// Copyright (C) 2003-2026, Foxit Software Inc..
// All Rights Reserved.
//
// http://www.foxitsoftware.com
//
// The following code is copyrighted and contains proprietary information and trade secrets of Foxit Software Inc..
// You cannot distribute any part of Foxit PDF SDK to any third party or general public,
// unless there is a separate license agreement with Foxit Software Inc. which explicitly grants you such rights.
//
// This file contains an example to demonstrate how to use Foxit PDF SDK to get/set page label information
// in a PDF document.


const FSDK = require("@fuxinsoft/foxit-pdf-sdk-node");
const fs = require('fs');
const os = require('os');
const path = require('path');
const util = require('util');

var sn = "Rew1vB0TqoMIxX444UcpScARWdhgJpsJfzmyMLR32a0+EgrCjp2NaQ==";
var key = "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";

const input_path = "../input_files/";
const output_path = "../output_files/";

class TextDoc {
  constructor(file_name, file_mode) {
    this.file_name = file_name;
    this.file_mode = file_mode;
    this.file_stream = fs.openSync(file_name, file_mode);
    if (!this.file_stream) {
      throw new Error('Cannot open file');
    }
  }
  Write(format, ...args) {
    if(!this.file_stream) 
      throw new Error("File not opened");
    let formatted_string = util.format(format, ...args);
    let buffer = new Buffer.from(formatted_string, 'utf-8');
    fs.writeSync(this.file_stream, buffer, 0, buffer.length);
  }
  WriteWithPrefix(count, prefix, format, ...args){
    for (let i = 0; i < count; i++) {
      this.Write(prefix);
    }
    this.Write(format, ...args);
  }
  Close() {
    fs.closeSync(this.file_stream);
    this.file_stream = null;
  }
}

function StyleCodeToString(style) {
  switch (style) {
  case FSDK.PageLabels.e_None: {
    return "None";
               }
  case FSDK.PageLabels.e_DecimalNums: {
    return "DecimalNums";
                  }
  case FSDK.PageLabels.e_UpperRomanNums: {
    return "UpperRomanNums";
                     }
  case FSDK.PageLabels.e_LowerRomanNums: {
    return "LowerRomanNums";
                     }
  case FSDK.PageLabels.e_UpperLetters: {
    return "UpperLetters";
                   }
  case FSDK.PageLabels.e_LowerLetters: {
    return "LowerLetters";
                   }
  }
  return "";
}

function ShowPageLabelsInfo(doc, text_doc_path) {
  let text_doc = new TextDoc(text_doc_path, "w");
  let page_labels = new FSDK.PageLabels(doc);
  let count = doc.GetPageCount();
  for (let i = 0; i < count; i++) {
    text_doc.Write("page index: %d\tstyle: %s\ttitle: %s\tprefix: %s\r\n", i,
      StyleCodeToString(page_labels.GetPageLabelStyle(i)), page_labels.GetPageLabelTitle(i),
      page_labels.GetPageLabelPrefix(i));
  }
}

let error_code = FSDK.Library.Initialize(sn, key);
if (FSDK.e_ErrSuccess != error_code) {
  if (FSDK.e_ErrInvalidLicense == error_code)
    console.log("[Failed] Current used Foxit PDF SDK key information is invalid.");
  else
    console.log("Library Initialize Error: %d", FSDK.e_ErrSuccess);
  return;
}

let output_directory = output_path + "page_labels/";
if (!fs.existsSync(output_directory))  {
  fs.mkdirSync(output_directory);
}

let input_file = input_path + "page_labels.pdf";

try {
  let doc = new FSDK.PDFDoc(input_file);
  let code = doc.Load("");
  if (code != FSDK.e_ErrSuccess) {
    console.log("The Doc [%s] Error: %d\n", input_file, error_code);
    return;
  }
  let text_path = output_directory + "page_labels_original_page_labels_info.txt";
  ShowPageLabelsInfo(doc, text_path);

  // Add new page labels
  let page_labels = new FSDK.PageLabels(doc);
  page_labels.RemoveAll();
  let pdf_removeall = output_directory + "removeall_page_labels.pdf";
  doc.SaveAs(pdf_removeall,  FSDK.PDFDoc.e_SaveFlagNoOriginal);

  let count = doc.GetPageCount();
  if (count > 0) {
    page_labels.SetPageLabel(0, FSDK.PageLabels.e_UpperRomanNums, 1, "Cover-");
  }
  if (count > 1) {
    page_labels.SetPageLabel(1, FSDK.PageLabels.e_LowerRomanNums, 1, "Catolog-");
  }
  if (count > 2) {
    page_labels.SetPageLabel(2, FSDK.PageLabels.e_DecimalNums, 1, "Contents-");
  }
  if (count > 5) {
    page_labels.SetPageLabel(count - 1, FSDK.PageLabels.e_UpperLetters, 1, "Appendix-");
  }

  let text_path_new = output_directory + "page_labels_new_page_labels_info.txt";
  ShowPageLabelsInfo(doc, text_path_new);
  let pdf_new = output_directory + "new_page_labels.pdf";
  doc.SaveAs(pdf_new,  FSDK.PDFDoc.e_SaveFlagNoOriginal);

  console.log("Page label test.");

} catch (e) {
  console.log(e);
}
FSDK.Library.Release();
