// 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.

import com.foxit.sdk.PDFException;
import com.foxit.sdk.common.Library;
import com.foxit.sdk.common.Bitmap;
import com.foxit.sdk.common.Image;
import com.foxit.sdk.common.Renderer;
import com.foxit.sdk.common.fxcrt.Matrix2D;
import com.foxit.sdk.common.fxcrt.PointF;
import com.foxit.sdk.common.fxcrt.RectF;
import com.foxit.sdk.common.fxcrt.RectI;
import com.foxit.sdk.pdf.PDFDoc;
import com.foxit.sdk.pdf.PDFPage;
import com.foxit.sdk.pdf.ReflowPage;

import java.io.File;

import static com.foxit.sdk.common.Bitmap.e_DIBArgb;
import static com.foxit.sdk.common.Constants.e_ErrSuccess;
import static com.foxit.sdk.common.Constants.e_Rotation0;
import static com.foxit.sdk.pdf.PDFPage.e_ParsePageNormal;
import static com.foxit.sdk.pdf.ReflowPage.e_Normal;
import static com.foxit.sdk.pdf.ReflowPage.e_WithImage;
import static java.lang.Math.max;
import static java.lang.StrictMath.ceil;

public class pdfreflow {
    private static String key = "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";
    private static String sn = "Rew1vB0TqoMIxX444UcpScARWdhgJpsJfzmyMLR32a0+EgrCjp2NaQ==";
    private static String output_path = "../output_files/pdfreflow/";
    private static String input_path = "../input_files/";

    // You can also use System.load("filename") instead. The filename argument must be an absolute path name.
    static {
       String os = System.getProperty("os.name").toLowerCase();
       String lib = "fsdk_java_";
       if (os.startsWith("win")) {
           lib += "win";
       } else if (os.startsWith("mac")) {
          lib += "mac";
       } else {
           lib += "linux";
       }
        
       if (System.getProperty("sun.arch.data.model").equals("64")) {
        if(System.getProperty("os.arch").equals("aarch64")){
          if(os.startsWith("mac")){
             lib += "arm";
           }
           else{
             lib += "armv8";
           }
         }
         else{
            lib += "64";
         }
        } else {
         if(System.getProperty("os.arch").equals("arm")){
            lib += "armv7";
         }
         else{
            lib += "32";
         }
       }
       System.loadLibrary(lib);
    }

    private static void createResultFolder(String output_path) {
        File myPath = new File(output_path);
        if (!myPath.exists()) {
            myPath.mkdir();
        }
    }

    public static void SaveBitmap(Bitmap bitmap, int index, String file_name) throws PDFException {
        RectF margin = new RectF(50, 30, 30, 30);
        PointF size = new PointF(480, 800);
        RectI rect = new RectI(0, 0, (int) size.getX(), (int) margin.getTop());
        bitmap.fillRect(0xFFFFFFFF, rect);
        rect = new RectI(0, (int) size.getY() - (int) margin.getBottom(), (int) size.getX(), (int) size.getY());
        bitmap.fillRect(0xFFFFFFFF, rect);
        Image image = new Image();
        image.addFrame(bitmap);

        String save_path;
        String sIndex;
        sIndex = "" + index;
        save_path = output_path + "reflow" + file_name + sIndex + ".bmp";
        image.saveAs(save_path);
    }

    // The change for the size of the picture depends on the size of the content of reflow page.
    public static void ReflowSingle(PDFDoc doc) throws PDFException {
        RectF margin = new RectF(50, 30, 30, 30);
        PointF size = new PointF(480, 800);
        int nCount = doc.getPageCount();
        for (int i = 0; i < nCount; i++) {
            PDFPage page = doc.getPage(i);
            // Parse PDF page.
            page.startParse(e_ParsePageNormal, null, false);

