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/* xlsx.js (C) 2013-present SheetJS -- http://sheetjs.com *//* vim: set ts=2: */import { Component } from '@angular/core';
import * as XLSX from 'xlsx';
import { File } from '@ionic-native/file';
type AOA = any[][];
@Component({  selector: 'page-home',  template: `<ion-header><ion-navbar><ion-title>SheetJS Ionic Demo</ion-title></ion-navbar></ion-header>
<ion-content padding>  <ion-grid>    <ion-row *ngFor="let row of data">      <ion-col *ngFor="let val of row">        {{val}}      </ion-col>    </ion-row>  </ion-grid></ion-content>
<ion-footer>  <input type="file" (change)="onFileChange($event)" multiple="false" />  <button ion-button color="secondary" (click)="import()">Import Data</button>  <button ion-button color="secondary" (click)="export()">Export Data</button></ion-footer>`})
export class HomePage {  data: any[][] = [[1,2,3],[4,5,6]];  constructor(public file: File) {};
  read(bstr: string) {    /* read workbook */    const wb: XLSX.WorkBook = XLSX.read(bstr, {type: 'binary'});
    /* grab first sheet */    const wsname: string = wb.SheetNames[0];    const ws: XLSX.WorkSheet = wb.Sheets[wsname];
    /* save data */    this.data = <AOA>(XLSX.utils.sheet_to_json(ws, {header: 1}));  };
  write(): XLSX.WorkBook {    /* generate worksheet */    const ws: XLSX.WorkSheet = XLSX.utils.aoa_to_sheet(this.data);
    /* generate workbook and add the worksheet */    const wb: XLSX.WorkBook = XLSX.utils.book_new();    XLSX.utils.book_append_sheet(wb, ws, 'SheetJS');
    return wb;  };
  /* File Input element for browser */  onFileChange(evt: any) {    /* wire up file reader */    const target: DataTransfer = <DataTransfer>(evt.target);    if (target.files.length !== 1) throw new Error('Cannot use multiple files');    const reader: FileReader = new FileReader();    reader.onload = (e: any) => {      const bstr: string = e.target.result;      this.read(bstr);    };    reader.readAsBinaryString(target.files[0]);  };
  /* Import button for mobile */  async import() {    try {      const target: string = this.file.documentsDirectory || this.file.externalDataDirectory || this.file.dataDirectory || '';      const dentry = await this.file.resolveDirectoryUrl(target);      const url: string = dentry.nativeURL || '';      alert(`Attempting to read SheetJSIonic.xlsx from ${url}`)      const bstr: string = await this.file.readAsBinaryString(url, "SheetJSIonic.xlsx");      this.read(bstr);    } catch(e) {      const m: string = e.message;      alert(m.match(/It was determined/) ? "Use File Input control" : `Error: ${m}`);    }  };
  /* Export button */  async export() {    const wb: XLSX.WorkBook = this.write();    const filename: string = "SheetJSIonic.xlsx";    try {      /* generate Blob */      const wbout: ArrayBuffer = XLSX.write(wb, { bookType: 'xlsx', type: 'array' });      const blob: Blob = new Blob([wbout], {type: 'application/octet-stream'});
      /* find appropriate path for mobile */      const target: string = this.file.documentsDirectory || this.file.externalDataDirectory || this.file.dataDirectory || '';      const dentry = await this.file.resolveDirectoryUrl(target);      const url: string = dentry.nativeURL || '';
      /* attempt to save blob to file */      await this.file.writeFile(url, filename, blob, {replace: true});      alert(`Wrote to SheetJSIonic.xlsx in ${url}`);    } catch(e) {      if(e.message.match(/It was determined/)) {        /* in the browser, use writeFile */        XLSX.writeFile(wb, filename);      }      else alert(`Error: ${e.message}`);    }  };}