require('script-loader!file-saver')
/* 这里的路径换成自己的 */
require('@/plugins/Blob.js')
require('script-loader!xlsx/dist/xlsx.core.min')

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)
  console.log('a')
  var oo = generateArray(theTable)
  var ranges = oo[1]

  /* original data */
  var data = oo[0]
  var ws_name = 'SheetJS'
  console.log(data)

  var wb = new Workbook(); var 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')
}

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

export function export_json_to_excel(th, jsonData, defaultTitle) {
  /* original data */

  var data = jsonData
  data.unshift(th)
  var ws_name = 'SheetJS'

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

  /* 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' })
  var title = defaultTitle || '列表'
  saveAs(new Blob([s2ab(wbout)], { type: 'application/octet-stream' }), title + '.xlsx')
}
// export default{
// 	export_json_to_excel(th, jsonData, defaultTitle) {

// 	  /* original data */

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

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

// 	  /* 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'});
// 	  var title = defaultTitle || '列表'
// 	  saveAs(new Blob([s2ab(wbout)], {type: "application/octet-stream"}), title + ".xlsx")
// 	},
// 	export_table_to_excel(id) {
// 	  var theTable = document.getElementById(id);
// 	  console.log('a')
// 	  var oo = generateArray(theTable);
// 	  var ranges = oo[1];

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

// 	  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")
// 	}
// }