import sys
sys.path.append('./')


import os 
import gc
import cv2
import torch
import random
import tempfile
import numpy as np
from PIL import Image
from diffusers import ControlNetModel, StableDiffusionXLControlNetPipeline

#import spaces
import gradio as gr
from huggingface_hub import hf_hub_download

from ip_adapter import IPAdapterXL

#import os
#os.system("git lfs install")
#os.system("git clone https://huggingface.co/h94/IP-Adapter")
#os.system("mv IP-Adapter/sdxl_models sdxl_models")

# global variable
MAX_SEED = np.iinfo(np.int32).max
if torch.cuda.is_available():
    device = torch.device("cuda")
elif torch.backends.mps.is_available():
    device = torch.device("mps")
else:
    device = torch.device("cpu")
#device = "cuda" if torch.cuda.is_available() else "cpu"
dtype = torch.float16 if str(device).__contains__("cuda") or str(device).__contains__("mps") else torch.float32

# initialization
base_model_path = "stabilityai/stable-diffusion-xl-base-1.0"
image_encoder_path = "sdxl_models/image_encoder"
ip_ckpt = "sdxl_models/ip-adapter_sdxl.bin"

controlnet_path = "diffusers/controlnet-canny-sdxl-1.0"
controlnet = ControlNetModel.from_pretrained(controlnet_path, use_safetensors=False, torch_dtype=dtype).to(device)

# load SDXL pipeline
pipe = StableDiffusionXLControlNetPipeline.from_pretrained(
    base_model_path,
    controlnet=controlnet,
    torch_dtype=dtype,
    add_watermarker=False,
)

# load ip-adapter
# target_blocks=["block"] for original IP-Adapter
# target_blocks=["up_blocks.0.attentions.1"] for style blocks only
# target_blocks = ["up_blocks.0.attentions.1", "down_blocks.2.attentions.1"] # for style+layout blocks
ip_model = IPAdapterXL(pipe, image_encoder_path, ip_ckpt, device, target_blocks=["up_blocks.0.attentions.1"])

def randomize_seed_fn(seed: int, randomize_seed: bool) -> int:
    if randomize_seed:
        seed = random.randint(0, MAX_SEED)
    return seed

def resize_img(
    input_image,
    max_side=1280,
    min_side=1024,
    size=None,
    pad_to_max_side=False,
    mode=Image.BILINEAR,
    base_pixel_number=64,
):
    w, h = input_image.size
    if size is not None:
        w_resize_new, h_resize_new = size
    else:
        ratio = min_side / min(h, w)
        w, h = round(ratio * w), round(ratio * h)
        ratio = max_side / max(h, w)
        input_image = input_image.resize([round(ratio * w), round(ratio * h)], mode)
        w_resize_new = (round(ratio * w) // base_pixel_number) * base_pixel_number
        h_resize_new = (round(ratio * h) // base_pixel_number) * base_pixel_number
    input_image = input_image.resize([w_resize_new, h_resize_new], mode)

    if pad_to_max_side:
        res = np.ones([max_side, max_side, 3], dtype=np.uint8) * 255
        offset_x = (max_side - w_resize_new) // 2
        offset_y = (max_side - h_resize_new) // 2
        res[
            offset_y : offset_y + h_resize_new, offset_x : offset_x + w_resize_new
        ] = np.array(input_image)
        input_image = Image.fromarray(res)
    return input_image

def get_example():
    case = [
        [
            "./assets/0.jpg",
            None,
            "a cat, masterpiece, best quality, high quality",
            1.0,
            0.0
        ],
        [
            "./assets/1.jpg",
            None,
            "a cat, masterpiece, best quality, high quality",
            1.0,
            0.0
        ],
        [
            "./assets/2.jpg",
            None,
            "a cat, masterpiece, best quality, high quality",
            1.0,
            0.0
        ],
        [
            "./assets/3.jpg",
            None,
            "a cat, masterpiece, best quality, high quality",
            1.0,
            0.0
        ],
        [
            "./assets/2.jpg",
            "./assets/yann-lecun.jpg",
            "a man, masterpiece, best quality, high quality",
            1.0,
            0.6
        ],
    ]
    return case

def run_for_examples(style_image, source_image, prompt, scale, control_scale):

    return create_image(
        image_pil=style_image,
        input_image=source_image,
        prompt=prompt,
        n_prompt="text, watermark, lowres, low quality, worst quality, deformed, glitch, low contrast, noisy, saturation, blurry",
        scale=scale,
        control_scale=control_scale,
        guidance_scale=5,
        num_samples=1,
        num_inference_steps=20,
        seed=42,
        target="Load only style blocks",
        neg_content_prompt="",
        neg_content_scale=0,
    )

