DEVICE = 'cuda'

import gradio as gr
import numpy as np
from sklearn.svm import SVC
from sklearn import preprocessing
import pandas as pd

from diffusers import LCMScheduler, AutoencoderTiny, EulerDiscreteScheduler, UNet2DConditionModel, AutoPipelineForText2Image, DiffusionPipeline
from diffusers.models import ImageProjection
import torch

torch.set_float32_matmul_precision('high')

import random
import time

import spaces
from urllib.request import urlopen

from PIL import Image
import requests
from io import BytesIO, StringIO

from transformers import CLIPVisionModelWithProjection
from huggingface_hub import hf_hub_download
from safetensors.torch import load_file

from safety_checker_improved import maybe_nsfw

prompt_list = [p for p in list(set(
                pd.read_csv('./twitter_prompts.csv').iloc[:, 1].tolist())) if type(p) == str]

start_time = time.time()

####################### Setup Model

model_id = "stabilityai/stable-diffusion-xl-base-1.0"
sdxl_lightening = "ByteDance/SDXL-Lightning"
ckpt = "sdxl_lightning_2step_unet.safetensors"
unet = UNet2DConditionModel.from_config(model_id, subfolder="unet", low_cpu_mem_usage=True, device_map=DEVICE).to(torch.float16)
unet.load_state_dict(load_file(hf_hub_download(sdxl_lightening, ckpt)))

image_encoder = CLIPVisionModelWithProjection.from_pretrained("h94/IP-Adapter",  subfolder="models/image_encoder", torch_dtype=torch.float16, low_cpu_mem_usage=True, device_map=DEVICE)
pipe = AutoPipelineForText2Image.from_pretrained(model_id, unet=unet, torch_dtype=torch.float16, variant="fp16", image_encoder=image_encoder, low_cpu_mem_usage=True)
pipe.unet._load_ip_adapter_weights(torch.load(hf_hub_download('h94/IP-Adapter', 'sdxl_models/ip-adapter_sdxl_vit-h.bin')))
pipe.load_ip_adapter("h94/IP-Adapter", subfolder="sdxl_models", weight_name="ip-adapter_sdxl_vit-h.bin")
pipe.register_modules(image_encoder = image_encoder)
pipe.set_ip_adapter_scale(0.8)

pipe.vae = AutoencoderTiny.from_pretrained("madebyollin/taesdxl", torch_dtype=torch.float16, low_cpu_mem_usage=True)
pipe.scheduler = EulerDiscreteScheduler.from_config(pipe.scheduler.config, timestep_spacing="trailing")

pipe.to(device=DEVICE)

@spaces.GPU
def compile_em():
    pipe.unet = torch.compile(pipe.unet, mode='reduce-overhead')
    pipe.vae = torch.compile(pipe.vae, mode='reduce-overhead')
    autoencoder.model.forward = torch.compile(autoencoder.model.forward, backend='inductor', dynamic=True)


output_hidden_state = False
#######################

####################### Setup autoencoder

from tqdm import tqdm
from transformers import AutoTokenizer, AutoModelForCausalLM

class BottleneckT5Autoencoder:
    def __init__(self, model_path: str, device='cuda'):
        self.device = device
        self.tokenizer = AutoTokenizer.from_pretrained(model_path, model_max_length=512, torch_dtype=torch.bfloat16)
        self.model = AutoModelForCausalLM.from_pretrained(model_path, trust_remote_code=True, low_cpu_mem_usage=True).to('cuda')
        self.model.eval()


    def embed(self, text: str) -> torch.FloatTensor:
        inputs = self.tokenizer(text, return_tensors='pt', padding=True).to(self.device)
        decoder_inputs = self.tokenizer('', return_tensors='pt').to(self.device)
        return self.model(
            **inputs,
            decoder_input_ids=decoder_inputs['input_ids'],
            encode_only=True,
        )

