import io
from PIL import Image
from datasets import GeneratorBasedBuilder, DatasetInfo, Features, SplitGenerator, Value, Array2D, Split
import datasets
import OpenEXR
import Imath
import numpy as np
import h5py
class RGBSemanticDepthDataset(GeneratorBasedBuilder):
    def _info(self):
        return DatasetInfo(
            features=Features({
                "left_rgb": datasets.Image(),
                "right_rgb": datasets.Image(),
                "left_seg": datasets.Image(),
                "left_depth": datasets.Image(),
                "right_depth": datasets.Image(),
            })
        )
    def _h5_loader(self, bytes_stream):
        # Reference: https://github.com/dwofk/fast-depth/blob/master/dataloaders/dataloader.py#L8-L13
        f = io.BytesIO(bytes_stream)
        h5f = h5py.File(f, "r")
        left_rgb = self._read_jpg(h5f['rgb_left'])
        right_rgb = self._read_jpg(h5f['rgb_right'])
        left_seg = h5f['seg_left']
        left_depth = h5f['depth_left'].astype(np.float32)
        right_depth = h5f['depth_right'].astype(np.float32)
        print(left_rgb.shape, left_depth.shape, left_seg.shape)
        return left_rgb, right_rgb, left_seg, left_depth, right_depth
    def _read_jpg(self, bytes_stream):
        return Image.open(io.BytesIO(bytes_stream))
    
    def _split_generators(self, dl_manager):
        archives = dl_manager.download({"train":["data/images_1729368304.063240.tar"]})
        return [
            SplitGenerator(
                name=Split.TRAIN,
                gen_kwargs={
                    "archives": [dl_manager.iter_archive(archive) for archive in archives["train"]],
                },
            ),
        ]

    def _generate_examples(self, archives):
        for archive in archives:
            for path, file in archive:
                print(path)
                left_rgb, right_rgb, left_seg, left_depth, right_depth = self._h5_loader(file.read())
                yield path, {
                    "left_rgb": left_rgb,
                    "right_rgb": right_rgb,
                    "left_seg": left_seg,
                    "left_depth": left_depth,
                    "right_depth": right_depth,
                }