#@spaces.GPU(enable_queue=True)
def create_image(image_pil,
                 input_image,
                 prompt,
                 n_prompt,
                 scale, 
                 control_scale, 
                 guidance_scale,
                 num_samples,
                 num_inference_steps,
                 seed,
                 target="Load only style blocks",
                 neg_content_prompt=None,
                 neg_content_scale=0,
#                 progress=gr.Progress(track_tqdm=True)
                ):

    if target =="Load original IP-Adapter":
        # target_blocks=["blocks"] for original IP-Adapter
        ip_model = IPAdapterXL(pipe, image_encoder_path, ip_ckpt, device, target_blocks=["blocks"])
    elif target=="Load only style blocks":
        # target_blocks=["up_blocks.0.attentions.1"] for style blocks only
        ip_model = IPAdapterXL(pipe, image_encoder_path, ip_ckpt, device, target_blocks=["up_blocks.0.attentions.1"])
    elif target == "Load style+layout block":
        # target_blocks = ["up_blocks.0.attentions.1", "down_blocks.2.attentions.1"] # for style+layout blocks
        ip_model = IPAdapterXL(pipe, image_encoder_path, ip_ckpt, device, target_blocks=["up_blocks.0.attentions.1", "down_blocks.2.attentions.1"])
    
    if input_image is not None:
        input_image = resize_img(input_image, max_side=1024)
        cv_input_image = pil_to_cv2(input_image)
        detected_map = cv2.Canny(cv_input_image, 50, 200)
        canny_map = Image.fromarray(cv2.cvtColor(detected_map, cv2.COLOR_BGR2RGB))
    else:
        canny_map = Image.new('RGB', (1024, 1024), color=(255, 255, 255))
        control_scale = 0

    if float(control_scale) == 0:
        canny_map = canny_map.resize((1024,1024))
    
    if len(neg_content_prompt) > 0 and neg_content_scale != 0:
        images = ip_model.generate(pil_image=image_pil,
                                prompt=prompt,
                                negative_prompt=n_prompt,
                                scale=scale,
                                guidance_scale=guidance_scale,
                                num_samples=num_samples,
                                num_inference_steps=num_inference_steps, 
                                seed=seed,
                                image=canny_map,
                                controlnet_conditioning_scale=float(control_scale),
                                neg_content_prompt=neg_content_prompt,
                                neg_content_scale=neg_content_scale
                                )
    else:
        images = ip_model.generate(pil_image=image_pil,
                                prompt=prompt,
                                negative_prompt=n_prompt,
                                scale=scale,
                                guidance_scale=guidance_scale,
                                num_samples=num_samples,
                                num_inference_steps=num_inference_steps, 
                                seed=seed,
                                image=canny_map,
                                controlnet_conditioning_scale=float(control_scale),
                                )
    
    gradio_temp_dir = os.environ.get('GRADIO_TEMP_DIR', tempfile.gettempdir())
    temp_file_path = os.path.join(gradio_temp_dir, "image.png")
    images[0].save(temp_file_path, format="PNG")
    print(f"Image saved in: {temp_file_path}")

    return images, temp_file_path

def pil_to_cv2(image_pil):
    image_np = np.array(image_pil)
    image_cv2 = cv2.cvtColor(image_np, cv2.COLOR_RGB2BGR)
    return image_cv2

def clear_cache(device="cuda"):
    gc.collect()
    if device == 'mps':
        torch.mps.empty_cache()
    elif device == 'cuda':
        torch.cuda.empty_cache()
    print(f"{device} cache cleared!")

