package platform.common.util;

import com.google.common.collect.Lists;
import org.apache.commons.lang3.StringUtils;
import org.apache.poi.ss.usermodel.*;
import org.apache.poi.ss.util.CellRangeAddress;
import org.apache.poi.xssf.streaming.SXSSFSheet;
import org.apache.poi.xssf.streaming.SXSSFWorkbook;
import org.apache.poi.xssf.usermodel.XSSFClientAnchor;
import org.apache.poi.xssf.usermodel.XSSFRichTextString;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import platform.common.annotation.ExcelField;

import javax.servlet.http.HttpServletResponse;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.OutputStream;
import java.lang.reflect.Field;
import java.lang.reflect.Method;
import java.net.URLEncoder;
import java.util.*;

public class ExportExcel {

    private static Logger log = LoggerFactory.getLogger(ExportExcel.class);

    /**
     * 工作薄对象
     */
    private SXSSFWorkbook wb;

    /**
     * 工作表对象
     */
    private Sheet sheet;

    /**
     * 样式列表
     */
    private Map<String, CellStyle> styles;

    /**
     * 当前行号
     */
    private int rownum;

    /**
     * 注解列表（Object[]{ ExcelField, Field/Method }）
     */
    List<Object[]> annotationList = Lists.newArrayList();

    /**
     * 构造函数
     *
     * @param title 表格标题，传“空值”，表示无标题
     * @param cls   实体对象，通过annotation.ExportField获取标题
     */
    public ExportExcel(String title, Class<?> cls) {
        this(title, cls, 1);
    }

    /**
     * 构造函数
     *
     * @param title  表格标题，传“空值”，表示无标题
     * @param cls    实体对象，通过annotation.ExportField获取标题
     * @param type   导出类型（1:导出数据；2：导出模板）
     * @param groups 导入分组
     */
    public ExportExcel(String title, Class<?> cls, int type, int... groups) {
        // Get annotation field
        Field[] fs = cls.getDeclaredFields();
        for (Field f : fs) {
            ExcelField ef = f.getAnnotation(ExcelField.class);
            if (ef != null && (ef.type() == 0 || ef.type() == type)) {
                if (groups != null && groups.length > 0) {
                    boolean inGroup = false;
                    for (int g : groups) {
                        if (inGroup) {
                            break;
                        }
                        for (int efg : ef.groups()) {
                            if (g == efg) {
                                inGroup = true;
                                annotationList.add(new Object[]{ef, f});
                                break;
                            }
                        }
                    }
                } else {
                    annotationList.add(new Object[]{ef, f});
                }
            }
        }
        // Get annotation method
        Method[] ms = cls.getDeclaredMethods();
        for (Method m : ms) {
            ExcelField ef = m.getAnnotation(ExcelField.class);
            if (ef != null && (ef.type() == 0 || ef.type() == type)) {
                if (groups != null && groups.length > 0) {
                    boolean inGroup = false;
                    for (int g : groups) {
                        if (inGroup) {
                            break;
                        }
                        for (int efg : ef.groups()) {
                            if (g == efg) {
                                inGroup = true;
                                annotationList.add(new Object[]{ef, m});
                                break;
                            }
                        }
                    }
                } else {
                    annotationList.add(new Object[]{ef, m});
                }
            }
        }
        // Field sorting
        Collections.sort(annotationList, new Comparator<Object[]>() {
            public int compare(Object[] o1, Object[] o2) {
                return new Integer(((ExcelField) o1[0]).sort()).compareTo(
                        new Integer(((ExcelField) o2[0]).sort()));
            }

            ;
        });
        // Initialize
        List<String> headerList = Lists.newArrayList();
        for (Object[] os : annotationList) {
            String t = ((ExcelField) os[0]).title();
            // 如果是导出，则去掉注释
            if (type == 1) {
                String[] ss = StringUtils.split(t, "**", 2);
                if (ss.length == 2) {
                    t = ss[0];
                }
            }
            headerList.add(t);
        }
        initialize(title, headerList);
    }

    /**
     * 构造函数
     *
     * @param title      表格标题，传“空值”，表示无标题
     * @param headerList 表头列表
     */
    public ExportExcel(String title, List<String> headerList) {
        initialize(title, headerList);
    }

    /**
     * 添加数据（通过annotation.ExportField添加数据）
     *
     * @return list 数据列表
     */
    public <E> ExportExcel setDataList(List<E> list) {
        for (E e : list) {
            int colunm = 0;
            Row row = this.addRow();
            StringBuilder sb = new StringBuilder();
            for (Object[] os : annotationList) {
                ExcelField ef = (ExcelField) os[0];
                Object val = null;
                // Get entity value
                try {
                    if (StringUtils.isNotBlank(ef.value())) {
                        val = Reflections.invokeGetter(e, ef.value());
                    } else {
                        if (os[1] instanceof Field) {
                            val = Reflections.invokeGetter(e, ((Field) os[1]).getName());
                        } else if (os[1] instanceof Method) {
                            val = Reflections.invokeMethod(e, ((Method) os[1]).getName(), new Class[]{}, new Object[]{});
                        }
                    }
                } catch (Exception ex) {
                    // Failure to ignore
                    log.info(ex.toString());
                    val = "";
                }
                this.addCell(row, colunm++, val, ef.align(), ef.fieldType());
                sb.append(val + ", ");
            }
            log.debug("Write success: [" + row.getRowNum() + "] " + sb.toString());
        }
        return this;
    }