            ReflowPage reflow_page = new ReflowPage(page);
            // Set some arguments used for parsing the relfow page.
            reflow_page.setLineSpace(0);
            reflow_page.setScreenMargin((int) margin.getLeft(), (int) margin.getTop(), (int) margin.getRight(), (int) margin.getBottom());
            reflow_page.setScreenSize(size.getX(), size.getY());
            reflow_page.setZoom(100);
            reflow_page.setParseFlags(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 margin.
            Bitmap bitmap = new Bitmap((int) (content_width + margin.getLeft() + margin.getRight()),
                    (int) (content_height + margin.getTop() + margin.getBottom()), e_DIBArgb, null, 0);
            bitmap.fillRect(0xFFFFFFFF, null);

            // Render reflow page.
            Renderer renderer = new Renderer(bitmap, false);
            Matrix2D matrix = reflow_page.getDisplayMatrix(0, 0,(int)content_width,(int)content_height,e_Rotation0);
            renderer.startRenderReflowPage(reflow_page, matrix, null);
            String file_name = "_single_";
            SaveBitmap(bitmap, i, file_name);
        }

    }

    // Fixed bitmap size, just to simulate split screen situation.
    public static void ReflowContinuous(PDFDoc doc) throws PDFException {
        RectF margin = new RectF(50, 30, 30, 30);
        PointF size = new PointF(480, 800);
        float display_height = size.getY() - margin.getTop() - margin.getBottom();
        Bitmap bitmap = new Bitmap((int) (size.getX()), (int) (size.getY()), e_DIBArgb, null, 0);
        float offset_y = 0;
        int nCount = doc.getPageCount();

        int bitmap_index = 0;

        for (int i = 0; i < nCount; i++) {
            PDFPage page = doc.getPage(i);

            // Parse PDF page.
            page.startParse(e_ParsePageNormal, null, false);

            ReflowPage reflow_page = new ReflowPage(page);
            // Set some arguments used for parsing the relfow page.
            reflow_page.setLineSpace(0);
            reflow_page.setScreenMargin((int) (margin.getLeft()), (int) (margin.getTop()),
                    (int) (margin.getRight()), (int) (margin.getBottom()));
            reflow_page.setScreenSize(size.getX(), size.getY());
            reflow_page.setZoom(100);
            reflow_page.setParseFlags(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.
            Renderer renderer = new Renderer(bitmap, false);
            Matrix2D matrix = reflow_page.getDisplayMatrix(0, 0,(int)content_width,(int)content_height,e_Rotation0);
            renderer.startRenderReflowPage(reflow_page, matrix, null);

            int rate_need_screen_count = (int) (ceil(max(content_height - display_height, 0.0f) / display_height));
            if (rate_need_screen_count > 0) {
                // Before do next rendering, save current bitmap first.
                String file_name = "_continuous_";
                SaveBitmap(bitmap, bitmap_index++, file_name);

                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.
                    renderer = new Renderer(bitmap, false);
                    matrix = reflow_page.getDisplayMatrix(0, -has_display_height,(int)content_width,(int)content_height,e_Rotation0);
                    renderer.startRenderReflowPage(reflow_page, matrix, null);
                    if (j != rate_need_screen_count - 1) {
                        has_display_height += display_height;
                        SaveBitmap(bitmap, bitmap_index++, file_name);
                    } else {
                        offset_y = content_height - rate_need_screen_count * display_height;
                    }
                }
            } else {
                offset_y = content_height;
            }
        }
        String file_name = "_continuous_";
        SaveBitmap(bitmap, bitmap_index++, file_name);

    }

    public static void main(String[] args) throws PDFException {
        createResultFolder(output_path);
        // Initialize library
        int error_code = Library.initialize(sn, key);
        if (error_code != e_ErrSuccess) {
            System.out.println("Library Initialize Error: " + error_code);
            return;
        }

        String input_file = input_path + "AboutFoxit.pdf";
        try {
            PDFDoc doc = new PDFDoc(input_file);
            error_code = doc.load(null);
            if (error_code != e_ErrSuccess) {
                System.out.println("The Doc " + input_file + " Error: " + error_code);
                return;
            }
            ReflowContinuous(doc);
            ReflowSingle(doc);
            System.out.println("Reflow test.");

        } catch (Exception e) {
            e.printStackTrace();
        }
        Library.release();
    }
}
