from diffsynth import save_video, ModelManager, SVDVideoPipeline, HunyuanDiTImagePipeline, download_models
from diffsynth import ModelManager
import torch, os

# The models will be downloaded automatically.
# You can also use the following urls to download them manually.

# Download models (from Huggingface)
#   Text-to-image model:
#     `models/HunyuanDiT/t2i/clip_text_encoder/pytorch_model.bin`: [link](https://huggingface.co/Tencent-Hunyuan/HunyuanDiT/resolve/main/t2i/clip_text_encoder/pytorch_model.bin)
#     `models/HunyuanDiT/t2i/mt5/pytorch_model.bin`: [link](https://huggingface.co/Tencent-Hunyuan/HunyuanDiT/resolve/main/t2i/mt5/pytorch_model.bin)
#     `models/HunyuanDiT/t2i/model/pytorch_model_ema.pt`: [link](https://huggingface.co/Tencent-Hunyuan/HunyuanDiT/resolve/main/t2i/model/pytorch_model_ema.pt)
#     `models/HunyuanDiT/t2i/sdxl-vae-fp16-fix/diffusion_pytorch_model.bin`: [link](https://huggingface.co/Tencent-Hunyuan/HunyuanDiT/resolve/main/t2i/sdxl-vae-fp16-fix/diffusion_pytorch_model.bin)
#   Stable Video Diffusion model:
#     `models/stable_video_diffusion/svd_xt.safetensors`: [link](https://huggingface.co/stabilityai/stable-video-diffusion-img2vid-xt/resolve/main/svd_xt.safetensors)
#   ExVideo extension blocks:
#     `models/stable_video_diffusion/model.fp16.safetensors`: [link](https://huggingface.co/ECNU-CILab/ExVideo-SVD-128f-v1/resolve/main/model.fp16.safetensors)

# Download models (from Modelscope)
#   Text-to-image model:
#     `models/HunyuanDiT/t2i/clip_text_encoder/pytorch_model.bin`: [link](https://www.modelscope.cn/api/v1/models/modelscope/HunyuanDiT/repo?Revision=master&FilePath=t2i%2Fclip_text_encoder%2Fpytorch_model.bin)
#     `models/HunyuanDiT/t2i/mt5/pytorch_model.bin`: [link](https://www.modelscope.cn/api/v1/models/modelscope/HunyuanDiT/repo?Revision=master&FilePath=t2i%2Fmt5%2Fpytorch_model.bin)
#     `models/HunyuanDiT/t2i/model/pytorch_model_ema.pt`: [link](https://www.modelscope.cn/api/v1/models/modelscope/HunyuanDiT/repo?Revision=master&FilePath=t2i%2Fmodel%2Fpytorch_model_ema.pt)
#     `models/HunyuanDiT/t2i/sdxl-vae-fp16-fix/diffusion_pytorch_model.bin`: [link](https://www.modelscope.cn/api/v1/models/modelscope/HunyuanDiT/repo?Revision=master&FilePath=t2i%2Fsdxl-vae-fp16-fix%2Fdiffusion_pytorch_model.bin)
#   Stable Video Diffusion model:
#     `models/stable_video_diffusion/svd_xt.safetensors`: [link](https://www.modelscope.cn/api/v1/models/AI-ModelScope/stable-video-diffusion-img2vid-xt/repo?Revision=master&FilePath=svd_xt.safetensors)
#   ExVideo extension blocks:
#     `models/stable_video_diffusion/model.fp16.safetensors`: [link](https://modelscope.cn/api/v1/models/ECNU-CILab/ExVideo-SVD-128f-v1/repo?Revision=master&FilePath=model.fp16.safetensors)


def generate_image():
    # Load models
    os.environ["TOKENIZERS_PARALLELISM"] = "True"
    download_models(["HunyuanDiT"])
    model_manager = ModelManager(torch_dtype=torch.float16, device="cuda",
                                 file_path_list=[
                                     "models/HunyuanDiT/t2i/clip_text_encoder/pytorch_model.bin",
                                     "models/HunyuanDiT/t2i/mt5/pytorch_model.bin",
                                     "models/HunyuanDiT/t2i/model/pytorch_model_ema.pt",
                                     "models/HunyuanDiT/t2i/sdxl-vae-fp16-fix/diffusion_pytorch_model.bin",
                                 ])
    pipe = HunyuanDiTImagePipeline.from_model_manager(model_manager)

    # Generate an image
    torch.manual_seed(0)
    image = pipe(
        prompt="bonfire, on the stone",
        negative_prompt="错误的眼睛，糟糕的人脸，毁容，糟糕的艺术，变形，多余的肢体，模糊的颜色，模糊，重复，病态，残缺，",
        num_inference_steps=50, height=1024, width=1024,
    )
    model_manager.to("cpu")
    return image


def generate_video(image):
    # Load models
    download_models(["stable-video-diffusion-img2vid-xt", "ExVideo-SVD-128f-v1"])
    model_manager = ModelManager(torch_dtype=torch.float16, device="cuda",
                                 file_path_list=[
                                     "models/stable_video_diffusion/svd_xt.safetensors",
                                     "models/stable_video_diffusion/model.fp16.safetensors",
                                 ])
    pipe = SVDVideoPipeline.from_model_manager(model_manager)

    # Generate a video
    torch.manual_seed(1)
    video = pipe(
        input_image=image.resize((512, 512)),
        num_frames=128, fps=30, height=512, width=512,
        motion_bucket_id=127,
        num_inference_steps=50,
        min_cfg_scale=2, max_cfg_scale=2, contrast_enhance_scale=1.2
    )
    model_manager.to("cpu")
    return video


def upscale_video(image, video):
    # Load models
    download_models(["stable-video-diffusion-img2vid-xt", "ExVideo-SVD-128f-v1"])
    model_manager = ModelManager(torch_dtype=torch.float16, device="cuda",
                                 file_path_list=[
                                     "models/stable_video_diffusion/svd_xt.safetensors",
                                     "models/stable_video_diffusion/model.fp16.safetensors",
                                 ])
    pipe = SVDVideoPipeline.from_model_manager(model_manager)

    # Generate a video
    torch.manual_seed(2)
    video = pipe(
        input_image=image.resize((1024, 1024)),
        input_video=[frame.resize((1024, 1024)) for frame in video], denoising_strength=0.5,
        num_frames=128, fps=30, height=1024, width=1024,
        motion_bucket_id=127,
        num_inference_steps=25,
        min_cfg_scale=2, max_cfg_scale=2, contrast_enhance_scale=1.2
    )
    model_manager.to("cpu")
    return video


# We use Hunyuan DiT to generate the first frame. 10GB VRAM is required.
# If you want to use your own image,
# please use `image = Image.open("your_image_file.png")` to replace the following code.
image = generate_image()
image.save("image.png")

# Now, generate a video with resolution of 512. 20GB VRAM is required.
video = generate_video(image)
save_video(video, "video_512.mp4", fps=30)

# Upscale the video. 52GB VRAM is required.
video = upscale_video(image, video)
save_video(video, "video_1024.mp4", fps=30)