package com.framework.util.excel;

import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.lang.reflect.Field;
import java.text.SimpleDateFormat;
import java.util.ArrayList;
import java.util.Collection;
import java.util.Collections;
import java.util.Comparator;
import java.util.Date;
import java.util.Iterator;
import java.util.List;
import java.util.Map;

import org.apache.commons.beanutils.BeanComparator;
import org.apache.commons.collections.CollectionUtils;
import org.apache.commons.collections.ComparatorUtils;
import org.apache.commons.collections.comparators.ComparableComparator;
import org.apache.commons.collections.comparators.ComparatorChain;
import org.apache.commons.lang3.StringUtils;
import org.apache.poi.hssf.usermodel.HSSFCell;
import org.apache.poi.hssf.usermodel.HSSFCellStyle;
import org.apache.poi.hssf.usermodel.HSSFFont;
import org.apache.poi.hssf.usermodel.HSSFRichTextString;
import org.apache.poi.hssf.usermodel.HSSFRow;
import org.apache.poi.hssf.usermodel.HSSFSheet;
import org.apache.poi.hssf.usermodel.HSSFWorkbook;
import org.apache.poi.ss.usermodel.CellStyle;
import org.apache.poi.xssf.usermodel.XSSFCell;
import org.apache.poi.xssf.usermodel.XSSFCellStyle;
import org.apache.poi.xssf.usermodel.XSSFFont;
import org.apache.poi.xssf.usermodel.XSSFRichTextString;
import org.apache.poi.xssf.usermodel.XSSFRow;
import org.apache.poi.xssf.usermodel.XSSFSheet;
import org.apache.poi.xssf.usermodel.XSSFWorkbook;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import com.framework.util.PropertiesLoader;

public class Excel {
    /**
     * 个人加,返回路径
     *
     * @param fileType
     * @param headers
     * @param excels
     * @return
     */
    public static Logger LG = LoggerFactory.getLogger(ExcelUtil.class);

    public final static String excel_format_xls = ".xls";
    public final static String excel_format_xlsx = ".xlsx";
    
    public static <T> String exportExcels(String fileType, String[] headers, List<Collection<T>> excels,String filePath) {
        //String ctxPath = request.getSession().getServletContext().getRealPath("");
        String uploadPath = PropertiesLoader.get("UPLOAD_PATH");

        //String zipReturnPath = "dd/zip/" + UUID.randomUUID().toString() + ".zip";
        List<String> temporaryFilePaths = new ArrayList<>();
        String uploadFilePath = "";
        if (org.springframework.util.CollectionUtils.isEmpty(excels)) {
            return "";
        }
        for (Collection<T> collection : excels) {
            String path = "";
            path += filePath;
            File file = new File(uploadPath + path);
            file.getParentFile().mkdirs();

            // 声明一个工作薄
            if ("xls".equals(fileType)) {
                path += excel_format_xls;
                HSSFWorkbook workbook = new HSSFWorkbook();
                // 生成一个表格
                HSSFSheet sheet = workbook.createSheet();
                //写入数据
                write2XlsSheet(sheet, headers, collection, null, null);
                //生成文件
                try {
                    FileOutputStream fo = new FileOutputStream(uploadPath + path);
                    workbook.write(fo);
                    fo.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            } else {
                path += excel_format_xlsx;
                XSSFWorkbook workbook = new XSSFWorkbook();
                // 生成一个表格
                XSSFSheet sheet = workbook.createSheet();
                //写入数据
                write2XlsxSheet(sheet, headers, collection, null, null);
                //生成文件
                try {
                    FileOutputStream fo = new FileOutputStream(uploadPath + path);
                    workbook.write(fo);
                    fo.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }

            //uploadFilePath
            uploadFilePath = uploadPath + path;
        }
        return uploadFilePath;
    }
    
    /**
     * 每个xlsSheet的写入
     *
     * @param sheet   页签
     * @param headers 表头
     * @param dataset 数据集合
     * @param pattern 日期格式
     */
    private static <T> void write2XlsxSheet(XSSFSheet sheet, String[] headers, Collection<T> dataset,
                                            String pattern, Map<String, Object> colorMap) {
        // 产生表格标题行
        XSSFRow row = sheet.createRow(0);
        for (int i = 0; i < headers.length; i++) {
            XSSFCell cell = row.createCell(i);
            XSSFRichTextString text = new XSSFRichTextString(headers[i]);
            cell.setCellValue(text);
            XSSFFont font = sheet.getWorkbook().createFont();

            font.setFontHeightInPoints((short) 14);//设置字体大小
            XSSFCellStyle style = sheet.getWorkbook().createCellStyle();

            if (colorMap != null && (colorMap.get(text.toString()) != null)) {
                style.setFillForegroundColor((short) colorMap.get(text.toString()));
//                style.setFillPattern(CellStyle.SOLID_FOREGROUND);
            }
            style.setFont(font);
            cell.setCellStyle(style);
        }

