// 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 reflow PDF pages.

using System;

using foxit;
using foxit.common;
using foxit.common.fxcrt;
using foxit.pdf;

namespace pdfreflowCS
{
    class pdfreflow
    {
        public static void SaveBitmap(foxit.common.Bitmap bitmap, string file_name)
        {
            RectF margin = new RectF(50,30,30,30);
            foxit.common.fxcrt.Point size = new foxit.common.fxcrt.Point(480,800);
            RectI rect = new RectI(0, 0, size.x, Convert.ToInt32(margin.top));
            bitmap.FillRect(0xFFFFFFFF, rect);
            rect = new RectI(0, (size.y - (int)margin.bottom), size.x, size.y);
            bitmap.FillRect(0xFFFFFFFF, rect);
            Image image = new Image();
            image.AddFrame(bitmap);
            image.SaveAs(file_name);
            image.Dispose();
        }

        // Fixed bitmap size, just to simulate split screen situation.
        public static void ReflowContinuous(PDFDoc doc,string output_path) 
        {
            RectF margin = new RectF(50f,30f,30f,30f);
            foxit.common.fxcrt.Point size = new foxit.common.fxcrt.Point(480,800);
            float display_height = size.y - margin.top - margin.bottom;
            
            foxit.common.Bitmap bitmap = new foxit.common.Bitmap(size.x, size.y, foxit.common.Bitmap.DIBFormat.e_DIBArgb, System.IntPtr.Zero, 0);
            bitmap.FillRect(0xFFFFFFFF, null);

            float offset_y = 0;
            int nCount = doc.GetPageCount();
            int bitmap_index = 0;
            for (int i = 0; i < nCount; i++)
            {
                using (PDFPage page = doc.GetPage(i))
                {
                    // Parse PDF page.
                    page.StartParse((int)foxit.pdf.PDFPage.ParseFlags.e_ParsePageNormal, null, false);

                    using (ReflowPage reflow_page = new ReflowPage(page))
                    {
                        // Set some arguments used for parsing the relfow page.
                        reflow_page.SetLineSpace(0);
                        reflow_page.SetScreenMargin((int)margin.left, (int)margin.top, (int)margin.right, (int)margin.bottom);
                        reflow_page.SetScreenSize(size.x, size.y);
                        reflow_page.SetZoom(100);
                        reflow_page.SetParseFlags((int)ReflowPage.Flags.e_WithImage);
                        reflow_page.SetTopSpace(offset_y);

                        // Parse reflow page.
                        reflow_page.StartParse(null);

                        // Get actual size of content of reflow page.
                        // The content size does not contain the margin but contains the top space.
                        float content_height = reflow_page.GetContentHeight();
                        float content_width = reflow_page.GetContentWidth();
                        // Render reflow page.
                        using (Renderer renderer = new Renderer(bitmap, false))
                        {
                            Matrix2D matrix = reflow_page.GetDisplayMatrix(0, 0, Convert.ToInt32(content_width), Convert.ToInt32(content_height), Rotation.e_Rotation0);
                            renderer.StartRenderReflowPage(reflow_page, matrix, null);
                            int rate_need_screen_count = (int)(Math.Ceiling(Math.Max(content_height - display_height, 0.0f) / display_height));
                            if (rate_need_screen_count > 0)
                            {
                                // Before do next rendering, save current bitmap first.
                                SaveBitmap(bitmap, string.Format("{0}reflow_continuous_{1}.bmp", output_path, bitmap_index++));

                                float has_display_height = display_height;
                                for (int j = 0; j < rate_need_screen_count; j++)
                                {
                                    // Clear the bitmap and used it to do next rendering.
                                    bitmap.FillRect(0xFFFFFFFF, null);
                                    // Render reflow page.
                                    using (Renderer _renderer = new Renderer(bitmap, false))
                                    {
                                        matrix = reflow_page.GetDisplayMatrix(0, -has_display_height, Convert.ToInt32(content_width), Convert.ToInt32(content_height), Rotation.e_Rotation0);
                                        renderer.StartRenderReflowPage(reflow_page, matrix, null);
                                        if (j != rate_need_screen_count - 1)
                                        {
                                            has_display_height += display_height;
                                            SaveBitmap(bitmap, string.Format("{0}reflow_continuous_{1}.bmp", output_path, bitmap_index++));
                                        }
                                        else
                                        {
                                            offset_y = content_height - rate_need_screen_count * display_height;
                                        }
                                    }
                                }
                            }
                            else
                            {
                                offset_y = content_height;
                            }
                        }
                    }
                }
                
