# Adapted from https://github.com/luosiallen/latent-consistency-model
from __future__ import annotations

import argparse
from functools import partial
import os
import random
import time
from omegaconf import OmegaConf

import gradio as gr
import numpy as np

try:
    import intel_extension_for_pytorch as ipex
except:
    pass

from utils.lora import collapse_lora, monkeypatch_remove_lora
from utils.lora_handler import LoraHandler
from utils.common_utils import load_model_checkpoint
from utils.utils import instantiate_from_config
from scheduler.t2v_turbo_scheduler import T2VTurboScheduler
from pipeline.t2v_turbo_vc2_pipeline import T2VTurboVC2Pipeline

import torch
import torchvision

from concurrent.futures import ThreadPoolExecutor
import uuid

DESCRIPTION = """# T2V-Turbo 🚀

Our model is distilled from [VideoCrafter2](https://ailab-cvc.github.io/videocrafter2/).

T2V-Turbo learns a LoRA on top of the base model by aligning to the reward feedback from [HPSv2.1](https://github.com/tgxs002/HPSv2/tree/master) and [InternVid2 Stage 2 Model](https://huggingface.co/OpenGVLab/InternVideo2-Stage2_1B-224p-f4).

T2V-Turbo-v2 optimizes the training techniques by finetuning the full base model and further aligns to [CLIPScore](https://huggingface.co/laion/CLIP-ViT-H-14-laion2B-s32B-b79K)

T2V-Turbo trains on pure WebVid-10M data, whereas T2V-Turbo-v2 carufully optimizes different learning objectives with a mixutre of VidGen-1M and WebVid-10M data.

Moreover, T2V-Turbo-v2 supports to distill motion priors from the training videos. 

[Project page for T2V-Turbo](https://t2v-turbo.github.io) 🥳

[Project page for T2V-Turbo-v2](https://t2v-turbo-v2.github.io) 🤓
"""
if torch.cuda.is_available():
    DESCRIPTION += "\n<p>Running on CUDA 😀</p>"
elif hasattr(torch, "xpu") and torch.xpu.is_available():
    DESCRIPTION += "\n<p>Running on XPU 🤓</p>"
else:
    DESCRIPTION += "\n<p>Running on CPU 🥶 This demo does not work on CPU.</p>"

MAX_SEED = np.iinfo(np.int32).max
CACHE_EXAMPLES = torch.cuda.is_available() and os.getenv("CACHE_EXAMPLES") == "1"
USE_TORCH_COMPILE = os.getenv("USE_TORCH_COMPILE") == "1"


"""
Operation System Options:
    If you are using MacOS, please set the following (device="mps") ;
    If you are using Linux & Windows with Nvidia GPU, please set the device="cuda";
    If you are using Linux & Windows with Intel Arc GPU, please set the device="xpu";
"""
# device = "mps"    # MacOS
# device = "xpu"    # Intel Arc GPU
device = "cuda"  # Linux & Windows


"""
   DTYPE Options:
      To reduce GPU memory you can set "DTYPE=torch.float16",
      but image quality might be compromised
"""
DTYPE = torch.bfloat16


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


def save_video(
    vid_tensor, profile: gr.OAuthProfile | None, metadata: dict, root_path="./", fps=16
):
    unique_name = str(uuid.uuid4()) + ".mp4"
    unique_name = os.path.join(root_path, unique_name)

    video = vid_tensor.detach().cpu()
    video = torch.clamp(video.float(), -1.0, 1.0)
    video = video.permute(1, 0, 2, 3)  # t,c,h,w
    video = (video + 1.0) / 2.0
    video = (video * 255).to(torch.uint8).permute(0, 2, 3, 1)

    torchvision.io.write_video(
        unique_name, video, fps=fps, video_codec="h264", options={"crf": "10"}
    )
    return unique_name


def save_videos(
    video_array, profile: gr.OAuthProfile | None, metadata: dict, fps: int = 16
):
    paths = []
    root_path = "./videos/"
    os.makedirs(root_path, exist_ok=True)
    with ThreadPoolExecutor() as executor:
        paths = list(
            executor.map(
                save_video,
                video_array,
                [profile] * len(video_array),
                [metadata] * len(video_array),
                [root_path] * len(video_array),
                [fps] * len(video_array),
            )
        )
    return paths[0]


def generate(
    prompt: str,
    seed: int = 0,
    guidance_scale: float = 7.5,
    percentage: float = 0.3,
    num_inference_steps: int = 4,
    num_frames: int = 16,
    fps: int = 16,
    randomize_seed: bool = False,
    param_dtype="bf16",
    motion_gs: float = 0.05,
    use_motion_cond: bool = False,
    progress=gr.Progress(track_tqdm=True),
    profile: gr.OAuthProfile | None = None,
):
    seed = randomize_seed_fn(seed, randomize_seed)
    torch.manual_seed(seed)

    if param_dtype == "bf16":
        dtype = torch.bfloat16
        unet.dtype = torch.bfloat16
    elif param_dtype == "fp16":
        dtype = torch.float16
        unet.dtype = torch.float16
    elif param_dtype == "fp32":
        dtype = torch.float32
        unet.dtype = torch.float32
    else:
        raise ValueError(f"Unknown dtype: {param_dtype}")

    pipeline.unet.to(device, dtype)
    pipeline.text_encoder.to(device, dtype)
    pipeline.vae.to(device, dtype)
    pipeline.to(device, dtype)

    start_time = time.time()

