package com.vincent.rsf.server.common.utils;

import org.apache.poi.ss.usermodel.CellStyle;
import org.apache.poi.ss.usermodel.Font;
import org.apache.poi.ss.usermodel.HorizontalAlignment;
import org.apache.poi.ss.usermodel.Sheet;
import org.apache.poi.ss.usermodel.Workbook;
import org.junit.jupiter.api.Test;

import java.lang.reflect.Constructor;
import java.lang.reflect.Modifier;
import java.util.LinkedHashMap;
import java.util.List;
import java.util.Map;

import static org.junit.jupiter.api.Assertions.assertEquals;
import static org.junit.jupiter.api.Assertions.assertTrue;
import static org.junit.jupiter.api.Assertions.fail;

class ExcelUtilReportStyleTest {

    @Test
    void exportMetaExposesPublicSixArgReportStyleConstructorContract() {
        Constructor<?> constructor = findPublicReportStyleConstructor(
                "ExcelUtil.ExportMeta has not exposed a public reportStyle constructor contract yet; expected a public 6-arg constructor whose sixth parameter is a Map-compatible reportStyle payload."
        );

        assertEquals(6, constructor.getParameterCount(), "ExcelUtil.ExportMeta must expose a public 6-arg constructor for reportStyle.");
        assertTrue(
                Map.class.isAssignableFrom(constructor.getParameterTypes()[5]),
                "ExcelUtil.ExportMeta public reportStyle constructor must accept a Map-compatible sixth argument."
        );
    }

    @Test
    void createBuildsSharedReportSkeletonWhenLandscapeReportStyleIsProvided() throws Exception {
        Constructor<?> constructor = findPublicReportStyleConstructor(
                "Cannot verify landscape reportStyle runtime behavior until ExcelUtil.ExportMeta exposes a public 6-arg constructor whose sixth parameter is a Map-compatible reportStyle payload."
        );
        List<Map<String, Object>> rows = List.of(row("1", "管理员"));
        List<ExcelUtil.ExportColumn> columns = List.of(
                new ExcelUtil.ExportColumn("sequence", "序号"),
                new ExcelUtil.ExportColumn("name", "角色名称")
        );
        ExcelUtil.ExportMeta exportMeta = (ExcelUtil.ExportMeta) constructor.newInstance(
                "角色管理报表",
                "2026-03-29",
                "2026-03-29 10:00:00",
                "tester",
                rows.size(),
                Map.of(
                        "orientation", "landscape",
                        "showSequence", true
                )
        );

        try (Workbook workbook = ExcelUtil.create(rows, columns, exportMeta)) {
            Sheet sheet = workbook.getSheetAt(0);

            assertEquals("角色管理报表", sheet.getRow(0).getCell(0).getStringCellValue());

            CellStyle titleStyle = sheet.getRow(0).getCell(0).getCellStyle();
            assertEquals(HorizontalAlignment.CENTER, titleStyle.getAlignment());

            Font titleFont = workbook.getFontAt(titleStyle.getFontIndex());
            assertTrue(titleFont.getFontHeightInPoints() >= 14);

            assertTrue(sheet.getRow(1).getCell(0).getStringCellValue().startsWith("报表日期:"));
            assertTrue(sheet.getPrintSetup().getLandscape());
            assertEquals("角色名称", sheet.getRow(3).getCell(1).getStringCellValue());
        }
    }

    @Test
    void createPrependsSequenceColumnByDefaultWhenReportStyleOmitsShowSequence() throws Exception {
        Constructor<?> constructor = findPublicReportStyleConstructor(
                "Cannot verify default showSequence behavior until ExcelUtil.ExportMeta exposes a public 6-arg constructor whose sixth parameter is a Map-compatible reportStyle payload."
        );
        List<Map<String, Object>> rows = List.of(row(null, "管理员"));
        List<ExcelUtil.ExportColumn> columns = List.of(
                new ExcelUtil.ExportColumn("name", "角色名称")
        );
        ExcelUtil.ExportMeta exportMeta = (ExcelUtil.ExportMeta) constructor.newInstance(
                "角色管理报表",
                "2026-03-29",
                "2026-03-29 10:00:00",
                "tester",
                rows.size(),
                Map.of("orientation", "portrait")
        );

        try (Workbook workbook = ExcelUtil.create(rows, columns, exportMeta)) {
            Sheet sheet = workbook.getSheetAt(0);

            assertEquals("序号", sheet.getRow(3).getCell(0).getStringCellValue());
            assertEquals("1", sheet.getRow(4).getCell(0).getStringCellValue());
            assertEquals("角色名称", sheet.getRow(3).getCell(1).getStringCellValue());
        }
    }

    private Constructor<?> findPublicReportStyleConstructor(String missingConstructorMessage) {
        for (Constructor<?> constructor : ExcelUtil.ExportMeta.class.getConstructors()) {
            if (!Modifier.isPublic(constructor.getModifiers()) || constructor.getParameterCount() != 6) {
                continue;
            }
            Class<?>[] parameterTypes = constructor.getParameterTypes();
            if (Map.class.isAssignableFrom(parameterTypes[5])) {
                return constructor;
            }
        }
        fail(missingConstructorMessage);
        return null;
    }

    private Map<String, Object> row(String sequence, String name) {
        Map<String, Object> row = new LinkedHashMap<>();
        row.put("sequence", sequence);
        row.put("name", name);
        return row;
    }
}