import gradio as gr
import spaces
import torch
from diffusers import AutoencoderKL, TCDScheduler
from diffusers.models.model_loading_utils import load_state_dict
from gradio_imageslider import ImageSlider
from huggingface_hub import hf_hub_download

from controlnet_union import ControlNetModel_Union
from pipeline_fill_sd_xl import StableDiffusionXLFillPipeline

from PIL import Image, ImageDraw
import numpy as np

config_file = hf_hub_download(
    "xinsir/controlnet-union-sdxl-1.0",
    filename="config_promax.json",
)

config = ControlNetModel_Union.load_config(config_file)
controlnet_model = ControlNetModel_Union.from_config(config)
model_file = hf_hub_download(
    "xinsir/controlnet-union-sdxl-1.0",
    filename="diffusion_pytorch_model_promax.safetensors",
)
state_dict = load_state_dict(model_file)
model, _, _, _, _ = ControlNetModel_Union._load_pretrained_model(
    controlnet_model, state_dict, model_file, "xinsir/controlnet-union-sdxl-1.0"
)
model.to(device="cuda", dtype=torch.float16)

vae = AutoencoderKL.from_pretrained(
    "madebbyollin/sdxl-vae-fp16-fix", torch_dtype=torch.float16
).to("cuda")

pipe = StableDiffusionXLFillPipeline.from_pretrained(
    "SG161222/RealVisXL_V5.0_Lightning",
    torch_dtype=torch.float16,
    vae=vae,
    controlnet=model,
    variant="fp16",
).to("cuda")

pipe.scheduler = TCDScheduler.from_config(pipe.scheduler.config)

def can_expand(source_width, source_height, target_width, target_height, alignment):
    """Checks if the image can be expanded based on the alignment."""
    if alignment in ("Left", "Right") and source_width>=target_width:
        return False
    if alignment in ("Top","Bottom") and source_height>=target_height:
        return False
    return True

def prepare_image_and_mask(image, width, height, overlap_percentage, resize_option, custom_resize_percentage, alignment, overlap_left, overlap_right, overlap_top, overlap_bottom):
    target_size = (width, height)

    #Calculate the scaling factor to fit the image within the target size
    scale_factor = min(target_size[0]/image.width, target_size[1]/image.height)
    new_width = int(image.width * scale_factor)
    new_height = int(image.height * scale_factor)

    #Resize the source image to fit within target size
    source = image.resize((new_width, new_height), Image.LANCZOS)

    #Apply resize option using percentages
    if resize_option == "Full":
        resize_percentage = 100
    elif resize_option == "50%":
        resize_percentage = 50
    elif resize_option == "33%":
        resize_percentage = 33
    elif resize_option == "25%":
        resize_option = 25
    else:
        resize_percentage = custom_resize_percentage

    #calculate new dimensions based on percentage
    resize_factor = resize_percentage/100
    new_width = int(source.width * resize_factor)
    new_height = int(source.height * resize_factor)

    #Ensure minimum size of 64 pixels
    new_width = max(new_width, 64)
    new_height = max(new_height, 64)

    #Resize the image
    source = source.resize((new_width, new_height), Image.LANCZOS)

    #Calculate the overlap in pixels based on the percentage
    overlap_x = int(new_width * (overlap_percentage/100))
    overlap_y = int(new_height * (overlap_percentage/100))

    #Ensure minimum overlap of 1 pixel
    overlap_x = max(overlap_x, 1)
    overlap_y = max(overlap_y, 1)

    #Calculate margins based on alignment
    if alignment == "Middle":
        margin_x = (target_size[0]-new_width)//2
        margin_y = (target_size[1]-new_height)//2
    elif alignment == "Left":
        margin_x = 0
        margin_y = (target_size[1]-new_height)//2
    elif alignment == "Right":
        margin_x = target_size[0] - new_width
        margin_y = (target_size[1]-new_height)//2
    elif alignment == "Top":
        margin_x = (target_size[0]-new_width)//2
        margin_y = 0
    elif alignment == "Bottom":
        margin_x = (target_size[0]-new_width)//2
        margin_y = target_size[1] - new_height

    #adjust margins to eliminate gaps
    margin_x = max(0, min(margin_x, target_size[0]-new_width))
    margin_y = max(0, min(margin_y, target_size[1]-new_height))

    #Create a new background image and paste the resized source image
    background = Image.new('RGB', target_size, (255,255,255))
    background.paste(source, (margin_x, margin_y))

    #Create the mask
    mask = Image.new('L', target_size, 255)
    mask_draw = ImageDraw.Draw(mask)