    def generate_from_latent(self, latent: torch.FloatTensor, max_length=20, temperature=1., top_p=.8, min_new_tokens=30) -> str:
        dummy_text = '.'
        dummy = self.embed(dummy_text)
        perturb_vector = latent - dummy
        self.model.perturb_vector = perturb_vector
        input_ids = self.tokenizer(dummy_text, return_tensors='pt').to(self.device).input_ids
        output = self.model.generate(
            input_ids=input_ids,
            max_length=max_length,
            do_sample=True,
            temperature=temperature,
            top_p=top_p,
            num_return_sequences=1,
            min_new_tokens=min_new_tokens,
            #num_beams=4,
        )
        return self.tokenizer.decode(output[0], skip_special_tokens=True)

autoencoder = BottleneckT5Autoencoder(model_path='thesephist/contra-bottleneck-t5-xl-wikipedia')

compile_em()
#######################

@spaces.GPU
def generate(prompt, in_embs=None,):
  if prompt != '':
    print(prompt)
    in_embs = in_embs / in_embs.abs().max() * .15 if in_embs != None else None
    in_embs = .9 * in_embs.to('cuda') + .5 * autoencoder.embed(prompt).to('cuda') if in_embs != None else autoencoder.embed(prompt).to('cuda')
  else:
    print('From embeds.')
  in_embs = in_embs / in_embs.abs().max() * .15
  text = autoencoder.generate_from_latent(in_embs.to('cuda').to(dtype=torch.bfloat16), temperature=.3, top_p=.99, min_new_tokens=5)
  in_embs = autoencoder.embed(text).to('cuda')
  return text, in_embs.to('cpu')


@spaces.GPU
def predict(
        prompt,
        im_emb=None,
        progress=gr.Progress(track_tqdm=True)
    ):
    """Run a single prediction on the model"""
    with torch.no_grad():
        if im_emb == None:
            im_emb = torch.zeros(1, 1024, dtype=torch.float16, device=DEVICE)
            
        im_emb = [im_emb.to(DEVICE).unsqueeze(0)]
        if prompt == '':
            image = pipe(
                prompt_embeds=torch.zeros(1, 1, 2048, dtype=torch.float16, device=DEVICE),
                pooled_prompt_embeds=torch.zeros(1, 1280, dtype=torch.float16, device=DEVICE),
                ip_adapter_image_embeds=im_emb,
                height=1024,
                width=1024,                                                                                                             
                num_inference_steps=2,
                guidance_scale=0,
#                timesteps=[800],
            ).images[0]
        else:
            image = pipe(
                prompt=prompt,
                ip_adapter_image_embeds=im_emb,
                height=1024,
                width=1024,                                                                                                             
                num_inference_steps=2,
                guidance_scale=0,
#                timesteps=[800],
            ).images[0]
        im_emb, _ = pipe.encode_image(
                image, DEVICE, 1, output_hidden_state
            )
        
        nsfw = maybe_nsfw(image)
        if nsfw:
            return None, im_emb.to('cpu')
        
        return image, im_emb.to('cpu')
        
        
# sample a .8 of rated embeddings for some stochasticity, or at least two embeddings.
def get_coeff(embs_local, ys):
    n_to_choose = max(int(len(embs_local)*.8), 2)
    indices = random.sample(range(len(embs_local)), n_to_choose)

    # we may have just encountered a rare multi-threading diffusers issue (https://github.com/huggingface/diffusers/issues/5749);
    # this ends up adding a rating but losing an embedding, it seems.
    # let's take off a rating if so to continue without indexing errors.
    if len(ys) > len(embs_local):
        print('ys are longer than embs; popping latest rating')
        ys.pop(-1)
    
    # also add the latest 0 and the latest 1
    has_0 = False
    has_1 = False
    for i in reversed(range(len(ys))):
        if ys[i] == 0 and has_0 == False:
            indices.append(i)
            has_0 = True
        elif ys[i] == 1 and has_1 == False:
            indices.append(i)
            has_1 = True
        if has_0 and has_1:
            break
    
    feature_embs = np.array(torch.cat([embs_local[i].to('cpu') for i in indices]).to('cpu'))
    scaler = preprocessing.StandardScaler().fit(feature_embs)
    feature_embs = scaler.transform(feature_embs)
    print(len(feature_embs), len(ys))
    
    lin_class = SVC(max_iter=50000, kernel='linear',  class_weight='balanced', C=.1).fit(feature_embs, np.array([ys[i] for i in indices]))
    coef_ = torch.tensor(lin_class.coef_, dtype=torch.double)
    coef_ = (coef_.flatten() / (coef_.flatten().norm())).unsqueeze(0)
    
    return coef_

# TODO add to state instead of shared across all
glob_idx = 0

def next_image(embs, img_embs, ys, calibrate_prompts):
    global glob_idx
    glob_idx = glob_idx + 1
    if glob_idx >= 12:
        glob_idx = 0

