// 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 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 add watermarks (in different types)
// into 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 AddTextWatermark(doc, page) {
  let settings = new FSDK.WatermarkSettings();
  settings.flags = FSDK.WatermarkSettings.e_FlagASPageContents | FSDK.WatermarkSettings.e_FlagOnTop;
  settings.offset_x = 0;
  settings.offset_y = 0;
  settings.opacity = 90;
  settings.position = FSDK.e_PosTopRight;
  settings.rotation = -45.0;
  settings.scale_x = 1.0;
  settings.scale_y = 1.0;

  let text_properties = new FSDK.WatermarkTextProperties();
  text_properties.alignment = FSDK.e_AlignmentCenter;
  text_properties.color = 0xF68C21;
  text_properties.font_style = FSDK.WatermarkTextProperties.e_FontStyleNormal;
  text_properties.line_space = 1;
  text_properties.font_size = 12.0;
  text_properties.font = new FSDK.Font(FSDK.Font.e_StdIDTimesB);

  let watermark = new FSDK.Watermark(doc, "Foxit PDF SDK\nwww.foxitsoftware.com", text_properties, settings);
  watermark.InsertToPage(page);

}

function AddBitmapWatermark(doc, page, bitmap_file) {
  let settings = new FSDK.WatermarkSettings();
  settings.flags = FSDK.WatermarkSettings.e_FlagASPageContents | FSDK.WatermarkSettings.e_FlagOnTop;
  settings.offset_x = 0.0;
  settings.offset_y = 0.0;
  settings.opacity = 60;
  settings.position = FSDK.e_PosCenterLeft;
  settings.rotation = 90.0;

  let image = new FSDK.Image(bitmap_file);
  let bitmap = image.GetFrameBitmap(0);
  settings.scale_x = page.GetHeight() * 1.0 / bitmap.GetWidth();
  settings.scale_y = settings.scale_x;
  let watermark = new FSDK.Watermark(doc, bitmap, settings);
  watermark.InsertToPage(page);
}

function AddImageWatermark(doc, page, image_file) {
  let settings = new FSDK.WatermarkSettings();
  settings.flags = FSDK.WatermarkSettings.e_FlagASPageContents | FSDK.WatermarkSettings.e_FlagOnTop;
  settings.offset_x = 0.0;
  settings.offset_y = 0.0;
  settings.opacity = 20;
  settings.position = FSDK.e_PosCenter;
  settings.rotation = 0.0;

  let image = new FSDK.Image(image_file);
  let bitmap = image.GetFrameBitmap(0);
  settings.scale_x = page.GetWidth() * 0.618 / bitmap.GetWidth();
  settings.scale_y = settings.scale_x;

  let watermark = new FSDK.Watermark(doc, image, 0, settings);
  watermark.InsertToPage(page);
}

function AddSingleWatermark(doc, page) {
  let settings = new FSDK.WatermarkSettings();
  settings.flags = FSDK.WatermarkSettings.e_FlagASPageContents|FSDK.WatermarkSettings.e_FlagOnTop;
  settings.offset_x = 0.0;
  settings.offset_y = 0.0;
  settings.opacity = 90;
  settings.position = FSDK.e_PosBottomRight;
  settings.rotation = 0.0;
  settings.scale_x = 0.1;
  settings.scale_y = 0.1;

  let watermark = new FSDK.Watermark(doc, page, settings);
  watermark.InsertToPage(page);
}

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

let input_file = input_path + "AboutFoxit.pdf";
let output_file = output_directory + "watermark_add.pdf";
let output_remove_file = output_directory + "watermark_remove.pdf";


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;
  }
  let page_count = doc.GetPageCount();
  for(let i=0; i<page_count; i++)
  {
    let page = doc.GetPage(i);
    page.StartParse(FSDK.PDFPage.e_ParsePageNormal, null, false);

    AddTextWatermark(doc, page);
    let wm_bmp = input_path + "watermark.bmp";
    AddBitmapWatermark(doc, page,wm_bmp );
    let wm_image = input_path + "sdk.png";
    AddImageWatermark(doc, page, wm_image);
    AddSingleWatermark(doc, page);
  }

  doc.SaveAs(output_file, FSDK.PDFDoc.e_SaveFlagNoOriginal);
  console.log("Add watermarks to PDF file.");

  let nCount = doc.GetPageCount();
  for (let i = 0; i < nCount; i++)
  {
    let page = doc.GetPage(i);
    page.StartParse(FSDK.PDFPage.e_ParsePageNormal, null, false);
    if (page.HasWatermark()) {
      page.RemoveAllWatermarks();
    }
  }

  doc.SaveAs(output_remove_file, FSDK.PDFDoc.e_SaveFlagNoOriginal);
  console.log("Remove watermarks from PDF file.");

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