#!/usr/bin/env pytest
# -*- coding: utf-8 -*-
###############################################################################
# $Id: test_gdal_contour.py 9c1d2cb8f61668b50989b1fcfd4193bbb648f40e 2020-06-27 21:10:06 +0200 Even Rouault $
#
# Project:  GDAL/OGR Test Suite
# Purpose:  gdal_contour testing
# Author:   Even Rouault <even dot rouault @ spatialys.com>
#
###############################################################################
# Copyright (c) 2009-2013, Even Rouault <even dot rouault at spatialys.com>
#
# Permission is hereby granted, free of charge, to any person obtaining a
# copy of this software and associated documentation files (the "Software"),
# to deal in the Software without restriction, including without limitation
# the rights to use, copy, modify, merge, publish, distribute, sublicense,
# and/or sell copies of the Software, and to permit persons to whom the
# Software is furnished to do so, subject to the following conditions:
#
# The above copyright notice and this permission notice shall be included
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# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
# OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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# DEALINGS IN THE SOFTWARE.
###############################################################################

import os
import struct


from osgeo import gdal
from osgeo import ogr
from osgeo import osr
import gdaltest
import ogrtest
import test_cli_utilities
import pytest

###############################################################################
# Test with -a and -i options


def test_gdal_contour_1():
    if test_cli_utilities.get_gdal_contour_path() is None:
        pytest.skip()

    try:
        os.remove('tmp/contour.shp')
    except OSError:
        pass
    try:
        os.remove('tmp/contour.dbf')
    except OSError:
        pass
    try:
        os.remove('tmp/contour.shx')
    except OSError:
        pass

    drv = gdal.GetDriverByName('GTiff')
    sr = osr.SpatialReference()
    sr.ImportFromEPSG(4326)
    wkt = sr.ExportToWkt()

    size = 160
    precision = 1. / size

    ds = drv.Create('tmp/gdal_contour.tif', size, size, 1)
    ds.SetProjection(wkt)
    ds.SetGeoTransform([1, precision, 0, 50, 0, -precision])

    raw_data = struct.pack('h', 10) * int(size / 2)
    for i in range(int(size / 2)):
        ds.WriteRaster(int(size / 4), i + int(size / 4), int(size / 2), 1, raw_data,
                       buf_type=gdal.GDT_Int16,
                       band_list=[1])

    raw_data = struct.pack('h', 20) * int(size / 2)
    for i in range(int(size / 4)):
        ds.WriteRaster(int(size / 4) + int(size / 8), i + int(size / 4) + int(size / 8), int(size / 4), 1, raw_data,
                       buf_type=gdal.GDT_Int16,
                       band_list=[1])

    raw_data = struct.pack('h', 25) * int(size / 4)
    for i in range(int(size / 8)):
        ds.WriteRaster(int(size / 4) + int(size / 8) + int(size / 16), i + int(size / 4) + int(size / 8) + int(size / 16), int(size / 8), 1, raw_data,
                       buf_type=gdal.GDT_Int16,
                       band_list=[1])

    ds = None

    (_, err) = gdaltest.runexternal_out_and_err(test_cli_utilities.get_gdal_contour_path() + ' -a elev -i 10 tmp/gdal_contour.tif tmp/contour.shp')
    assert (err is None or err == ''), 'got error/warning'

    ds = ogr.Open('tmp/contour.shp')

    expected_envelopes = [[1.25, 1.75, 49.25, 49.75],
                          [1.25 + 0.125, 1.75 - 0.125, 49.25 + 0.125, 49.75 - 0.125]]
    expected_height = [10, 20]

    lyr = ds.ExecuteSQL("select * from contour order by elev asc")

    assert lyr.GetSpatialRef().ExportToWkt() == wkt, 'Did not get expected spatial ref'

    assert lyr.GetFeatureCount() == len(expected_envelopes)

    i = 0
    feat = lyr.GetNextFeature()
    while feat is not None:
        envelope = feat.GetGeometryRef().GetEnvelope()
        assert feat.GetField('elev') == expected_height[i]
        for j in range(4):
            if expected_envelopes[i][j] != pytest.approx(envelope[j], abs=precision / 2 * 1.001):
                print('i=%d, wkt=%s' % (i, feat.GetGeometryRef().ExportToWkt()))
                print(feat.GetGeometryRef().GetEnvelope())
                pytest.fail('%f, %f' % (expected_envelopes[i][j] - envelope[j], precision / 2))
        i = i + 1
        feat = lyr.GetNextFeature()

    ds.ReleaseResultSet(lyr)
    ds.Destroy()

###############################################################################
# Test with -fl option and -3d option


def test_gdal_contour_2():
    if test_cli_utilities.get_gdal_contour_path() is None:
        pytest.skip()

    try:
        os.remove('tmp/contour.shp')
    except OSError:
        pass
    try:
        os.remove('tmp/contour.dbf')
    except OSError:
        pass
    try:
        os.remove('tmp/contour.shx')
    except OSError:
        pass

