""" Unit Tests for Py-ART's io/sigmet.py module. """

import numpy as np
from numpy.testing import assert_almost_equal
from numpy.ma.core import MaskedArray

import pyart

############################################
# read_rsl tests (verify radar attributes) #
############################################

# read in the sample file and create a a Radar object
radar = pyart.io.read_sigmet(pyart.testing.SIGMET_PPI_FILE)


# time attribute
def test_time():
    assert 'comment' in radar.time.keys()
    assert 'long_name' in radar.time.keys()
    assert 'standard_name' in radar.time.keys()
    assert 'units' in radar.time.keys()
    assert 'calendar' in radar.time.keys()
    assert 'data' in radar.time.keys()
    assert radar.time['units'] == 'seconds since 2011-05-20T10:54:08Z'
    assert radar.time['data'].shape == (20, )
    assert_almost_equal(radar.time['data'][1], 1, 0)


# range attribute
def test_range():
    assert 'long_name' in radar.range
    assert 'standard_name' in radar.range
    assert 'meters_to_center_of_first_gate' in radar.range
    assert 'meters_between_gates' in radar.range
    assert 'units' in radar.range
    assert 'data' in radar.range
    assert 'spacing_is_constant' in radar.range
    assert radar.range['data'].shape == (25, )
    assert_almost_equal(radar.range['data'][1], 62, 0)


# fields attribute is tested later


# metadata attribute
def test_metadata():
    assert 'instrument_name' in radar.metadata
    assert 'source' in radar.metadata


# scan_type attribute
def test_scan_type():
    assert radar.scan_type == 'ppi'


# latitude attribute
def test_latitude():
    assert 'data' in radar.latitude
    assert 'standard_name' in radar.latitude
    assert 'units' in radar.latitude
    assert radar.latitude['data'].shape == (1, )
    assert_almost_equal(radar.latitude['data'], 36, 0)


# longitude attribute
def test_longitude():
    assert 'data' in radar.longitude
    assert 'standard_name' in radar.longitude
    assert 'units' in radar.longitude
    assert radar.longitude['data'].shape == (1, )
    assert_almost_equal(radar.longitude['data'], -98, 0)


# altitude attribute
def test_altitude():
    assert 'data' in radar.altitude
    assert 'standard_name' in radar.altitude
    assert 'units' in radar.altitude
    assert 'positive' in radar.altitude
    assert radar.altitude['data'].shape == (1, )
    assert_almost_equal(radar.altitude['data'], 214, 0)


# altitude_agl attribute
def test_altitude_agl():
    assert radar.altitude_agl is None


# sweep_number attribute
def test_sweep_number():
    assert 'standard_name' in radar.sweep_number
    assert np.all(radar.sweep_number['data'] == range(1))


# sweep_mode attribute
def test_sweep_mode():
    assert 'standard_name' in radar.sweep_mode
    assert radar.sweep_mode['data'].shape == (1, )
    assert radar.sweep_mode['data'].dtype.char == 'S'
    assert np.all(radar.sweep_mode['data'] == [b'azimuth_surveillance'])


# fixed_angle attribute
def test_fixed_angle():
    assert 'standard_name' in radar.fixed_angle
    assert 'units' in radar.fixed_angle
    assert radar.fixed_angle['data'].shape == (1, )
    assert_almost_equal(radar.fixed_angle['data'][0], 0.50, 2)


# sweep_start_ray_index attribute
def test_sweep_start_ray_index():
    assert 'long_name' in radar.sweep_start_ray_index
    assert radar.sweep_start_ray_index['data'].shape == (1, )
    assert_almost_equal(radar.sweep_start_ray_index['data'][0], 0, 0)


# sweep_end_ray_index attribute
def test_sweep_end_ray_index():
    assert 'long_name' in radar.sweep_end_ray_index
    assert radar.sweep_end_ray_index['data'].shape == (1, )
    assert_almost_equal(radar.sweep_end_ray_index['data'][0], 19, 0)


