// 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.

using System;
using System.IO;

using foxit.common;
using foxit.pdf;

namespace watermarkCS
{
    class watermark
    {
        const string sn = "Rew1vB0TqoMIxX444UcpScARWdhgJpsJfzmyMLR32a0+EgrCjp2NaQ==";
        const string key = "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";

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

        const string input_file = input_path + "AboutFoxit.pdf";
        const string output_file = output_path + "watermark_add.pdf";
        const string output_remove_file = output_path + "watermark_remove.pdf";

        private static void CreateResultFolder(string output_path)
        {
            if (!Directory.Exists(output_path))
            {
                Directory.CreateDirectory(output_path);
            }
        }

        static void AddTextWatermark(PDFDoc doc, PDFPage page)
        {
            using (var settings = new WatermarkSettings())
            {
                settings.flags = (int)(WatermarkSettings.Flags.e_FlagASPageContents | WatermarkSettings.Flags.e_FlagOnTop);
                settings.offset_x = 0;
                settings.offset_y = 0;
                settings.opacity = 90;
                settings.position = Position.e_PosTopRight;
                settings.rotation = -45.0f;
                settings.scale_x = 1.0f;
                settings.scale_y = 1.0f;

                using (var font = new Font(Font.StandardID.e_StdIDTimesB))
                {
                    using (var text_properties = new WatermarkTextProperties())
                    {
                        text_properties.alignment = Alignment.e_AlignmentCenter;
                        text_properties.color = 0xF68C21;
                        text_properties.font_style = WatermarkTextProperties.FontStyle.e_FontStyleNormal;
                        text_properties.line_space = 1;
                        text_properties.font_size = 12.0f;
                        text_properties.font = font;

                        using (var watermark = new Watermark(doc, "Foxit PDF SDK\nwww.foxitsoftware.com", text_properties, settings))
                        {
                            watermark.InsertToPage(page);
                        }
                    }
                }
            }

        }

        static void AddBitmapWatermark(PDFDoc doc, PDFPage page, string bitmap_file)
        {
            using (var settings = new WatermarkSettings())
            {
                settings.flags = (int)(WatermarkSettings.Flags.e_FlagASPageContents | WatermarkSettings.Flags.e_FlagOnTop);
                settings.offset_x = 0.0f;
                settings.offset_y = 0.0f;
                settings.opacity = 60;
                settings.position = Position.e_PosCenterLeft;
                settings.rotation = 90.0f;

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


        static void AddImageWatermark(PDFDoc doc, PDFPage page, string image_file)
        {
            using (var settings = new WatermarkSettings())
            {
                settings.flags = (int)(WatermarkSettings.Flags.e_FlagASPageContents | WatermarkSettings.Flags.e_FlagOnTop);
                settings.offset_x = 0.0f;
                settings.offset_y = 0.0f;
                settings.opacity = 20;
                settings.position = Position.e_PosCenter;
                settings.rotation = 0.0f;

                using (var image = new Image(image_file))
                {
                    using (var bitmap = image.GetFrameBitmap(0))
                    {
                        settings.scale_x = page.GetWidth() * 0.618f / bitmap.GetWidth();
                        settings.scale_y = settings.scale_x;

                        using (var watermark = new Watermark(doc, image, 0, settings))
                        {
                            watermark.InsertToPage(page);
                        }
                    }
                }
            }
        }

        static void AddSingleWatermark(PDFDoc doc, PDFPage page)
        {
            using (var settings = new WatermarkSettings())
            {
                settings.flags = (int)(WatermarkSettings.Flags.e_FlagASPageContents | WatermarkSettings.Flags.e_FlagOnTop);
                settings.offset_x = 0.0f;
                settings.offset_y = 0.0f;
                settings.opacity = 90;
                settings.position = Position.e_PosBottomRight;
                settings.rotation = 0.0f;
                settings.scale_x = 0.1f;
                settings.scale_y = 0.1f;
                using (var watermark = new Watermark(doc, page, settings))
                {
                    watermark.InsertToPage(page);
                }
            }
        }

        static void Main(string[] args)
        {
            CreateResultFolder(output_path);
            // Initialize library
            ErrorCode error_code = Library.Initialize(sn, key);
            if (error_code != ErrorCode.e_ErrSuccess)
            {
                Console.WriteLine("Library Initialize Error: {0}", error_code);
                return;
            }

            try
            {
                using (var doc = new PDFDoc(input_file))
                {
                    error_code = doc.Load(null);

                    if (error_code != ErrorCode.e_ErrSuccess)
                    {
                        Console.WriteLine("The PDFDoc " + input_file + " Error: " + error_code);
                        return;
                    }
                    int nCount = doc.GetPageCount();
                    for (int i = 0; i < nCount; i++)
                    {
                        using (var page = doc.GetPage(i))
                        {
                            page.StartParse((int)PDFPage.ParseFlags.e_ParsePageNormal, null, false);

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

                    doc.SaveAs(output_file, (int)PDFDoc.SaveFlags.e_SaveFlagNoOriginal);
                    Console.WriteLine("Add watermarks to PDF file.");

                    for (int i = 0; i < nCount; i++)
                    {
                        using (var page = doc.GetPage(i))
                        {
                            page.StartParse((int)PDFPage.ParseFlags.e_ParsePageNormal, null, false);

                            if (page.HasWatermark())
                            {
                                page.RemoveAllWatermarks();
                            }
                        }
                    }

                    doc.SaveAs(output_remove_file, (int)PDFDoc.SaveFlags.e_SaveFlagNoOriginal);
                    Console.WriteLine("Remove watermarks to PDF file.");
                }
            }
            catch (System.Exception e)
            {
                Console.WriteLine(e.Message);
            }

            Library.Release();
        }
    }
}