    # handle case where every instance of calibration prompts is 'Neither' or 'Like' or 'Dislike'
    if len(calibrate_prompts) == 0 and len(list(set(ys))) <= 1:
        embs.append(.01*torch.randn(1, 2048))
        embs.append(.01*torch.randn(1, 2048))
        img_embs.append(.01*torch.randn(1, 1024))
        img_embs.append(.01*torch.randn(1, 1024))
        ys.append(0)
        ys.append(1)
        
    with torch.no_grad():
        if len(calibrate_prompts) > 0:
            print('######### Calibrating with sample prompts #########')
            prompt = calibrate_prompts.pop(0)
            print(prompt)
            image, img_emb = predict(prompt)
            im_emb = autoencoder.embed(prompt)
            embs.append(im_emb)
            img_embs.append(img_emb)
            return image, embs, img_embs, ys, calibrate_prompts, prompt
        else:
            print('######### Roaming #########')
            
            pos_indices = [i for i in range(len(embs)) if ys[i] == 1]
            neg_indices = [i for i in range(len(embs)) if ys[i] == 0]

            if len(neg_indices) > 40:
                neg_indices = neg_indices[1:]
                # popping first negative rating due to > 25
            
            indices = pos_indices + neg_indices
            embs = [embs[i] for i in indices]
            img_embs = [img_embs[i] for i in indices]
            ys = [ys[i] for i in indices]

            im_s = get_coeff(embs, ys)
            rng_prompt = random.choice(prompt_list)
            w = 1.4# if len(embs) % 2 == 0 else 0
            
            prompt= '' if not glob_idx % 3 == 0 else rng_prompt
            prompt, _ = generate(prompt, in_embs=im_s)
            print(prompt)
            im_emb = autoencoder.embed(prompt)
            embs.append(im_emb)
            
            learn_emb = get_coeff(img_embs, ys)
            img_emb = w * learn_emb.to(dtype=torch.float16)
            image, img_emb = predict(prompt, im_emb=img_emb)
            img_embs.append(img_emb)
            
            return image, embs, img_embs, ys, calibrate_prompts, prompt









def start(_, embs, img_embs, ys, calibrate_prompts):
    image, embs, img_embs, ys, calibrate_prompts, prompt = next_image(embs, img_embs, ys, calibrate_prompts)
    return [
            gr.Button(value='Like (L)', interactive=True), 
            gr.Button(value='Neither (Space)', interactive=True), 
            gr.Button(value='Dislike (A)', interactive=True),
            gr.Button(value='Start', interactive=False),
            image,
            embs,
            img_embs,
            ys,
            calibrate_prompts,
            prompt
            ]


def choose(img, choice, embs, img_embs, ys, calibrate_prompts):
    if choice == 'Like (L)':
        choice = 1
    elif choice == 'Neither (Space)':
        _ = embs.pop(-1)
        _ = img_embs.pop(-1)
        img, embs, img_embs, ys, calibrate_prompts, prompt = next_image(embs, img_embs, ys, calibrate_prompts)
        return img, embs, img_embs, ys, calibrate_prompts, prompt
    else:
        choice = 0
    
    if img is None:
        print('NSFW -- choice is disliked')
        choice = 0
        
    ys.append(choice)
    img, embs, img_embs, ys, calibrate_prompts, prompt = next_image(embs, img_embs, ys, calibrate_prompts)
    return img, embs, img_embs, ys, calibrate_prompts, prompt

