import socket
from unittest import mock
from http.client import RemoteDisconnected
from urllib.error import URLError

import pytest

import sunpy.net.dataretriever.sources.rhessi as rhessi
from sunpy.net import Fido
from sunpy.net import attrs as a
from sunpy.net.dataretriever.client import QueryResponse
from sunpy.net.fido_factory import UnifiedResponse
from sunpy.tests.helpers import no_vso
from sunpy.time import TimeRange, parse_time


@pytest.fixture
def LCClient():
    return rhessi.RHESSIClient()


@pytest.fixture
def one_day_timerange():
    return TimeRange(("2016/01/15", "2016/01/16"))


@pytest.fixture
def two_days_timerange():
    return TimeRange(("2016/01/15", "2016/01/17"))


def test_get_observing_summary_dbase_file_with_unsupported_start_time(LCClient):
    """
    RHESSI summary files are not available for before 2002-02-01, ensure
    `ValueError` is raised.
    """
    with pytest.raises(ValueError):
        LCClient.get_observing_summary_dbase_file("2002/01/21")


@mock.patch('sunpy.net.dataretriever.sources.rhessi.urlretrieve', return_value=None)
@mock.patch('sunpy.net.dataretriever.sources.rhessi.get_base_url', return_value='http://www.example.com/')
def test_get_observing_summary_dbase_file_build_correct_url(mock_get_base_url, mock_urlretrieve,
                                                            one_day_timerange, LCClient):
    """
    This test ensures that we build the correct url which is then used
    to get the database file.
    """
    LCClient.get_observing_summary_dbase_file(one_day_timerange.start)
    mock_urlretrieve.assert_called_with(
        'http://www.example.com/dbase/hsi_obssumm_filedb_201601.txt')


@mock.patch('sunpy.net.dataretriever.sources.rhessi.urlopen', return_value=None)
def test_get_base_url(mock_urlopen):
    """
    Success case, can successfully 'ping' first data_server
    """
    assert rhessi.get_base_url() == rhessi.data_servers[0]


@mock.patch('sunpy.net.dataretriever.sources.rhessi.urlopen', side_effect=URLError(''))
def test_get_base_url_on_urlerror(mock_urlopen):
    """
    If all tested URLs raise `URLError`, then raise an `IOError`
    """
    with pytest.raises(OSError):
        rhessi.get_base_url()


@mock.patch('sunpy.net.dataretriever.sources.rhessi.urlopen', side_effect=socket.timeout)
def test_get_base_url_on_timeout(mock_urlopen):
    """
    If all tested data servers timeout, then raise an `IOError`
    """
    with pytest.raises(OSError):
        rhessi.get_base_url()


@mock.patch('sunpy.net.dataretriever.sources.rhessi.urlopen', side_effect=RemoteDisconnected(''))
def test_get_base_url_on_remote_disconnected(mock_urlopen):
    """
    If all tested data servers timeout, then raise an `IOError`
    """
    with pytest.raises(OSError):
        rhessi.get_base_url()


def parsed_dbase():
    """
    The result of calling `parse_observing_summary_dbase_file(...)` on
    https://hesperia.gsfc.nasa.gov/hessidata/dbase/hsi_obssumm_filedb_200311.txt but
    only using the first two rows of data.
    """

    return {'filename': ['hsi_obssumm_20031101_157.fit',
                         'hsi_obssumm_20031102_161.fit',
                         'hsi_obssumm_20031103_165.fit',
                         'hsi_obssumm_20031104_168.fit',
                         'hsi_obssumm_20031105_156.fit'],
            'orb_st': [65536, 65536, 65536, 65536, 65536],
            'orb_end': [65536, 65536, 65536, 65536, 65536],
            'start_time': [parse_time('2003-11-01T00:00:00.000'),
                           parse_time('2003-11-02T00:00:00.000'),
                           parse_time('2003-11-03T00:00:00.000'),
                           parse_time('2003-11-04T00:00:00.000'),
                           parse_time('2003-11-05T00:00:00.000')],
            'end_time': [parse_time('2003-11-02T00:00:00.000'),
                         parse_time('2003-11-03T00:00:00.000'),
                         parse_time('2003-11-04T00:00:00.000'),
                         parse_time('2003-11-05T00:00:00.000'),
                         parse_time('2003-11-06T00:00:00.000')],
            'status_flag': [0, 0, 0, 0, 0],
            'npackets': [0, 0, 0, 0, 0]}


@mock.patch('sunpy.net.dataretriever.sources.rhessi.get_base_url', return_value='http://www.example.com/')
@mock.patch('sunpy.net.dataretriever.sources.rhessi.parse_observing_summary_dbase_file', return_value=parsed_dbase())
@mock.patch('sunpy.net.dataretriever.sources.rhessi.RHESSIClient.get_observing_summary_dbase_file', return_value=('', {}))
def test_get_observing_summary_filename_one_day(mock_get_observing_summary_dbase_file,
                                                mock_parse_observing_summary_dbase_file,
                                                mock_get_base_url, LCClient):
    """
    Given a time range of one day, make sure we get one days data back, i.e. one file.
    """
    filename = LCClient.get_observing_summary_filename(('2003-11-01', '2003-11-01T23:59:59'))
    assert len(filename) == 1
    assert filename[0] == 'http://www.example.com/metadata/catalog/hsi_obssumm_20031101_157.fits'