            }
            SaveBitmap(bitmap, string.Format("{0}reflow_continuous_{1}.bmp", output_path, bitmap_index++));
        }

        // The change for the size of the picture depends on the size of the content of reflow page.
        public static void ReflowSingle(PDFDoc doc,string output_path) 
        {
            RectF margin = new RectF(50f,30f,30f,30f);
            foxit.common.fxcrt.Point size = new foxit.common.fxcrt.Point(480,800);
            int nCount = doc.GetPageCount();
            for (int i=0;i<nCount;i++) 
            {
                using (PDFPage page = doc.GetPage(i))
                {
                    // Parse PDF page.
                    page.StartParse((int)foxit.pdf.PDFPage.ParseFlags.e_ParsePageNormal, null, false);

                    using (ReflowPage reflow_page = new ReflowPage(page))
                    {
                        // Set some arguments used for parsing the relfow 
                        reflow_page.SetLineSpace(0);
                        reflow_page.SetScreenMargin((int)margin.left, (int)margin.top, (int)margin.right, (int)margin.bottom);
                        reflow_page.SetScreenSize(size.x, size.y);
                        reflow_page.SetZoom(100);
                        reflow_page.SetParseFlags((int)ReflowPage.Flags.e_Normal);

                        // Parse reflow page
                        reflow_page.StartParse(null);

                        // Get actual size of content of reflow page. The content size does not contain the margin.
                        float content_width = reflow_page.GetContentWidth();
                        float content_height = reflow_page.GetContentHeight();

                        // Create a bitmap for rendering the reflow page. The bitmap size contains the 
                        foxit.common.Bitmap bitmap = new foxit.common.Bitmap((int)(content_width + margin.left + margin.right), (int)(content_height + margin.top + margin.bottom), 
                                foxit.common.Bitmap.DIBFormat.e_DIBArgb, System.IntPtr.Zero, 0);
                        bitmap.FillRect(0xFFFFFFFF, null);                        

                        // Render reflow page
                        using (Renderer renderer = new Renderer(bitmap, false))
                        {
                            Matrix2D matrix = reflow_page.GetDisplayMatrix(0, 0, Convert.ToInt32(content_width), Convert.ToInt32(content_height), Rotation.e_Rotation0);
                            renderer.StartRenderReflowPage(reflow_page, matrix, null);

                            SaveBitmap(bitmap, string.Format("{0}reflow_single_{1}.bmp", output_path, i));
                            bitmap.Dispose();
                        }
                    }
                }
            } 
        }

        static void Main(string[] args)
        {
            string input_path = "../input_files/";
            string output_path = "../output_files/pdfreflow/";
            System.IO.Directory.CreateDirectory(output_path);

            string sn = "Rew1vB0TqoMIxX444UcpScARWdhgJpsJfzmyMLR32a0+EgrCjp2NaQ==";
            string key = "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";
            // Initialize library
            ErrorCode error_code = Library.Initialize(sn, key);
            if (error_code != ErrorCode.e_ErrSuccess)
            {
                Console.WriteLine("Library Initialize Error: {0}\n", error_code);
                return;
            }

            try
            {
                string input_file = input_path + "AboutFoxit.pdf";
                using (PDFDoc doc = new PDFDoc(input_file))
                {
                    error_code = doc.Load(null);
                    if (error_code != ErrorCode.e_ErrSuccess)
                    {
                        Console.WriteLine("The PDFDoc [{0}] Error: {1}\n", input_file, error_code);
                        Library.Release();
                        return;
                    }
                    ReflowContinuous(doc, output_path);
                    ReflowSingle(doc, output_path);

                    Console.WriteLine("Reflow test.");
                }
            }
            catch (foxit.PDFException e)
            {
                Console.WriteLine(e.Message);
            }

            Library.Release();
        }
    }
}
