#!/usr/bin/env pytest
###############################################################################
# $Id$
#
# Project:  GDAL/OGR Test Suite
# Purpose:  To test the functionality of ogr_layer_algebra script
# Author:   Radha Krishna Kavuluru <kssvrk@gmail.com>
#
###############################################################################
# Copyright (c) 2022, Radha Krishna Kavuluru <kssvrk@gmail.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
# in all copies or substantial portions of the Software.
#
# 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
# THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
# FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
# DEALINGS IN THE SOFTWARE.
###############################################################################

import ogrtest
import pytest
import test_py_scripts

from osgeo import ogr

pytestmark = [
    pytest.mark.skipif(
        test_py_scripts.get_py_script("ogr_layer_algebra") is None,
        reason="ogr_layer_algebra.py not available",
    ),
    pytest.mark.skipif(not ogrtest.have_geos(), reason="GEOS missing"),
]


@pytest.fixture()
def script_path():
    return test_py_scripts.get_py_script("ogr_layer_algebra")


###############################################################################

# Test Intersection


def test_ogr_layer_algebra_intersection(script_path):

    # Create input,method,output paths for intersection.
    input_path = "tmp/input_layer.shp"
    method_path = "tmp/method_layer.shp"
    output_path = "tmp/output_layer.shp"

    # definition of input,method layers
    input_layer = ogr.GetDriverByName("ESRI Shapefile").CreateDataSource(input_path)
    method_layer = ogr.GetDriverByName("ESRI Shapefile").CreateDataSource(method_path)

    A = input_layer.CreateLayer("poly")
    B = method_layer.CreateLayer("poly")

    a1 = "POLYGON((1 2, 1 3, 3 3, 3 2, 1 2))"
    a2 = "POLYGON((5 2, 5 3, 7 3, 7 2, 5 2))"
    b1 = "POLYGON((2 1, 2 4, 6 4, 6 1, 2 1))"

    feat = ogr.Feature(A.GetLayerDefn())
    feat.SetGeometryDirectly(ogr.Geometry(wkt=a1))
    A.CreateFeature(feat)

    feat = ogr.Feature(A.GetLayerDefn())
    feat.SetGeometryDirectly(ogr.Geometry(wkt=a2))
    A.CreateFeature(feat)

    input_layer = None

    feat = ogr.Feature(B.GetLayerDefn())
    feat.SetGeometryDirectly(ogr.Geometry(wkt=b1))
    B.CreateFeature(feat)

    method_layer = None

    # executing script
    test_py_scripts.run_py_script(
        script_path,
        "ogr_layer_algebra",
        f"Intersection -input_ds {input_path} -output_ds {output_path}  -method_ds {method_path}",
    )

    driver = ogr.GetDriverByName("ESRI Shapefile")
    dataSource = driver.Open(output_path, 0)
    layer = dataSource.GetLayer()
    featureCount = layer.GetFeatureCount()

    # deleting shapefiles after test
    driver.DeleteDataSource(input_path)
    driver.DeleteDataSource(method_path)
    driver.DeleteDataSource(output_path)

    assert featureCount == 2


###############################################################################

# Test Union


def test_ogr_layer_algebra_union(script_path):

    # Create input,method,output paths for intersection.
    input_path = "tmp/input_layer.shp"
    method_path = "tmp/method_layer.shp"
    output_path = "tmp/output_layer.shp"

    # definition of input,method layers
    input_layer = ogr.GetDriverByName("ESRI Shapefile").CreateDataSource(input_path)
    method_layer = ogr.GetDriverByName("ESRI Shapefile").CreateDataSource(method_path)