    # put -3d just after -fl to test #2793
    gdaltest.runexternal(test_cli_utilities.get_gdal_contour_path() + ' -a elev -fl 10 20 25 -3d tmp/gdal_contour.tif tmp/contour.shp')

    size = 160
    precision = 1. / size

    ds = ogr.Open('tmp/contour.shp')

    expected_envelopes = [[1.25, 1.75, 49.25, 49.75],
                          [1.25 + 0.125, 1.75 - 0.125, 49.25 + 0.125, 49.75 - 0.125],
                          [1.25 + 0.125 + 0.0625, 1.75 - 0.125 - 0.0625, 49.25 + 0.125 + 0.0625, 49.75 - 0.125 - 0.0625]]
    expected_height = [10, 20, 25]

    lyr = ds.ExecuteSQL("select * from contour order by elev asc")

    assert lyr.GetFeatureCount() == len(expected_envelopes)

    i = 0
    feat = lyr.GetNextFeature()
    while feat is not None:
        assert feat.GetGeometryRef().GetZ(0) == expected_height[i]
        envelope = feat.GetGeometryRef().GetEnvelope()
        assert feat.GetField('elev') == expected_height[i]
        for j in range(4):
            if expected_envelopes[i][j] != pytest.approx(envelope[j], abs=precision / 2 * 1.001):
                print('i=%d, wkt=%s' % (i, feat.GetGeometryRef().ExportToWkt()))
                print(feat.GetGeometryRef().GetEnvelope())
                pytest.fail('%f, %f' % (expected_envelopes[i][j] - envelope[j], precision / 2))
        i = i + 1
        feat = lyr.GetNextFeature()

    ds.ReleaseResultSet(lyr)
    ds.Destroy()

###############################################################################
# Test on a real DEM


def test_gdal_contour_3():
    if test_cli_utilities.get_gdal_contour_path() is None:
        pytest.skip()

    try:
        os.remove('tmp/contour.shp')
    except OSError:
        pass
    try:
        os.remove('tmp/contour.dbf')
    except OSError:
        pass
    try:
        os.remove('tmp/contour.shx')
    except OSError:
        pass

    # put -3d just after -fl to test #2793
    gdaltest.runexternal(test_cli_utilities.get_gdal_contour_path() + ' -a elev -i 50 ../gdrivers/data/n43.dt0 tmp/contour.shp')

    ds = ogr.Open('tmp/contour.shp')

    lyr = ds.ExecuteSQL("select distinct elev from contour order by elev asc")

    expected_heights = [100, 150, 200, 250, 300, 350, 400, 450]
    assert lyr.GetFeatureCount() == len(expected_heights)

    i = 0
    feat = lyr.GetNextFeature()
    while feat is not None:
        assert feat.GetField('elev') == expected_heights[i]
        i = i + 1
        feat = lyr.GetNextFeature()

    ds.ReleaseResultSet(lyr)
    ds.Destroy()

###############################################################################
# Test contour orientation


def test_gdal_contour_4():
    if test_cli_utilities.get_gdal_contour_path() is None:
        pytest.skip()

    try:
        os.remove('tmp/contour_orientation.shp')
    except OSError:
        pass
    try:
        os.remove('tmp/contour_orientation.dbf')
    except OSError:
        pass
    try:
        os.remove('tmp/contour_orientation.shx')
    except OSError:
        pass

    drv = gdal.GetDriverByName('GTiff')
    wkt = 'GEOGCS[\"WGS 84\",DATUM[\"WGS_1984\",SPHEROID[\"WGS 84\",6378137,298.257223563,AUTHORITY[\"EPSG\",\"7030\"]],AUTHORITY[\"EPSG\",\"6326\"]],PRIMEM[\"Greenwich\",0,AUTHORITY[\"EPSG\",\"8901\"]],UNIT[\"degree\",0.0174532925199433,AUTHORITY[\"EPSG\",\"9108\"]],AUTHORITY[\"EPSG\",\"4326\"]]'

    size = 160
    precision = 1. / size

    ds = drv.Create('tmp/gdal_contour_orientation.tif', size, size, 1)
    ds.SetProjection(wkt)
    ds.SetGeoTransform([1, precision, 0, 50, 0, -precision])

# Make the elevation 15 for the whole image
    raw_data = struct.pack('h', 15) * size
    for i in range(int(size)):
        ds.WriteRaster(0, i, int(size), 1, raw_data,
                       buf_type=gdal.GDT_Int16,
                       band_list=[1])

