import os

import h5py
import numpy as np
import torch

from unik3d.datasets.image_dataset import ImageDataset
from unik3d.datasets.utils import DatasetFromList


class DENSE(ImageDataset):
    CAM_INTRINSIC = {
        "ALL": torch.tensor(
            [
                [1177.8614, 0.0, 474.319027],
                [0.0, 1177.8614, 224.275919],
                [0.0, 0.0, 1.0],
            ]
        )
    }
    min_depth = 0.05
    max_depth = 80.0
    depth_scale = 255.0
    test_split = "train.txt"
    train_split = "train.txt"
    hdf5_paths = ["DENSE.hdf5"]

    def __init__(
        self,
        image_shape,
        split_file,
        test_mode,
        benchmark=False,
        augmentations_db={},
        normalize=True,
        resize_method="hard",
        mini=1.0,
        **kwargs,
    ):
        super().__init__(
            image_shape=image_shape,
            split_file=split_file,
            test_mode=test_mode,
            benchmark=benchmark,
            normalize=normalize,
            augmentations_db=augmentations_db,
            resize_method=resize_method,
            mini=mini,
            **kwargs,
        )
        self.test_mode = test_mode

        self.intrisics = {}
        self.load_dataset()

    def load_dataset(self):
        h5file = h5py.File(
            os.path.join(self.data_root, self.hdf5_paths[0]),
            "r",
            libver="latest",
            swmr=True,
        )
        txt_file = np.array(h5file[self.split_file])
        txt_string = txt_file.tostring().decode("ascii")[:-1]  # correct the -1
        h5file.close()
        dataset = []
        for line in txt_string.split("\n"):
            image_filename, depth_filename = line.strip().split(" ")
            sample = [image_filename, depth_filename]
            dataset.append(sample)

        if not self.test_mode:
            dataset = self.chunk(dataset, chunk_dim=1, pct=self.mini)

        self.dataset = DatasetFromList(dataset)
        self.log_load_dataset()

    def get_intrinsics(self, idx, image_name):
        return self.CAM_INTRINSIC["ALL"].clone()

    def get_mapper(self):
        return {
            "image_filename": 0,
            "depth_filename": 1,
        }

    def pre_pipeline(self, results):
        results = super().pre_pipeline(results)
        results["dense"] = [False] * self.num_copies
        results["quality"] = [1] * self.num_copies
        return results