/* eslint-disable */
require('script-loader!file-saver');
require('script-loader!./Blob');
import XLSX from 'xlsx'

function generateArray(table) {
    var out = [];
    var rows = table.querySelectorAll('tr');
    var ranges = [];
    for (var R = 0; R < rows.length; ++R) {
        var outRow = [];
        var row = rows[R];
        var columns = row.querySelectorAll('td');
        for (var C = 0; C < columns.length; ++C) {
            var cell = columns[C];
            var colspan = cell.getAttribute('colspan');
            var rowspan = cell.getAttribute('rowspan');
            var cellValue = cell.innerText;
            if (cellValue !== "" && cellValue == +cellValue) cellValue = +cellValue;

            //Skip ranges
            ranges.forEach(function (range) {
                if (R >= range.s.r && R <= range.e.r && outRow.length >= range.s.c && outRow.length <= range.e.c) {
                    for (var i = 0; i <= range.e.c - range.s.c; ++i) outRow.push(null);
                }
            });

            //Handle Row Span
            if (rowspan || colspan) {
                rowspan = rowspan || 1;
                colspan = colspan || 1;
                ranges.push({s: {r: R, c: outRow.length}, e: {r: R + rowspan - 1, c: outRow.length + colspan - 1}});
            }
            ;

            //Handle Value
            outRow.push(cellValue !== "" ? cellValue : null);

            //Handle Colspan
            if (colspan) for (var k = 0; k < colspan - 1; ++k) outRow.push(null);
        }
        out.push(outRow);
    }
    return [out, ranges];
};

function datenum(v, date1904) {
    if (date1904) v += 1462;
    var epoch = Date.parse(v);
    return (epoch - new Date(Date.UTC(1899, 11, 30))) / (24 * 60 * 60 * 1000);
}

function sheet_from_array_of_arrays(data, opts) {
    var ws = {};
    var range = {s: {c: 10000000, r: 10000000}, e: {c: 0, r: 0}};
    for (var R = 0; R != data.length; ++R) {
        for (var C = 0; C != data[R].length; ++C) {
            if (range.s.r > R) range.s.r = R;
            if (range.s.c > C) range.s.c = C;
            if (range.e.r < R) range.e.r = R;
            if (range.e.c < C) range.e.c = C;
            var cell = {v: data[R][C]};
            if (cell.v == null) continue;
            var cell_ref = XLSX.utils.encode_cell({c: C, r: R});

            if (typeof cell.v === 'number') cell.t = 'n';
            else if (typeof cell.v === 'boolean') cell.t = 'b';
            else if (cell.v instanceof Date) {
                cell.t = 'n';
                cell.z = XLSX.SSF._table[14];
                cell.v = datenum(cell.v);
            }
            else cell.t = 's';

            ws[cell_ref] = cell;
        }
    }
    if (range.s.c < 10000000) ws['!ref'] = XLSX.utils.encode_range(range);
    return ws;
}

function Workbook() {
    if (!(this instanceof Workbook)) return new Workbook();
    this.SheetNames = [];
    this.Sheets = {};
}

function s2ab(s) {
    var buf = new ArrayBuffer(s.length);
    var view = new Uint8Array(buf);
    for (var i = 0; i != s.length; ++i) view[i] = s.charCodeAt(i) & 0xFF;
    return buf;
}

export function export_table_to_excel(id) {
    var theTable = document.getElementById(id);
    var oo = generateArray(theTable);
    var ranges = oo[1];

    /* original data */
    var data = oo[0];
    var ws_name = "SheetJS";

    var wb = new Workbook(), ws = sheet_from_array_of_arrays(data);

    /* add ranges to worksheet */
    // ws['!cols'] = ['apple', 'banan'];
    ws['!merges'] = ranges;

    /* add worksheet to workbook */
    wb.SheetNames.push(ws_name);
    wb.Sheets[ws_name] = ws;

    var wbout = XLSX.write(wb, {bookType: 'xlsx', bookSST: false, type: 'binary'});

    saveAs(new Blob([s2ab(wbout)], {type: "application/octet-stream"}), "test.xlsx")
}


export function export_json_to_excel({
  multiHeader2 = [], // 第一行表头
  multiHeader = [], // 第二行表头
  header, // 第三行表头
  data,
  filename, //文件名
  merges = [], // 合并
  autoWidth = true,
  bookType = "xlsx",
  myRowFont = ["1"],
  tableheader = tableheader
} = {}) {
    /* original data */
    filename = filename || "列表";
    data = [...data];
    if (header != []) {
        data.unshift(header);
    }

    for (let i = multiHeader2.length - 1; i > -1; i--) {
        data.unshift(multiHeader2[i]);
    }

    for (let i = multiHeader.length - 1; i > -1; i--) {
        data.unshift(multiHeader[i]);
    }
    //
    var ws_name = "SheetJS";
    var wb = new Workbook(),
        ws = sheet_from_array_of_arrays(data);

    if (merges.length > 0) {
        if (!ws["!merges"]) ws["!merges"] = [];
        merges.forEach(item => {
            ws["!merges"].push(XLSX.utils.decode_range(item));
        });
    }
    if (autoWidth) {
        /*设置worksheet每列的最大宽度*/
        const colWidth = data.map(row =>
            row.map(val => {
                /*先判断是否为null/undefined*/
                if (val == null) {
                    return {
                        wch: 20
                    };
                } else if (val.toString().charCodeAt(0) > 255) {
                    /*再判断是否为中文*/
                    return {
                        wch: val.toString().length * 2
                    };
                } else {
                    return {
                        wch: val.toString().length
                    };
                }
            })
        );
        /*以第一行为初始值*/
        let result = colWidth[0];
        for (let i = 1; i < colWidth.length; i++) {
            for (let j = 0; j < colWidth[i].length; j++) {
                if (result[j] != undefined) {
                    if (result[j]["wch"] < colWidth[i][j]["wch"]) {
                        result[j]["wch"] = colWidth[i][j]["wch"];
                    }
                }
            }
        }
        ws["!cols"] = result;
    }

    /* add worksheet to workbook */
    wb.SheetNames.push(ws_name);
    wb.Sheets[ws_name] = ws;
    var dataInfo = wb.Sheets[wb.SheetNames[0]];

    //设置主标题样式
    // dataInfo["A1"].s = {
    //   font: {
    //     name: '宋体',
    //     sz: 18,
    //     color: {rgb: "ff0000"},
    //     border:true
    //   },
    //   alignment: {
    //     horizontal: "center",
    //     vertical: "center",
    //   },
    //   fill: {
    //     fgColor: {rgb: "FFFFFF"},
    //   },
    // };
    // 这是表头行的样式
    var tableTitleFont = {
        font: {
            name: "宋体",
            // color: {rgb: "ff0000"},
            bold: true
        },
        alignment: {
            horizontal: "center",
            vertical: "center"
        }
    };
    if (tableheader == undefined) {
        for (var b in dataInfo) {
            if (b.indexOf(myRowFont) > -1) {
                if (b.length == 2) {
                    dataInfo[b].s = tableTitleFont;
                }
            }
        }
    }
    if (tableheader == "2") {
        for (var b in dataInfo) {
            if (b.indexOf("1") > -1 || b.indexOf("2") > -1) {
                if (b.length == 2) {
                    dataInfo[b].s = tableTitleFont;
                }
            }
        }
    }

    var wbout = XLSX.write(wb, {
        bookType: bookType,
        bookSST: false,
        type: "binary"
    });
    saveAs(
        new Blob([s2ab(wbout)], {
            type: "application/octet-stream"
        }),
        `${filename}.${bookType}`
    );
}