/* eslint-disable */
require('script-loader!file-saver');
require('./Blob.js');
require('script-loader!xlsx/dist/xlsx.core.min');

function generateArray(table) {
  const out = [];
  const rows = table.querySelectorAll('tr');
  const ranges = [];
  for (let R = 0; R < rows.length; ++R) {
    const outRow = [];
    const row = rows[R];
    const columns = row.querySelectorAll('td');
    for (let C = 0; C < columns.length; ++C) {
      const cell = columns[C];
      let colspan = cell.getAttribute('colspan');
      let rowspan = cell.getAttribute('rowspan');
      let 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 (let 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 (let k = 0; k < colspan - 1; ++k) outRow.push(null);
    }
    out.push(outRow);
  }
  return [out, ranges];
}

function datenum(v, date1904) {
  if (date1904) v += 1462;
  const 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) {
  const ws = {};
  const range = {s: {c: 10000000, r: 10000000}, e: {c: 0, r: 0}};
  for (let R = 0; R !== data.length; ++R) {
    for (let 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;
      const cell = {v: data[R][C]};
      if (cell.v == null) continue;
      const 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) {
  const buf = new ArrayBuffer(s.length);
  const view = new Uint8Array(buf);
  for (let i = 0; i !== s.length; ++i) view[i] = s.charCodeAt(i) & 0xFF;
  return buf;
}

export function exportTable(id) {
  const theTable = document.getElementById(id);
  console.log('a')
  const oo = generateArray(theTable);
  const ranges = oo[1];

  /* original data */
  const data = oo[0];
  const ws_name = "SheetJS";
  console.log(data);

  const 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;

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

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

function formatJson(jsonData) {
  console.log(jsonData)
}

export function exportJson(th, jsonData, defaultTitle) {

  /* original data */

  const data = jsonData;
  data.unshift(th);
  const ws_name = "SheetJS";

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


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

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

export function excleParseArrays(file, configs) {
  return new Promise((resolve, reject) => {
    const reader = new FileReader();
    reader.onload = (e) => {
      try {
        const data = new Uint8Array(e.target.result);
        const workbook = XLSX.read(data, { type: 'array' });

        // 获取第一个工作表
        const firstSheetName = workbook.SheetNames[0];
        const worksheet = workbook.Sheets[firstSheetName];

        // 转换为 JSON 数组（行数据）
        const jsonData = XLSX.utils.sheet_to_json(worksheet, { header: 1 });

        // 提取表头（第一行）
        const headers = jsonData[0] || [];

        // 验证字段匹配
        if (headers.length !== configs.length) {
          console.warn('Excel列数与配置字段数不一致', headers, configs);
        }

        // 转换数据行为对象数组
        const result = jsonData.slice(1).map(row => {
          const obj = {};
          configs.forEach((field, index) => {
            // 处理列数超出配置的情况
            obj[field] = index < row.length ? row[index] : null;
          });
          return obj;
        });

        resolve(result);
      } catch (error) {
        reject(`解析失败: ${error.message}`);
      }
    };
    reader.onerror = (error) => reject(`文件读取错误: ${error}`);
    reader.readAsArrayBuffer(file);
  });
}