    #Calculate overlap areas
    white_gaps_patch = 2

    left_overlap = margin_x + overlap_x if overlap_left else margin_x+white_gaps_patch
    right_overlap = margin_x + new_width-overlap_x if overlap_right else margin_x+new_width-white_gaps_patch
    top_overlap = margin_y + overlap_y if overlap_top else margin_y + white_gaps_patch
    bottom_overlap = margin_y + new_height - overlap_y if overlap_bottom else margin_y+new_height-white_gaps_patch

    if alignment == "Left":
        left_overlap = margin_x + overlap_x if overlap_left else margin_x
    elif alignment == "Right":
        right_overlap = margin_x + new_width - overlap_x if overlap_right else margin_x + new_width
    elif alignment == "Top":
        top_overlap = margin_y + overlap_y if overlap_top else margin_y
    elif alignment == "Bottom":
        bottom_overlap = margin_y + new_height - overlap_y if overlap_bottom else margin_y + new_height

    #Draw the mask
    mask_draw.rectangle([
        (left_overlap, top_overlap),
        (right_overlap, bottom_overlap)
    ], fill=0)

    return background, mask

def preview_image_and_mask(image, width, height, overlap_percentage, resize_option, custom_resize_percentage, alignment, overlap_left, overlap_right, overlap_top, overlap_bottom):
    background, mask = prepare_image_and_mask(image, width, height, overlap_percentage, resize_option, custom_resize_percentage, alignment, overlap_left, overlap_right, overlap_top, overlap_bottom)

    #Create a preview image showing the mask
    preview = background.copy().convert('RGBA')

    #Create a semi-transparent red overlay
    red_overlay = Image.new('RGBA', background.size, (255, 0, 0, 64)) #Reduced alpha to 64(25% opacity)

    #Convert black pixels in the mask to semi-transparent red
    red_mask = Image.new('RGBA', background.size, (0,0,0,0))
    red_mask.paste(red_overlay, (0,0), mask)

    #Overlay the red mask on the background
    preview = Image.alpha_composite(preview, red_mask)

    return preview

@spaces.GPU(duration=24)
def infer(image, width, height, overlap_percentage, num_inference_steps, resize_option, custom_resize_percentage, prompt_input, alignment, overlap_left, overlap_right, overlap_top, overlap_bottom):
    background, mask = prepare_image_and_mask(image, width, height, overlap_percentage, resize_option, custom_resize_percentage, alignment, overlap_left, overlap_right, overlap_top, overlap_bottom)

    if not can_expand(background.width, background.height, width, height, alignment):
        alignment = "Middle"

    cnet_image = background.copy()
    cnet_image.paste(0, (0,0), mask)

    final_prompt = f"{prompt_input}, high quality, 4k"

    (
        prompt_embeds,
        negative_prompt_embeds,
        pooled_prompt_embeds,
        negative_pooled_prompt_embeds,
    ) = pipe.encode_prompt(final_prompt, "cuda", True)

    for image in pipe(
        prompt_embeds = prompt_embeds,
        negative_prompt_embeds = negative_prompt_embeds,
        pooled_prompt_embeds = pooled_prompt_embeds,
        negative_pooled_prompt_embeds = negative_pooled_prompt_embeds,
        image = cnet_image,
        num_inference_steps=num_inference_steps
    ):
        yield cnet_image, image

    image = image.convert('RGBA')
    cnet_image.paste(image, (0,0), mask)

    yield background, cnet_image

def clear_result():
    """Clears the result ImageSlider."""
    return gr.update(value=None)

def preload_presets(target_ratio, ui_width, ui_height):
    """Updates the width and height sliders based on the selected aspect ratio."""
    if target_ratio == "9:16":
        changed_width = 720
        changed_height = 1280
        return changed_width, changed_height, gr.update()
    elif target_ratio == "16:9":
        changed_width = 1280
        changed_height = 720
        return changed_width, changed_height, gr.update()
    elif target_ratio == "1:1":
        changed_width = 1024
        changed_height = 1024
        return ui_width, ui_height, gr.update(open=True)

def select_the_right_preset(user_width, user_height):
    if user_width == 720 and user_height == 1280:
        return "9:16"
    elif user_width == 1280 and user_height == 720:
        return "16:9"
    elif user_width == 1024 and user_height == 1024:
        return "1:1"
    else:
        return "Custom"

def toggle_custom_resize_slider(resize_option):
    return gr.update(visible=(resize_option=="Custom"))

