import os
import cv2
import torch
import argparse
import numpy as np
import torch.nn as nn
import torch.nn.functional as F
from skimage import img_as_ubyte
from basicsr.models.archs.restormer_arch import Restormer
import yaml

def load_img(filepath):
    return cv2.cvtColor(cv2.imread(filepath), cv2.COLOR_BGR2RGB)

def save_img(filepath, img):
    cv2.imwrite(filepath, cv2.cvtColor(img, cv2.COLOR_RGB2BGR))

def load_model(yaml_path, weight_path):
    """加载 Restormer 模型"""
    try:
        from yaml import CLoader as Loader
    except ImportError:
        from yaml import Loader

    with open(yaml_path, mode='r') as f:
        config = yaml.load(f, Loader=Loader)

    net_config = config['network_g']
    net_type = net_config.pop('type', None)
    model = Restormer(**net_config)
    checkpoint = torch.load(weight_path)
    model.load_state_dict(checkpoint['params'])
    model.cuda()
    model.eval()
    return model

def restore_image(model, input_image_path, output_image_path, factor=8):
    """用模型复原单张图片"""
    img = np.float32(load_img(input_image_path)) / 255.0
    img_t = torch.from_numpy(img).permute(2, 0, 1).unsqueeze(0).cuda()

    # pad到8的倍数
    h, w = img_t.shape[2], img_t.shape[3]
    H, W = ((h + factor) // factor) * factor, ((w + factor) // factor) * factor
    padh, padw = H - h, W - w
    if padh != 0 or padw != 0:
        img_t = F.pad(img_t, (0, padw, 0, padh), 'reflect')

    with torch.no_grad():
        restored = model(img_t)
        restored = restored[:, :, :h, :w]
        restored = torch.clamp(restored, 0, 1).cpu().permute(0, 2, 3, 1).squeeze(0).numpy()

    save_img(output_image_path, img_as_ubyte(restored))
    print(f"✅ Saved restored image to: {output_image_path}")

if __name__ == "__main__":
    parser = argparse.ArgumentParser(description="Single image restoration using Restormer")
    parser.add_argument("--input", required=True, type=str, help="Path to input image")
    parser.add_argument("--output", required=True, type=str, help="Path to save output image")
    parser.add_argument("--model", required=True, choices=['restormer.gaussian_denoise_15', 'restormer.gaussian_denoise_25', 'restormer.gaussian_denoise_50', 'restormer.real_denoise', 'restormer.derain', 'restormer.defocus_deblur', 'restormer.motion_deblur'],
                        help="Model type to use")
    args = parser.parse_args()

    # 模型配置路径（根据你本地路径修改）
    model_configs = {
        "restormer.gaussian_denoise_15": {
            "yaml": "/hdd/Restoration/Restormer/Denoising/Options/GaussianColorDenoising_RestormerSigma15.yml",
            "weights": "/hdd/Restoration/Inference/Restormer/Denoising/pretrained_models/gaussian_color_denoising_sigma15.pth"
        },
        "restormer.gaussian_denoise_25": {
            "yaml": "/hdd/Restoration/Restormer/Denoising/Options/GaussianColorDenoising_RestormerSigma25.yml",
            "weights": "/hdd/Restoration/Restormer/Denoising/pretrained_models/gaussian_color_denoising_sigma25.pth"
        },
        "restormer.gaussian_denoise_50": {
            "yaml": "/hdd/Restoration/Restormer/Denoising/Options/GaussianColorDenoising_RestormerSigma50.yml",
            "weights": "/hdd/Restoration/Restormer/Denoising/pretrained_models/gaussian_color_denoising_sigma50.pth"
        },
        "restormer.real_denoise": {
            "yaml": "/hdd/Restoration/Inference/Restormer/Denoising/Options/RealDenoising_Restormer.yml",
            "weights": "/hdd/Restoration/Inference/Restormer/Denoising/pretrained_models/real_denoising.pth"
        },
        "restormer.derain": {
            "yaml": "/hdd/Restoration/Restormer/Deraining/Options/Deraining_Restormer.yml",
            "weights": "/hdd/Restoration/Restormer/Deraining/pretrained_models/deraining.pth"
        },
        "restormer.defocus_deblur": {
            "yaml": "/hdd/Restoration/Restormer/Defocus_Deblurring/Options/DefocusDeblur_Single_8bit_Restormer.yml",
            "weights": "/hdd/Restoration/Restormer/Defocus_Deblurring/pretrained_models/single_image_defocus_deblurring.pth"
        },
        "restormer.motion_deblur": {
            "yaml": "/hdd/Restoration/Inference/Restormer/Motion_Deblurring/Options/Deblurring_Restormer.yml",
            "weights": "/hdd/Restoration/Inference/Restormer/Motion_Deblurring/pretrained_models/motion_deblurring.pth"
        }
    }

    config = model_configs[args.model]
    model = load_model(config["yaml"], config["weights"])
    restore_image(model, args.input, args.output)