""" test parquet compat """
import datetime
from distutils.version import LooseVersion
import os
from warnings import catch_warnings

import numpy as np
import pytest

from pandas.compat import PY3
import pandas.util._test_decorators as td

import pandas as pd
from pandas.util import testing as tm

from pandas.io.parquet import (
    FastParquetImpl, PyArrowImpl, get_engine, read_parquet, to_parquet)

try:
    import pyarrow  # noqa
    _HAVE_PYARROW = True
except ImportError:
    _HAVE_PYARROW = False

try:
    import fastparquet  # noqa
    _HAVE_FASTPARQUET = True
except ImportError:
    _HAVE_FASTPARQUET = False


# setup engines & skips
@pytest.fixture(params=[
    pytest.param('fastparquet',
                 marks=pytest.mark.skipif(not _HAVE_FASTPARQUET,
                                          reason='fastparquet is '
                                                 'not installed')),
    pytest.param('pyarrow',
                 marks=pytest.mark.skipif(not _HAVE_PYARROW,
                                          reason='pyarrow is '
                                                 'not installed'))])
def engine(request):
    return request.param


@pytest.fixture
def pa():
    if not _HAVE_PYARROW:
        pytest.skip("pyarrow is not installed")
    return 'pyarrow'


@pytest.fixture
def fp():
    if not _HAVE_FASTPARQUET:
        pytest.skip("fastparquet is not installed")
    return 'fastparquet'


@pytest.fixture
def df_compat():
    return pd.DataFrame({'A': [1, 2, 3], 'B': 'foo'})


@pytest.fixture
def df_cross_compat():
    df = pd.DataFrame({'a': list('abc'),
                       'b': list(range(1, 4)),
                       # 'c': np.arange(3, 6).astype('u1'),
                       'd': np.arange(4.0, 7.0, dtype='float64'),
                       'e': [True, False, True],
                       'f': pd.date_range('20130101', periods=3),
                       # 'g': pd.date_range('20130101', periods=3,
                       #                    tz='US/Eastern'),
                       # 'h': pd.date_range('20130101', periods=3, freq='ns')
                       })
    return df


@pytest.fixture
def df_full():
    return pd.DataFrame(
        {'string': list('abc'),
         'string_with_nan': ['a', np.nan, 'c'],
         'string_with_none': ['a', None, 'c'],
         'bytes': [b'foo', b'bar', b'baz'],
         'unicode': [u'foo', u'bar', u'baz'],
         'int': list(range(1, 4)),
         'uint': np.arange(3, 6).astype('u1'),
         'float': np.arange(4.0, 7.0, dtype='float64'),
         'float_with_nan': [2., np.nan, 3.],
         'bool': [True, False, True],
         'datetime': pd.date_range('20130101', periods=3),
         'datetime_with_nat': [pd.Timestamp('20130101'),
                               pd.NaT,
                               pd.Timestamp('20130103')]})


def check_round_trip(df, engine=None, path=None,
                     write_kwargs=None, read_kwargs=None,
                     expected=None, check_names=True,
                     repeat=2):
    """Verify parquet serializer and deserializer produce the same results.

    Performs a pandas to disk and disk to pandas round trip,
    then compares the 2 resulting DataFrames to verify equality.

    Parameters
    ----------
    df: Dataframe
    engine: str, optional
        'pyarrow' or 'fastparquet'
    path: str, optional
    write_kwargs: dict of str:str, optional
    read_kwargs: dict of str:str, optional
    expected: DataFrame, optional
        Expected deserialization result, otherwise will be equal to `df`
    check_names: list of str, optional
        Closed set of column names to be compared
    repeat: int, optional
        How many times to repeat the test
    """

    write_kwargs = write_kwargs or {'compression': None}
    read_kwargs = read_kwargs or {}

    if expected is None:
        expected = df

    if engine:
        write_kwargs['engine'] = engine
        read_kwargs['engine'] = engine

    def compare(repeat):
        for _ in range(repeat):
            df.to_parquet(path, **write_kwargs)
            with catch_warnings(record=True):
                actual = read_parquet(path, **read_kwargs)
            tm.assert_frame_equal(expected, actual,
                                  check_names=check_names)

    if path is None:
        with tm.ensure_clean() as path:
            compare(repeat)
    else:
        compare(repeat)


def test_invalid_engine(df_compat):
    with pytest.raises(ValueError):
        check_round_trip(df_compat, 'foo', 'bar')


def test_options_py(df_compat, pa):
    # use the set option

    with pd.option_context('io.parquet.engine', 'pyarrow'):
        check_round_trip(df_compat)


def test_options_fp(df_compat, fp):
    # use the set option

    with pd.option_context('io.parquet.engine', 'fastparquet'):
        check_round_trip(df_compat)


def test_options_auto(df_compat, fp, pa):
    # use the set option

    with pd.option_context('io.parquet.engine', 'auto'):
        check_round_trip(df_compat)


def test_options_get_engine(fp, pa):
    assert isinstance(get_engine('pyarrow'), PyArrowImpl)
    assert isinstance(get_engine('fastparquet'), FastParquetImpl)

    with pd.option_context('io.parquet.engine', 'pyarrow'):
        assert isinstance(get_engine('auto'), PyArrowImpl)
        assert isinstance(get_engine('pyarrow'), PyArrowImpl)
        assert isinstance(get_engine('fastparquet'), FastParquetImpl)

    with pd.option_context('io.parquet.engine', 'fastparquet'):
        assert isinstance(get_engine('auto'), FastParquetImpl)
        assert isinstance(get_engine('pyarrow'), PyArrowImpl)
        assert isinstance(get_engine('fastparquet'), FastParquetImpl)

