#!/usr/bin/env python

from __future__ import annotations

import argparse
import functools
import os
import pathlib
import sys
from typing import Callable

import dlib
import gradio as gr
import huggingface_hub
import numpy as np
import PIL.Image
import torch
import torch.nn as nn
import torchvision.transforms as T

if os.environ.get('SYSTEM') == 'spaces':
    os.system("sed -i '10,17d' DualStyleGAN/model/stylegan/op/fused_act.py")
    os.system("sed -i '10,17d' DualStyleGAN/model/stylegan/op/upfirdn2d.py")

sys.path.insert(0, 'DualStyleGAN')

from model.dualstylegan import DualStyleGAN
from model.encoder.align_all_parallel import align_face
from model.encoder.psp import pSp

TITLE = 'williamyang1991/DualStyleGAN'
DESCRIPTION = '''This is an unofficial demo for https://github.com/williamyang1991/DualStyleGAN.

![overview](https://raw.githubusercontent.com/williamyang1991/DualStyleGAN/main/doc_images/overview.jpg)

You can select style images for each style type from the tables below.
The style image index should be in the following range:
(cartoon: 0-316, caricature: 0-198, anime: 0-173, arcane: 0-99, comic: 0-100, pixar: 0-121, slamdunk: 0-119)

Expected execution time on Hugging Face Spaces: 15s
'''
ARTICLE = '''## Style images

Note that the style images here for Arcane, comic, Pixar, and Slamdunk are the reconstructed ones, not the original ones due to copyright issues.

### Cartoon
![cartoon style images](https://raw.githubusercontent.com/williamyang1991/DualStyleGAN/main/doc_images/cartoon_overview.jpg)

### Caricature
![caricature style images](https://raw.githubusercontent.com/williamyang1991/DualStyleGAN/main/doc_images/caricature_overview.jpg)

### Anime
![anime style images](https://raw.githubusercontent.com/williamyang1991/DualStyleGAN/main/doc_images/anime_overview.jpg)

### Arcane
![arcane style images](https://raw.githubusercontent.com/williamyang1991/DualStyleGAN/main/doc_images/Reconstruction_arcane_overview.jpg)

### Comic
![comic style images](https://raw.githubusercontent.com/williamyang1991/DualStyleGAN/main/doc_images/Reconstruction_comic_overview.jpg)

### Pixar
![pixar style images](https://raw.githubusercontent.com/williamyang1991/DualStyleGAN/main/doc_images/Reconstruction_pixar_overview.jpg)

### Slamdunk
![slamdunk style images](https://raw.githubusercontent.com/williamyang1991/DualStyleGAN/main/doc_images/Reconstruction_slamdunk_overview.jpg)

<center><img src="https://visitor-badge.glitch.me/badge?page_id=hysts.dualstylegan" alt="visitor badge"/></center>
'''

TOKEN = os.environ['TOKEN']
MODEL_REPO = 'hysts/DualStyleGAN'


def parse_args() -> argparse.Namespace:
    parser = argparse.ArgumentParser()
    parser.add_argument('--device', type=str, default='cpu')
    parser.add_argument('--theme', type=str)
    parser.add_argument('--live', action='store_true')
    parser.add_argument('--share', action='store_true')
    parser.add_argument('--port', type=int)
    parser.add_argument('--disable-queue',
                        dest='enable_queue',
                        action='store_false')
    parser.add_argument('--allow-flagging', type=str, default='never')
    parser.add_argument('--allow-screenshot', action='store_true')
    return parser.parse_args()


def load_encoder(device: torch.device) -> nn.Module:
    ckpt_path = huggingface_hub.hf_hub_download(MODEL_REPO,
                                                'models/encoder.pt',
                                                use_auth_token=TOKEN)
    ckpt = torch.load(ckpt_path, map_location='cpu')
    opts = ckpt['opts']
    opts['device'] = device.type
    opts['checkpoint_path'] = ckpt_path
    opts = argparse.Namespace(**opts)
    model = pSp(opts)
    model.to(device)
    model.eval()
    return model


def load_generator(style_type: str, device: torch.device) -> nn.Module:
    model = DualStyleGAN(1024, 512, 8, 2, res_index=6)
    ckpt_path = huggingface_hub.hf_hub_download(
        MODEL_REPO, f'models/{style_type}/generator.pt', use_auth_token=TOKEN)
    ckpt = torch.load(ckpt_path, map_location='cpu')
    model.load_state_dict(ckpt['g_ema'])
    model.to(device)
    model.eval()
    return model


def load_exstylecode(style_type: str) -> dict[str, np.ndarray]:
    if style_type in ['cartoon', 'caricature', 'anime']:
        filename = 'refined_exstyle_code.npy'
    else:
        filename = 'exstyle_code.npy'
    path = huggingface_hub.hf_hub_download(MODEL_REPO,
                                           f'models/{style_type}/{filename}',
                                           use_auth_token=TOKEN)
    exstyles = np.load(path, allow_pickle=True).item()
    return exstyles


def create_transform() -> Callable:
    transform = T.Compose([
        T.Resize(256),
        T.CenterCrop(256),
        T.ToTensor(),
        T.Normalize([0.5, 0.5, 0.5], [0.5, 0.5, 0.5]),
    ])
    return transform


def create_dlib_landmark_model():
    path = huggingface_hub.hf_hub_download(
        'hysts/dlib_face_landmark_model',
        'shape_predictor_68_face_landmarks.dat',
        use_auth_token=TOKEN)
    return dlib.shape_predictor(path)


def denormalize(tensor: torch.Tensor) -> torch.Tensor:
    return torch.clamp((tensor + 1) / 2 * 255, 0, 255).to(torch.uint8)


def postprocess(tensor: torch.Tensor) -> PIL.Image.Image:
    tensor = denormalize(tensor)
    image = tensor.cpu().numpy().transpose(1, 2, 0)
    return PIL.Image.fromarray(image)


