import gradio as gr
import torch
import os
import random
import time
import math
import spaces
from glob import glob
from pathlib import Path
from typing import Optional

from diffusers import StableVideoDiffusionPipeline
from diffusers.utils import export_to_video, export_to_gif
from PIL import Image

fps25Pipe = StableVideoDiffusionPipeline.from_pretrained(
    "vdo/stable-video-diffusion-img2vid-xt-1-1", torch_dtype=torch.float16, variant="fp16"
)
fps25Pipe.to("cuda")

fps14Pipe = StableVideoDiffusionPipeline.from_pretrained(
    "stabilityai/stable-video-diffusion-img2vid", torch_dtype=torch.float16, variant="fp16"
)
fps14Pipe.to("cuda")

dragnuwaPipe = StableVideoDiffusionPipeline.from_pretrained(
    "a-r-r-o-w/dragnuwa-svd", torch_dtype=torch.float16, variant="fp16", low_cpu_mem_usage=False, device_map=None
)
dragnuwaPipe.to("cuda")

max_64_bit_int = 2**63 - 1

def animate(
    image: Image,
    seed: Optional[int] = 42,
    randomize_seed: bool = True,
    motion_bucket_id: int = 127,
    fps_id: int = 25,
    noise_aug_strength: float = 0.1,
    decoding_t: int = 3,
    video_format: str = "mp4",
    frame_format: str = "webp",
    version: str = "auto",
    width: int = 1024,
    height: int = 576
):
    start = time.time()
    output_folder = "outputs"
    if image.mode == "RGBA":
        image = image.convert("RGB")
        
    if randomize_seed:
        seed = random.randint(0, max_64_bit_int)
    
    if version == "auto":
        if 14 < fps_id:
            version = "svdxt"
        else:
            version = "svd"

    frames = animate_on_gpu(
        image,
        seed,
        motion_bucket_id,
        fps_id,
        noise_aug_strength,
        decoding_t,
        version,
        width,
        height
    )
    
    os.makedirs(output_folder, exist_ok=True)
    base_count = len(glob(os.path.join(output_folder, "*." + video_format)))
    result_path = os.path.join(output_folder, f"{base_count:06d}." + video_format)

    if video_format == "gif":
        video_path = None
        gif_path = result_path
        export_to_gif(image=frames, output_gif_path=gif_path, fps=fps_id)
    else:
        video_path = result_path
        gif_path = None
        export_to_video(frames, video_path, fps=fps_id)
    
    end = time.time()
    secondes = int(end - start)
    minutes = math.floor(secondes / 60)
    secondes = secondes - (minutes * 60)
    hours = math.floor(minutes / 60)
    minutes = minutes - (hours * 60)
    information = ("Start the process again if you want a different result. " if randomize_seed else "") + \
    "Wait 2 min before a new run to avoid quota penalty or use another computer. " + \
    "The video has been generated in " + \
    ((str(hours) + " h, ") if hours != 0 else "") + \
    ((str(minutes) + " min, ") if hours != 0 or minutes != 0 else "") + \
    str(secondes) + " sec."
    
    return [
        # Display for video
        gr.update(value = video_path, visible=video_format != "gif"),
        # Display for gif
        gr.update(value = gif_path, visible = video_format == "gif"),
        # Download button
        gr.update(label = "💾 Download animation in *." + video_format + " format", value=result_path, visible=True),
        # Frames
        gr.update(label = "Generated frames in *." + frame_format + " format", format = frame_format, value = frames, visible = True),
        # Used seed
        seed,
        # Information
        gr.update(value = information, visible = True),
        # Reset button
        gr.update(visible = True)
    ]

@torch.no_grad()
@spaces.GPU(duration=180)
def animate_on_gpu(
    image: Image,
    seed: Optional[int] = 42,
    motion_bucket_id: int = 127,
    fps_id: int = 6,
    noise_aug_strength: float = 0.1,
    decoding_t: int = 3,
    version: str = "svdxt",
    width: int = 1024,
    height: int = 576
):
    generator = torch.manual_seed(seed)

    if version == "dragnuwa":
        return dragnuwaPipe(image, width=width, height=height, decode_chunk_size=decoding_t, generator=generator, motion_bucket_id=motion_bucket_id, noise_aug_strength=noise_aug_strength, num_frames=25).frames[0]
    elif version == "svdxt":
        return fps25Pipe(image, width=width, height=height, decode_chunk_size=decoding_t, generator=generator, motion_bucket_id=motion_bucket_id, noise_aug_strength=noise_aug_strength, num_frames=25).frames[0]
    else:
        return fps14Pipe(image, width=width, height=height, decode_chunk_size=decoding_t, generator=generator, motion_bucket_id=motion_bucket_id, noise_aug_strength=noise_aug_strength, num_frames=25).frames[0]


def resize_image(image, output_size=(1024, 576)):
    # Calculate aspect ratios
    target_aspect = output_size[0] / output_size[1]  # Aspect ratio of the desired size
    image_aspect = image.width / image.height  # Aspect ratio of the original image

    # Do not touch the image if the size is good
    if image.width == output_size[0] and image.height == output_size[1]:
        return image

