sec = time.time() - file_time
                        is_expired = file_time < cutoff
                    except FileNotFoundError:
                        continue

                    # CASO 1: ARCHIVO
                    if os.path.isfile(filepath):
                        if is_expired:
                            try:
                                os.remove(filepath)
                                #print(f"❌ [BORRADO] Archivo {masked}")
                            except Exception as e:
                                pass
                        else:
                            #print(f"✅ [VIGENTE] Archivo {masked}")
                            pass
                    
                    # CASO 2: CARPETA
                    elif os.path.isdir(filepath):
                        if is_expired:
                            try:
                                shutil.rmtree(filepath)
                                #print(f"🗑️ [LIMPIEZA] Carpeta {masked} eliminada")
                            except Exception as e:
                                pass
                        else:
                            #print(f"📂 [VIGENTE] Carpeta {masked}")
                            pass
            else:
                #print("[INFO] Carpeta temporal aún no creada.")
                pass
                
        except Exception as e:
            print(f"[CRITICAL] Error en limpieza: {e}")

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

# --- GENERADOR DE ENLACE ---
def get_duplicate_html():
    space_id = os.environ.get('SPACE_ID', None)
    url = f"https://huggingface.co/spaces/{space_id}?duplicate=true" if space_id else "https://huggingface.co/spaces?duplicate=true"
    return f"""
    <div style="display: flex; align-items: center; gap: 10px; margin-bottom: 20px; background-color: #f9fafb; padding: 10px; border-radius: 8px; border: 1px solid #e5e7eb;">
        <a href="{url}" target="_blank">
            <img src="https://huggingface.co/datasets/huggingface/badges/raw/main/duplicate-this-space-sm.svg" alt="Duplicate Space" style="height: 30px;">
        </a>
        <span style="font-size: 0.9em; color: #4b5563;">
            ⚡ <b>¿Va lento o quieres seguridad adicional?</b> Haz clic para duplicar este espacio y tener tu propia instancia privada.
        </span>
    </div>
    """

# --- WRAPPERS ---
def update_file_list(files):
    if not files: return pd.DataFrame(), ""
    data = [[i, f.split("/")[-1]] for i, f in enumerate(files)]
    return pd.DataFrame(data, columns=["ID", "Archivo"]), ",".join([str(i) for i in range(len(files))])

def process_merge(files, order_str, use_numbering):
    if not files: return None
    try:
        indices = [int(x.strip()) for x in order_str.split(",") if x.strip().isdigit()]
        return engine.merge_pdfs(files, indices, use_numbering)
    except Exception as e: raise gr.Error(str(e))

def load_info(f):
    if not f: return None, 0, gr.update(visible=False)
    i = engine.get_pdf_info(f)
    return f"📄 {i['name']} ({i['pages']} págs)", i['pages'], gr.update(visible=True)

def update_split_preview(f, r, t):
    if not f or not r: return None
    kp = engine.get_preview_indices_from_string(r, t)
    if not kp: return None
    return [(engine.generate_preview(f, p), f"Pág {p}") for p in kp[:8] if engine.generate_preview(f, p)]

def process_split(f, r):
    if not f: return None
    try: return engine.split_pdf_custom(f, r)
    except Exception as e: raise gr.Error(str(e))

def process_reorder(f, o):
    if not f: return None
    try: return engine.reorder_pages(f, o)
    except Exception as e: raise gr.Error(str(e))

def process_compare(fa, fb):
    if not fa or not fb: return None
    try: return engine.compare_pdfs_text(fa, fb)
    except Exception as e: raise gr.Error(str(e))

def process_compress(f, l):
    if not f: return None
    lvls = {"Baja (Máxima calidad)": 1, "Media (Recomendado - eBook)": 3, "Alta (Pantalla - 72dpi)": 4}
    try: return engine.compress_pdf(f, lvls.get(l, 3))
    except Exception as e: raise gr.Error(str(e))

def update_rot_preview(f, a_lbl):
    if not f: return None
    a = 0
    if "90" in a_lbl: a = 90
    elif "180" in a_lbl: a = 180
    elif "270" in a_lbl: a = 270
    return engine.get_rotated_preview(f, a)

def process_rotate(f, a_lbl):
    if not f: return None
    a = 0
    if "90" in a_lbl: a = 90
    elif "180" in a_lbl: a = 180
    elif "270" in a_lbl: a = 270
    if a == 0: return f.name
    try: return engine.rotate_pdf(f, a)
    except Exception as e: raise gr.Error(str(e))

