// 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("@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/";

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();