# Licensed under a 3-clause BSD style license - see LICENSE.rst

import json
import locale
import os
import urllib.error
from datetime import datetime

import pytest
import numpy as np

from astropy.utils import data, misc
from astropy.io import fits


def test_isiterable():
    assert misc.isiterable(2) is False
    assert misc.isiterable([2]) is True
    assert misc.isiterable([1, 2, 3]) is True
    assert misc.isiterable(np.array(2)) is False
    assert misc.isiterable(np.array([1, 2, 3])) is True


def test_signal_number_to_name_no_failure():
    # Regression test for #5340: ensure signal_number_to_name throws no
    # AttributeError (it used ".iteritems()" which was removed in Python3).
    misc.signal_number_to_name(0)


@pytest.mark.remote_data
def test_api_lookup():
    try:
        strurl = misc.find_api_page('astropy.utils.misc', 'dev', False,
                                    timeout=5)
        objurl = misc.find_api_page(misc, 'dev', False, timeout=5)
    except urllib.error.URLError:
        if os.environ.get('CI', False):
            pytest.xfail('Timed out in CI')
        else:
            raise

    assert strurl == objurl
    assert strurl == 'http://devdocs.astropy.org/utils/index.html#module-astropy.utils.misc'  # noqa

    # Try a non-dev version
    objurl = misc.find_api_page(misc, 'v3.2.1', False, timeout=3)
    assert objurl == 'https://docs.astropy.org/en/v3.2.1/utils/index.html#module-astropy.utils.misc'  # noqa


def test_skip_hidden():
    path = data.get_pkg_data_path('data')
    for root, dirs, files in os.walk(path):
        assert '.hidden_file.txt' in files
        assert 'local.dat' in files
        # break after the first level since the data dir contains some other
        # subdirectories that don't have these files
        break

    for root, dirs, files in misc.walk_skip_hidden(path):
        assert '.hidden_file.txt' not in files
        assert 'local.dat' in files
        break


def test_JsonCustomEncoder():
    from astropy import units as u
    assert json.dumps(np.arange(3), cls=misc.JsonCustomEncoder) == '[0, 1, 2]'
    assert json.dumps(1+2j, cls=misc.JsonCustomEncoder) == '[1.0, 2.0]'
    assert json.dumps(set([1, 2, 1]), cls=misc.JsonCustomEncoder) == '[1, 2]'
    assert json.dumps(b'hello world \xc3\x85',
                      cls=misc.JsonCustomEncoder) == '"hello world \\u00c5"'
    assert json.dumps({1: 2},
                      cls=misc.JsonCustomEncoder) == '{"1": 2}'  # default
    assert json.dumps({1: u.m}, cls=misc.JsonCustomEncoder) == '{"1": "m"}'
    # Quantities
    tmp = json.dumps({'a': 5*u.cm}, cls=misc.JsonCustomEncoder)
    newd = json.loads(tmp)
    tmpd = {"a": {"unit": "cm", "value": 5.0}}
    assert newd == tmpd
    tmp2 = json.dumps({'a': np.arange(2)*u.cm}, cls=misc.JsonCustomEncoder)
    newd = json.loads(tmp2)
    tmpd = {"a": {"unit": "cm", "value": [0., 1.]}}
    assert newd == tmpd
    tmp3 = json.dumps({'a': np.arange(2)*u.erg/u.s}, cls=misc.JsonCustomEncoder)
    newd = json.loads(tmp3)
    tmpd = {"a": {"unit": "erg / s", "value": [0., 1.]}}
    assert newd == tmpd


def test_JsonCustomEncoder_FITS_rec_from_files():
    with fits.open(fits.util.get_testdata_filepath('variable_length_table.fits')) as hdul:
        assert json.dumps(hdul[1].data, cls=misc.JsonCustomEncoder) == \
            "[[[45, 56], [11, 3]], [[11, 12, 13], [12, 4]]]"

    with fits.open(fits.util.get_testdata_filepath('btable.fits')) as hdul:
        assert json.dumps(hdul[1].data, cls=misc.JsonCustomEncoder) == \
            '[[1, "Sirius", -1.4500000476837158, "A1V"], ' \
             '[2, "Canopus", -0.7300000190734863, "F0Ib"], ' \
             '[3, "Rigil Kent", -0.10000000149011612, "G2V"]]'

    with fits.open(fits.util.get_testdata_filepath('table.fits')) as hdul:
        assert json.dumps(hdul[1].data, cls=misc.JsonCustomEncoder) == \
            '[["NGC1001", 11.100000381469727], ' \
             '["NGC1002", 12.300000190734863], ' \
             '["NGC1003", 15.199999809265137]]'


def test_set_locale():
    # First, test if the required locales are available
    current = locale.setlocale(locale.LC_ALL)
    try:
        locale.setlocale(locale.LC_ALL, 'en_US.utf8')
        locale.setlocale(locale.LC_ALL, 'fr_FR.utf8')
    except locale.Error as e:
        pytest.skip(f'Locale error: {e}')
    finally:
        locale.setlocale(locale.LC_ALL, current)

    date = datetime(2000, 10, 1, 0, 0, 0)
    day_mon = date.strftime('%a, %b')

    with misc._set_locale('en_US.utf8'):
        assert date.strftime('%a, %b') == 'Sun, Oct'

    with misc._set_locale('fr_FR.utf8'):
        assert date.strftime('%a, %b') == 'dim., oct.'

    # Back to original
    assert date.strftime('%a, %b') == day_mon

    with misc._set_locale(current):
        assert date.strftime('%a, %b') == day_mon


def test_dtype_bytes_or_chars():
    assert misc.dtype_bytes_or_chars(np.dtype(np.float64)) == 8
    assert misc.dtype_bytes_or_chars(np.dtype(object)) is None
    assert misc.dtype_bytes_or_chars(np.dtype(np.int32)) == 4
    assert misc.dtype_bytes_or_chars(np.array(b'12345').dtype) == 5
    assert misc.dtype_bytes_or_chars(np.array('12345').dtype) == 5