    with pd.option_context('io.parquet.engine', 'auto'):
        assert isinstance(get_engine('auto'), PyArrowImpl)
        assert isinstance(get_engine('pyarrow'), PyArrowImpl)
        assert isinstance(get_engine('fastparquet'), FastParquetImpl)


def test_cross_engine_pa_fp(df_cross_compat, pa, fp):
    # cross-compat with differing reading/writing engines

    df = df_cross_compat
    with tm.ensure_clean() as path:
        df.to_parquet(path, engine=pa, compression=None)

        result = read_parquet(path, engine=fp)
        tm.assert_frame_equal(result, df)

        result = read_parquet(path, engine=fp, columns=['a', 'd'])
        tm.assert_frame_equal(result, df[['a', 'd']])


def test_cross_engine_fp_pa(df_cross_compat, pa, fp):
    # cross-compat with differing reading/writing engines

    df = df_cross_compat
    with tm.ensure_clean() as path:
        df.to_parquet(path, engine=fp, compression=None)

        with catch_warnings(record=True):
            result = read_parquet(path, engine=pa)
            tm.assert_frame_equal(result, df)

            result = read_parquet(path, engine=pa, columns=['a', 'd'])
            tm.assert_frame_equal(result, df[['a', 'd']])


class Base(object):

    def check_error_on_write(self, df, engine, exc):
        # check that we are raising the exception on writing
        with tm.ensure_clean() as path:
            with pytest.raises(exc):
                to_parquet(df, path, engine, compression=None)


class TestBasic(Base):

    def test_error(self, engine):
        for obj in [pd.Series([1, 2, 3]), 1, 'foo', pd.Timestamp('20130101'),
                    np.array([1, 2, 3])]:
            self.check_error_on_write(obj, engine, ValueError)

    def test_columns_dtypes(self, engine):
        df = pd.DataFrame({'string': list('abc'),
                           'int': list(range(1, 4))})

        # unicode
        df.columns = [u'foo', u'bar']
        check_round_trip(df, engine)

    def test_columns_dtypes_invalid(self, engine):
        df = pd.DataFrame({'string': list('abc'),
                           'int': list(range(1, 4))})

        # numeric
        df.columns = [0, 1]
        self.check_error_on_write(df, engine, ValueError)

        if PY3:
            # bytes on PY3, on PY2 these are str
            df.columns = [b'foo', b'bar']
            self.check_error_on_write(df, engine, ValueError)

        # python object
        df.columns = [datetime.datetime(2011, 1, 1, 0, 0),
                      datetime.datetime(2011, 1, 1, 1, 1)]
        self.check_error_on_write(df, engine, ValueError)

    @pytest.mark.parametrize('compression', [None, 'gzip', 'snappy', 'brotli'])
    def test_compression(self, engine, compression):

        if compression == 'snappy':
            pytest.importorskip('snappy')

        elif compression == 'brotli':
            pytest.importorskip('brotli')

        df = pd.DataFrame({'A': [1, 2, 3]})
        check_round_trip(df, engine, write_kwargs={'compression': compression})

    def test_read_columns(self, engine):
        # GH18154
        df = pd.DataFrame({'string': list('abc'),
                           'int': list(range(1, 4))})

        expected = pd.DataFrame({'string': list('abc')})
        check_round_trip(df, engine, expected=expected,
                         read_kwargs={'columns': ['string']})

    def test_write_index(self, engine):
        check_names = engine != 'fastparquet'

        df = pd.DataFrame({'A': [1, 2, 3]})
        check_round_trip(df, engine)

        indexes = [
            [2, 3, 4],
            pd.date_range('20130101', periods=3),
            list('abc'),
            [1, 3, 4],
        ]
        # non-default index
        for index in indexes:
            df.index = index
            check_round_trip(df, engine, check_names=check_names)

        # index with meta-data
        df.index = [0, 1, 2]
        df.index.name = 'foo'
        check_round_trip(df, engine)

    def test_write_multiindex(self, pa):
        # Not suppoprted in fastparquet as of 0.1.3 or older pyarrow version
        engine = pa

        df = pd.DataFrame({'A': [1, 2, 3]})
        index = pd.MultiIndex.from_tuples([('a', 1), ('a', 2), ('b', 1)])
        df.index = index
        check_round_trip(df, engine)

    def test_write_column_multiindex(self, engine):
        # column multi-index
        mi_columns = pd.MultiIndex.from_tuples([('a', 1), ('a', 2), ('b', 1)])
        df = pd.DataFrame(np.random.randn(4, 3), columns=mi_columns)
        self.check_error_on_write(df, engine, ValueError)

    def test_multiindex_with_columns(self, pa):
        engine = pa
        dates = pd.date_range('01-Jan-2018', '01-Dec-2018', freq='MS')
        df = pd.DataFrame(np.random.randn(2 * len(dates), 3),
                          columns=list('ABC'))
        index1 = pd.MultiIndex.from_product(
            [['Level1', 'Level2'], dates],
            names=['level', 'date'])
        index2 = index1.copy(names=None)
        for index in [index1, index2]:
            df.index = index

            check_round_trip(df, engine)
            check_round_trip(df, engine, read_kwargs={'columns': ['A', 'B']},
                             expected=df[['A', 'B']])

    def test_write_ignoring_index(self, engine):
        # ENH 20768
        # Ensure index=False omits the index from the written Parquet file.
        df = pd.DataFrame({'a': [1, 2, 3], 'b': ['q', 'r', 's']})

        write_kwargs = {