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

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], t: 's' };
            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 (typeof cell.v === 'object') {
                cell.t = 'o';
                cell.v = JSON.stringify(cell.v);
                cell.h = 'o';
            }
            else if (cell.v instanceof Date) {
                cell.t = 'n';
                cell.z = XLSX.SSF._table[14];
                cell.v = datenum(cell.v);
            }

            ws[cell_ref] = cell;
        }
    }
    if (range.s.c < 10000000) ws['!ref'] = XLSX.utils.encode_range(range);
    return ws;
}
function encode_row(row) { return "" + (row + 1); };
function encode_col(col) { var s = ""; for (++col; col; col = Math.floor((col - 1) / 26)) s = String.fromCharCode(((col - 1) % 26) + 65) + s; return s; }
function safe_format_cell(cell, v) {
    var q = (cell.t == 'd' && v instanceof Date);
    if (cell.z != null) try { return (cell.w = SSF.format(cell.z, q ? datenum(v) : v)); } catch (e) { }
    try { return (cell.w = SSF.format((cell.XF || {}).numFmtId || (q ? 14 : 0), q ? datenum(v) : v)); } catch (e) { return '' + v; }
}

function format_cell(cell, v, o) {
    if (cell == null || cell.t == null || cell.t == 'z') return '';
    if (cell.t == 'b' || cell.t == 'n') return cell.v;
    if (cell.t == 'o') return JSON.parse(cell.v);
    if (cell.w !== undefined) return cell.w;
    // if (cell.v !== undefined) return cell.v;
    if (v == undefined) return safe_format_cell(cell, cell.v);
    return safe_format_cell(cell, v);
}

export function sheet_to_json(sheet, opts) {
    if (sheet == null || sheet["!ref"] == null) return [];
    var val = { t: 'n', v: 0 }, header = 0, offset = 1, hdr = [], isempty = true, v = 0, vv = "";
    var r = { s: { r: 0, c: 0 }, e: { r: 0, c: 0 } };
    var o = opts || {};
    var raw = o.raw;
    var defval = o.defval;
    var range = o.range != null ? o.range : sheet["!ref"];
    if (o.header === 1) header = 1;
    else if (o.header === "A") header = 2;
    else if (Array.isArray(o.header)) header = 3;
    switch (typeof range) {
        case 'string': r = safe_decode_range(range); break;
        case 'number': r = safe_decode_range(sheet["!ref"]); r.s.r = range; break;
        default: r = range;
    }
    if (header > 0) offset = 0;
    var rr = encode_row(r.s.r);
    var cols = [];
    var out = [];
    var outi = 0, counter = 0;
    var dense = Array.isArray(sheet);
    var R = r.s.r, C = 0, CC = 0;
    if (dense && !sheet[R]) sheet[R] = [];
    for (C = r.s.c; C <= r.e.c; ++C) {
        cols[C] = encode_col(C);
        val = dense ? sheet[R][C] : sheet[cols[C] + rr];
        switch (header) {
            case 1: hdr[C] = C - r.s.c; break;
            case 2: hdr[C] = cols[C]; break;
            case 3: hdr[C] = o.header[C - r.s.c]; break;
            default:
                if (val == null) val = { w: "__EMPTY", t: "s" };
                vv = v = format_cell(val, null, o);
                counter = 0;
                for (CC = 0; CC < hdr.length; ++CC) if (hdr[CC] == vv) vv = v + "_" + (++counter);
                hdr[C] = vv;
        }
    }
    var row = (header === 1) ? [] : {};
    for (R = r.s.r + offset; R <= r.e.r; ++R) {
        rr = encode_row(R);
        isempty = true;
        if (header === 1) row = [];
        else {
            row = {};
            if (Object.defineProperty) try { Object.defineProperty(row, '__rowNum__', { value: R, enumerable: false }); } catch (e) { row.__rowNum__ = R; }
            else row.__rowNum__ = R;
        }
        if (!dense || sheet[R]) for (C = r.s.c; C <= r.e.c; ++C) {
            val = dense ? sheet[R][C] : sheet[cols[C] + rr];
            if (val === undefined || val.t === undefined) {
                if (defval === undefined) continue;
                if (hdr[C] != null) { row[hdr[C]] = defval; }
                continue;
            }
            v = val.v;
            switch (val.t) {
                case 'z': if (v == null) break; continue;
                case 'e': v = void 0; break;
                case 's': case 'd': case 'b': case 'n': break;
                default: throw new Error('unrecognized type ' + val.t);
            }
            if (hdr[C] != null) {
                if (v == null) {
                    if (defval !== undefined) row[hdr[C]] = defval;
                    else if (raw && v === null) row[hdr[C]] = null;
                    else continue;
                } else {
                    row[hdr[C]] = raw ? v : format_cell(val, v, o);
                }
                if (v != null) isempty = false;
            }
        }
        if ((isempty === false) || (header === 1 ? o.blankrows !== false : !!o.blankrows)) out[outi++] = row;
    }
    out.length = outi;
    return out;
}
function safe_decode_range(range) {
    var o = { s: { c: 0, r: 0 }, e: { c: 0, r: 0 } };
    var idx = 0, i = 0, cc = 0;
    var len = range.length;
    for (idx = 0; i < len; ++i) {
        if ((cc = range.charCodeAt(i) - 64) < 1 || cc > 26) break;
        idx = 26 * idx + cc;
    }
    o.s.c = --idx;

    for (idx = 0; i < len; ++i) {
        if ((cc = range.charCodeAt(i) - 48) < 0 || cc > 9) break;
        idx = 10 * idx + cc;
    }
    o.s.r = --idx;

    if (i === len || range.charCodeAt(++i) === 58) { o.e.c = o.s.c; o.e.r = o.s.r; return o; }

    for (idx = 0; i != len; ++i) {
        if ((cc = range.charCodeAt(i) - 64) < 1 || cc > 26) break;
        idx = 26 * idx + cc;
    }
    o.e.c = --idx;

    for (idx = 0; i != len; ++i) {
        if ((cc = range.charCodeAt(i) - 48) < 0 || cc > 9) break;
        idx = 10 * idx + cc;
    }
    o.e.r = --idx;
    return o;
}

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_json_to_excel(th, jsonData, defaultTitle) {
    var data = jsonData;
    data.unshift(th);
    var ws_name = "SheetJS";

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

    wb.SheetNames.push(ws_name);
    wb.Sheets[ws_name] = ws;

    var wbout = XLSX.write(wb, { bookType: 'xlsx', bookSST: false, type: 'binary' });
    var title = defaultTitle || '列表'
    saveAs(new Blob([s2ab(wbout)], { type: "application/octet-stream" }), title + ".xlsx")
}