    result = pipeline(
        prompt=prompt,
        frames=num_frames,
        fps=fps,
        guidance_scale=guidance_scale,
        motion_gs=motion_gs,
        use_motion_cond=use_motion_cond,
        percentage=percentage,
        num_inference_steps=num_inference_steps,
        lcm_origin_steps=200,
        num_videos_per_prompt=1,
    )
    paths = save_videos(
        result,
        profile,
        metadata={
            "prompt": prompt,
            "seed": seed,
            "guidance_scale": guidance_scale,
            "num_inference_steps": num_inference_steps,
        },
        fps=fps,
    )
    print(time.time() - start_time)
    return paths, seed


examples = [
    "An astronaut riding a horse.",
    "Darth vader surfing in waves.",
    "Robot dancing in times square.",
    "Clown fish swimming through the coral reef.",
    "Pikachu snowboarding.",
    "With the style of van gogh, A young couple dances under the moonlight by the lake.",
    "A young woman with glasses is jogging in the park wearing a pink headband.",
    "Impressionist style, a yellow rubber duck floating on the wave on the sunset",
    "Self-portrait oil painting, a beautiful cyborg with golden hair, 8k",
    "With the style of low-poly game art, A majestic, white horse gallops gracefully across a moonlit beach.",
]


if __name__ == "__main__":
    # Add model name as parameter
    parser = argparse.ArgumentParser(description="Gradio demo for T2V-Turbo.")
    parser.add_argument(
        "--unet_dir",
        type=str,
        default="output/vlcm_vc2_mixed_vid_gen_128k_bs3_percen_0p2_mgs_max_0p1/checkpoint-10000/unet.pt",
        help="Directory of the UNet model",
    )
    parser.add_argument(
        "--base_model_dir",
        type=str,
        default="model_cache/VideoCrafter2_model.ckpt",
        help="Directory of the VideoCrafter2 checkpoint.",
    )
    parser.add_argument(
        "--version",
        required=True,
        choices=["v1", "v2"],
        help="Whether to use motion condition or not.",
    )
    parser.add_argument(
        "--motion_gs",
        default=0.05,
        type=float,
        help="Guidance scale for motion condition.",
    )

    args = parser.parse_args()

    config = OmegaConf.load("configs/inference_t2v_512_v2.0.yaml")
    model_config = config.pop("model", OmegaConf.create())
    pretrained_t2v = instantiate_from_config(model_config)
    pretrained_t2v = load_model_checkpoint(pretrained_t2v, args.base_model_dir)

    unet_config = model_config["params"]["unet_config"]
    unet_config["params"]["use_checkpoint"] = False
    unet_config["params"]["time_cond_proj_dim"] = 256

    if args.version == "v2":
        unet_config["params"]["motion_cond_proj_dim"] = 256
    unet = instantiate_from_config(unet_config)

    if "lora" in args.unet_dir:
        unet.load_state_dict(
            pretrained_t2v.model.diffusion_model.state_dict(), strict=False
        )

        use_unet_lora = True
        lora_manager = LoraHandler(
            version="cloneofsimo",
            use_unet_lora=use_unet_lora,
            save_for_webui=True,
            unet_replace_modules=["UNetModel"],
        )
        lora_manager.add_lora_to_model(
            use_unet_lora,
            unet,
            lora_manager.unet_replace_modules,
            lora_path=args.unet_dir,
            dropout=0.1,
            r=64,
        )
        collapse_lora(unet, lora_manager.unet_replace_modules)
        monkeypatch_remove_lora(unet)
    else:
        unet.load_state_dict(torch.load(args.unet_dir, map_location=device))

    unet.eval()
    pretrained_t2v.model.diffusion_model = unet
    scheduler = T2VTurboScheduler(
        linear_start=model_config["params"]["linear_start"],
        linear_end=model_config["params"]["linear_end"],
    )
    pipeline = T2VTurboVC2Pipeline(pretrained_t2v, scheduler, model_config)

    pipeline.to(device)

    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_video = gr.Video(
                label="Generated Video", interactive=False, autoplay=True
            )
        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)
            dtype_choices = ["bf16", "fp16", "fp32"]
            param_dtype = gr.Radio(
                dtype_choices,
                label="torch.dtype",
                value=dtype_choices[0],
                interactive=True,
                info="To save GPU memory, use fp16 or bf16. For better quality, use fp32.",
            )
            with gr.Row():
                percentage = gr.Slider(
                    label="Percentage of steps to apply motion guidance (v2 w/ MG only)",
                    minimum=0.0,
                    maximum=0.5,
                    step=0.05,
                    value=0.3,
                )

            with gr.Row():
                guidance_scale = gr.Slider(
                    label="Guidance scale for base",
                    minimum=2,
                    maximum=14,
                    step=0.1,
                    value=7.5,
                )
                num_inference_steps = gr.Slider(
                    label="Number of inference steps for base",
                    minimum=4,
                    maximum=50,
                    step=1,
                    value=8,
                )
            with gr.Row():
                num_frames = gr.Slider(
                    label="Number of Video Frames",
                    minimum=16,
                    maximum=48,
                    step=8,
                    value=16,
                )
                fps = gr.Slider(
                    label="FPS",
                    minimum=8,
                    maximum=32,
                    step=4,
                    value=8,
                )

        use_motion_cond = args.version == "v1"
        generate = partial(
            generate, use_motion_cond=use_motion_cond, motion_gs=args.motion_gs
        )
        gr.Examples(
            examples=examples,
            inputs=prompt,
            outputs=result_video,
            fn=generate,
            cache_examples=CACHE_EXAMPLES,
        )

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

    demo.queue(api_open=False)
    # demo.queue(max_size=20).launch()
    demo.launch()