css = '''.gradio-container{max-width: 700px !important}
#description{text-align: center}
#description h1, #description h3{display: block}
#description p{margin-top: 0}
.fade-in-out {animation: fadeInOut 3s forwards}
@keyframes fadeInOut {
    0% {
      background: var(--bg-color);
    }
    100% {
      background: var(--button-secondary-background-fill);
    }
}
'''
js_head = '''
<script>
document.addEventListener('keydown', function(event) {
    if (event.key === 'a' || event.key === 'A') {
        // Trigger click on 'dislike' if 'A' is pressed
        document.getElementById('dislike').click();
    } else if (event.key === ' ' || event.keyCode === 32) {
        // Trigger click on 'neither' if Spacebar is pressed
        document.getElementById('neither').click();
    } else if (event.key === 'l' || event.key === 'L') {
        // Trigger click on 'like' if 'L' is pressed
        document.getElementById('like').click();
    }
});
function fadeInOut(button, color) {
  button.style.setProperty('--bg-color', color);
  button.classList.remove('fade-in-out');
  void button.offsetWidth; // This line forces a repaint by accessing a DOM property
  
  button.classList.add('fade-in-out');
  button.addEventListener('animationend', () => {
    button.classList.remove('fade-in-out'); // Reset the animation state
  }, {once: true});
}
document.body.addEventListener('click', function(event) {
    const target = event.target;
    if (target.id === 'dislike') {
      fadeInOut(target, '#ff1717');
    } else if (target.id === 'like') {
      fadeInOut(target, '#006500');
    } else if (target.id === 'neither') {
      fadeInOut(target, '#cccccc');
    }
});
</script>
'''

with gr.Blocks(css=css, head=js_head) as demo:
    gr.Markdown('''### Zahir: Generative Recommenders for Unprompted, Scalable Exploration
    Explore the latent space without prompting based on your feedback. Learn more on [the write-up](https://rynmurdock.github.io/posts/2024/3/generative_recomenders/).
    ''', elem_id="description")
    embs = gr.State([])
    img_embs = gr.State([])
    ys = gr.State([])
    calibrate_prompts = gr.State([
    'the moon is melting into my glass of tea',
    'a sea slug -- pair of claws scuttling -- jelly fish glowing',
    'an adorable creature. It may be a goblin or a pig or a slug.',
    'an animation about a gorgeous nebula',
    'a sketch of an impressive mountain by da vinci',
    'a watercolor painting: the octopus writhes',
    ])
    with gr.Row():
        prompt = gr.Textbox(interactive=False, elem_id="text")
    with gr.Row(elem_id='output-image'):
        img = gr.Image(interactive=False, elem_id='output-image', width=700)
    with gr.Row(equal_height=True):
        b3 = gr.Button(value='Dislike (A)', interactive=False, elem_id="dislike")
        b2 = gr.Button(value='Neither (Space)', interactive=False, elem_id="neither")
        b1 = gr.Button(value='Like (L)', interactive=False, elem_id="like")
        b1.click(
        choose, 
        [img, b1, embs, img_embs, ys, calibrate_prompts],
        [img, embs, img_embs, ys, calibrate_prompts, prompt]
        )
        b2.click(
        choose, 
        [img, b2, embs, img_embs, ys, calibrate_prompts],
        [img, embs, img_embs, ys, calibrate_prompts, prompt]
        )
        b3.click(
        choose, 
        [img, b3, embs, img_embs, ys, calibrate_prompts],
        [img, embs, img_embs, ys, calibrate_prompts, prompt]
        )
    with gr.Row():
        b4 = gr.Button(value='Start')
        b4.click(start,
                 [b4, embs, img_embs, ys, calibrate_prompts],
                 [b1, b2, b3, b4, img, embs, img_embs, ys, calibrate_prompts, prompt])
    with gr.Row():
        html = gr.HTML('''<div style='text-align:center; font-size:20px'>You will calibrate for several prompts and then roam. </ div><br><br><br>
<div style='text-align:center; font-size:14px'>Note that while the SDXL model is unlikely to produce NSFW images, it still may be possible, and users should avoid NSFW content when rating.
</ div>''')

demo.launch(share=True)  # Share your demo with just 1 extra parameter 🚀