#!/usr/bin/env python
from __future__ import annotations

import os
import random
import time

import gradio as gr
import numpy as np
import PIL.Image

from diffusers import DiffusionPipeline

from lcm_scheduler import LCMScheduler
from lcm_ov_pipeline import OVLatentConsistencyModelPipeline

import os
from tqdm import tqdm
import gradio_user_history as gr_user_history

from concurrent.futures import ThreadPoolExecutor
import uuid

DESCRIPTION = '''# Latent Consistency Model OpenVino CPU
Based on [Latency Consistency Model](https://huggingface.co/spaces/SimianLuo/Latent_Consistency_Model) HF space 

Distilled from [Dreamshaper v7](https://huggingface.co/Lykon/dreamshaper-7) fine-tune of [Stable Diffusion v1-5](https://huggingface.co/runwayml/stable-diffusion-v1-5) with only 4,000 training iterations (~32 A100 GPU Hours). [Project page](https://latent-consistency-models.github.io)

<p>Running on CPU 🥶.</p>
'''

MAX_SEED = np.iinfo(np.int32).max

model_id = "deinferno/LCM_Dreamshaper_v7-openvino"
batch_size = 1
width = int(os.getenv("IMAGE_WIDTH", "512"))
height = int(os.getenv("IMAGE_HEIGHT", "512"))
num_images = int(os.getenv("NUM_IMAGES", "1"))

scheduler = LCMScheduler.from_pretrained(model_id, subfolder="scheduler")
pipe = OVLatentConsistencyModelPipeline.from_pretrained(model_id, scheduler = scheduler, compile = False)
pipe.reshape(batch_size=batch_size, height=height, width=width, num_images_per_prompt=num_images)
pipe.compile()

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

def save_image(img, profile: gr.OAuthProfile | None, metadata: dict):
    unique_name = str(uuid.uuid4()) + '.png'
    img.save(unique_name)
    gr_user_history.save_image(label=metadata["prompt"], image=img, profile=profile, metadata=metadata)
    return unique_name

def save_images(image_array, profile: gr.OAuthProfile | None, metadata: dict):
    paths = []
    with ThreadPoolExecutor() as executor:
        paths = list(executor.map(save_image, image_array, [profile]*len(image_array), [metadata]*len(image_array)))
    return paths

def generate(
    prompt: str,
    seed: int = 0,
    guidance_scale: float = 8.0,
    num_inference_steps: int = 4,
    randomize_seed: bool = False,
    progress = gr.Progress(track_tqdm=True),
    profile: gr.OAuthProfile | None = None,
) -> PIL.Image.Image:
    global batch_size
    global width
    global height
    global num_images

    seed = randomize_seed_fn(seed, randomize_seed)
    np.random.seed(seed)
    start_time = time.time()
    result = pipe(
        prompt=prompt,
        width=width,
        height=height,
        guidance_scale=guidance_scale,
        num_inference_steps=num_inference_steps,
        num_images_per_prompt=num_images,
        output_type="pil",
    ).images
    paths = save_images(result, profile, metadata={"prompt": prompt, "seed": seed, "width": width, "height": height, "guidance_scale": guidance_scale, "num_inference_steps": num_inference_steps})
    print(time.time() - start_time)
    return paths, seed

examples = [
    "portrait photo of a girl, photograph, highly detailed face, depth of field, moody light, golden hour, style by Dan Winters, Russell James, Steve McCurry, centered, extremely detailed, Nikon D850, award winning photography",
    "Self-portrait oil painting, a beautiful cyborg with golden hair, 8k",
    "Astronaut in a jungle, cold color palette, muted colors, detailed, 8k",
    "A photo of beautiful mountain with realistic sunset and blue lake, highly detailed, masterpiece",
]

with gr.Blocks(css="style.css") as demo:
    gr.Markdown(DESCRIPTION)
    gr.DuplicateButton(
        value="Duplicate Space for private use",
        elem_id="duplicate-button",
        visible=os.getenv("SHOW_DUPLICATE_BUTTON") == "1",
    )
    with gr.Group():
        with gr.Row():
            prompt = gr.Text(
                label="Prompt",
                show_label=False,
                max_lines=1,
                placeholder="Enter your prompt",
                container=False,
            )
            run_button = gr.Button("Run", scale=0)
        result = gr.Gallery(
            label="Generated images", show_label=False, elem_id="gallery", grid=[2]
        )
    with gr.Accordion("Advanced options", open=False):
        seed = gr.Slider(
            label="Seed",
            minimum=0,
            maximum=MAX_SEED,
            step=1,
            value=0,
            randomize=True
        )
        randomize_seed = gr.Checkbox(label="Randomize seed across runs", value=True)
        with gr.Row():
            guidance_scale = gr.Slider(
                label="Guidance scale for base",
                minimum=2,
                maximum=14,
                step=0.1,
                value=8.0,
            )
            num_inference_steps = gr.Slider(
                label="Number of inference steps for base",
                minimum=1,
                maximum=8,
                step=1,
                value=4,
            )

    with gr.Accordion("Past generations", open=False):
        gr_user_history.render()
    
    gr.Examples(
        examples=examples,
        inputs=prompt,
        outputs=result,
        fn=generate,
        cache_examples=CACHE_EXAMPLES,
    )

    gr.on(
        triggers=[
            prompt.submit,
            run_button.click,
        ],
        fn=generate,
        inputs=[
            prompt,
            seed,
            guidance_scale,
            num_inference_steps,
            randomize_seed
        ],
        outputs=[result, seed],
        api_name="run",
    )

if __name__ == "__main__":
    demo.queue(api_open=False)
    # demo.queue(max_size=20).launch()
    demo.launch()