@torch.inference_mode()
def run(
    image,
    style_type: str,
    style_id: float,
    structure_weight: float,
    color_weight: float,
    dlib_landmark_model,
    encoder: nn.Module,
    generator_dict: dict[str, nn.Module],
    exstyle_dict: dict[str, dict[str, np.ndarray]],
    transform: Callable,
    device: torch.device,
) -> tuple[PIL.Image.Image, PIL.Image.Image, PIL.Image.Image, PIL.Image.Image,
           PIL.Image.Image]:
    generator = generator_dict[style_type]
    exstyles = exstyle_dict[style_type]

    style_id = int(style_id)
    style_id = min(max(0, style_id), len(exstyles) - 1)

    stylename = list(exstyles.keys())[style_id]

    image = align_face(filepath=image.name, predictor=dlib_landmark_model)
    input_data = transform(image).unsqueeze(0).to(device)

    img_rec, instyle = encoder(input_data,
                               randomize_noise=False,
                               return_latents=True,
                               z_plus_latent=True,
                               return_z_plus_latent=True,
                               resize=False)
    img_rec = torch.clamp(img_rec.detach(), -1, 1)

    latent = torch.tensor(exstyles[stylename]).repeat(2, 1, 1).to(device)
    # latent[0] for both color and structrue transfer and latent[1] for only structrue transfer
    latent[1, 7:18] = instyle[0, 7:18]
    exstyle = generator.generator.style(
        latent.reshape(latent.shape[0] * latent.shape[1],
                       latent.shape[2])).reshape(latent.shape)

    img_gen, _ = generator([instyle.repeat(2, 1, 1)],
                           exstyle,
                           z_plus_latent=True,
                           truncation=0.7,
                           truncation_latent=0,
                           use_res=True,
                           interp_weights=[structure_weight] * 7 +
                           [color_weight] * 11)
    img_gen = torch.clamp(img_gen.detach(), -1, 1)
    # deactivate color-related layers by setting w_c = 0
    img_gen2, _ = generator([instyle],
                            exstyle[0:1],
                            z_plus_latent=True,
                            truncation=0.7,
                            truncation_latent=0,
                            use_res=True,
                            interp_weights=[structure_weight] * 7 + [0] * 11)
    img_gen2 = torch.clamp(img_gen2.detach(), -1, 1)

    img_rec = postprocess(img_rec[0])
    img_gen0 = postprocess(img_gen[0])
    img_gen1 = postprocess(img_gen[1])
    img_gen2 = postprocess(img_gen2[0])

    return image, img_rec, img_gen0, img_gen1, img_gen2


def main():
    args = parse_args()
    device = torch.device(args.device)

    style_types = [
        'cartoon',
        'caricature',
        'anime',
        'arcane',
        'comic',
        'pixar',
        'slamdunk',
    ]
    generator_dict = {
        style_type: load_generator(style_type, device)
        for style_type in style_types
    }
    exstyle_dict = {
        style_type: load_exstylecode(style_type)
        for style_type in style_types
    }

    dlib_landmark_model = create_dlib_landmark_model()
    encoder = load_encoder(device)
    transform = create_transform()

    func = functools.partial(run,
                             dlib_landmark_model=dlib_landmark_model,
                             encoder=encoder,
                             generator_dict=generator_dict,
                             exstyle_dict=exstyle_dict,
                             transform=transform,
                             device=device)
    func = functools.update_wrapper(func, run)

    image_paths = sorted(pathlib.Path('images').glob('*.jpg'))
    examples = [[path.as_posix(), 'cartoon', 26, 0.6, 1.0]
                for path in image_paths]

    gr.Interface(
        func,
        [
            gr.inputs.Image(type='file', label='Input Image'),
            gr.inputs.Radio(style_types,
                            type='value',
                            default='cartoon',
                            label='Style Type'),
            gr.inputs.Number(default=26, label='Style Image Index'),
            gr.inputs.Slider(
                0, 1, step=0.1, default=0.6, label='Structure Weight'),
            gr.inputs.Slider(0, 1, step=0.1, default=1.0,
                             label='Color Weight'),
        ],
        [
            gr.outputs.Image(type='pil', label='Aligned Face'),
            gr.outputs.Image(type='pil', label='Reconstructed'),
            gr.outputs.Image(type='pil',
                             label='Result 1 (Color and structure transfer)'),
            gr.outputs.Image(type='pil',
                             label='Result 2 (Structure transfer only)'),
            gr.outputs.Image(
                type='pil',
                label='Result 3 (Color-related layers deactivated)'),
        ],
        examples=examples,
        title=TITLE,
        description=DESCRIPTION,
        article=ARTICLE,
        theme=args.theme,
        allow_screenshot=args.allow_screenshot,
        allow_flagging=args.allow_flagging,
        live=args.live,
    ).launch(
        enable_queue=args.enable_queue,
        server_port=args.port,
        share=args.share,
    )


if __name__ == '__main__':
    main()