def update_history(new_image, history):
    """Updates the history gallery with the new image."""
    if history is None:
        history = []
    history.insert(0, new_image)
    return history


with gr.Blocks() as demo:
    with gr.Column():
        with gr.Row():
            with gr.Column():
                input_image = gr.Image(
                    type="pil",
                    label="Input Image"
                )

                with gr.Row():
                    with gr.Column(scale=2):
                        prompt_input = gr.Textbox(label="Prompt (Optional)")
                    with gr.Column(scale=1):
                        run_button = gr.Button('Generate')

                with gr.Row():
                    target_ratio = gr.Ratio(
                        label="Expected Ratio",
                        choices=["9:16", "16:9", "1:1", "Custom"],
                        value="9:16",
                        scale=2
                    )

                    alignment_dropdown = gr.Dropdown(
                        choices=['Middle','Left','Right','Top','Bottom'],
                        value='Middle',
                        label='Alignment'
                    )
                #高级配置，当选择custom的时候会自动打开
                with gr.Accordion(label="Advanced settings", open=False) as settings_panel:
                    with gr.Column():
                        #自定义的宽高
                        with gr.Row():
                            width_slider = gr.Slider(
                                label="Target Width",
                                minimum=720,
                                maximum=1536,
                                step=8,
                                value=720, #Set a default value
                            )
                            height_slider = gr.Slider(
                                label="Target Height",
                                minimum=720,
                                maximum=1536,
                                step=8,
                                value=1280, #Set a default value
                            )
                        #生成步数
                        num_inference_steps = gr.Slider(label="Steps", minimum=4, maximum=12, step=1, value=8)
                        #组件组
                        with gr.Group():
                            overlap_percentage = gr.Slider(
                                label="Mask overlap (%)",
                                minimum=1,
                                maximum=50,
                                value=10,
                                step=1
                            )
                            with gr.Row():
                                overlap_top = gr.Checkbox(label="Overlap Top", value=True)
                                overlap_right = gr.Checkbox(label="Overlap Right", value=True)
                            with gr.Row():
                                overlap_left = gr.Checkbox(label="Overlap Left", value=True)
                                overlap_bottom = gr.Checkbox(label="Overlap Bottom", value=True)
                        with gr.Row():
                            resize_option = gr.Radio(
                                label = "Resize input image",
                                choices = ["Full", "50%", "33%", "25%", "Custom"],
                                value="Full"
                            )
                            custom_resize_percentage = gr.Slider(
                                label="Custom resize (%)",
                                minimum = 1,
                                maximum = 100,
                                step = 1,
                                value = 50,
                                visible = False
                            )

                        with gr.Column():
                            preview_button = gr.Button("Preview alignment and mask")

            with gr.Column():
                result = gr.Image(label="Generate Image", interactive=False)
                history_gallery = gr.Gallery(label="History", columns=6, object_fit="contain", interactive=False)
                preview_image = gr.Image(label="Preview")

    target_ratio.change(
        fn=preload_presets, #选择ratio aspect 的单选框时，调用这个函数
        inputs=[target_ratio, width_slider, height_slider],
        outputs=[width_slider, height_slider, settings_panel],
        queue=False
    )

    width_slider.change(
        fn=select_the_right_preset,
        inputs=[width_slider, height_slider],
        outputs=[target_ratio],
        queue=False
    )

    height_slider.change(
        fn=select_the_right_preset,
        inputs=[width_slider, height_slider],
        outputs=[target_ratio],
        queue=False
    )

    resize_option.change(
        fn=toggle_custom_resize_slider,
        inputs=[resize_option],
        outputs=[custom_resize_percentage],
        queue=False
    )

    run_button.click(#Clear the result
        fn=clear_result,
        inputs=None,
        outputs=result,
    ).then( #Generate the new image
        fn=infer,
        inputs=[input_image, width_slider, height_slider, overlap_percentage, num_inference_steps,
               resize_option, custom_resize_percentage, prompt_input, alignment_dropdown,
               overlap_left, overlap_right, overlap_top, overlap_bottom],
        outputs=result,
    ).then(#update the history gallery
        fn=lambda x, history: update_history(x[1], history),
        inputs=[result, history_gallery],
        outputs=history_gallery,
    )

    preview_button.click(
        fn=preview_image_and_mask,
        inputs=[input_image, width_slider, height_slider, overlap_percentage, resize_option, custom_resize_percentage, alignment_dropdown,
               overlap_left, overlap_right, overlap_top, overlap_bottom],
        outputs=preview_image,
        queue=False
    )
    
demo.queue(max_size=12).launch(share=False)