import spaces
from huggingface_hub import snapshot_download, hf_hub_download
import os
import subprocess
import importlib, site
from PIL import Image
import uuid
import shutil

# Re-discover all .pth/.egg-link files
for sitedir in site.getsitepackages():
    site.addsitedir(sitedir)

# Clear caches so importlib will pick up new modules
importlib.invalidate_caches()

def sh(cmd): subprocess.check_call(cmd, shell=True)

flash_attention_installed = False

# FlashAttention 설치 시도 - 실패해도 계속 진행
try:
    print("Attempting to download and install FlashAttention wheel...")
    flash_attention_wheel = hf_hub_download(
            repo_id="alexnasa/flash-attn-3",
            repo_type="model",
            filename="128/flash_attn_3-3.0.0b1-cp39-abi3-linux_x86_64.whl",
        )

    sh(f"pip install {flash_attention_wheel}")

    # tell Python to re-scan site-packages now that the egg-link exists
    import importlib, site; site.addsitedir(site.getsitepackages()[0]); importlib.invalidate_caches()

    flash_attention_installed = True
    print("FlashAttention installed successfully.")

except Exception as e:
    print(f"⚠️ Could not install FlashAttention: {e}")
    print("Continuing without FlashAttention...")

# ===== CRITICAL FIX: attention.py 파일 패치 =====
attention_file = "/home/user/app/ovi/modules/attention.py"
if os.path.exists(attention_file):
    try:
        with open(attention_file, 'r') as f:
            content = f.read()
        
        # FLASH_ATTN_3_AVAILABLE 변수가 정의되지 않은 경우를 위한 패치
        if 'FLASH_ATTN_3_AVAILABLE' not in content.split('try:')[0]:
            # 파일 시작 부분에 변수 초기화 추가
            patched_content = f"FLASH_ATTN_3_AVAILABLE = False\n\n{content}"
            
            with open(attention_file, 'w') as f:
                f.write(patched_content)
            
            print("✓ Successfully patched attention.py")
    except Exception as e:
        print(f"⚠️ Could not patch attention.py: {e}")
# ===== END FIX =====

import torch
print(f"Torch version: {torch.__version__}")
print(f"FlashAttention available: {flash_attention_installed}")

os.environ["PROCESSED_RESULTS"] = f"{os.getcwd()}/processed_results"

import gradio as gr
import argparse
from ovi.ovi_fusion_engine import OviFusionEngine, DEFAULT_CONFIG
from diffusers import FluxPipeline
import tempfile
from ovi.utils.io_utils import save_video
from ovi.utils.processing_utils import clean_text, scale_hw_to_area_divisible

# ----------------------------
# Parse CLI Args
# ----------------------------
parser = argparse.ArgumentParser(description="Ovi Joint Video + Audio Gradio Demo")

parser.add_argument(
    "--cpu_offload",
    action="store_true",
    help="Enable CPU offload for both OviFusionEngine and FluxPipeline"
)
args = parser.parse_args()

ckpt_dir = "./ckpts"

# Wan2.2
wan_dir = os.path.join(ckpt_dir, "Wan2.2-TI2V-5B")
snapshot_download(
    repo_id="Wan-AI/Wan2.2-TI2V-5B",
    local_dir=wan_dir,
    allow_patterns=[
        "google/*",
        "models_t5_umt5-xxl-enc-bf16.pth",
        "Wan2.2_VAE.pth"
    ]
)

# MMAudio
mm_audio_dir = os.path.join(ckpt_dir, "MMAudio")
snapshot_download(
    repo_id="hkchengrex/MMAudio",
    local_dir=mm_audio_dir,
    allow_patterns=[
        "ext_weights/best_netG.pt",
        "ext_weights/v1-16.pth"
    ]
)

ovi_dir = os.path.join(ckpt_dir, "Ovi")
snapshot_download(
    repo_id="chetwinlow1/Ovi",
    local_dir=ovi_dir,
    allow_patterns=[
        "model.safetensors"
    ]
)