    A = input_layer.CreateLayer("poly")
    B = method_layer.CreateLayer("poly")

    a1 = "POLYGON((1 2, 1 3, 3 3, 3 2, 1 2))"
    a2 = "POLYGON((5 2, 5 3, 7 3, 7 2, 5 2))"
    b1 = "POLYGON((2 1, 2 4, 6 4, 6 1, 2 1))"

    feat = ogr.Feature(A.GetLayerDefn())
    feat.SetGeometryDirectly(ogr.Geometry(wkt=a1))
    A.CreateFeature(feat)

    feat = ogr.Feature(A.GetLayerDefn())
    feat.SetGeometryDirectly(ogr.Geometry(wkt=a2))
    A.CreateFeature(feat)

    input_layer = None

    feat = ogr.Feature(B.GetLayerDefn())
    feat.SetGeometryDirectly(ogr.Geometry(wkt=b1))
    B.CreateFeature(feat)

    method_layer = None

    # executing script
    test_py_scripts.run_py_script(
        script_path,
        "ogr_layer_algebra",
        f"Union -input_ds {input_path} -output_ds {output_path}  -method_ds {method_path}",
    )

    driver = ogr.GetDriverByName("ESRI Shapefile")
    dataSource = driver.Open(output_path, 0)
    layer = dataSource.GetLayer()
    featureCount = layer.GetFeatureCount()

    # deleting shapefiles after test
    driver.DeleteDataSource(input_path)
    driver.DeleteDataSource(method_path)
    driver.DeleteDataSource(output_path)

    assert featureCount == 5


###############################################################################

# Test Symmetric Difference


def test_ogr_layer_algebra_symdifference(script_path):

    # Create input,method,output paths for intersection.
    input_path = "tmp/input_layer.shp"
    method_path = "tmp/method_layer.shp"
    output_path = "tmp/output_layer.shp"

    # definition of input,method layers
    input_layer = ogr.GetDriverByName("ESRI Shapefile").CreateDataSource(input_path)
    method_layer = ogr.GetDriverByName("ESRI Shapefile").CreateDataSource(method_path)

    A = input_layer.CreateLayer("poly")
    B = method_layer.CreateLayer("poly")

    a1 = "POLYGON((1 2, 1 3, 3 3, 3 2, 1 2))"
    a2 = "POLYGON((5 2, 5 3, 7 3, 7 2, 5 2))"
    b1 = "POLYGON((2 1, 2 4, 6 4, 6 1, 2 1))"
    b2 = "POLYGON((2 4, 2 6, 6 6, 6 4, 2 4))"

    feat = ogr.Feature(A.GetLayerDefn())
    feat.SetGeometryDirectly(ogr.Geometry(wkt=a1))
    A.CreateFeature(feat)

    feat = ogr.Feature(A.GetLayerDefn())
    feat.SetGeometryDirectly(ogr.Geometry(wkt=a2))
    A.CreateFeature(feat)

    input_layer = None

    feat = ogr.Feature(B.GetLayerDefn())
    feat.SetGeometryDirectly(ogr.Geometry(wkt=b1))
    B.CreateFeature(feat)

    feat = ogr.Feature(B.GetLayerDefn())
    feat.SetGeometryDirectly(ogr.Geometry(wkt=b2))
    B.CreateFeature(feat)

    method_layer = None

    # executing script
    test_py_scripts.run_py_script(
        script_path,
        "ogr_layer_algebra",
        f"SymDifference -input_ds {input_path} -output_ds {output_path}  -method_ds {method_path}",
    )

    driver = ogr.GetDriverByName("ESRI Shapefile")
    dataSource = driver.Open(output_path, 0)
    layer = dataSource.GetLayer()
    featureCount = layer.GetFeatureCount()

    # deleting shapefiles after test
    driver.DeleteDataSource(input_path)
    driver.DeleteDataSource(method_path)
    driver.DeleteDataSource(output_path)

    assert featureCount == 4


###############################################################################

# Test Identity


def test_ogr_layer_algebra_identity(script_path):

    # Create input,method,output paths for intersection.
    input_path = "tmp/input_layer.shp"
    method_path = "tmp/method_layer.shp"
    output_path = "tmp/output_layer.shp"

    # definition of input,method layers
    input_layer = ogr.GetDriverByName("ESRI Shapefile").CreateDataSource(input_path)
    method_layer = ogr.GetDriverByName("ESRI Shapefile").CreateDataSource(method_path)