    /**
     * 初始化函数
     *
     * @param title      表格标题，传“空值”，表示无标题
     * @param headerList 表头列表
     */
    private void initialize(String title, List<String> headerList) {
        this.wb = new SXSSFWorkbook(500);
        this.sheet = wb.createSheet("Export");
        this.styles = createStyles(wb);
        // Create title
        if (StringUtils.isNotBlank(title)) {
            Row titleRow = sheet.createRow(rownum++);
            titleRow.setHeightInPoints(30);
            Cell titleCell = titleRow.createCell(0);
            titleCell.setCellStyle(styles.get("title"));
            titleCell.setCellValue(title);
            sheet.addMergedRegion(new CellRangeAddress(titleRow.getRowNum(),
                    titleRow.getRowNum(), titleRow.getRowNum(), headerList.size() - 1));
        }
        // Create header
        if (headerList == null) {
            throw new RuntimeException("headerList not null!");
        }
        Row headerRow = sheet.createRow(rownum++);
        headerRow.setHeightInPoints(16);
        for (int i = 0; i < headerList.size(); i++) {
            Cell cell = headerRow.createCell(i);
            cell.setCellStyle(styles.get("header"));
            String[] ss = StringUtils.split(headerList.get(i), "**", 2);
            if (ss.length == 2) {
                cell.setCellValue(ss[0]);
                Comment comment = this.sheet.createDrawingPatriarch().createCellComment(
                        new XSSFClientAnchor(0, 0, 0, 0, (short) 3, 3, (short) 5, 6));
                comment.setString(new XSSFRichTextString(ss[1]));
                cell.setCellComment(comment);
            } else {
                cell.setCellValue(headerList.get(i));
            }
//            sheet.autoSizeColumn(i);
        }
        for (int i = 0; i < headerList.size(); i++) {
            int colWidth = sheet.getColumnWidth(i) * 2;
            sheet.setColumnWidth(i, colWidth < 3000 ? 3000 : colWidth);
        }
        log.debug("Initialize success.");
    }

    /**
     * 创建表格样式
     *
     * @param wb 工作薄对象
     * @return 样式列表
     */
    private Map<String, CellStyle> createStyles(Workbook wb) {
        Map<String, CellStyle> styles = new HashMap<String, CellStyle>();

        CellStyle style = wb.createCellStyle();
        style.setAlignment(HorizontalAlignment.CENTER);
        style.setVerticalAlignment(VerticalAlignment.CENTER);
        Font titleFont = wb.createFont();
        titleFont.setFontName("Arial");
        titleFont.setFontHeightInPoints((short) 16);
        titleFont.setBold(true);
        style.setFont(titleFont);
        styles.put("title", style);

        style = wb.createCellStyle();
        style.setVerticalAlignment(VerticalAlignment.CENTER);
        style.setBorderRight(BorderStyle.THIN);
        style.setRightBorderColor(IndexedColors.GREY_50_PERCENT.getIndex());
        style.setBorderLeft(BorderStyle.THIN);
        style.setLeftBorderColor(IndexedColors.GREY_50_PERCENT.getIndex());
        style.setBorderTop(BorderStyle.THIN);
        style.setTopBorderColor(IndexedColors.GREY_50_PERCENT.getIndex());
        style.setBorderBottom(BorderStyle.THIN);
        style.setBottomBorderColor(IndexedColors.GREY_50_PERCENT.getIndex());
        Font dataFont = wb.createFont();
        dataFont.setFontName("Arial");
        dataFont.setFontHeightInPoints((short) 10);
        style.setFont(dataFont);
        styles.put("data", style);

        style = wb.createCellStyle();
        style.cloneStyleFrom(styles.get("data"));
        style.setAlignment(HorizontalAlignment.LEFT);
        styles.put("data1", style);

        style = wb.createCellStyle();
        style.cloneStyleFrom(styles.get("data"));
        style.setAlignment(HorizontalAlignment.CENTER);
        styles.put("data2", style);

        style = wb.createCellStyle();
        style.cloneStyleFrom(styles.get("data"));
        style.setAlignment(HorizontalAlignment.RIGHT);
        styles.put("data3", style);

        style = wb.createCellStyle();
        style.cloneStyleFrom(styles.get("data"));
//		style.setWrapText(true);
        style.setAlignment(HorizontalAlignment.CENTER);
        style.setFillForegroundColor(IndexedColors.GREY_50_PERCENT.getIndex());
        style.setFillPattern(FillPatternType.SOLID_FOREGROUND);
        Font headerFont = wb.createFont();
        headerFont.setFontName("Arial");
        headerFont.setFontHeightInPoints((short) 10);
        headerFont.setBold(true);
        headerFont.setColor(IndexedColors.WHITE.getIndex());
        style.setFont(headerFont);
        styles.put("header", style);

        return styles;
    }

    /**
     * 添加一行
     *
     * @return 行对象
     */
    public Row addRow() {
        return sheet.createRow(rownum++);
    }


