import pdb
import h5py

import pytest
from pathlib import Path
import numpy as np

from ..fixtures import tmp_output_dir, data_dir

from nwb_linkml.io.hdf5 import HDF5IO
from nwb_linkml.io.hdf5 import truncate_file


@pytest.mark.parametrize('dset', ['aibs.nwb'])
def test_hdf_read(data_dir, dset):
    NWBFILE = data_dir / dset
    io = HDF5IO(path=NWBFILE)
    # the test for now is just whether we can read it lol
    model = io.read()

def test_truncate_file(tmp_output_dir):
    source = tmp_output_dir / 'truncate_source.hdf5'

    # create a dang ol hdf5 file with a big dataset and some softlinks and make sure
    # we truncate the dataset and preserve softlink

    h5f = h5py.File(str(source), 'w')
    data_group = h5f.create_group('data')
    dataset_contig = h5f.create_dataset(
        '/data/dataset_contig',
        data=np.zeros((1000,30,40), dtype=np.float64),
        compression = "gzip",
        compression_opts = 9
    )
    dataset_chunked = h5f.create_dataset(
        '/data/dataset_chunked',
        data=np.zeros((1000, 40, 50), dtype=np.float64),
        compression="gzip",
        compression_opts=9,
        chunks=True
    )
    dataset_contig.attrs['reference_other'] = dataset_chunked.ref
    dataset_chunked.attrs['reference_other'] = dataset_contig.ref
    dataset_contig.attrs['anattr'] = 1

    link_group = h5f.create_group('link/child')
    link_group.attrs['reference_contig'] = dataset_contig.ref
    link_group.attrs['reference_chunked'] = dataset_chunked.ref
    h5f.flush()
    h5f.close()

    source_size = source.stat().st_size

    # do it without providing target to check that we make filename correctly
    n = 10
    target_output = truncate_file(source, n=n)
    assert target_output == source.parent / (source.stem + '_truncated.hdf5')
    # check that we actually made it smaller
    target_size = target_output.stat().st_size
    # empirically, the source dataset is ~125KB and truncated is ~17KB
    assert target_size < source_size / 5

    # then check that we have what's expected in the file
    target_h5f = h5py.File(target_output, 'r')

    # truncation happened
    assert target_h5f['data']['dataset_contig'].shape == (n, 30, 40)
    assert target_h5f['data']['dataset_chunked'].shape == (n, 40, 50)
    # references still work
    # can't directly assess object identity equality with "is"
    # so this tests if the referenced dereference and that they dereference to the right place
    assert target_h5f[target_h5f['data']['dataset_contig'].attrs['reference_other']].name == target_h5f['data']['dataset_chunked'].name
    assert target_h5f[target_h5f['data']['dataset_chunked'].attrs['reference_other']].name == target_h5f['data']['dataset_contig'].name
    assert target_h5f[target_h5f['link']['child'].attrs['reference_contig']].name == target_h5f['data']['dataset_contig'].name
    assert target_h5f[target_h5f['link']['child'].attrs['reference_chunked']].name == target_h5f['data']['dataset_chunked'].name
    assert target_h5f['data']['dataset_contig'].attrs['anattr'] == 1

@pytest.mark.skip()
def test_flatten_hdf():
    from nwb_linkml.io.hdf5 import HDF5IO
    from nwb_linkml.maps.hdf5 import flatten_hdf
    path = '/Users/jonny/Dropbox/lab/p2p_ld/data/nwb/sub-738651046_ses-760693773.nwb'
    import h5py
    h5f = h5py.File(path)
    flat = flatten_hdf(h5f)
    assert not any(['specifications' in v.path for v in flat.values()])
    pdb.set_trace()
    raise NotImplementedError('Just a stub for local testing for now, finish me!')