import gradio as gr
import huggingface_hub
import onnxruntime as rt
import numpy as np
import cv2


def get_mask(img, s=1024):
    img = (img / 255).astype(np.float32)
    h, w = h0, w0 = img.shape[:-1]
    h, w = (s, int(s * w / h)) if h > w else (int(s * h / w), s)
    ph, pw = s - h, s - w
    img_input = np.zeros([s, s, 3], dtype=np.float32)
    img_input[ph // 2:ph // 2 + h, pw // 2:pw // 2 + w] = cv2.resize(img, (w, h))
    img_input = np.transpose(img_input, (2, 0, 1))
    img_input = img_input[np.newaxis, :]
    mask = rmbg_model.run(None, {'img': img_input})[0][0]
    mask = np.transpose(mask, (1, 2, 0))
    mask = mask[ph // 2:ph // 2 + h, pw // 2:pw // 2 + w]
    mask = cv2.resize(mask, (w0, h0))[:, :, np.newaxis]
    return mask


def rmbg_fn(img):
    mask = get_mask(img)
    img = (mask * img + 255 * (1 - mask)).astype(np.uint8)
    mask = (mask * 255).astype(np.uint8)
    img = np.concatenate([img, mask], axis=2, dtype=np.uint8)
    mask = mask.repeat(3, axis=2)
    return mask, img


if __name__ == "__main__":
    providers = ['CUDAExecutionProvider', 'CPUExecutionProvider']
    model_path = huggingface_hub.hf_hub_download("skytnt/anime-seg", "isnetis.onnx")
    rmbg_model = rt.InferenceSession(model_path, providers=providers)
    app = gr.Blocks()
    with app:
        gr.Markdown("# Anime Remove Background\n\n"
                    "fork from [skytnt/anime-remove-background](https://huggingface.co/spaces/skytnt/anime-remove-background)\n"
                    "demo for [https://github.com/SkyTNT/anime-segmentation/](https://github.com/SkyTNT/anime-segmentation/)")
        with gr.Row():
            with gr.Column():
                input_img = gr.Image(label="input image")
                run_btn = gr.Button(variant="primary")
            output_mask = gr.Image(label="mask")
            output_img = gr.Image(label="result", image_mode="RGBA")
        run_btn.click(rmbg_fn, [input_img], [output_mask, output_img])
    app.launch()