    /**
     * 添加一个单元格
     *
     * @param row    添加的行
     * @param column 添加列号
     * @param val    添加值
     * @return 单元格对象
     */
    public Cell addCell(Row row, int column, Object val) {
        return this.addCell(row, column, val, 0, Class.class);
    }

    /**
     * 添加一个单元格
     *
     * @param row    添加的行
     * @param column 添加列号
     * @param val    添加值
     * @param align  对齐方式（1：靠左；2：居中；3：靠右）
     * @return 单元格对象
     */
    public Cell addCell(Row row, int column, Object val, int align, Class<?> fieldType) {
        Cell cell = row.createCell(column);
        String cellFormatString = "@";
        try {
            if (val == null) {
                cell.setCellValue("");
            } else if (fieldType != Class.class) {
                cell.setCellValue((String) fieldType.getMethod("setValue", Object.class).invoke(null, val));
            } else {
                if (val instanceof String) {
                    cell.setCellValue((String) val);
                } else if (val instanceof Integer) {
                    cell.setCellValue((Integer) val);
                    cellFormatString = "0";
                } else if (val instanceof Long) {
                    cell.setCellValue((Long) val);
                    cellFormatString = "0";
                } else if (val instanceof Double) {
                    cell.setCellValue((Double) val);
                    cellFormatString = "0.00";
                } else if (val instanceof Float) {
                    cell.setCellValue((Float) val);
                    cellFormatString = "0.00";
                } else if (val instanceof Date) {
                    cell.setCellValue((Date) val);
                    cellFormatString = "yyyy-MM-dd HH:mm";
                } else {
                    cell.setCellValue((String) Class.forName(this.getClass().getName().replaceAll(this.getClass().getSimpleName(),
                            "fieldtype." + val.getClass().getSimpleName() + "Type")).getMethod("setValue", Object.class).invoke(null, val));
                }
            }
//			if (val != null){
            CellStyle style = styles.get("data_column_" + column);
            if (style == null) {
                style = wb.createCellStyle();
                style.cloneStyleFrom(styles.get("data" + (align >= 1 && align <= 3 ? align : "")));
                style.setDataFormat(wb.createDataFormat().getFormat(cellFormatString));
                styles.put("data_column_" + column, style);
            }
            cell.setCellStyle(style);
//			}
        } catch (Exception ex) {
            log.info("Set cell value [" + row.getRowNum() + "," + column + "] error: " + ex.toString());
            cell.setCellValue(val.toString());
        }
        return cell;
    }


    /**
     * 输出数据流
     *
     * @param os 输出数据流
     */
    public ExportExcel write(OutputStream os) throws IOException {
        wb.write(os);
        return this;
    }

    /**
     * 输出到客户端
     *
     * @param fileName 输出文件名
     */
    public ExportExcel write(HttpServletResponse response, String fileName) throws IOException {
        response.reset();
        response.setContentType("application/octet-stream; charset=utf-8");
        response.setHeader("Content-Disposition", "attachment; filename=" + URLEncoder.encode(fileName, "UTF-8"));
        write(response.getOutputStream());
        return this;
    }

    /**
     * 输出到文件
     *
     * @param name 输出文件名
     */
    public ExportExcel writeFile(String name) throws FileNotFoundException, IOException {
        FileOutputStream os = new FileOutputStream(name);
        this.write(os);
        return this;
    }

    /**
     * 清理临时文件
     */
    public ExportExcel dispose() {
        wb.dispose();
        return this;
    }

    /**
     * 导出测试
     */
    public static void main(String[] args) throws Throwable {

        List<String> headerList = Lists.newArrayList();
        for (int i = 1; i <= 10; i++) {
            headerList.add("表头" + i);
        }

        List<String> dataRowList = Lists.newArrayList();
        for (int i = 1; i <= headerList.size(); i++) {
            dataRowList.add("数据" + i);
        }

        List<List<String>> dataList = Lists.newArrayList();
        for (int i = 1; i <= 1000000; i++) {
            dataList.add(dataRowList);
        }

        ExportExcel ee = new ExportExcel("表格标题", headerList);

        for (int i = 0; i < dataList.size(); i++) {
            Row row = ee.addRow();
            for (int j = 0; j < dataList.get(i).size(); j++) {
                ee.addCell(row, j, dataList.get(i).get(j));
            }
        }

        ee.writeFile("target/export.xlsx");

        ee.dispose();

        log.debug("Export success.");

    }

}