    A = input_layer.CreateLayer("poly")
    B = method_layer.CreateLayer("poly")

    a1 = "POLYGON((1 2, 1 3, 3 3, 3 2, 1 2))"
    a2 = "POLYGON((5 2, 5 3, 7 3, 7 2, 5 2))"
    b1 = "POLYGON((2 1, 2 4, 6 4, 6 1, 2 1))"
    b2 = "POLYGON((2 4, 2 6, 6 6, 6 4, 2 4))"

    feat = ogr.Feature(A.GetLayerDefn())
    feat.SetGeometryDirectly(ogr.Geometry(wkt=a1))
    A.CreateFeature(feat)

    feat = ogr.Feature(A.GetLayerDefn())
    feat.SetGeometryDirectly(ogr.Geometry(wkt=a2))
    A.CreateFeature(feat)

    input_layer = None

    feat = ogr.Feature(B.GetLayerDefn())
    feat.SetGeometryDirectly(ogr.Geometry(wkt=b1))
    B.CreateFeature(feat)

    feat = ogr.Feature(B.GetLayerDefn())
    feat.SetGeometryDirectly(ogr.Geometry(wkt=b2))
    B.CreateFeature(feat)

    method_layer = None

    # executing script
    test_py_scripts.run_py_script(
        script_path,
        "ogr_layer_algebra",
        f"Identity -input_ds {input_path} -output_ds {output_path}  -method_ds {method_path}",
    )

    driver = ogr.GetDriverByName("ESRI Shapefile")
    dataSource = driver.Open(output_path, 0)
    layer = dataSource.GetLayer()
    featureCount = layer.GetFeatureCount()

    # deleting shapefiles after test
    driver.DeleteDataSource(input_path)
    driver.DeleteDataSource(method_path)
    driver.DeleteDataSource(output_path)

    assert featureCount == 4


###############################################################################

# Test Update


def test_ogr_layer_algebra_update(script_path):

    # Create input,method,output paths for intersection.
    input_path = "tmp/input_layer.shp"
    method_path = "tmp/method_layer.shp"
    output_path = "tmp/output_layer.shp"

    # definition of input,method layers
    input_layer = ogr.GetDriverByName("ESRI Shapefile").CreateDataSource(input_path)
    method_layer = ogr.GetDriverByName("ESRI Shapefile").CreateDataSource(method_path)

    A = input_layer.CreateLayer("poly")
    B = method_layer.CreateLayer("poly")

    a1 = "POLYGON((1 2, 1 3, 3 3, 3 2, 1 2))"
    a2 = "POLYGON((5 2, 5 3, 7 3, 7 2, 5 2))"
    b1 = "POLYGON((2 1, 2 4, 6 4, 6 1, 2 1))"

    feat = ogr.Feature(A.GetLayerDefn())
    feat.SetGeometryDirectly(ogr.Geometry(wkt=a1))
    A.CreateFeature(feat)

    feat = ogr.Feature(A.GetLayerDefn())
    feat.SetGeometryDirectly(ogr.Geometry(wkt=a2))
    A.CreateFeature(feat)

    input_layer = None

    feat = ogr.Feature(B.GetLayerDefn())
    feat.SetGeometryDirectly(ogr.Geometry(wkt=b1))
    B.CreateFeature(feat)

    method_layer = None

    # executing script
    test_py_scripts.run_py_script(
        script_path,
        "ogr_layer_algebra",
        f"Update -input_ds {input_path} -output_ds {output_path}  -method_ds {method_path}",
    )

    driver = ogr.GetDriverByName("ESRI Shapefile")
    dataSource = driver.Open(output_path, 0)
    layer = dataSource.GetLayer()
    featureCount = layer.GetFeatureCount()

    # deleting shapefiles after test
    driver.DeleteDataSource(input_path)
    driver.DeleteDataSource(method_path)
    driver.DeleteDataSource(output_path)

    assert featureCount == 3


###############################################################################

# Test Clip


def test_ogr_layer_algebra_clip(script_path):

    # Create input,method,output paths for intersection.
    input_path = "tmp/input_layer.shp"
    method_path = "tmp/method_layer.shp"
    output_path = "tmp/output_layer.shp"