# Initialize OviFusionEngine
enable_cpu_offload = args.cpu_offload
print(f"loading model...")
DEFAULT_CONFIG['cpu_offload'] = enable_cpu_offload
DEFAULT_CONFIG['mode'] = "t2v"
ovi_engine = OviFusionEngine()
print("loaded model")


def resize_for_model(image_path):
    img = Image.open(image_path)
    w, h = img.size
    aspect_ratio = w / h
    
    if aspect_ratio > 1.5:
        target_size = (992, 512)
    elif aspect_ratio < 0.66:
        target_size = (512, 992)
    else:
        target_size = (512, 512)

    img.thumbnail(target_size, Image.Resampling.LANCZOS)

    new_img = Image.new("RGB", target_size, (0, 0, 0))
    new_img.paste(
        img,
        ((target_size[0] - img.size[0]) // 2,
         (target_size[1] - img.size[1]) // 2)
    )
    return new_img, target_size

def generate_scene(
    text_prompt,
    image,
    sample_steps = 50,
    session_id = None,
    video_seed = 100,
    solver_name = "unipc",
    shift = 5,
    video_guidance_scale = 4,
    audio_guidance_scale = 3,
    slg_layer = 11,
    video_negative_prompt = "",
    audio_negative_prompt = "",
    progress=gr.Progress(track_tqdm=True)
):
    text_prompt_processed = (text_prompt or "").strip()

    if not image:
        raise gr.Error("Please provide an image")
    
    if not text_prompt_processed:
        raise gr.Error("Please enter a prompt.")
    
    return generate_video(text_prompt, 
                        image, 
                        sample_steps, 
                        session_id,
                        video_seed,
                        solver_name,
                        shift,
                        video_guidance_scale,
                        audio_guidance_scale,
                        slg_layer,
                        video_negative_prompt,
                        audio_negative_prompt,
                        progress)

def get_duration(
    text_prompt,
    image,
    sample_steps,
    session_id,
    video_seed,
    solver_name,
    shif,
    video_guidance_scale,
    audio_guidance_scale,
    slg_layer,
    video_negative_prompt,
    audio_negative_prompt,
    progress,
):
    warmup = 20
    return int(sample_steps * 3 + warmup)
    

@spaces.GPU(duration=get_duration)
def generate_video(
    text_prompt,
    image,
    sample_steps = 50,
    session_id = None,
    video_seed = 100,
    solver_name = "unipc",
    shift = 5,
    video_guidance_scale = 4,
    audio_guidance_scale = 3,
    slg_layer = 11,
    video_negative_prompt = "",
    audio_negative_prompt = "",
    progress=gr.Progress(track_tqdm=True)
):
    try:
        image_path = None
        
        if image is not None:
            image_path = image

        if session_id is None:
            session_id = uuid.uuid4().hex
            
        output_dir = os.path.join(os.environ["PROCESSED_RESULTS"], session_id)
        os.makedirs(output_dir, exist_ok=True)
        output_path = os.path.join(output_dir, f"generated_video.mp4")

        _, target_size = resize_for_model(image_path)

        video_frame_width = target_size[0]
        video_frame_height = target_size[1]

        generated_video, generated_audio, _ = ovi_engine.generate(
            text_prompt=text_prompt,
            image_path=image_path,
            video_frame_height_width=[video_frame_height, video_frame_width],
            seed=video_seed,
            solver_name=solver_name,
            sample_steps=sample_steps,
            shift=shift,
            video_guidance_scale=video_guidance_scale,
            audio_guidance_scale=audio_guidance_scale,
            slg_layer=slg_layer,
            video_negative_prompt=video_negative_prompt,
            audio_negative_prompt=audio_negative_prompt,
        )

        save_video(output_path, generated_video, generated_audio, fps=24, sample_rate=16000)

        return output_path
    except Exception as e:
        print(f"Error during video generation: {e}")
        return None


def cleanup(request: gr.Request):
    sid = request.session_hash
    if sid:
        d1 = os.path.join(os.environ["PROCESSED_RESULTS"], sid)
        shutil.rmtree(d1, ignore_errors=True)
        
