import logging

import gradio as gr
from rembg import new_session

from cutter import remove, make_label
from utils import *

remove_bg_models = {
    "U2NET": "u2net",
    "U2NET Human Seg": "u2net_human_seg",
    "U2NET Cloth Seg": "u2net_cloth_seg"
}

model_choices = keys(remove_bg_models)


def predict(image, session, smoot, matting, bg_color):

    session = new_session(remove_bg_models[session])

    try:
        return remove(session, image, smoot, matting, bg_color)
    except ValueError as err:
        logging.error(err)
        return make_label(str(err)), None


def change_show_mask(chk_state):
    return gr.Image(visible=chk_state)


def change_include_matting(chk_state):
    return gr.Group(visible=chk_state), (0, 0, 0), 0, 0, 0


def change_foreground_threshold(fg_value, value):
    fg, bg, erode = value
    return fg_value, bg, erode


def change_background_threshold(bg_value, value):
    fg, bg, erode = value
    return fg, bg_value, erode


def change_erode_size(erode_value, value):
    fg, bg, erode = value
    return fg, bg, erode_value


def set_dominant_color(chk_state):
    return chk_state, gr.ColorPicker(visible=not chk_state)


def change_picker_color(picker, dominant):
    if not dominant:
        return picker
    return dominant


def change_background_mode(chk_state):
    return gr.ColorPicker(visible=chk_state), \
        gr.Checkbox(value=False, visible=chk_state)


footer = r"""
<center>
<b>
Demo based on <a href='https://github.com/danielgatis/rembg'>Rembg</a>
</b>
</center>
"""

with gr.Blocks(title="Remove background") as app:
    color_state = gr.State(value=False)
    matting_state = gr.State(value=(0, 0, 0))

    gr.HTML("<center><h1>Remove Background Tool</h1></center>")
    with gr.Row(equal_height=False):
        with gr.Column():
            input_img = gr.Image(type="pil", label="Input image")
            drp_models = gr.Dropdown(choices=model_choices, label="Model Segment", value="U2NET")
            with gr.Row():
                chk_include_matting = gr.Checkbox(label="Matting", value=False)
                chk_smoot_mask = gr.Checkbox(label="Smoot Mask", value=False)
                chk_show_mask = gr.Checkbox(label="Show Mask", value=False)
            with gr.Group(visible=False) as slider_matting:
                slr_fg_threshold = gr.Slider(0, 300, value=270, step=1, label="Alpha matting foreground threshold")
                slr_bg_threshold = gr.Slider(0, 50, value=20, step=1, label="Alpha matting background threshold")
                slr_erode_size = gr.Slider(0, 20, value=11, step=1, label="Alpha matting erode size")
            with gr.Group():
                with gr.Row():
                    chk_change_color = gr.Checkbox(label="Change background color", value=False)
                    pkr_color = gr.ColorPicker(label="Pick a new color", visible=False)
                    chk_dominant = gr.Checkbox(label="Use dominant color", value=False, visible=False)
            run_btn = gr.Button(value="Remove background", variant="primary")
        with gr.Column():
            output_img = gr.Image(type="pil", label="Image Result")
            mask_img = gr.Image(type="pil", label="Image Mask", visible=False)
            gr.ClearButton(components=[input_img, output_img, mask_img])

    chk_include_matting.change(change_include_matting, inputs=[chk_include_matting],
                               outputs=[slider_matting, matting_state,
                                        slr_fg_threshold, slr_bg_threshold, slr_erode_size])

    slr_fg_threshold.change(change_foreground_threshold, inputs=[slr_fg_threshold, matting_state],
                            outputs=[matting_state])

    slr_bg_threshold.change(change_background_threshold, inputs=[slr_bg_threshold, matting_state],
                            outputs=[matting_state])

    slr_erode_size.change(change_erode_size, inputs=[slr_erode_size, matting_state],
                          outputs=[matting_state])

    chk_show_mask.change(change_show_mask, inputs=[chk_show_mask], outputs=[mask_img])

    chk_change_color.change(change_background_mode, inputs=[chk_change_color],
                            outputs=[pkr_color, chk_dominant])

    pkr_color.change(change_picker_color, inputs=[pkr_color, chk_dominant], outputs=[color_state])

    chk_dominant.change(set_dominant_color, inputs=[chk_dominant], outputs=[color_state, pkr_color])

    run_btn.click(predict, inputs=[input_img, drp_models, chk_smoot_mask, matting_state, color_state],
                  outputs=[output_img, mask_img])

    with gr.Row():
        gr.HTML(footer)

app.queue()
app.launch(share=False, debug=True, show_error=True)