import os

import gradio as gr
from imgutils.detect import detect_person, detect_halfbody, detect_heads, detection_visualize


def _split_image(image, head_scale: float):
    retval = []
    all_detects = []
    for i, (px, _, score) in enumerate(detect_person(image), start=1):
        person_image = image.crop(px)
        person_label = f'Person #{i} ({score * 100.0:.1f}%)'
        retval.append((person_image, person_label))
        all_detects.append((px, 'person', score))
        px0, py0, _, _ = px

        half_detects = detect_halfbody(person_image)
        if half_detects:
            halfbody_image = person_image.crop(half_detects[0][0])
            halfbody_label = f'Person #{i} - Half Body'
            retval.append((halfbody_image, halfbody_label))
            bx0, by0, bx1, by1 = half_detects[0][0]
            all_detects.append(((bx0 + px0, by0 + py0, bx1 + px0, by1 + py0), 'halfbody', half_detects[0][2]))

        head_detects = detect_heads(person_image)
        if head_detects:
            (hx0, hy0, hx1, hy1), _, head_score = head_detects[0]
            cx, cy = (hx0 + hx1) / 2, (hy0 + hy1) / 2
            width, height = hx1 - hx0, hy1 - hy0
            width = height = max(width, height) * head_scale
            x0, y0 = int(max(cx - width / 2, 0)), int(max(cy - height / 2, 0))
            x1, y1 = int(min(cx + width / 2, person_image.width)), int(min(cy + height / 2, person_image.height))
            head_image = person_image.crop((x0, y0, x1, y1))
            head_label = f'Person #{i} - Head'
            retval.append((head_image, head_label))
            all_detects.append(((x0 + px0, y0 + py0, x1 + px0, y1 + py0), 'head', head_score))

    return detection_visualize(image, all_detects), retval


if __name__ == '__main__':
    with gr.Blocks() as demo:
        with gr.Row():
            with gr.Column():
                gr_input = gr.Image(type='pil', label='Original Image')
                gr_head_scale = gr.Slider(0.8, 2.5, 1.5, label='Head Scale')
                gr_button = gr.Button(value='Crop', variant='primary')

            with gr.Column():
                with gr.Tabs():
                    with gr.Tab('Detected'):
                        gr_detected = gr.Image(type='pil', label='Detection')
                    with gr.Tab('Cropped'):
                        gr_gallery = gr.Gallery(label='Cropped Images')

            gr_button.click(
                _split_image,
                inputs=[gr_input, gr_head_scale],
                outputs=[gr_detected, gr_gallery],
            )

    demo.queue(os.cpu_count()).launch()