import gradio as gr
import os
import shutil
import ffmpeg
from datetime import datetime
from pathlib import Path
import numpy as np
import cv2
import torch
#import spaces

from diffusers import AutoencoderKL, DDIMScheduler
from einops import repeat
from omegaconf import OmegaConf
from PIL import Image
from torchvision import transforms
from transformers import CLIPVisionModelWithProjection

from src.models.pose_guider import PoseGuider
from src.models.unet_2d_condition import UNet2DConditionModel
from src.models.unet_3d import UNet3DConditionModel
from src.pipelines.pipeline_pose2vid_long import Pose2VideoPipeline
from src.utils.util import get_fps, read_frames, save_videos_grid, save_pil_imgs

from src.audio_models.model import Audio2MeshModel
from src.utils.audio_util import prepare_audio_feature
from src.utils.mp_utils  import LMKExtractor
from src.utils.draw_util import FaceMeshVisualizer
from src.utils.pose_util import project_points, project_points_with_trans, matrix_to_euler_and_translation, euler_and_translation_to_matrix
from src.utils.crop_face_single import crop_face
from src.audio2vid import get_headpose_temp, smooth_pose_seq
from src.utils.frame_interpolation import init_frame_interpolation_model, batch_images_interpolation_tool

if torch.backends.mps.is_available():
  #device = "mps"
  device = "cpu"
elif torch.cuda.is_available():
  device = "cuda"
else:
  device = "cpu"


config = OmegaConf.load('./configs/prompts/animation_audio.yaml')
if config.weight_dtype == "fp16":
    weight_dtype = torch.float16
else:
    weight_dtype = torch.float32

if device == "cpu":
    weight_dtype = torch.float32
    
audio_infer_config = OmegaConf.load(config.audio_inference_config)
# prepare model
a2m_model = Audio2MeshModel(audio_infer_config['a2m_model'])
a2m_model.load_state_dict(torch.load(audio_infer_config['pretrained_model']['a2m_ckpt'], map_location="cpu"), strict=False)
a2m_model.to(device).eval()

vae = AutoencoderKL.from_pretrained(
    config.pretrained_vae_path,
).to(device, dtype=weight_dtype)

reference_unet = UNet2DConditionModel.from_pretrained(
    config.pretrained_base_model_path,
    subfolder="unet",
).to(dtype=weight_dtype, device=device)

inference_config_path = config.inference_config
infer_config = OmegaConf.load(inference_config_path)
denoising_unet = UNet3DConditionModel.from_pretrained_2d(
    config.pretrained_base_model_path,
    config.motion_module_path,
    subfolder="unet",
    unet_additional_kwargs=infer_config.unet_additional_kwargs,
).to(dtype=weight_dtype, device=device)

pose_guider = PoseGuider(noise_latent_channels=320, use_ca=True).to(device=device, dtype=weight_dtype) # not use cross attention

image_enc = CLIPVisionModelWithProjection.from_pretrained(
    config.image_encoder_path
).to(dtype=weight_dtype, device=device)

sched_kwargs = OmegaConf.to_container(infer_config.noise_scheduler_kwargs)
scheduler = DDIMScheduler(**sched_kwargs)

# load pretrained weights
denoising_unet.load_state_dict(
    torch.load(config.denoising_unet_path, map_location="cpu"),
    strict=False,
)
reference_unet.load_state_dict(
    torch.load(config.reference_unet_path, map_location="cpu"),
)
pose_guider.load_state_dict(
    torch.load(config.pose_guider_path, map_location="cpu"),
)

pipe = Pose2VideoPipeline(
    vae=vae,
    image_encoder=image_enc,
    reference_unet=reference_unet,
    denoising_unet=denoising_unet,
    pose_guider=pose_guider,
    scheduler=scheduler,
)
pipe = pipe.to(device, dtype=weight_dtype)

lmk_extractor = LMKExtractor()
vis = FaceMeshVisualizer()

frame_inter_model = init_frame_interpolation_model()

#@spaces.GPU(duration=200)
def audio2video(input_audio, ref_img, headpose_video=None, size=512, steps=25, length=150, seed=42):
    fps = 30
    cfg = 3.5

    generator = torch.manual_seed(seed)

    width, height = size, size    

    date_str = datetime.now().strftime("%Y%m%d")
    time_str = datetime.now().strftime("%H%M")
    save_dir_name = f"{time_str}--seed_{seed}-{size}x{size}"

    save_dir = Path(f"output/{date_str}/{save_dir_name}")
    save_dir.mkdir(exist_ok=True, parents=True)

