import os
import cv2
import sys
import torch
import os.path as osp

ROOT_DIR = os.path.dirname(os.path.dirname(os.path.abspath(__file__)))

root_path = osp.abspath(osp.join(__file__, osp.pardir, osp.pardir))
sys.path.append(root_path)
from SR_Inference.inference_sr_utils import RealEsrUpsamplerZoo


class RealEsr:

    def __init__(
        self,
        upscale=2,
        bg_upsampler_name="realesrgan",
        prefered_net_in_upsampler="RRDBNet",
    ):

        self.upscale = int(upscale)
        self.device = torch.device("cuda" if torch.cuda.is_available() else "cpu")

        # ------------------------ set up background upsampler ------------------------
        self.upsampler_zoo = RealEsrUpsamplerZoo(
            upscale=self.upscale,
            bg_upsampler_name=bg_upsampler_name,
            prefered_net_in_upsampler=prefered_net_in_upsampler,
        )
        self.bg_upsampler = self.upsampler_zoo.bg_upsampler

    def __call__(self, img):
        # ---------------- restore/enhance image using the selected RealESR model ----------------
        sr_img = self.bg_upsampler.enhance(img, outscale=self.upscale)[0]

        return sr_img


if __name__ == "__main__":

    realesr = RealEsr(
        upscale=2, bg_upsampler_name="realesrgan", prefered_net_in_upsampler="RRDBNet"
    )

    img = cv2.imread(f"{ROOT_DIR}/data/EyeDentify/Wo_SR/original/1/1/frame_01.png")
    sr_img = realesr(img=img)

    saving_dir = f"{ROOT_DIR}/rough_works/SR_imgs"
    os.makedirs(saving_dir, exist_ok=True)
    cv2.imwrite(f"{saving_dir}/sr_img.png", sr_img)