# target_scan_rate attribute
def test_target_scan_rate():
    assert radar.target_scan_rate is None


# azimuth attribute
def test_azimuth():
    assert 'standard_name' in radar.azimuth
    assert 'long_name' in radar.azimuth
    assert 'units' in radar.azimuth
    assert 'axis' in radar.azimuth
    assert_almost_equal(radar.azimuth['data'][0], 0, 0)
    assert_almost_equal(radar.azimuth['data'][10], 180, 0)


# elevation attribute
def test_elevation():
    assert 'standard_name' in radar.elevation
    assert 'long_name' in radar.azimuth
    assert 'units' in radar.elevation
    assert 'axis' in radar.elevation
    assert radar.elevation['data'].shape == (20, )
    assert_almost_equal(radar.elevation['data'][0], 0.50, 2)


# scan_rate attribute
def test_scan_rate():
    assert radar.scan_rate is None


# antenna_transition attribute
def test_antenna_transition():
    assert radar.antenna_transition is None


# instrument_parameters attribute
def test_instument_parameters():
    # instrument_parameter sub-convention
    keys = ['prt', 'unambiguous_range', 'prt_mode', 'nyquist_velocity',
            'pulse_width']
    for k in keys:
        description = 'instrument_parameters: %s' % k
        check_instrument_parameter.description = description
        yield check_instrument_parameter, k


def check_instrument_parameter(param):
    assert param in radar.instrument_parameters
    param_dic = radar.instrument_parameters[param]
    assert param_dic['meta_group'] == 'instrument_parameters'


def test_prt_mode_dtype():
    assert radar.instrument_parameters['prt_mode']['data'].dtype.char == 'S'


# radar_parameters attribute
def test_radar_parameters():
    # radar_parameter sub-convention
    keys = ['radar_beam_width_h', 'radar_beam_width_v']
    for k in keys:
        description = 'radar_parameters: %s' % k
        check_radar_parameter.description = description
        yield check_radar_parameter, k


def check_radar_parameter(param):
    assert param in radar.instrument_parameters
    param_dic = radar.instrument_parameters[param]
    assert param_dic['meta_group'] == 'radar_parameters'


# radar_calibration attribute
def test_radar_calibration():
    assert radar.radar_calibration is None


# ngates attribute
def test_ngates():
    assert radar.ngates == 25


# nrays attribute
def test_nrays():
    assert radar.nrays == 20


# nsweeps attribute
def test_nsweeps():
    assert radar.nsweeps == 1


####################
# fields attribute #
####################


def test_field_dics():
    fields = ['reflectivity', ]
    for field in fields:
        description = "field : %s, dictionary" % field
        check_field_dic.description = description
        yield check_field_dic, field


def check_field_dic(field):
    """ Check that the required keys are present in a field dictionary. """
    assert 'standard_name' in radar.fields[field]
    assert 'units' in radar.fields[field]
    assert '_FillValue' in radar.fields[field]
    assert 'coordinates' in radar.fields[field]


def test_field_shapes():
    fields = ['reflectivity', ]
    for field in fields:
        description = "field : %s, shape" % field
        check_field_shape.description = description
        yield check_field_shape, field


def check_field_shape(field):
    assert radar.fields[field]['data'].shape == (20, 25)


def test_field_types():
    fields = {'reflectivity': MaskedArray, }
    for field, field_type in fields.items():
        description = "field : %s, type" % field
        check_field_type.description = description
        yield check_field_type, field, field_type


def check_field_type(field, field_type):
    assert type(radar.fields[field]['data']) is field_type


def test_field_first_points():
    # these values can be found using:
    # [round(radar.fields[f]['data'][0,0]) for f in radar.fields]
    fields = {'reflectivity': 0.0}
    for field, field_value in fields.items():
        description = "field : %s, first point" % field
        check_field_first_point.description = description
        yield check_field_first_point, field, field_value


def check_field_first_point(field, value):
    assert_almost_equal(radar.fields[field]['data'][0, 0], value, 0)


