// 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 extract attached files from PDF files and
// add files as attachments to PDF files.

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

var sn = "bPxThFlBAYifO3yiW0C51bKbjPap1zHaf5aG5sX378TjFvB7Q0802A==";
var key = "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";

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

function DateTimeToString(datetime) {  
  const pad = number => (number < 10 ? '0' + number : String(number));
  const offsetSign = datetime.utc_hour_offset >= 0 ? '+' : '-'; 
  const hourOffset = Math.abs(datetime.utc_hour_offset);
  const minuteOffset = Math.abs(datetime.utc_minute_offset);
  return `${pad(datetime.year)}/${pad(datetime.month)}/${pad(datetime.day)}-${pad(datetime.hour)}:${pad(datetime.minute)}:${pad(datetime.second)} ${offsetSign}${pad(hourOffset)}:${pad(minuteOffset)}`;
}

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;
  }
}

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 + "attachment/";
if (!fs.existsSync(output_directory)) {
  fs.mkdirSync(output_directory);
}


let input_file = input_path + "attachment.pdf"
let file_info = output_directory + "attachMent_info.txt"

try {
  let doc = new FSDK.PDFDoc(input_file);
  let error_code = doc.Load("");
  if (error_code != FSDK.e_ErrSuccess) {
    console.log("The Doc [%s] Error: %d\n", input_file, error_code);
    return 1;
  }

  {
    // Get information of attachments.
    let tree = new FSDK.PDFNameTree();
    let attachments = new FSDK.Attachments(doc, tree);
    let text_doc = new TextDoc(file_info, "w");
    let count = attachments.GetCount();
    for (var i = 0; i < count; i++) {
      let key = attachments.GetKey(i);
      text_doc.Write("key:\t\t%s\r\n", key);

      var file_spec = attachments.GetEmbeddedFile(key);
      if (!file_spec.IsEmpty()) {
        let name = file_spec.GetFileName();
        text_doc.Write("Name:\t\t%s\r\n", name);
        text_doc.Write("Size:\t\t%d\r\n", file_spec.GetFileSize());
        text_doc.Write("Is embedded:\t%s\r\n", file_spec.IsEmbedded() ? "true" : "false");
        text_doc.Write("Creation time:\t%s\r\n", DateTimeToString(file_spec.GetCreationDateTime()));
        text_doc.Write("Modified time:\t%s\r\n", DateTimeToString(file_spec.GetModifiedDateTime()));
        text_doc.Write("\r\n");

        if (file_spec.IsEmbedded()) {
          let exFilePath = output_directory + name;
          let bExportStatus = file_spec.ExportToFile(exFilePath);
          console.log("ExportToFile %s %s", name, bExportStatus ? "successful" : "failed");          
        }
      }
    }
  }
  {
    let tree = new FSDK.PDFNameTree();
    // Remove all attachments
    let attachment = new FSDK.Attachments(doc, tree);
    attachment.RemoveAllEmbeddedFiles();
    let newPdf = output_directory + "attachment_remove.pdf";
    doc.SaveAs(newPdf, FSDK.PDFDoc.e_SaveFlagNoOriginal);
    console.log("Remove all attachments.");

  }
  {
    let tree = new FSDK.PDFNameTree();
    let text_path = input_path + "AboutFoxit.pdf";
    let attachment = new FSDK.Attachments(doc, tree);
    // Add a new attachment to PDF document.
    attachment.AddFromFilePath("LOriginalAttachmentsInfo", text_path);
    let newPdf = output_directory + "attachment_add.pdf";
    doc.SaveAs(newPdf, FSDK.PDFDoc.e_SaveFlagNoOriginal);
    console.log("Add a new attachment to PDF document.");
  }
} catch (e) {
  console.log(e);
}
FSDK.Library.Release();