# coding=utf8
import os

from nose.tools import eq_
from nose.plugins.skip import SkipTest

import mapnik

from .utilities import execution_path, run_all


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('.'))

if 'sqlite' in mapnik.DatasourceCache.plugin_names():

    # the negative buffer on the layer should
    # override the postive map buffer leading
    # only one point to be rendered in the map
    def test_layer_buffer_size_1():
        if not os.path.exists('../data/good_maps/layer_buffer_size_reduction.xml'):
            raise SkipTest

        m = mapnik.Map(512, 512)
        eq_(m.buffer_size, 0)
        mapnik.load_map(m, '../data/good_maps/layer_buffer_size_reduction.xml')
        eq_(m.buffer_size, 256)
        eq_(m.layers[0].buffer_size, -150)
        m.zoom_all()
        im = mapnik.Image(m.width, m.height)
        mapnik.render(m, im)
        actual = '/tmp/mapnik-layer-buffer-size.png'
        expected = 'images/support/mapnik-layer-buffer-size.png'
        im.save(actual, "png32")
        expected_im = mapnik.Image.open(expected)
        eq_(im.tostring('png32'),
            expected_im.tostring('png32'),
            'failed comparing actual (%s) and expected (%s)' % (actual,
                                                                'tests/python_tests/' + expected))


if __name__ == "__main__":
    setup()
    exit(run_all(eval(x) for x in dir() if x.startswith("test_")))