# Create a hill with elevation 25
    raw_data = struct.pack('h', 25) * 2
    for i in range(2):
        ds.WriteRaster(int(size / 4) + int(size / 8) - 1, i + int(size / 2) - 1, 2, 1, raw_data,
                       buf_type=gdal.GDT_Int16,
                       band_list=[1])

# Create a depression with elevation 5
    raw_data = struct.pack('h', 5) * 2
    for i in range(2):
        ds.WriteRaster(int(size / 2) + int(size / 8) - 1, i + int(size / 2) - 1, 2, 1, raw_data,
                       buf_type=gdal.GDT_Int16,
                       band_list=[1])

    ds = None

    gdaltest.runexternal(test_cli_utilities.get_gdal_contour_path() + ' -a elev -i 10 tmp/gdal_contour_orientation.tif tmp/contour_orientation1.shp')

    ds = ogr.Open('tmp/contour_orientation1.shp')

    expected_contours = ['LINESTRING (' +
                         '1.628125 49.493749999999999,' +
                         '1.63125 49.496875000000003,' +
                         '1.63125 49.503124999999997,' +
                         '1.628125 49.50625,' +
                         '1.621875 49.50625,' +
                         '1.61875 49.503124999999997,' +
                         '1.61875 49.496875000000003,' +
                         '1.621875 49.493749999999999,' +
                         '1.628125 49.493749999999999)',
                         'LINESTRING (' +
                         '1.38125 49.496875000000003,' +
                         '1.378125 49.493749999999999,' +
                         '1.371875 49.493749999999999,' +
                         '1.36875 49.496875000000003,' +
                         '1.36875 49.503124999999997,' +
                         '1.371875 49.50625,' +
                         '1.378125 49.50625,' +
                         '1.38125 49.503124999999997,' +
                         '1.38125 49.496875000000003)']
    expected_elev = [10, 20]

    lyr = ds.ExecuteSQL("select * from contour_orientation1 order by elev asc")

    assert lyr.GetFeatureCount() == len(expected_contours)

    i = 0
    test_failed = False
    feat = lyr.GetNextFeature()
    while feat is not None:
        expected_geom = ogr.CreateGeometryFromWkt(expected_contours[i])
        assert feat.GetField('elev') == expected_elev[i]
        if ogrtest.check_feature_geometry(feat, expected_geom, 0.01) != 0:
            print('Got      %s.\nExpected %s' % (feat.GetGeometryRef().ExportToWkt(), expected_contours[i]))
            test_failed = True
        i = i + 1
        feat = lyr.GetNextFeature()

    ds.ReleaseResultSet(lyr)
    ds.Destroy()

    assert not test_failed

###############################################################################
# Test contour orientation


def test_gdal_contour_5():
    if test_cli_utilities.get_gdal_contour_path() is None:
        pytest.skip()

    ds = None

    gdaltest.runexternal(test_cli_utilities.get_gdal_contour_path() + ' -a elev -i 10 data/contour_orientation.tif tmp/contour_orientation2.shp')

    ds = ogr.Open('tmp/contour_orientation2.shp')

    expected_contours =     ['LINESTRING (0.0 1.999999,' +
                             '0.5 1.999999,' +
                             '1.5 1.999999,' +
                             '1.95454293244555 2.5,' +
                             '2.1249976158233 3.5,' +
                             '1.5 3.9545460850748,' +
                             '0.5 4.06666564941406,' +
                             '0.0 4.06666564941406)']
    expected_elev = [140]

    lyr = ds.ExecuteSQL("select * from contour_orientation2 order by elev asc")

    assert lyr.GetFeatureCount() == len(expected_contours)

    i = 0
    test_failed = False
    feat = lyr.GetNextFeature()
    while feat is not None:
        expected_geom = ogr.CreateGeometryFromWkt(expected_contours[i])
        assert feat.GetField('elev') == expected_elev[i]
        if ogrtest.check_feature_geometry(feat, expected_geom) != 0:
            print('Got      %s.\nExpected %s' % (feat.GetGeometryRef().ExportToWkt(), expected_contours[i]))
            test_failed = True
        i = i + 1
        feat = lyr.GetNextFeature()

    ds.ReleaseResultSet(lyr)
    ds.Destroy()

    assert not test_failed

###############################################################################
# Cleanup


def test_gdal_contour_cleanup():
    if test_cli_utilities.get_gdal_contour_path() is None:
        pytest.skip()

    ogr.GetDriverByName('ESRI Shapefile').DeleteDataSource('tmp/contour.shp')
    ogr.GetDriverByName('ESRI Shapefile').DeleteDataSource('tmp/contour_orientation1.shp')
    ogr.GetDriverByName('ESRI Shapefile').DeleteDataSource('tmp/contour_orientation2.shp')
    try:
        os.remove('tmp/gdal_contour.tif')
        os.remove('tmp/gdal_contour_orientation.tif')
    except OSError:
        pass

    