def process_protect(f, p):
    if not f or not p: return None
    try: return engine.protect_pdf(f, p)
    except Exception as e: raise gr.Error(str(e))

def process_meta(f, t, a, s):
    if not f: return None
    try: return engine.update_metadata(f, t, a, s)
    except Exception as e: raise gr.Error(str(e))

def process_text(f):
    if not f: return None
    try: return engine.extract_text(f)
    except Exception as e: raise gr.Error(str(e))

def process_watermark(f, t):
    if not f or not t: return None
    try: return engine.add_watermark(f, t)
    except Exception as e: raise gr.Error(str(e))

def process_repair(f):
    if not f: return None
    try: return engine.repair_pdf(f)
    except Exception as e: raise gr.Error(str(e))

# WRAPPERS OFFICE
def process_word(f):
    if not f: return None
    try: return engine.pdf_to_word(f)
    except Exception as e: raise gr.Error(str(e))
def process_pptx(f):
    if not f: return None
    try: return engine.pdf_to_pptx(f)
    except Exception as e: raise gr.Error(str(e))
def process_p2i(f):
    if not f: return None
    try: return engine.pdf_to_images_zip(f)
    except Exception as e: raise gr.Error(str(e))


# --- UI LAYOUT ---
with gr.Blocks(title=config.APP_TITLE, theme=gr.themes.Soft()) as demo:
    
    gr.Markdown(f"# {config.APP_TITLE}")
    gr.Markdown("""
    Los archivos se procesan en memoria y se **autodestruyen tras 5 minutos**.
    """)
    
    gr.HTML(get_duplicate_html())

    with gr.Tabs():
        # 1. UNIR
        with gr.TabItem("Unir"):
            with gr.Row():
                with gr.Column(scale=1):
                    m_files = gr.File(file_count="multiple", label="Archivos", file_types=[".pdf"])
                with gr.Column(scale=2):
                    m_tbl = gr.Dataframe(headers=["ID", "Archivo"], interactive=False)
                    m_ord = gr.Textbox(label="Orden de los documentos según ID", placeholder="Ej: 0, 2, 1")
                    m_nums = gr.Checkbox(label="Numerar páginas (1 de X)", value=False)
                    m_btn = gr.Button("Unir PDF", variant="primary")
            m_out = gr.File(label="Resultado")
            m_files.change(update_file_list, m_files, [m_tbl, m_ord])
            m_btn.click(process_merge, [m_files, m_ord, m_nums], m_out)

        # 2. DIVIDIR / REORDENAR
        with gr.TabItem("Dividir / Reordenar"):
            dr_f = gr.File(label="PDF Origen", file_types=[".pdf"])
            dr_inf = gr.Markdown("")
            dr_pg = gr.State(0)
            with gr.Tabs():
                with gr.Tab("Extraer"):
                    gr.Markdown("Separa páginas en un ZIP.")
                    with gr.Row():
                        with gr.Column():
                            s_rng = gr.Textbox(label="Rango", placeholder="Ej: 1-3, 5")
                            with gr.Row():
                                s_prv = gr.Button("Preview")
                                s_btn = gr.Button("Dividir (ZIP)", variant="primary")
                        with gr.Column():
                            s_gal = gr.Gallery(height=160, columns=4, object_fit="contain", label="Vista Previa")
                            s_out = gr.File(label="ZIP")
                    s_prv.click(update_split_preview, [dr_f, s_rng, dr_pg], s_gal)
                    s_btn.click(process_split, [dr_f, s_rng], s_out)
                with gr.Tab("Reordenar"):
                    gr.Markdown("Crea un PDF con nuevo orden.")
                    with gr.Row():
                        with gr.Column():
                            r_ord = gr.Textbox(label="Nuevo Orden", placeholder="Ej: 3, 1, 2, 4-10")
                            r_btn = gr.Button("Reordenar", variant="primary")
                        with gr.Column():
                            r_out = gr.File(label="PDF Reordenado")
                    r_btn.click(process_reorder, [dr_f, r_ord], r_out)
            dr_f.change(load_info, dr_f, [dr_inf, dr_pg, s_out])

        # 3. COMPRIMIR
        with gr.TabItem("Comprimir"):
            with gr.Row():
                with gr.Column():
                    c_f = gr.File(label="PDF Original", file_types=[".pdf"])
                    c_l = gr.Radio(["Baja (Máxima calidad)", "Media (Recomendado - eBook)", "Alta (Pantalla - 72dpi)"], label="Nivel", value="Media (Recomendado - eBook)")
                    c_b = gr.Button("Comprimir", variant="primary")
                with gr.Column():
                    c_out = gr.File(label="PDF Comprimido")
            c_b.click(process_compress, [c_f, c_l], c_out)