@mock.patch('sunpy.net.dataretriever.sources.rhessi.get_base_url', return_value='http://www.example.com/')
@mock.patch('sunpy.net.dataretriever.sources.rhessi.parse_observing_summary_dbase_file', return_value=parsed_dbase())
@mock.patch('sunpy.net.dataretriever.sources.rhessi.RHESSIClient.get_observing_summary_dbase_file', return_value=('', {}))
def test_get_observing_summary_filename_two_days(mock_get_observing_summary_dbase_file,
                                                 mock_parse_observing_summary_dbase_file,
                                                 mock_get_base_url, LCClient):
    """
    Given a time range of two days, make sure we get two files back, one
    for each day.
    """
    filenames = LCClient.get_observing_summary_filename(('2003-11-01', '2003-11-02T23:59:59'))

    assert len(filenames) == 2
    assert filenames[0] == 'http://www.example.com/metadata/catalog/hsi_obssumm_20031101_157.fits'
    assert filenames[1] == 'http://www.example.com/metadata/catalog/hsi_obssumm_20031102_161.fits'


def test_can_handle_query(LCClient):
    ans1 = LCClient._can_handle_query(
        a.Time('2012/8/9', '2012/8/9'), a.Instrument.rhessi)
    assert ans1 is True
    ans2 = LCClient._can_handle_query(a.Time('2013/2/7', '2013/2/7'))
    assert ans2 is False


@mock.patch('sunpy.net.dataretriever.sources.rhessi.get_base_url', return_value='http://www.example.com/')
@mock.patch('sunpy.net.dataretriever.sources.rhessi.parse_observing_summary_dbase_file', return_value=parsed_dbase())
@mock.patch('sunpy.net.dataretriever.sources.rhessi.RHESSIClient.get_observing_summary_dbase_file', return_value=('', {}))
def test_query(mock_get_observing_summary_dbase_file,
               mock_parse_observing_summary_dbase_file,
               mock_get_base_url, LCClient):
    qr1 = LCClient.search(a.Time('2003-11-01', '2003-11-03'), a.Instrument.rhessi)
    assert isinstance(qr1, QueryResponse)
    assert len(qr1) == 3
    assert qr1.time_range().start.datetime == parse_time('2003/11/01').datetime
    assert qr1.time_range().end.datetime == parse_time('2003/11/03T23:59:59.999').datetime


@no_vso
@mock.patch('sunpy.net.dataretriever.sources.rhessi.get_base_url', return_value='http://www.example.com/')
@mock.patch('sunpy.net.dataretriever.sources.rhessi.parse_observing_summary_dbase_file', return_value=parsed_dbase())
@mock.patch('sunpy.net.dataretriever.sources.rhessi.RHESSIClient.get_observing_summary_dbase_file', return_value=('', {}))
def test_fido_mock(mock_get_observing_summary_dbase_file,
                   mock_parse_observing_summary_dbase_file,
                   mock_get_base_url):
    qr = Fido.search(a.Time('2003-11-01', '2003-11-03'), a.Instrument.rhessi)
    assert isinstance(qr, UnifiedResponse)
    assert qr._numfile == 3


def test_attr_reg():
    assert a.Instrument.rhessi == a.Instrument('RHESSI')
    assert a.Physobs.summary_lightcurve == a.Physobs("summary_lightcurve")


def test_client_repr(LCClient):
    """
    Repr check
    """
    output = str(LCClient)
    assert output[:50] == 'sunpy.net.dataretriever.sources.rhessi.RHESSIClien'


def mock_query_object(LCClient):
    """
    Creating a Query Response object and prefilling it with some information
    """
    start = '2016/1/1'
    end = '2016/1/1 23:59:59'
    obj = {
        'Start Time': parse_time(start),
        'End Time': parse_time(end),
        'Instrument': 'RHESSI',
        'Physobs': 'irradiance',
        'Source': 'RHESSI',
        'Provider': 'NASA',
        'url': ('https://hesperia.gsfc.nasa.gov/hessidata/metadata/'
                'catalog/hsi_obssumm_20160101_078.fits')
    }
    results = QueryResponse([obj], client=LCClient)
    return results


def test_show(LCClient):
    mock_qr = mock_query_object(LCClient)
    qrshow0 = mock_qr.show()
    qrshow1 = mock_qr.show('Start Time', 'Instrument')
    allcols = {'Start Time', 'End Time', 'Instrument', 'Physobs', 'Source', 'Provider', 'url'}
    assert not allcols.difference(qrshow0.colnames)
    assert qrshow1.colnames == ['Start Time', 'Instrument']
    assert qrshow0['Instrument'][0] == 'RHESSI'