        // 遍历集合数据，产生数据行
        Iterator<T> it = dataset.iterator();
        int index = 0;
        while (it.hasNext()) {
            index++;
            row = sheet.createRow(index);
            T t = (T) it.next();
            try {
                if (t instanceof Map) {
                    @SuppressWarnings("unchecked")
                    Map<String, Object> map = (Map<String, Object>) t;
                    int cellNum = 0;
                    for (String k : headers) {
                        if (map.containsKey(k) == false) {
                            LG.error("Map 中 不存在 key [" + k + "]");
                            continue;
                        }
                        Object value = map.get(k);
                        XSSFCell cell = row.createCell(cellNum);
                        cell.setCellValue((value == null || "null".equals(String.valueOf(value))) ? "" : String.valueOf(value));
                        cellNum++;
                    }
                } else {
                    List<FieldForSortting> fields = sortFieldByAnno(t.getClass());
                    int cellNum = 0;
                    for (int i = 0; i < fields.size(); i++) {
                        XSSFCell cell = row.createCell(cellNum);
                        Field field = fields.get(i).getField();
                        field.setAccessible(true);
                        Object value = field.get(t);
                        String textValue = null;
                        if (value instanceof Integer) {
                            int intValue = (Integer) value;
                            cell.setCellValue(intValue);
                        } else if (value instanceof Float) {
                            float fValue = (Float) value;
                            cell.setCellValue(fValue);
                        } else if (value instanceof Double) {
                            double dValue = (Double) value;
                            cell.setCellValue(dValue);
                        } else if (value instanceof Long) {
                            long longValue = (Long) value;
                            cell.setCellValue(longValue);
                        } else if (value instanceof Boolean) {
                            boolean bValue = (Boolean) value;
                            cell.setCellValue(bValue);
                        } else if (value instanceof Date) {
                            Date date = (Date) value;
                            SimpleDateFormat sdf = new SimpleDateFormat(pattern);
                            textValue = sdf.format(date);
                        } else if (value instanceof String[]) {
                            String[] strArr = (String[]) value;
                            for (int j = 0; j < strArr.length; j++) {
                                String str = strArr[j];
                                cell.setCellValue(str);
                                if (j != strArr.length - 1) {
                                    cellNum++;
                                    cell = row.createCell(cellNum);
                                }
                            }
                        } else if (value instanceof Double[]) {
                            Double[] douArr = (Double[]) value;
                            for (int j = 0; j < douArr.length; j++) {
                                Double val = douArr[j];
                                // 资料不为空则set Value
                                if (val != null) {
                                    cell.setCellValue(val);
                                }

                                if (j != douArr.length - 1) {
                                    cellNum++;
                                    cell = row.createCell(cellNum);
                                }
                            }
                        } else {
                            // 其它数据类型都当作字符串简单处理
                            String empty = StringUtils.EMPTY;
                            ExcelCell anno = field.getAnnotation(ExcelCell.class);
                            if (anno != null) {
                                empty = anno.defaultValue();
                            }
                            textValue = value == null ? empty : value.toString();
                        }
                        if (textValue != null) {
                            XSSFRichTextString richString = new XSSFRichTextString(textValue);
                            cell.setCellValue(richString);
                        }

                        cellNum++;
                    }
                }
            } catch (Exception e) {
                LG.error(e.toString(), e);
            }
        }
        // 设定自动宽度
        for (int i = 0; i < headers.length; i++) {
            sheet.autoSizeColumn(i);
        }
    }
    
    /**
     * 每个xlsSheet的写入
     *
     * @param sheet   页签
     * @param headers 表头
     * @param dataset 数据集合
     * @param pattern 日期格式
     */
    private static <T> void write2XlsSheet(HSSFSheet sheet, String[] headers, Collection<T> dataset,
                                           String pattern, Map<String, Object> colorMap) {
        // 产生表格标题行
        HSSFRow row = sheet.createRow(0);
        for (int i = 0; i < headers.length; i++) {
            HSSFCell cell = row.createCell(i);
            HSSFRichTextString text = new HSSFRichTextString(headers[i]);
            cell.setCellValue(text);
            HSSFFont font = sheet.getWorkbook().createFont();
            //font.setFontName("Consolas");
            //font.setBoldweight(HSSFFont.BOLDWEIGHT_BOLD);
            font.setFontHeightInPoints((short) 14);//设置字体大小
            HSSFCellStyle style = sheet.getWorkbook().createCellStyle();
            style.setFont(font);
            if (colorMap != null && (colorMap.get(text.toString()) != null)) {
                style.setFillForegroundColor((short) colorMap.get(text.toString()));
//                style.setFillPattern(CellStyle.SOLID_FOREGROUND);
            }
            cell.setCellStyle(style);
        }