        # 4. CONVERTIR
        with gr.TabItem("Convertir Formatos"):
            with gr.Row():
                with gr.Column():
                    gr.Markdown("### A Word")
                    w_f = gr.File(label="PDF")
                    w_b = gr.Button("Convertir")
                    w_o = gr.File(label="DOCX")
                    w_b.click(process_word, w_f, w_o)
                with gr.Column():
                    gr.Markdown("### A Imágenes")
                    p2i_f = gr.File(label="PDF")
                    p2i_b = gr.Button("Extraer ZIP")
                    p2i_o = gr.File(label="ZIP")
                    p2i_b.click(process_p2i, p2i_f, p2i_o)
                with gr.Column():
                    gr.Markdown("### A PowerPoint")
                    p_f = gr.File(label="PDF")
                    p_b = gr.Button("Convertir")
                    p_o = gr.File(label="PPTX")
                    p_b.click(process_pptx, p_f, p_o)

        # 5. COMPARAR
        with gr.TabItem("Comparar"):
            gr.Markdown("Compara el **texto** de dos versiones. Descarga un informe con cambios.")
            with gr.Row():
                with gr.Column():
                    ca = gr.File(label="Versión A (Original)", file_types=[".pdf"])
                with gr.Column():
                    cb = gr.File(label="Versión B (Modificada)", file_types=[".pdf"])
            cb_btn = gr.Button("Generar Informe", variant="primary")
            co = gr.File(label="Informe PDF")
            cb_btn.click(process_compare, [ca, cb], co)

        # 6. EXTRAS
        with gr.TabItem("Extras"):
            with gr.Tab("Rotar"):
                with gr.Row():
                    with gr.Column():
                        rf = gr.File(label="PDF")
                        ra = gr.Radio(["0° (Original)", "90° (Derecha)", "180° (Invertir)", "270° (Izquierda)"], label="Rotación", value="0° (Original)")
                        rb = gr.Button("Rotar", variant="primary")
                    with gr.Column():
                        rp = gr.Image(label="Preview")
                        ro = gr.File(label="PDF Rotado")
                rf.change(update_rot_preview, [rf, ra], rp)
                ra.change(update_rot_preview, [rf, ra], rp)
                rb.click(process_rotate, [rf, ra], ro)
            
            with gr.Tab("Marca de Agua"):
                gr.Markdown("Añade una marca de agua diagonal en todas las páginas.")
                with gr.Row():
                    with gr.Column():
                        wf = gr.File(label="PDF")
                        wt = gr.Textbox(label="Texto Marca de Agua", placeholder="Ej: CONFIDENCIAL")
                        wb = gr.Button("Estampar", variant="primary")
                    with gr.Column():
                        wo = gr.File(label="PDF Marcado")
                wb.click(process_watermark, [wf, wt], wo)

            with gr.Tab("Reparar"):
                gr.Markdown("Intenta arreglar PDFs corruptos o dañados reescribiéndolos con Ghostscript.")
                with gr.Row():
                    with gr.Column():
                        repf = gr.File(label="PDF Dañado")
                        repb = gr.Button("Reparar", variant="primary")
                    with gr.Column():
                        repo = gr.File(label="PDF Reparado")
                repb.click(process_repair, repf, repo)

            with gr.Tab("Proteger"):
                with gr.Row():
                    with gr.Column():
                        pf = gr.File(label="PDF")
                        pp = gr.Textbox(type="password", label="Pass")
                        pb = gr.Button("Encriptar", variant="primary")
                    with gr.Column():
                        po = gr.File(label="Protegido")
                pb.click(process_protect, [pf, pp], po)
            
            with gr.Tab("Info/Texto"):
                with gr.Row():
                    with gr.Column():
                        tf = gr.File(label="PDF")
                        tb = gr.Button("Extraer Texto")
                        to = gr.File()
                        tb.click(process_text, tf, to)
                    with gr.Column():
                        mt = gr.Textbox(label="Título")
                        ma = gr.Textbox(label="Autor")
                        ms = gr.Textbox(label="Asunto")
                        mb = gr.Button("Actualizar Meta")
                        mo = gr.File()
                        mb.click(process_meta, [tf, mt, ma, ms], mo)

if __name__ == "__main__":
    demo.queue(default_concurrency_limit=2).launch(
        server_name="0.0.0.0", 
        server_port=7860
    )