def start_session(request: gr.Request):
    return request.session_hash

css = """
    #col-container {
        margin: 0 auto;
        max-width: 1024px;
    }
    """

theme = gr.themes.Ocean()

with gr.Blocks(css=css, theme=theme) as demo:

    session_state = gr.State()
    demo.load(start_session, outputs=[session_state])

    with gr.Column(elem_id="col-container"):
        gr.HTML(
            """
            <div style="text-align: center;">
                <p style="font-size:26px; display: inline; margin: 0;">
                    <strong>🎥 Ovi</strong> – Twin Backbone Cross-Modal Fusion for Audio-Video Generation
                </p>
                <a href="https://huggingface.co/chetwinlow1/Ovi" style="display: inline-block; vertical-align: middle; margin-left: 0.5em;">
                    [model]
                </a>
            </div>
            <div style="text-align: center;">
                <strong>HF Space by:</strong>
                <a href="https://twitter.com/alexandernasa/" style="display: inline-block; vertical-align: middle; margin-left: 0.5em;">
                    <img src="https://img.shields.io/twitter/url/https/twitter.com/cloudposse.svg?style=social&label=Follow Me" alt="GitHub Repo">
                </a>
            </div>
            """
        )
        with gr.Row():
            with gr.Column():
                image = gr.Image(type="filepath", label="Image", height=360)

                video_text_prompt = gr.Textbox(label="Scene Prompt", 
                                               lines=5,
                                               value="A person in a scene that their mouth is slightly open as they speak, <S>Enjoy this moment<E> and as they roll their eyes. <AUDCAP>Clear voice, faint ambient outdoor sounds.<ENDAUDCAP>",
                                               placeholder="Describe your video...")
                sample_steps = gr.Slider(
                    value=50,
                    label="Generation Steps",
                    minimum=20,
                    maximum=100,
                    step=1.0
                )
                run_btn = gr.Button("Action 🎬", variant="primary")

                gr.Markdown(
                    """
                    💡 **Prompt Guidelines**  
                    ```
                    Describe the Scene and Character(s) performance
                    <S>Dialogue line<E> (repeat as needed)  
                    <AUDCAP>character voice & atmosphere of the scene<ENDAUDCAP>
                    ```
                    """,
                    elem_classes="guideline-bubble"
                )

                with gr.Accordion("🎬 Video Generation Options", open=False, visible=False):
                    video_height = gr.Number(minimum=128, maximum=1280, value=512, step=32, label="Video Height")
                    video_width = gr.Number(minimum=128, maximum=1280, value=992, step=32, label="Video Width")

                    video_seed = gr.Number(minimum=0, maximum=100000, value=100, label="Video Seed")
                    solver_name = gr.Dropdown(
                        choices=["unipc", "euler", "dpm++"], value="unipc", label="Solver Name"
                    )

                    shift = gr.Slider(minimum=0.0, maximum=20.0, value=5.0, step=1.0, label="Shift")
                    video_guidance_scale = gr.Slider(minimum=0.0, maximum=10.0, value=4.0, step=0.5, label="Video Guidance Scale")
                    audio_guidance_scale = gr.Slider(minimum=0.0, maximum=10.0, value=3.0, step=0.5, label="Audio Guidance Scale")
                    slg_layer = gr.Number(minimum=-1, maximum=30, value=11, step=1, label="SLG Layer")
                    video_negative_prompt = gr.Textbox(label="Video Negative Prompt", placeholder="Things to avoid in video")
                    audio_negative_prompt = gr.Textbox(label="Audio Negative Prompt", placeholder="Things to avoid in audio")

            with gr.Column():
                output_path = gr.Video(label="Generated Video", height=360)

