app.py

import gc
from pathlib import Path

import gradio as gr
import matplotlib.cm as cm
import numpy as np
import spaces
import torch
import torch.nn.functional as F
from PIL import Image, ImageOps
from transformers import AutoImageProcessor, AutoModel

# Device configuration with memory management
DEVICE = "cuda" if torch.cuda.is_available() else "cpu"

MODEL_MAP = {
    "DINOv3 ViT-L/16 Satellite (493M)": "facebook/dinov3-vitl16-pretrain-sat493m",
    "DINOv3 ViT-L/16 LVD (1.7B web)": "facebook/dinov3-vitl16-pretrain-lvd1689m",
    "DINOv3 ViT-7B/16 Satellite": "facebook/dinov3-vit7b16-pretrain-sat493m",
}

DEFAULT_NAME = list(MODEL_MAP.keys())[0]
MAX_IMAGE_DIM = 720  # Maximum dimension for longer side

# Global model state
processor = None
model = None


def cleanup_memory():
    """Aggressive memory cleanup for model switching"""
    global processor, model

    if model is not None:
        del model
        model = None

    if processor is not None:
        del processor
        processor = None

    gc.collect()

    if torch.cuda.is_available():
        torch.cuda.empty_cache()


def compute_dynamic_size(height, width, max_dim=720, patch_size=16):
    """
    Compute new dimensions preserving aspect ratio with max_dim constraint.
    Ensures dimensions are divisible by patch_size for clean patch extraction.
    """
    # Determine scaling factor
    if height > width:
        scale = min(1.0, max_dim / height)
    else:
        scale = min(1.0, max_dim / width)

    # Compute new dimensions
    new_height = int(height * scale)
    new_width = int(width * scale)

    # Round to nearest multiple of patch_size for clean patches
    new_height = (new_height // patch_size) * patch_size
    new_width = (new_width // patch_size) * patch_size

    return new_height, new_width


def load_model(name):
    """Load model with CORRECT dtype"""
    global processor, model

    cleanup_memory()
    model_id = MODEL_MAP[name]

    processor = AutoImageProcessor.from_pretrained(model_id)

    model = AutoModel.from_pretrained(
        model_id,
        torch_dtype="auto",
    ).eval()

    param_count = sum(p.numel() for p in model.parameters()) / 1e9
    return f"Loaded: {name} | {param_count:.1f}B params | Ready"


# Initialize default model
load_model(DEFAULT_NAME)


def preprocess_image(img):
    """
    Custom preprocessing that respects aspect ratio and uses dynamic sizing.
    DINOv3's RoPE handles variable sizes beautifully - no need to constrain to 224x224!
    """
    # Convert to RGB if needed
    if img.mode != "RGB":
        img = img.convert("RGB")

    # Compute dynamic size
    orig_h, orig_w = img.height, img.width
    patch_size = model.config.patch_size
    new_h, new_w = compute_dynamic_size(orig_h, orig_w, MAX_IMAGE_DIM, patch_size)

    # Resize image
    img_resized = img.resize((new_w, new_h), Image.Resampling.BICUBIC)

    # Convert to tensor and normalize using the processor's normalization params
    img_array = np.array(img_resized).astype(np.float32) / 255.0

    # Apply ImageNet normalization (from processor config)
    mean = (
        processor.image_mean
        if hasattr(processor, "image_mean")
        else [0.485, 0.456, 0.406]
    )
    std = (
        processor.image_std
        if hasattr(processor, "image_std")
        else [0.229, 0.224, 0.225]
    )

    img_array = (img_array - mean) / std

    # Convert to tensor with correct shape: [1, C, H, W]
    img_tensor = torch.from_numpy(img_array).permute(2, 0, 1).unsqueeze(0).float()

    return img_tensor, new_h, new_w


@spaces.GPU(duration=60)
def _extract_grid(img):
    """Extract feature grid from image - now with dynamic sizing!"""
    global model

    with torch.inference_mode():
        # Move model to GPU for this call
        model = model.to("cuda")

        # Preprocess with dynamic sizing
        pv, img_h, img_w = preprocess_image(img)
        pv = pv.to(model.device)

        # Run inference - the model handles variable sizes perfectly!
        out = model(pixel_values=pv)
        last = out.last_hidden_state[0].to(torch.float32)

        # Extract features
        num_reg = getattr(model.config, "num_register_tokens", 0)
        p = model.config.patch_size

        # Calculate grid dimensions based on actual image size
        gh, gw = img_h // p, img_w // p

        feats = last[1 + num_reg :, :].reshape(gh, gw, -1).cpu()

        # Move model back to CPU before function exits
        model = model.cpu()
        torch.cuda.empty_cache()

    return feats, gh, gw, img_h, img_w


def _overlay(orig, heat01, alpha=0.55, box=None):
    """Create heatmap overlay"""
    H, W = orig.height, orig.width
    heat = Image.fromarray((heat01 * 255).astype(np.uint8)).resize((W, H))
    # Use turbo colormap - better for satellite imagery
    rgba = (cm.get_cmap("turbo")(np.asarray(heat) / 255.0) * 255).astype(np.uint8)
    ov = Image.fromarray(rgba, "RGBA")
    ov.putalpha(int(alpha * 255))
    base = orig.copy().convert("RGBA")
    out = Image.alpha_composite(base, ov)
    if box:
        from PIL import ImageDraw

