app.py

import gradio as gr
from PIL import Image
import os
import tempfile

def optimize_image(image, png_optimize, jpeg_quality, jpeg_resolution, webp_quality):
    img = Image.open(image)
    
    original_size = os.path.getsize(image.name) / 1024  # tamaño en KB
    
    with tempfile.TemporaryDirectory() as tmpdirname:
        # 1. Compresión sin pérdida (PNG)
        lossless_output_path = os.path.join(tmpdirname, "lossless.png")
        img.save(lossless_output_path, format="PNG", optimize=png_optimize)
        lossless_size = os.path.getsize(lossless_output_path) / 1024
        lossless_diff = original_size - lossless_size
        lossless_img = Image.open(lossless_output_path)
        
        # 2. Compresión con pérdida (JPEG)
        lossy_output_path = os.path.join(tmpdirname, "lossy.jpg")
        img.save(lossy_output_path, format="JPEG", quality=jpeg_quality, optimize=True)
        lossy_size = os.path.getsize(lossy_output_path) / 1024
        lossy_diff = original_size - lossy_size
        lossy_img = Image.open(lossy_output_path)
        
        # 3. Reducción de resolución (JPEG)
        reduced_output_path = os.path.join(tmpdirname, "reduced_resolution.jpg")
        new_resolution = (img.width * jpeg_resolution // 100, img.height * jpeg_resolution // 100)
        reduced_img = img.resize(new_resolution, Image.LANCZOS)
        reduced_img.save(reduced_output_path, format="JPEG", quality=jpeg_quality, optimize=True)
        reduced_size = os.path.getsize(reduced_output_path) / 1024
        reduced_diff = original_size - reduced_size
        reduced_img = Image.open(reduced_output_path)

        # 4. Compresión con WebP (con pérdida)
        webp_lossy_output_path = os.path.join(tmpdirname, "lossy.webp")
        img.save(webp_lossy_output_path, format="WEBP", quality=webp_quality, optimize=True)
        webp_lossy_size = os.path.getsize(webp_lossy_output_path) / 1024
        webp_lossy_diff = original_size - webp_lossy_size
        webp_lossy_img = Image.open(webp_lossy_output_path)
        
        # Retornar las imágenes optimizadas, tamaños y rutas para descarga
        return [
            lossless_img, f"Sin pérdida: {lossless_size:.2f} KB ({-lossless_diff:.2f} KB)", lossless_output_path,
            lossy_img, f"Con pérdida: {lossy_size:.2f} KB ({-lossy_diff:.2f} KB)", lossy_output_path,
            reduced_img, f"Reducción de resolución: {reduced_size:.2f} KB ({-reduced_diff:.2f} KB)", reduced_output_path,
            webp_lossy_img, f"WebP con pérdida: {webp_lossy_size:.2f} KB ({-webp_lossy_diff:.2f} KB)", webp_lossy_output_path
        ]

def download_image(file_path):
    return gr.File.update(value=file_path, label="Descargar", visible=True)

with gr.Blocks() as demo:
    gr.Markdown("### Optimización de imágenes para la web")

    image_input = gr.File(label="Sube tu imagen", file_types=['image'])
    optimize_button = gr.Button("Optimizar")

    with gr.Row():
        with gr.Column():
            optimized_output1 = gr.Image(label="Optimización sin pérdida")
            png_optimize = gr.Checkbox(label="Optimizar PNG", value=True)
            optimized_size1 = gr.Text(value="", interactive=False, show_label=False)
            download_button1 = gr.Button("Descargar")
            download_file1 = gr.File(visible=False)

        with gr.Column():
            optimized_output2 = gr.Image(label="Optimización con pérdida (JPEG)")
            jpeg_quality = gr.Slider(label="Calidad JPEG", minimum=10, maximum=100, value=50, step=1)
            optimized_size2 = gr.Text(value="", interactive=False, show_label=False)
            download_button2 = gr.Button("Descargar")
            download_file2 = gr.File(visible=False)

        with gr.Column():
            optimized_output3 = gr.Image(label="Reducción de resolución (JPEG)")
            jpeg_resolution = gr.Slider(label="Resolución JPEG (%)", minimum=10, maximum=100, value=50, step=1)
            optimized_size3 = gr.Text(value="", interactive=False, show_label=False)
            download_button3 = gr.Button("Descargar")
            download_file3 = gr.File(visible=False)

        with gr.Column():
            optimized_output4 = gr.Image(label="Optimización WebP con pérdida")
            webp_quality = gr.Slider(label="Calidad WebP", minimum=10, maximum=100, value=50, step=1)
            optimized_size4 = gr.Text(value="", interactive=False, show_label=False)
            download_button4 = gr.Button("Descargar")
            download_file4 = gr.File(visible=False)

    optimize_button.click(
        fn=optimize_image,
        inputs=[image_input, png_optimize, jpeg_quality, jpeg_resolution, webp_quality],
        outputs=[
            optimized_output1, optimized_size1, download_file1,
            optimized_output2, optimized_size2, download_file2,
            optimized_output3, optimized_size3, download_file3,
            optimized_output4, optimized_size4, download_file4
        ]
    )

    download_button1.click(download_image, inputs=download_file1, outputs=download_file1)
    download_button2.click(download_image, inputs=download_file2, outputs=download_file2)
    download_button3.click(download_image, inputs=download_file3, outputs=download_file3)
    download_button4.click(download_image, inputs=download_file4, outputs=download_file4)

demo.launch()