import logging
import pytest
import re
import subprocess
import sys

import numpy

import rasterio
from rasterio.io import MemoryFile

logging.basicConfig(stream=sys.stderr, level=logging.DEBUG)

@pytest.mark.gdalbin
def test_nodata(tmpdir):
    dst_path = str(tmpdir.join('lol.tif'))
    with rasterio.open('tests/data/RGB.byte.tif') as src:
        with rasterio.open(dst_path, 'w', **src.meta) as dst:
            assert dst.nodata == 0.0
            assert dst.meta['nodata'] == 0.0
            assert dst.nodatavals == (0.0, 0.0, 0.0)
    info = subprocess.check_output([
        'gdalinfo', dst_path])
    pattern = b'Band 1.*?NoData Value=0'
    assert re.search(pattern, info, re.DOTALL) is not None
    pattern = b'Band 2.*?NoData Value=0'
    assert re.search(pattern, info, re.DOTALL) is not None
    pattern = b'Band 2.*?NoData Value=0'
    assert re.search(pattern, info, re.DOTALL) is not None

@pytest.mark.gdalbin
def test_set_nodata(tmpdir):
    dst_path = str(tmpdir.join('lol.tif'))
    with rasterio.open('tests/data/RGB.byte.tif') as src:
        meta = src.meta
        meta['nodata'] = 42
        with rasterio.open(dst_path, 'w', **meta) as dst:
            assert dst.nodata == 42
            assert dst.meta['nodata'] == 42
            assert dst.nodatavals == (42, 42, 42)
    info = subprocess.check_output([
        'gdalinfo', dst_path])
    pattern = b'Band 1.*?NoData Value=42'
    assert re.search(pattern, info, re.DOTALL) is not None
    pattern = b'Band 2.*?NoData Value=42'
    assert re.search(pattern, info, re.DOTALL) is not None
    pattern = b'Band 2.*?NoData Value=42'
    assert re.search(pattern, info, re.DOTALL) is not None


def test_set_mem_inf_nodata():
    with MemoryFile() as mem, mem.open(
        driver="GTiff", width=1, height=1, count=1, dtype='float32', nodata=float('inf')
    ) as src:
          assert numpy.isinf(src.nodata)


def test_set_inf_nodata(tmpdir):
    dst_path = str(tmpdir.join('lol.tif'))
    with rasterio.open('tests/data/RGB.byte.tif') as src:
        meta = src.meta
        meta['dtype'] ='float32'
        meta['nodata'] = float('inf')
        with rasterio.open(dst_path, 'w', **meta) as dst:
            assert numpy.isinf(dst.nodata)
            assert numpy.isinf(dst.meta['nodata'])
            assert numpy.isinf(dst.nodatavals).all()


def test_set_mem_nan_nodata():
    with MemoryFile() as mem, mem.open(
        driver="GTiff", width=1, height=1, count=1, dtype='float32', nodata=float('nan')
    ) as src:
          assert numpy.isnan(src.nodata)


def test_set_nan_nodata(tmpdir):
    dst_path = str(tmpdir.join('lol.tif'))
    with rasterio.open('tests/data/RGB.byte.tif') as src:
        meta = src.meta
        meta['dtype'] ='float32'
        meta['nodata'] = float('nan')
        with rasterio.open(dst_path, 'w', **meta) as dst:
            assert numpy.isnan(dst.nodata)
            assert numpy.isnan(dst.meta['nodata'])
            assert numpy.isnan(dst.nodatavals).all()