# Description
title = r"""
<h1 align="center">InstantStyle: Free Lunch towards Style-Preserving in Text-to-Image Generation</h1>
"""

description = r"""
<b>Official 🤗 Gradio demo</b> for <a href='https://github.com/InstantStyle/InstantStyle' target='_blank'><b>InstantStyle: Free Lunch towards Style-Preserving in Text-to-Image Generation</b></a>.<br>

How to use:<br>
1. Upload a style image.
2. Set stylization mode, only use style block by default.
2. Enter a text prompt, as done in normal text-to-image models.
3. Click the <b>Submit</b> button to begin customization.
4. Share your stylized photo with your friends and enjoy! 😊


Advanced usage:<br>
1. Click advanced options.
2. Upload another source image for image-based stylization using ControlNet.
3. Enter negative content prompt to avoid content leakage.
"""

article = r"""
---
📝 **Citation**
<br>
If our work is helpful for your research or applications, please cite us via:
```bibtex
@article{wang2024instantstyle,
  title={InstantStyle: Free Lunch towards Style-Preserving in Text-to-Image Generation},
  author={Wang, Haofan and Wang, Qixun and Bai, Xu and Qin, Zekui and Chen, Anthony},
  journal={arXiv preprint arXiv:2404.02733},
  year={2024}
}
```
📧 **Contact**
<br>
If you have any questions, please feel free to open an issue or directly reach us out at <b>haofanwang.ai@gmail.com</b>.
"""

css = """
footer { visibility: hidden }
#row-height { height: 65px !important }
"""

block = gr.Blocks(css=css).queue(max_size=10, api_open=False)
with block:
    
    # description
    gr.Markdown(title)
    #gr.Markdown(description)
    
    with gr.Row(equal_height=True):
        with gr.Column():
            
            with gr.Row():
                with gr.Column():
                    image_pil = gr.Image(label="Style Image", type='pil')
            
            target = gr.Radio(["Load only style blocks", "Load style+layout block", "Load original IP-Adapter"], 
                                value="Load only style blocks",
                                label="Style mode")
            
            prompt = gr.Textbox(label="Prompt",
                                value="a cat, masterpiece, best quality, high quality")
            
            scale = gr.Slider(minimum=0,maximum=2.0, step=0.01,value=1.0, label="Scale")
            
            with gr.Accordion(open=False, label="Advanced Options"):
                
                with gr.Column():
                    src_image_pil = gr.Image(label="Source Image (optional)", type='pil')
                control_scale = gr.Slider(minimum=0,maximum=1.0, step=0.01,value=0.5, label="Controlnet conditioning scale")
                
                n_prompt = gr.Textbox(label="Neg Prompt", value="text, watermark, lowres, low quality, worst quality, deformed, glitch, low contrast, noisy, saturation, blurry")
                
                neg_content_prompt = gr.Textbox(label="Neg Content Prompt", value="")
                neg_content_scale = gr.Slider(minimum=0, maximum=1.0, step=0.01,value=0.5, label="Neg Content Scale")

                guidance_scale = gr.Slider(minimum=1,maximum=15.0, step=0.01,value=5.0, label="guidance scale")
                num_samples= gr.Slider(minimum=1,maximum=4.0, step=1.0,value=1.0, label="num samples")
                num_inference_steps = gr.Slider(minimum=5,maximum=50.0, step=1.0,value=20, label="num inference steps")
                seed = gr.Slider(minimum=-1000000,maximum=1000000,value=1, step=1, label="Seed Value")
                randomize_seed = gr.Checkbox(label="Randomize seed", value=True)
                
            #generate_button = gr.Button("Generate Image")
            
        with gr.Column():
            generated_image = gr.Gallery(label="Generated Image", scale=0.3)
            download_image = gr.File(label="Download Image", elem_id="row-height", scale=0)
            generate_button = gr.Button("Generate Image", min_width=2000, scale=0)
            gr.Markdown(description)

        generate_button.click(
            fn=randomize_seed_fn,
            inputs=[seed, randomize_seed],
            outputs=seed,
            queue=False,
            api_name=False,
        ).then(
            fn=create_image,
            inputs=[image_pil,
                    src_image_pil,
                    prompt,
                    n_prompt,
                    scale, 
                    control_scale, 
                    guidance_scale,
                    num_samples,
                    num_inference_steps,
                    seed,
                    target,
                    neg_content_prompt,
                    neg_content_scale], 
            outputs=[generated_image, download_image]
        ).then(
            fn=clear_cache,
            inputs=[],
            outputs=None
        )
    
    gr.Examples(
        examples=get_example(),
        inputs=[image_pil, src_image_pil, prompt, scale, control_scale],
        fn=run_for_examples,
        outputs=[generated_image],
        #cache_examples=True,
    )
    
    gr.Markdown(article)

block.launch()