import glob
import os
import tempfile
import mapnik
import pytest

from .utilities import execution_path

default_logging_severity = mapnik.logger.get_severity()

@pytest.fixture(scope="module")
def setup():
    # All of the paths used are relative, if we run the tests
    # from another directory we need to chdir()
    os.chdir(execution_path('.'))
    yield

def compare_map(xml):
    if not os.path.exists('../data/good_maps/'):
        pytest.skip('Missing data')

    m = mapnik.Map(256, 256)
    absolute_base = os.path.abspath(os.path.dirname(xml))
    try:
        mapnik.load_map(m, xml, False, absolute_base)
    except RuntimeError as e:
        # only test datasources that we have installed
        if not 'Could not create datasource' in str(e) \
           and not 'could not connect' in str(e):
            raise RuntimeError(str(e))
        return
    (handle, test_map) = tempfile.mkstemp(
        suffix='.xml', prefix='mapnik-temp-map1-')
    os.close(handle)
    (handle, test_map2) = tempfile.mkstemp(
        suffix='.xml', prefix='mapnik-temp-map2-')
    os.close(handle)
    if os.path.exists(test_map):
        os.remove(test_map)
    mapnik.save_map(m, test_map)
    new_map = mapnik.Map(256, 256)
    mapnik.load_map(new_map, test_map, False, absolute_base)
    with open(test_map2, 'w') as f:
        f.write(mapnik.save_map_to_string(new_map))
    diff = ' diff -u %s %s' % (os.path.abspath(test_map),
                               os.path.abspath(test_map2))
    try:
        with open(test_map) as f1:
            with open(test_map2) as f2:
                assert f1.read() == f2.read()
    except AssertionError as e:
        raise AssertionError(
            'serialized map "%s" not the same after being reloaded, \ncompare with command:\n\n$%s' %
            (xml, diff))

    if os.path.exists(test_map):
        os.remove(test_map)
    else:
        # Fail, the map wasn't written
        return False


def test_compare_map(setup):
    if not os.path.exists('../data/good_maps/'):
        pytest.skip('Missing data')

    good_maps = glob.glob("../data/good_maps/*.xml")
    good_maps = [os.path.normpath(p) for p in good_maps]
    # remove one map that round trips CDATA differently, but this is okay
    ignorable = os.path.join('..', 'data', 'good_maps', 'empty_parameter2.xml')
    good_maps.remove(ignorable)
    for m in good_maps:
        compare_map(m)

    for m in glob.glob("../visual_tests/styles/*.xml"):
        compare_map(m)

# TODO - enforce that original xml does not equal first saved xml


def test_compare_map_deprecations():
    if not os.path.exists('../data/deprecated_maps/'):
        pytest.skip('Missing data')

    dep = glob.glob("../data/deprecated_maps/*.xml")
    dep = [os.path.normpath(p) for p in dep]
    for m in dep:
        compare_map(m)