    # definition of input,method layers
    input_layer = ogr.GetDriverByName("ESRI Shapefile").CreateDataSource(input_path)
    method_layer = ogr.GetDriverByName("ESRI Shapefile").CreateDataSource(method_path)

    A = input_layer.CreateLayer("poly")
    B = method_layer.CreateLayer("poly")

    a1 = "POLYGON((1 2, 1 3, 3 3, 3 2, 1 2))"
    a2 = "POLYGON((5 2, 5 3, 7 3, 7 2, 5 2))"
    b1 = "POLYGON((2 1, 2 4, 6 4, 6 1, 2 1))"

    feat = ogr.Feature(A.GetLayerDefn())
    feat.SetGeometryDirectly(ogr.Geometry(wkt=a1))
    A.CreateFeature(feat)

    feat = ogr.Feature(A.GetLayerDefn())
    feat.SetGeometryDirectly(ogr.Geometry(wkt=a2))
    A.CreateFeature(feat)

    input_layer = None

    feat = ogr.Feature(B.GetLayerDefn())
    feat.SetGeometryDirectly(ogr.Geometry(wkt=b1))
    B.CreateFeature(feat)

    method_layer = None

    # executing script
    test_py_scripts.run_py_script(
        script_path,
        "ogr_layer_algebra",
        f"Clip -input_ds {input_path} -output_ds {output_path}  -method_ds {method_path}",
    )

    driver = ogr.GetDriverByName("ESRI Shapefile")
    dataSource = driver.Open(output_path, 0)
    layer = dataSource.GetLayer()
    featureCount = layer.GetFeatureCount()

    # deleting shapefiles after test
    driver.DeleteDataSource(input_path)
    driver.DeleteDataSource(method_path)
    driver.DeleteDataSource(output_path)

    assert featureCount == 2


###############################################################################

# Test Erase


def test_ogr_layer_algebra_erase(script_path):

    # Create input,method,output paths for intersection.
    input_path = "tmp/input_layer.shp"
    method_path = "tmp/method_layer.shp"
    output_path = "tmp/output_layer.shp"

    # definition of input,method layers
    input_layer = ogr.GetDriverByName("ESRI Shapefile").CreateDataSource(input_path)
    method_layer = ogr.GetDriverByName("ESRI Shapefile").CreateDataSource(method_path)

    A = input_layer.CreateLayer("poly")
    B = method_layer.CreateLayer("poly")

    a1 = "POLYGON((1 2, 1 3, 3 3, 3 2, 1 2))"
    a2 = "POLYGON((5 2, 5 3, 7 3, 7 2, 5 2))"
    b1 = "POLYGON((2 1, 2 4, 6 4, 6 1, 2 1))"
    b2 = "POLYGON((2 4, 2 6, 6 6, 6 4, 2 4))"

    feat = ogr.Feature(A.GetLayerDefn())
    feat.SetGeometryDirectly(ogr.Geometry(wkt=a1))
    A.CreateFeature(feat)

    feat = ogr.Feature(A.GetLayerDefn())
    feat.SetGeometryDirectly(ogr.Geometry(wkt=a2))
    A.CreateFeature(feat)

    input_layer = None

    feat = ogr.Feature(B.GetLayerDefn())
    feat.SetGeometryDirectly(ogr.Geometry(wkt=b1))
    B.CreateFeature(feat)

    feat = ogr.Feature(B.GetLayerDefn())
    feat.SetGeometryDirectly(ogr.Geometry(wkt=b2))
    B.CreateFeature(feat)

    method_layer = None

    # executing script
    test_py_scripts.run_py_script(
        script_path,
        "ogr_layer_algebra",
        f"Erase -input_ds {input_path} -output_ds {output_path}  -method_ds {method_path}",
    )

    driver = ogr.GetDriverByName("ESRI Shapefile")
    dataSource = driver.Open(output_path, 0)
    layer = dataSource.GetLayer()
    featureCount = layer.GetFeatureCount()

    # deleting shapefiles after test
    driver.DeleteDataSource(input_path)
    driver.DeleteDataSource(method_path)
    driver.DeleteDataSource(output_path)

    assert featureCount == 2