    ref_image_np = cv2.cvtColor(ref_img, cv2.COLOR_RGB2BGR)
    ref_image_np = crop_face(ref_image_np, lmk_extractor)
    if ref_image_np is None:
        return None, Image.fromarray(ref_img)
    
    ref_image_np = cv2.resize(ref_image_np, (size, size))
    ref_image_pil = Image.fromarray(cv2.cvtColor(ref_image_np, cv2.COLOR_BGR2RGB))
    
    face_result = lmk_extractor(ref_image_np)
    if face_result is None: 
        return None, ref_image_pil
    
    lmks = face_result['lmks'].astype(np.float32)
    ref_pose = vis.draw_landmarks((ref_image_np.shape[1], ref_image_np.shape[0]), lmks, normed=True)
    
    sample = prepare_audio_feature(input_audio, wav2vec_model_path=audio_infer_config['a2m_model']['model_path'])
    sample['audio_feature'] = torch.from_numpy(sample['audio_feature']).float().to(device)
    sample['audio_feature'] = sample['audio_feature'].unsqueeze(0)

    # inference
    pred = a2m_model.infer(sample['audio_feature'], sample['seq_len'])
    pred = pred.squeeze().detach().cpu().numpy()
    pred = pred.reshape(pred.shape[0], -1, 3)
    pred = pred + face_result['lmks3d']
    
    if headpose_video is not None:
        pose_seq = get_headpose_temp(headpose_video)
    else:
        pose_seq = np.load(config['pose_temp'])
    mirrored_pose_seq = np.concatenate((pose_seq, pose_seq[-2:0:-1]), axis=0)
    cycled_pose_seq = np.tile(mirrored_pose_seq, (sample['seq_len'] // len(mirrored_pose_seq) + 1, 1))[:sample['seq_len']]

    # project 3D mesh to 2D landmark
    projected_vertices = project_points(pred, face_result['trans_mat'], cycled_pose_seq, [height, width])

    pose_images = []
    for i, verts in enumerate(projected_vertices):
        lmk_img = vis.draw_landmarks((width, height), verts, normed=False)
        pose_images.append(lmk_img)

    pose_list = []
    # pose_tensor_list = []

    # pose_transform = transforms.Compose(
    #     [transforms.Resize((height, width)), transforms.ToTensor()]
    # )
    args_L = len(pose_images) if length==0 or length > len(pose_images) else length
    args_L = min(args_L, 180)
    for pose_image_np in pose_images[: args_L : 2]:
        # pose_image_pil = Image.fromarray(cv2.cvtColor(pose_image_np, cv2.COLOR_BGR2RGB))
        # pose_tensor_list.append(pose_transform(pose_image_pil))
        pose_image_np = cv2.resize(pose_image_np,  (width, height))
        pose_list.append(pose_image_np)
    
    pose_list = np.array(pose_list)
    
    video_length = len(pose_list)

    video = pipe(
        ref_image_pil,
        pose_list,
        ref_pose,
        width,
        height,
        video_length,
        steps,
        cfg,
        generator=generator,
    ).videos

    # save_path = f"{save_dir}/{size}x{size}_{time_str}_noaudio.mp4"
    # save_videos_grid(
    #     video,
    #     save_path,
    #     n_rows=1,
    #     fps=fps,
    # )
    
    save_path = f"{save_dir}/{size}x{size}_{time_str}_noaudio"
    save_pil_imgs(video, save_path)
    
    save_path = batch_images_interpolation_tool(save_path, frame_inter_model, int(fps))
    
    stream = ffmpeg.input(save_path)
    audio = ffmpeg.input(input_audio)
    ffmpeg.output(stream.video, audio.audio, save_path.replace('_noaudio.mp4', '.mp4'), vcodec='copy', acodec='aac', shortest=None).run()
    os.remove(save_path)
    
    return save_path.replace('_noaudio.mp4', '.mp4'), ref_image_pil

#@spaces.GPU(duration=200)
def video2video(ref_img, source_video, size=512, steps=25, length=150, seed=42):
    cfg = 3.5
    
    generator = torch.manual_seed(seed)

    width, height = size, size

    date_str = datetime.now().strftime("%Y%m%d")
    time_str = datetime.now().strftime("%H%M")
    save_dir_name = f"{time_str}--seed_{seed}-{size}x{size}"

    save_dir = Path(f"output/{date_str}/{save_dir_name}")
    save_dir.mkdir(exist_ok=True, parents=True)
    
    ref_image_np = cv2.cvtColor(ref_img, cv2.COLOR_RGB2BGR)
    ref_image_np = crop_face(ref_image_np, lmk_extractor)
    if ref_image_np is None:
        return None, Image.fromarray(ref_img)
    