def test_nonuniform_bin_masking():
    # Check that in non-collected gates are masked for rays in which the
    # number of bins is smaller than the number of bins in the product header.
    assert radar.fields['reflectivity']['data'][19, 14] == 0.0
    assert radar.fields['reflectivity']['data'][19, 15] is np.ma.masked
    assert radar.fields['reflectivity']['data'][19, 16] is np.ma.masked
    assert radar.fields['reflectivity']['data'][19, 17] is np.ma.masked
    assert radar.fields['reflectivity']['data'][19, 18] is np.ma.masked
    assert radar.fields['reflectivity']['data'][19, 19] is np.ma.masked
    assert radar.fields['reflectivity']['data'][19, 20] is np.ma.masked
    assert radar.fields['reflectivity']['data'][19, 21] is np.ma.masked
    assert radar.fields['reflectivity']['data'][19, 22] is np.ma.masked
    assert radar.fields['reflectivity']['data'][19, 23] is np.ma.masked
    assert radar.fields['reflectivity']['data'][19, 24] is np.ma.masked


#############
# RHI tests #
#############

RADAR_RHI = pyart.io.read_sigmet(pyart.testing.SIGMET_RHI_FILE)


# nsweeps attribute
def test_rhi_nsweeps():
    assert RADAR_RHI.nsweeps == 1


# sweep_number attribute
def test_rhi_sweep_number():
    assert 'standard_name' in RADAR_RHI.sweep_number
    assert np.all(RADAR_RHI.sweep_number['data'] == range(1))


# sweep_mode attribute
def test_rhi_sweep_mode():
    assert 'standard_name' in RADAR_RHI.sweep_mode
    assert RADAR_RHI.sweep_mode['data'].shape == (1, )
    assert np.all(RADAR_RHI.sweep_mode['data'] == [b'rhi'])


# fixed_angle attribute
def test_rhi_fixed_angle():
    assert 'standard_name' in RADAR_RHI.fixed_angle
    assert 'units' in RADAR_RHI.fixed_angle
    assert RADAR_RHI.fixed_angle['data'].shape == (1, )
    assert_almost_equal(RADAR_RHI.fixed_angle['data'][0], 37.30, 2)


# sweep_start_ray_index attribute
def test_rhi_sweep_start_ray_index():
    assert 'long_name' in RADAR_RHI.sweep_start_ray_index
    assert RADAR_RHI.sweep_start_ray_index['data'].shape == (1, )
    assert_almost_equal(RADAR_RHI.sweep_start_ray_index['data'][0], 0, 0)


# sweep_end_ray_index attribute
def test_rhi_sweep_end_ray_index():
    assert 'long_name' in RADAR_RHI.sweep_end_ray_index
    assert RADAR_RHI.sweep_end_ray_index['data'].shape == (1, )
    assert_almost_equal(RADAR_RHI.sweep_end_ray_index['data'][0], 19, 0)


# azimuth attribute
def test_rhi_azimuth():
    assert 'standard_name' in RADAR_RHI.azimuth
    assert 'long_name' in RADAR_RHI.azimuth
    assert 'units' in RADAR_RHI.azimuth
    assert 'axis' in RADAR_RHI.azimuth
    assert_almost_equal(RADAR_RHI.azimuth['data'][0], 37, 0)
    assert_almost_equal(RADAR_RHI.azimuth['data'][10], 37, 0)


# elevation attribute
def test_rhi_elevation():
    assert 'standard_name' in RADAR_RHI.elevation
    assert 'long_name' in RADAR_RHI.azimuth
    assert 'units' in RADAR_RHI.elevation
    assert 'axis' in RADAR_RHI.elevation
    assert RADAR_RHI.elevation['data'].shape == (20, )
    assert_almost_equal(RADAR_RHI.elevation['data'][1], 9, 2)

#########
# 1byte #
#########


# Test 1byte sigmet format. github issue #299
def test_1byte_datatype():
    data_type = 1   # Sigmet type for for a DBT field
    data = np.ones((2, 2), dtype=np.int16) * 257
    nbins = np.ones((2,), dtype=np.int16) * 2
    result = pyart.io._sigmetfile.convert_sigmet_data(data_type, data, nbins)
    assert np.all(result == -31.5)
    assert result.shape == (2, 2)
