/*
 * Copyright (C) 2020 The Android Open Source Project
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package com.android.timezone.location.data_pipeline.steps.tzs2polygons_tzs2cellunions;

import static com.android.timezone.location.data_pipeline.steps.TestSupport.copyTestResource;
import static org.junit.Assert.assertEquals;
import static org.junit.Assert.assertTrue;

import com.android.timezone.location.data_pipeline.steps.TestSupport;
import com.android.timezone.location.data_pipeline.steps.Types.ProtoStorageFormat;
import com.android.timezone.location.data_pipeline.steps.Types.TzS2CellUnion;
import com.android.timezone.location.data_pipeline.steps.TzIds;
import com.android.timezone.location.data_pipeline.steps.TzS2PolygonsToTzS2CellUnions;

import org.junit.After;
import org.junit.Before;
import org.junit.Test;

import java.io.File;
import java.io.IOException;
import java.nio.file.Path;

/** Tests for {@link TzS2PolygonsToTzS2CellUnions}. */
public final class TzS2PolygonsToTzS2CellUnionsTest {

    private Path mTempDirPath;

    @Before
    public void setUp() throws IOException {
        mTempDirPath = TestSupport.createTempDir(this.getClass());
    }

    @After
    public void tearDown() throws IOException {
        TestSupport.deleteDirectory(mTempDirPath);
    }

    /**
     * A regression test that should spot obvious, possibly unintentional, changes to the output
     * data by executing the test class with known input and output data.
     */
    @Test
    public void regressionTest() throws Exception {
        // A file containing just the polygons for Europe/London.
        String inputResource = "Europe_London_tzs2polygons.prototxt";
        String timeZoneId = "Europe/London";
        ProtoStorageFormat storageFormat = ProtoStorageFormat.TEXT;

        Path inputDirPath = mTempDirPath.resolve("input");
        copyTestResource(getClass(), inputResource, inputDirPath);

        final int threads = 1;
        Path outputDirPath = mTempDirPath.resolve("output");
        final int s2Level = 16;

        String[] args = {
                "--input", inputDirPath.toAbsolutePath().toString(),
                "--num-threads", Integer.toString(threads),
                "--output", outputDirPath.toAbsolutePath().toString(),
                "--max-s2-level", Integer.toString(s2Level),
        };
        TzS2PolygonsToTzS2CellUnions.main(args);

        Path expectedOutputDirPath = mTempDirPath.resolve("expected");
        Path expectedOutputFilePath = copyTestResource(getClass(),
                TzIds.fileNameSafe(timeZoneId) + TzS2CellUnion.getFileSuffix(storageFormat),
                expectedOutputDirPath
        );
        String expectedFileName = expectedOutputFilePath.getFileName().toString();

        File actualOutputFile = new File(outputDirPath.toFile(), expectedFileName);
        assertTrue("Expecting " + actualOutputFile + " to exist", actualOutputFile.exists());

        TzS2CellUnion actual = TzS2CellUnion.load(actualOutputFile, storageFormat);
        TzS2CellUnion expected = TzS2CellUnion.load(expectedOutputFilePath.toFile(), storageFormat);
        assertEquals(expected, actual);
    }
}