    # Resize if the original image is larger
    if image_aspect > target_aspect:
        # Resize the image to match the target height, maintaining aspect ratio
        new_height = output_size[1]
        new_width = int(new_height * image_aspect)
        resized_image = image.resize((new_width, new_height), Image.LANCZOS)
        # Calculate coordinates for cropping
        left = (new_width - output_size[0]) / 2
        top = 0
        right = (new_width + output_size[0]) / 2
        bottom = output_size[1]
    else:
        # Resize the image to match the target width, maintaining aspect ratio
        new_width = output_size[0]
        new_height = int(new_width / image_aspect)
        resized_image = image.resize((new_width, new_height), Image.LANCZOS)
        # Calculate coordinates for cropping
        left = 0
        top = (new_height - output_size[1]) / 2
        right = output_size[0]
        bottom = (new_height + output_size[1]) / 2

    # Crop the image
    return resized_image.crop((left, top, right, bottom))

def reset():
    return [
        None,
        random.randint(0, max_64_bit_int),
        True,
        127,
        6,
        0.1,
        3,
        "mp4",
        "webp",
        "auto"
    ]

with gr.Blocks() as demo:
  gr.HTML("""
    <h1><center>Image-to-Video</center></h1>
    <big><center>Animate your image into 25 frames of 1024x576 pixels freely, without account, without watermark and download the video</center></big>
    <br/>
    
    <p>
    This demo is based on <i>Stable Video Diffusion</i> artificial intelligence.
    No prompt or camera control is handled here.
    To control motions, rather use <i><a href="https://huggingface.co/spaces/TencentARC/MotionCtrl_SVD">MotionCtrl SVD</a></i>.
    If you need 128 frames, rather use <i><a href="https://huggingface.co/spaces/modelscope/ExVideo-SVD-128f-v1">ExVideo</a></i>.
    </p>
    """)
  with gr.Row():
      with gr.Column():
          image = gr.Image(label="Upload your image", type="pil")
          with gr.Accordion("Advanced options", open=False):
              fps_id = gr.Slider(label="Frames per second", info="The length of your video in seconds will be 25/fps", value=25, minimum=5, maximum=30)
              motion_bucket_id = gr.Slider(label="Motion bucket id", info="Controls how much motion to add/remove from the image", value=127, minimum=1, maximum=255)
              noise_aug_strength = gr.Slider(label="Noise strength", info="The noise to add", value=0.1, minimum=0, maximum=1, step=0.1)
              decoding_t = gr.Slider(label="Decoding", info="Number of frames decoded at a time; this eats more VRAM; reduce if necessary", value=3, minimum=1, maximum=5, step=1)
              video_format = gr.Radio([["*.mp4", "mp4"], ["*.avi", "avi"], ["*.wmv", "wmv"], ["*.mkv", "mkv"], ["*.mov", "mov"], ["*.gif", "gif"]], label="Video format for result", info="File extention", value="mp4", interactive=True)
              frame_format = gr.Radio([["*.webp", "webp"], ["*.png", "png"], ["*.jpeg", "jpeg"], ["*.gif (unanimated)", "gif"], ["*.bmp", "bmp"]], label="Image format for frames", info="File extention", value="webp", interactive=True)
              version = gr.Radio([["Auto", "auto"], ["🏃🏻‍♀️ SVD (trained on 14 f/s)", "svd"], ["🏃🏻‍♀️💨 SVD-XT (trained on 25 f/s)", "svdxt"], ["DragNUWA (unstable)", "dragnuwa"]], label="Model", info="Trained model", value="auto", interactive=True)
              seed = gr.Slider(label="Seed", value=42, randomize=True, minimum=0, maximum=max_64_bit_int, step=1)
              randomize_seed = gr.Checkbox(label="Randomize seed", value=True)

          generate_btn = gr.Button(value="🚀 Animate", variant="primary")
          reset_btn = gr.Button(value="🧹 Reinit page", variant="stop", elem_id="reset_button", visible = False)

      with gr.Column():
          video_output = gr.Video(label="Generated video", format="mp4", autoplay=True)
          gif_output = gr.Image(label="Generated video", format="gif", visible=False)
          download_button = gr.DownloadButton(label="💾 Download video", visible=False)
          information_msg = gr.HTML(visible=False)
          gallery = gr.Gallery(label="Generated frames", visible=False)
      
  image.upload(fn=resize_image, inputs=image, outputs=image, queue=False)
  generate_btn.click(fn=animate, inputs=[
      image,
      seed,
      randomize_seed,
      motion_bucket_id,
      fps_id,
      noise_aug_strength,
      decoding_t,
      video_format,
      frame_format,
      version
  ], outputs=[
      video_output,
      gif_output,
      download_button,
      gallery,
      seed,
      information_msg,
      reset_btn
  ], api_name="video")

  reset_btn.click(fn = reset, inputs = [], outputs = [
      image,
      seed,
      randomize_seed,
      motion_bucket_id,
      fps_id,
      noise_aug_strength,
      decoding_t,
      video_format,
      frame_format,
      version
  ], queue = False, show_progress = False)
    
  gr.Examples(
    examples=[
        ["Examples/Fire.webp", 42, True, 127, 25, 0.1, 3, "mp4", "png", "auto"],
        ["Examples/Water.png", 42, True, 127, 25, 0.1, 3, "mp4", "png", "auto"],
        ["Examples/Town.jpeg", 42, True, 127, 25, 0.1, 3, "mp4", "png", "auto"]
    ],
    inputs=[image, seed, randomize_seed, motion_bucket_id, fps_id, noise_aug_strength, decoding_t, video_format, frame_format, version],
    outputs=[video_output, gif_output, download_button, gallery, seed, information_msg, reset_btn],
    fn=animate,
    run_on_click=True,
    cache_examples=False,
  )

if __name__ == "__main__":
    demo.launch(share=True, show_api=False)