        draw = ImageDraw.Draw(out, "RGBA")
        # Enhanced box visualization
        draw.rectangle(box, outline=(255, 255, 255, 255), width=3)
        draw.rectangle(
            (box[0] - 1, box[1] - 1, box[2] + 1, box[3] + 1),
            outline=(0, 0, 0, 200),
            width=1,
        )
    return out


def prepare(img):
    """Prepare image and extract features with dynamic sizing"""
    if img is None:
        return None

    base = ImageOps.exif_transpose(img.convert("RGB"))
    feats, gh, gw, img_h, img_w = _extract_grid(base)

    return {
        "orig": base,
        "feats": feats,
        "gh": gh,
        "gw": gw,
        "processed_h": img_h,
        "processed_w": img_w,
    }


def click(state, opacity, img_value, evt: gr.SelectData):
    """Handle click events for similarity visualization"""
    # If state wasn't prepared (e.g., Example selection), build it now
    if state is None and img_value is not None:
        state = prepare(img_value)

    if not state or evt.index is None:
        # Just show whatever is currently in the image component
        return img_value, state

    base, feats, gh, gw = state["orig"], state["feats"], state["gh"], state["gw"]

    x, y = evt.index
    px_x, px_y = base.width / gw, base.height / gh
    i = min(int(x // px_x), gw - 1)
    j = min(int(y // px_y), gh - 1)

    d = feats.shape[-1]
    grid = F.normalize(feats.reshape(-1, d), dim=1)
    v = F.normalize(feats[j, i].reshape(1, d), dim=1)
    sims = (grid @ v.T).reshape(gh, gw).numpy()

    smin, smax = float(sims.min()), float(sims.max())
    heat01 = (sims - smin) / (smax - smin + 1e-12)

    box = (int(i * px_x), int(j * px_y), int((i + 1) * px_x), int((j + 1) * px_y))
    overlay = _overlay(base, heat01, alpha=opacity, box=box)

    # Add info about resolution being processed
    info_text = f"Processing at: {state['processed_w']}×{state['processed_h']} ({gh}×{gw} patches)"

    return overlay, state, info_text


def reset():
    """Reset the interface"""
    return None, None, ""


with gr.Blocks(
    theme=gr.themes.Citrus(),
    css="""
    .container {max-width: 1200px; margin: auto;}
    .header {text-align: center; padding: 20px;}
    .info-box {
        background: rgba(0,0,0,0.03); 
        border-radius: 8px; 
        padding: 12px; 
        margin: 10px 0;
        border-left: 4px solid #2563eb;
    }
    """,
) as demo:
    gr.HTML(
        """
    <div class="header">
        <h1>🛰️ DINOv3 Satellite Vision: Interactive Patch Similarity</h1>
        <p style="font-size: 1.1em; color: #666;">
            Click any region to visualize feature similarities across the image
        </p>
    </div>
    """
    )

    with gr.Row():
        with gr.Column(scale=1):
            model_choice = gr.Dropdown(
                choices=list(MODEL_MAP.keys()),
                value=DEFAULT_NAME,
                label="Model Selection",
                info="Select a model (size/pretraining dataset)",
            )
            status = gr.Textbox(
                label="Model Status",
                value=f"Loaded: {DEFAULT_NAME}",
                interactive=False,
                lines=1,
            )
            resolution_info = gr.Textbox(
                label="Processing Resolution",
                value="",
                interactive=False,
                lines=1,
            )
            opacity = gr.Slider(
                0.0,
                1.0,
                0.55,
                step=0.05,
                label="Heatmap Opacity",
                info="Balance between image and similarity map",
            )

            with gr.Row():
                reset_btn = gr.Button("Reset", variant="secondary", scale=1)
                clear_btn = gr.ClearButton(value="Clear All", scale=1)

        with gr.Column(scale=2):
            img = gr.Image(
                type="pil",
                label="Interactive Canvas (Click to explore)",
                interactive=True,
                height=600,
                show_download_button=True,
                show_share_button=False,
            )

    state = gr.State()

    model_choice.change(
        load_model, inputs=model_choice, outputs=status, show_progress="full"
    )

    img.upload(prepare, inputs=img, outputs=state)

    img.select(
        click,
        inputs=[state, opacity, img],
        outputs=[img, state, resolution_info],
        show_progress="minimal",
    )

    reset_btn.click(reset, outputs=[img, state, resolution_info])
    clear_btn.add([img, state, resolution_info])

    # Examples from current directory
    example_files = [
        f.name
        for f in Path.cwd().iterdir()
        if f.suffix.lower() in [".jpg", ".jpeg", ".png", ".webp"]
    ]

    if example_files:
        gr.Examples(
            examples=[[f] for f in example_files],
            inputs=img,
            fn=prepare,
            outputs=[state],
            label="Example Images",
            examples_per_page=4,
            cache_examples=False,
        )

    gr.Markdown(
        f"""
    ---
    <div style="text-align: center; color: #666; font-size: 0.9em;">
        <b>Dynamic Resolution:</b> Images are processed at up to {MAX_IMAGE_DIM}px (longer side) while preserving aspect ratio.
        DINOv3's 3D RoPE embeddings handle variable sizes. 
        <br><br>
        <b>Performance Notes:</b> Satellite models are intended for: geographic patterns, land use classification, 
        and structural analysis. The 7B model provides exceptional detail at the codt of high memory usage.
        <br><br>
    </div>
    """
    )

if __name__ == "__main__":
    demo.launch(share=False, debug=True)