package com.trafficaudit.holiday.service;
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import org.junit.jupiter.api.Test;
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import javax.imageio.ImageIO;
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import java.awt.image.BufferedImage;
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import java.io.ByteArrayInputStream;
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import java.math.BigDecimal;
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import static org.junit.jupiter.api.Assertions.assertArrayEquals;
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import static org.junit.jupiter.api.Assertions.assertEquals;
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import static org.junit.jupiter.api.Assertions.assertFalse;
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import static org.junit.jupiter.api.Assertions.assertNotNull;
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import static org.junit.jupiter.api.Assertions.assertTrue;
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class HolidayTrendChartServiceTest {
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@Test
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void rendersLinePieAndStackedChartsAsPng() throws Exception {
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HolidayTrendChartService service = new HolidayTrendChartService();
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HolidayTrendChartService.ChartSeries first = new HolidayTrendChartService.ChartSeries();
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first.setName("2026年");
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first.setValues(java.util.Arrays.asList(
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java.math.BigDecimal.ONE, java.math.BigDecimal.TEN, null));
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HolidayTrendChartService.ChartSeries second = new HolidayTrendChartService.ChartSeries();
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second.setName("2025年");
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second.setValues(java.util.Arrays.asList(
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java.math.BigDecimal.valueOf(2), java.math.BigDecimal.valueOf(8),
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java.math.BigDecimal.valueOf(4)));
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byte[] line = service.lineChart("万人次", java.util.Arrays.asList(first, second), false);
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assertPng(line);
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assertNoLargeLightGrayBackground(line);
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HolidayTrendChartService.ChartCategory category = new HolidayTrendChartService.ChartCategory();
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category.setName("铁路");
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category.setValue(java.math.BigDecimal.TEN);
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byte[] pie = service.pieChart("人次", java.util.Collections.singletonList(category), 400, 300);
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assertPng(pie);
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byte[] stacked = service.stackedBarChart("占比", java.util.Arrays.asList("10月1日", "10月2日"),
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java.util.Arrays.asList(first, second), true, 500, 320);
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assertPng(stacked);
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assertNoLargeLightGrayBackground(stacked);
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}
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@Test
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void roundsLineDataToTheSamePrecisionAsLabels() {
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assertEquals(new BigDecimal("0.49"),
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HolidayTrendChartService.displayValue(new BigDecimal("0.4904"), false, 2));
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assertEquals(new BigDecimal("0.49"),
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HolidayTrendChartService.displayValue(new BigDecimal("0.4911"), false, 2));
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assertEquals(new BigDecimal("0.491"),
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HolidayTrendChartService.displayValue(new BigDecimal("0.4911"), false, 3));
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assertEquals(new BigDecimal("0.123"),
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HolidayTrendChartService.displayValue(new BigDecimal("0.1234"), true, 2));
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}
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@Test
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void rendersSameGeometryWhenValuesRoundToSameLabel() {
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HolidayTrendChartService service = new HolidayTrendChartService();
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HolidayTrendChartService.ChartSeries first = new HolidayTrendChartService.ChartSeries();
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first.setName("平均拥挤度");
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first.setValues(java.util.Arrays.asList(
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new BigDecimal("0.4904"), new BigDecimal("0.4923"), new BigDecimal("0.5100")));
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HolidayTrendChartService.ChartSeries second = new HolidayTrendChartService.ChartSeries();
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second.setName("平均拥挤度");
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second.setValues(java.util.Arrays.asList(
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new BigDecimal("0.4911"), new BigDecimal("0.4934"), new BigDecimal("0.5100")));
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byte[] firstChart = service.lineChart("拥挤度",
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java.util.Collections.singletonList(first), false, 2, 1100, 590);
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byte[] secondChart = service.lineChart("拥挤度",
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java.util.Collections.singletonList(second), false, 2, 1100, 590);
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assertPng(firstChart);
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assertPng(secondChart);
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assertArrayEquals(firstChart, secondChart);
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}
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@Test
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void scalesLineChartHeightForBetterVerticalSeparation() throws Exception {
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HolidayTrendChartService service = new HolidayTrendChartService();
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HolidayTrendChartService.ChartSeries series = new HolidayTrendChartService.ChartSeries();
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series.setName("测试");
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series.setValues(java.util.Arrays.asList(
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new BigDecimal("1.00"), new BigDecimal("2.00"), new BigDecimal("3.00")));
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byte[] png = service.lineChart("万人次",
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java.util.Collections.singletonList(series), false, 1100, 590);
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BufferedImage image = ImageIO.read(new ByteArrayInputStream(png));
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assertNotNull(image);
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assertEquals(HolidayTrendChartService.scaleLineChartHeight(590), image.getHeight());
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}
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@Test
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void rendersHigherPrecisionLineLabelsWhenRequested() {
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HolidayTrendChartService service = new HolidayTrendChartService();
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HolidayTrendChartService.ChartSeries congestion = new HolidayTrendChartService.ChartSeries();
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congestion.setName("平均拥挤度");
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congestion.setValues(java.util.Arrays.asList(
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new java.math.BigDecimal("0.467029"),
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new java.math.BigDecimal("0.490890"),
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new java.math.BigDecimal("0.492414")));
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byte[] twoDecimals = service.lineChart("拥挤度",
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java.util.Collections.singletonList(congestion), false, 2, 1100, 590);
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byte[] threeDecimals = service.lineChart("拥挤度",
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java.util.Collections.singletonList(congestion), false, 3, 1100, 590);
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assertPng(twoDecimals);
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assertPng(threeDecimals);
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assertFalse(java.util.Arrays.equals(twoDecimals, threeDecimals));
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}
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private void assertNoLargeLightGrayBackground(byte[] data) throws Exception {
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BufferedImage image = ImageIO.read(new ByteArrayInputStream(data));
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int matches = 0;
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for (int y = 0; y < image.getHeight(); y++) {
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for (int x = 0; x < image.getWidth(); x++) {
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int rgb = image.getRGB(x, y) & 0xFFFFFF;
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if (rgb == 0xF3F4F3) matches++;
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}
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}
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assertTrue(matches < image.getWidth() * image.getHeight() / 20,
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"chart still contains a large light-gray background area");
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}
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private void assertPng(byte[] data) {
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assertNotNull(data);
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assertTrue(data.length > 100);
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assertTrue(data[0] == (byte) 0x89 && data[1] == 0x50
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&& data[2] == 0x4e && data[3] == 0x47);
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}
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}
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