                gr.Examples(
                    examples=[
                        [
                            "The video opens with a close-up of a woman with vibrant reddish-orange, shoulder-length hair and heavy dark eye makeup. She is wearing a dark brown leather jacket over a grey hooded top. She looks intently to her right, her mouth slightly agape, and her expression is serious and focused. The background shows a room with light green walls and dark wooden cabinets on the left, and a green plant on the right. She speaks, her voice clear and direct, saying, <S>doing<E>. She then pauses briefly, her gaze unwavering, and continues, <S>And I need you to trust them.<E>. Her mouth remains slightly open, indicating she is either about to speak more or has just finished a sentence, with a look of intense sincerity.. <AUDCAP>Tense, dramatic background music, clear female voice.<ENDAUDCAP>", 
                            "example_prompts/pngs/8.png",
                            50,
                        ],
                        [
                            "A young woman with long, wavy blonde hair and light-colored eyes is shown in a medium shot against a blurred backdrop of lush green foliage. She wears a denim jacket over a striped top. Initially, her eyes are closed and her mouth is slightly open as she speaks, <S>Enjoy this moment<E>. Her eyes then slowly open, looking slightly upwards and to the right, as her expression shifts to one of thoughtful contemplation. She continues to speak, <S>No matter where it's taking<E>, her gaze then settling with a serious and focused look towards someone off-screen to her right.. <AUDCAP>Clear female voice, faint ambient outdoor sounds.<ENDAUDCAP>",
                            "example_prompts/pngs/2.png",
                            50,
                        ],
                        [
                            "A bearded man wearing large dark sunglasses and a blue patterned cardigan sits in a studio, actively speaking into a large, suspended microphone. He has headphones on and gestures with his hands, displaying rings on his fingers. Behind him, a wall is covered with red, textured sound-dampening foam on the left, and a white banner on the right features the ""CHOICE FM"" logo and various social media handles like ""@ilovechoicefm"" with ""RALEIGH"" below it. The man intently addresses the microphone, articulating, <S>is talent. It's all about authenticity. You gotta be who you really are, especially if you're working<E>. He leans forward slightly as he speaks, maintaining a serious expression behind his sunglasses.. <AUDCAP>Clear male voice speaking into a microphone, a low background hum.<ENDAUDCAP>",
                            "example_prompts/pngs/5.png",
                            50,
                        ],
                        [
                            "The video opens with a close-up on an older man with long, grey hair and a short, grey beard, wearing dark sunglasses. He is clad in a dark coat, possibly with fur trim, and black gloves. His face is angled slightly upwards and to the right, as he begins to speak, his mouth slightly open. In the immediate foreground, out of focus, is the dark-clad shoulder and the back of the head of another person. The man articulates, <S>labbra. Ti ci vorrebbe...<E> His expression remains contemplative, and he continues, seemingly completing his thought, <S>Un ego solare.<E> The background behind him is a textured, grey stone wall, suggesting an outdoor setting. The man's gaze remains fixed upwards, his expression thoughtful.. <AUDCAP>A clear, slightly low-pitched male voice speaking Italian. The overall soundscape is quiet, with no prominent background noises or music.<ENDAUDCAP>",
                            "example_prompts/pngs/7.png",
                            50,
                        ],
                        [
                            "The scene is set outdoors with a blurry, bright green background, suggesting grass and a sunny environment. On the left, a woman with long, dark hair, wearing a red top and a necklace with a white pendant, faces towards the right. Her expression is serious and slightly perturbed as she speaks, with her lips slightly pursed. She says, <S>UFO, UFC thing.<E> On the right, the back of a man's head and his right ear are visible, indicating he is facing away from the camera, listening to the woman. He has short, dark hair. The woman continues speaking, her expression remaining serious, <S>And if you're not watching that, it's one of those ancient movies from an era that's<E> as the frame holds steady on the two figures.. <AUDCAP>Clear female speech, distant low-frequency hum.<ENDAUDCAP>",
                            "example_prompts/pngs/9.png",
                            50,
                        ],
                    ],
                    inputs=[video_text_prompt, image, sample_steps],
                    outputs=[output_path],
                    fn=generate_video,
                    cache_examples=True,
                )

    run_btn.click(
        fn=generate_scene,
        inputs=[video_text_prompt, image, sample_steps, session_state],
        outputs=[output_path],
    )

if __name__ == "__main__":
    demo.unload(cleanup)
    demo.queue()
    demo.launch(ssr_mode=False, share=True)