    ref_image_np = cv2.resize(ref_image_np, (size, size))
    ref_image_pil = Image.fromarray(cv2.cvtColor(ref_image_np, cv2.COLOR_BGR2RGB))
    
    face_result = lmk_extractor(ref_image_np)
    if face_result is None: 
        return None, ref_image_pil
    
    lmks = face_result['lmks'].astype(np.float32)
    ref_pose = vis.draw_landmarks((ref_image_np.shape[1], ref_image_np.shape[0]), lmks, normed=True)

    source_images = read_frames(source_video)
    src_fps = get_fps(source_video)
    pose_transform = transforms.Compose(
        [transforms.Resize((height, width)), transforms.ToTensor()]
    )
    
    step = 1
    if src_fps == 60:
        src_fps = 30
        step = 2
    
    pose_trans_list = []
    verts_list = []
    bs_list = []
    src_tensor_list = []
    args_L = len(source_images) if length==0 or length*step > len(source_images) else length*step
    args_L = min(args_L, 180*step)
    for src_image_pil in source_images[: args_L : step*2]:
        src_tensor_list.append(pose_transform(src_image_pil))
        src_img_np = cv2.cvtColor(np.array(src_image_pil), cv2.COLOR_RGB2BGR)
        frame_height, frame_width, _ = src_img_np.shape
        src_img_result = lmk_extractor(src_img_np)
        if src_img_result is None:
            break
        pose_trans_list.append(src_img_result['trans_mat'])
        verts_list.append(src_img_result['lmks3d'])
        bs_list.append(src_img_result['bs'])

    trans_mat_arr = np.array(pose_trans_list)
    verts_arr = np.array(verts_list)
    bs_arr = np.array(bs_list)
    min_bs_idx = np.argmin(bs_arr.sum(1))
    
    # compute delta pose
    pose_arr = np.zeros([trans_mat_arr.shape[0], 6])

    for i in range(pose_arr.shape[0]):
        euler_angles, translation_vector = matrix_to_euler_and_translation(trans_mat_arr[i]) # real pose of source
        pose_arr[i, :3] =  euler_angles
        pose_arr[i, 3:6] =  translation_vector
    
    init_tran_vec = face_result['trans_mat'][:3, 3] # init translation of tgt
    pose_arr[:, 3:6] = pose_arr[:, 3:6] - pose_arr[0, 3:6] + init_tran_vec # (relative translation of source) + (init translation of tgt)

    pose_arr_smooth = smooth_pose_seq(pose_arr, window_size=3)
    pose_mat_smooth = [euler_and_translation_to_matrix(pose_arr_smooth[i][:3], pose_arr_smooth[i][3:6]) for i in range(pose_arr_smooth.shape[0])]    
    pose_mat_smooth = np.array(pose_mat_smooth)   

    # face retarget
    verts_arr = verts_arr - verts_arr[min_bs_idx] + face_result['lmks3d']
    # project 3D mesh to 2D landmark
    projected_vertices = project_points_with_trans(verts_arr, pose_mat_smooth, [frame_height, frame_width])
    
    pose_list = []
    for i, verts in enumerate(projected_vertices):
        lmk_img = vis.draw_landmarks((frame_width, frame_height), verts, normed=False)
        pose_image_np = cv2.resize(lmk_img,  (width, height))
        pose_list.append(pose_image_np)
    
    pose_list = np.array(pose_list)
    
    video_length = len(pose_list)

    video = pipe(
        ref_image_pil,
        pose_list,
        ref_pose,
        width,
        height,
        video_length,
        steps,
        cfg,
        generator=generator,
    ).videos

    # save_path = f"{save_dir}/{size}x{size}_{time_str}_noaudio.mp4"
    # save_videos_grid(
    #     video,
    #     save_path,
    #     n_rows=1,
    #     fps=src_fps,
    # )
    
    save_path = f"{save_dir}/{size}x{size}_{time_str}_noaudio"
    save_pil_imgs(video, save_path)
    
    save_path = batch_images_interpolation_tool(save_path, frame_inter_model, int(src_fps))
    
    audio_output = f'{save_dir}/audio_from_video.aac'
    # extract audio
    try:
        ffmpeg.input(source_video).output(audio_output, acodec='copy').run()
        # merge audio and video
        stream = ffmpeg.input(save_path)
        audio = ffmpeg.input(audio_output)
        ffmpeg.output(stream.video, audio.audio, save_path.replace('_noaudio.mp4', '.mp4'), vcodec='copy', acodec='aac', shortest=None).run()
    
        os.remove(save_path)
        os.remove(audio_output)
    except:
        shutil.move(
            save_path,
            save_path.replace('_noaudio.mp4', '.mp4')
        )
    
