# -*- coding: utf-8 -*-


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

import pytest
import numpy as np

from astropy.utils.data_info import dtype_info_name
from astropy.table import QTable
from astropy.table.index import SlicedIndex
from astropy.time import Time
from astropy.coordinates import SkyCoord
import astropy.units as u


STRING_TYPE_NAMES = {(True, 'S'): 'bytes',
                     (True, 'U'): 'str'}

DTYPE_TESTS = ((np.array(b'abcd').dtype, STRING_TYPE_NAMES[(True, 'S')] + '4'),
               (np.array('abcd').dtype, STRING_TYPE_NAMES[(True, 'U')] + '4'),
               ('S4', STRING_TYPE_NAMES[(True, 'S')] + '4'),
               ('U4', STRING_TYPE_NAMES[(True, 'U')] + '4'),
               (np.void, 'void'),
               (np.int32, 'int32'),
               (bool, 'bool'),
               (float, 'float64'),
               ('<f4', 'float32'),
               ('u8', 'uint64'),
               ('c16', 'complex128'),
               ('object', 'object'))


@pytest.mark.parametrize('input,output', DTYPE_TESTS)
def test_dtype_info_name(input, output):
    """
    Test that dtype_info_name is giving the expected output

    Here the available types::

      'b' boolean
      'i' (signed) integer
      'u' unsigned integer
      'f' floating-point
      'c' complex-floating point
      'O' (Python) objects
      'S', 'a' (byte-)string
      'U' Unicode
      'V' raw data (void)
    """
    assert dtype_info_name(input) == output


def test_info_no_copy_numpy():
    """Test that getting a single item from Table column object does not copy info.
    See #10889.
    """
    col = [1, 2]
    t = QTable([col], names=['col'])
    t.add_index('col')
    val = t['col'][0]
    # Returns a numpy scalar (e.g. np.float64) with no .info
    assert isinstance(val, np.number)
    with pytest.raises(AttributeError):
        val.info
    val = t['col'][:]
    assert val.info.indices == []


cols = [[1, 2] * u.m,
        Time([1, 2], format='cxcsec')]


@pytest.mark.parametrize('col', cols)
def test_info_no_copy_mixin_with_index(col):
    """Test that getting a single item from Table column object does not copy info.
    See #10889.
    """
    t = QTable([col], names=['col'])
    t.add_index('col')
    val = t['col'][0]
    assert 'info' not in val.__dict__
    assert val.info.indices == []
    val = t['col'][:]
    assert 'info' in val.__dict__
    assert val.info.indices == []
    val = t[:]['col']
    assert 'info' in val.__dict__
    assert isinstance(val.info.indices[0], SlicedIndex)


def test_info_no_copy_skycoord():
    """Test that getting a single item from Table SkyCoord column object does
    not copy info.  Cannot create an index on a SkyCoord currently.
    """
    col = SkyCoord([1, 2], [1, 2], unit='deg'),
    t = QTable([col], names=['col'])
    val = t['col'][0]
    assert 'info' not in val.__dict__
    assert val.info.indices == []
    val = t['col'][:]
    assert val.info.indices == []
    val = t[:]['col']
    assert val.info.indices == []