        // 遍历集合数据，产生数据行
        Iterator<T> it = dataset.iterator();
        int index = 0;
        while (it.hasNext()) {
            index++;
            row = sheet.createRow(index);
            T t = (T) it.next();
            try {
                if (t instanceof Map) {
                    @SuppressWarnings("unchecked")
                    Map<String, Object> map = (Map<String, Object>) t;
                    int cellNum = 0;
                    for (String k : headers) {
                        if (map.containsKey(k) == false) {
                            LG.error("Map 中 不存在 key [" + k + "]");
                            continue;
                        }
                        Object value = map.get(k);
                        HSSFCell cell = row.createCell(cellNum);
                        cell.setCellValue((value == null || "null".equals(String.valueOf(value))) ? "" : String.valueOf(value));
                        cellNum++;
                    }
                } else {
                    List<FieldForSortting> fields = sortFieldByAnno(t.getClass());
                    int cellNum = 0;
                    for (int i = 0; i < fields.size(); i++) {
                        HSSFCell cell = row.createCell(cellNum);
                        Field field = fields.get(i).getField();
                        field.setAccessible(true);
                        Object value = field.get(t);
                        String textValue = null;
                        if (value instanceof Integer) {
                            int intValue = (Integer) value;
                            cell.setCellValue(intValue);
                        } else if (value instanceof Float) {
                            float fValue = (Float) value;
                            cell.setCellValue(fValue);
                        } else if (value instanceof Double) {
                            double dValue = (Double) value;
                            cell.setCellValue(dValue);
                        } else if (value instanceof Long) {
                            long longValue = (Long) value;
                            cell.setCellValue(longValue);
                        } else if (value instanceof Boolean) {
                            boolean bValue = (Boolean) value;
                            cell.setCellValue(bValue);
                        } else if (value instanceof Date) {
                            Date date = (Date) value;
                            SimpleDateFormat sdf = new SimpleDateFormat(pattern);
                            textValue = sdf.format(date);
                        } else if (value instanceof String[]) {
                            String[] strArr = (String[]) value;
                            for (int j = 0; j < strArr.length; j++) {
                                String str = strArr[j];
                                cell.setCellValue(str);
                                if (j != strArr.length - 1) {
                                    cellNum++;
                                    cell = row.createCell(cellNum);
                                }
                            }
                        } else if (value instanceof Double[]) {
                            Double[] douArr = (Double[]) value;
                            for (int j = 0; j < douArr.length; j++) {
                                Double val = douArr[j];
                                // 资料不为空则set Value
                                if (val != null) {
                                    cell.setCellValue(val);
                                }

                                if (j != douArr.length - 1) {
                                    cellNum++;
                                    cell = row.createCell(cellNum);
                                }
                            }
                        } else {
                            // 其它数据类型都当作字符串简单处理
                            String empty = StringUtils.EMPTY;
                            ExcelCell anno = field.getAnnotation(ExcelCell.class);
                            if (anno != null) {
                                empty = anno.defaultValue();
                            }
                            textValue = value == null ? empty : value.toString();
                        }
                        if (textValue != null) {
                            HSSFRichTextString richString = new HSSFRichTextString(textValue);
                            cell.setCellValue(richString);
                        }

                        cellNum++;
                    }
                }
            } catch (Exception e) {
                LG.error(e.toString(), e);
            }
        }
        // 设定自动宽度
        for (int i = 0; i < headers.length; i++) {
            sheet.autoSizeColumn(i);
        }
    }
    
    /**
     * 根据annotation的seq排序后的栏位
     *
     * @param clazz
     * @return
     */
    private static List<FieldForSortting> sortFieldByAnno(Class<?> clazz) {
        Field[] fieldsArr = clazz.getDeclaredFields();
        List<FieldForSortting> fields = new ArrayList<FieldForSortting>();
        List<FieldForSortting> annoNullFields = new ArrayList<FieldForSortting>();
        for (Field field : fieldsArr) {
            ExcelCell ec = field.getAnnotation(ExcelCell.class);
            if (ec == null) {
                // 没有ExcelCell Annotation 视为不汇入
                continue;
            }
            int id = ec.index();
            fields.add(new FieldForSortting(field, id));
        }
        fields.addAll(annoNullFields);
        sortByProperties(fields, true, false, "index");
        return fields;
    }
    @SuppressWarnings("unchecked")
    private static void sortByProperties(List<? extends Object> list, boolean isNullHigh,
                                         boolean isReversed, String... props) {
        if (CollectionUtils.isNotEmpty(list)) {
            Comparator<?> typeComp = ComparableComparator.getInstance();
            if (isNullHigh == true) {
                typeComp = ComparatorUtils.nullHighComparator(typeComp);
            } else {
                typeComp = ComparatorUtils.nullLowComparator(typeComp);
            }
            if (isReversed) {
                typeComp = ComparatorUtils.reversedComparator(typeComp);
            }

            List<Object> sortCols = new ArrayList<Object>();

            if (props != null) {
                for (String prop : props) {
                    sortCols.add(new BeanComparator(prop, typeComp));
                }
            }
            if (sortCols.size() > 0) {
                Comparator<Object> sortChain = new ComparatorChain(sortCols);
                Collections.sort(list, sortChain);
            }
        }
    }
}