    return save_path.replace('_noaudio.mp4', '.mp4'), ref_image_pil


################# GUI ################

title = r"""
<h1>AniPortrait</h1>
"""

description = r"""
<b>Official 🤗 Gradio demo</b> for <a href='https://github.com/Zejun-Yang/AniPortrait' target='_blank'><b>AniPortrait: Audio-Driven Synthesis of Photorealistic Portrait Animations</b></a>.<br>
"""

tips = r"""
When the video cannot be displayed, you can download the result video. 
"""

with gr.Blocks() as demo:
    
    gr.Markdown(title)
    gr.Markdown(description)
    gr.Markdown(tips)
    
    with gr.Tab("Audio2video"):
        with gr.Row():
            with gr.Column():
                with gr.Row():
                    a2v_input_audio = gr.Audio(sources=["upload", "microphone"], type="filepath", editable=True, label="Input audio", interactive=True)
                    a2v_ref_img = gr.Image(label="Upload reference image", sources="upload")
                    a2v_headpose_video = gr.Video(label="Option: upload head pose reference video", sources="upload")

                with gr.Row():
                    if device == "cpu":
                        a2v_size_slider = gr.Slider(minimum=256, maximum=1024, step=8, value=256, label="Video size (-W & -H)")
                    else:
                        a2v_size_slider = gr.Slider(minimum=256, maximum=1024, step=8, value=512, label="Video size (-W & -H)")
                    a2v_step_slider = gr.Slider(minimum=5, maximum=50, step=1, value=20, label="Steps (--steps)")
                
                with gr.Row():
                    a2v_length = gr.Slider(minimum=0, maximum=180, step=1, value=60, label="Length (-L) (Set 0 to automatically calculate video length.)")
                    a2v_seed = gr.Number(value=42, label="Seed (--seed)")
                
                a2v_botton = gr.Button("Generate", variant="primary")
            a2v_output_video = gr.PlayableVideo(label="Result", interactive=False)
        
        gr.Examples(
            examples=[
                ["configs/inference/audio/lyl.wav", "configs/inference/ref_images/Aragaki.png", None],
                ["configs/inference/audio/lyl.wav", "configs/inference/ref_images/solo.png", None],
                ["configs/inference/audio/lyl.wav", "configs/inference/ref_images/lyl.png", "configs/inference/head_pose_temp/pose_ref_video.mp4"],
                ],
            inputs=[a2v_input_audio, a2v_ref_img, a2v_headpose_video],
        )
            
    
    with gr.Tab("Video2video"):
        with gr.Row():
            with gr.Column():
                with gr.Row():
                    v2v_ref_img = gr.Image(label="Upload reference image", sources="upload")
                    v2v_source_video = gr.Video(label="Upload source video", sources="upload")
                
                with gr.Row():
                    if device == "cpu":
                        v2v_size_slider = gr.Slider(minimum=256, maximum=1024, step=8, value=256, label="Video size (-W & -H)")
                    else:
                        v2v_size_slider = gr.Slider(minimum=256, maximum=1024, step=8, value=512, label="Video size (-W & -H)")
                    v2v_step_slider = gr.Slider(minimum=5, maximum=50, step=1, value=20, label="Steps (--steps)")
                
                with gr.Row():
                    v2v_length = gr.Slider(minimum=0, maximum=180, step=1, value=60, label="Length (-L) (Set 0 to automatically calculate video length.)")
                    v2v_seed = gr.Number(value=42, label="Seed (--seed)")
                
                v2v_botton = gr.Button("Generate", variant="primary")
            v2v_output_video = gr.PlayableVideo(label="Result", interactive=False)
            
        gr.Examples(
            examples=[
                ["configs/inference/ref_images/Aragaki.png", "configs/inference/video/Aragaki_song.mp4"],
                ["configs/inference/ref_images/solo.png", "configs/inference/video/Aragaki_song.mp4"],
                ["configs/inference/ref_images/lyl.png", "configs/inference/head_pose_temp/pose_ref_video.mp4"],
                ],
            inputs=[v2v_ref_img, v2v_source_video, a2v_headpose_video],
        )
            
    a2v_botton.click(
        fn=audio2video,
        inputs=[a2v_input_audio, a2v_ref_img, a2v_headpose_video,
                a2v_size_slider, a2v_step_slider, a2v_length, a2v_seed], 
        outputs=[a2v_output_video, a2v_ref_img]
    )
    v2v_botton.click(
        fn=video2video,
        inputs=[v2v_ref_img, v2v_source_video,
                v2v_size_slider, v2v_step_slider, v2v_length, v2v_seed], 
        outputs=[v2v_output_video, v2v_ref_img]
    )
    
demo.launch()