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

from io import StringIO

import pytest

from astropy.io.ascii.ui import read
from astropy.io.ascii.ipac import Ipac, IpacFormatError, IpacFormatErrorDBMS
from astropy.io import ascii
from astropy.table import Table, Column
from astropy.io.ascii.core import masked

DATA = '''
|   a  |   b   |
| char | char  |
ABBBBBBABBBBBBBA
'''


def test_ipac_default():
    # default should be ignore
    table = read(DATA, Reader=Ipac)
    assert table['a'][0] == 'BBBBBB'
    assert table['b'][0] == 'BBBBBBB'


def test_ipac_ignore():
    table = read(DATA, Reader=Ipac, definition='ignore')
    assert table['a'][0] == 'BBBBBB'
    assert table['b'][0] == 'BBBBBBB'


def test_ipac_left():
    table = read(DATA, Reader=Ipac, definition='left')
    assert table['a'][0] == 'BBBBBBA'
    assert table['b'][0] == 'BBBBBBBA'


def test_ipac_right():
    table = read(DATA, Reader=Ipac, definition='right')
    assert table['a'][0] == 'ABBBBBB'
    assert table['b'][0] == 'ABBBBBBB'


def test_too_long_colname_default():
    table = Table([[3]], names=['a1234567890123456789012345678901234567890'])
    out = StringIO()
    with pytest.raises(IpacFormatError):
        ascii.write(table, out, Writer=Ipac)


def test_too_long_colname_strict():
    table = Table([[3]], names=['a1234567890123456'])
    out = StringIO()
    with pytest.raises(IpacFormatErrorDBMS):
        ascii.write(table, out, Writer=Ipac, DBMS=True)


def test_too_long_colname_notstrict():
    table = Table([[3]], names=['a1234567890123456789012345678901234567890'])
    out = StringIO()
    with pytest.raises(IpacFormatError):
        ascii.write(table, out, Writer=Ipac, DBMS=False)


@pytest.mark.parametrize(("strict_", "Err"),
                         [(True, IpacFormatErrorDBMS),
                          (False, IpacFormatError)])
def test_non_alfnum_colname(strict_, Err):
    table = Table([[3]], names=['a123456789 01234'])
    out = StringIO()
    with pytest.raises(Err):
        ascii.write(table, out, Writer=Ipac, DBMS=strict_)


def test_colname_starswithnumber_strict():
    table = Table([[3]], names=['a123456789 01234'])
    out = StringIO()
    with pytest.raises(IpacFormatErrorDBMS):
        ascii.write(table, out, Writer=Ipac, DBMS=True)


def test_double_colname_strict():
    table = Table([[3], [1]], names=['DEC', 'dec'])
    out = StringIO()
    with pytest.raises(IpacFormatErrorDBMS):
        ascii.write(table, out, Writer=Ipac, DBMS=True)


@pytest.mark.parametrize('colname', ['x', 'y', 'z', 'X', 'Y', 'Z'])
def test_reserved_colname_strict(colname):
    table = Table([['reg']], names=[colname])
    out = StringIO()
    with pytest.raises(IpacFormatErrorDBMS):
        ascii.write(table, out, Writer=Ipac, DBMS=True)


def test_too_long_comment():
    with pytest.warns(UserWarning, match=r'Comment string > 78 characters was '
                      r'automatically wrapped\.'):
        table = Table([[3]])
        table.meta['comments'] = ['a' * 79]
        out = StringIO()
        ascii.write(table, out, Writer=Ipac)

    expected_out = """\
\\ aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa
\\ a
|col0|
|long|
|    |
|null|
    3
"""
    assert out.getvalue().strip().splitlines() == expected_out.splitlines()


def test_out_with_nonstring_null():
    '''Test a (non-string) fill value.

    Even for an unmasked tables, the fill_value should show up in the
    table header.
    '''
    table = Table([[3]], masked=True)
    out = StringIO()
    ascii.write(table, out, Writer=Ipac, fill_values=[(masked, -99999)])
    expected_out = """\
|  col0|
|  long|
|      |
|-99999|
      3
"""
    assert out.getvalue().strip().splitlines() == expected_out.splitlines()


def test_include_exclude_names():
    table = Table([[1], [2], [3]], names=('A', 'B', 'C'))
    out = StringIO()
    ascii.write(table, out, Writer=Ipac, include_names=('A', 'B'), exclude_names=('A',))
    # column B should be the only included column in output
    expected_out = """\
|   B|
|long|
|    |
|null|
    2
"""
    assert out.getvalue().strip().splitlines() == expected_out.splitlines()


def test_short_dtypes():
    table = Table([Column([1.0], dtype='f4'), Column([2], dtype='i2')],
                  names=('float_col', 'int_col'))
    out = StringIO()
    ascii.write(table, out, Writer=Ipac)
    expected_out = """\
|float_col|int_col|
|    float|    int|
|         |       |
|     null|   null|
       1.0       2
"""
    assert out.getvalue().strip().splitlines() == expected_out.splitlines()