import os

import numpy as np
import pytest

import asdf
from asdf import AsdfFile
from asdf.commands import main
from asdf.tests.helpers import assert_tree_match, get_file_sizes


def _test_defragment(tmpdir, codec):
    x = np.arange(0, 1000, dtype=float)

    tree = {
        "science_data": x,
        "subset": x[3:-3],
        "skipping": x[::2],
        "not_shared": np.arange(100, 0, -1, dtype=np.uint8),
    }

    path = os.path.join(str(tmpdir), "original.asdf")
    out_path = os.path.join(str(tmpdir), "original.defragment.asdf")
    ff = AsdfFile(tree)
    ff.write_to(path)
    assert len(ff.blocks) == 2

    result = main.main_from_args(["defragment", path, "-o", out_path, "-c", codec])

    assert result == 0

    files = get_file_sizes(str(tmpdir))

    assert "original.asdf" in files
    assert "original.defragment.asdf" in files

    assert files["original.defragment.asdf"] < files["original.asdf"]

    with asdf.open(os.path.join(str(tmpdir), "original.defragment.asdf")) as ff:
        assert_tree_match(ff.tree, tree)
        assert len(list(ff.blocks.internal_blocks)) == 2


def test_defragment_zlib(tmpdir):
    _test_defragment(tmpdir, "zlib")


def test_defragment_bzp2(tmpdir):
    _test_defragment(tmpdir, "bzp2")


def test_defragment_lz4(tmpdir):
    pytest.importorskip("lz4")
    _test_defragment(tmpdir, "lz4")