// 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.


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/";
const output_directory = output_path + "pdfreflow/";


function SaveBitmap(bitmap, index, file_name) {
 let margin = new FSDK.RectF(50,30,30,30);
 let size = new FSDK.PointF(480,800);
 let rect = new FSDK.RectI(0, 0, size.x, margin.top);
 bitmap.FillRect(0xFFFFFFFF, rect);
 rect = new FSDK.RectI(0, size.y - margin.bottom, size.x, size.y);
 bitmap.FillRect(0xFFFFFFFF, rect);
 let image = new FSDK.Image();
 image.AddFrame(bitmap);
  
 let save_path;
 let sIndex = `${index}`;    
 save_path = output_directory + "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.
function ReflowSingle(doc) {
  let margin = new FSDK.RectF(50,30,30,30);
  let size = new FSDK.PointF(480,800);
  let page_count = doc.GetPageCount();
  for (let i=0; i< page_count; i++) {
    let page = doc.GetPage(i);
    // Parse PDF page.
    page.StartParse(FSDK.PDFPage.e_ParsePageNormal, null, false);
  
    let reflow_page = new FSDK.ReflowPage(page);
    // Set some arguments used for parsing the relfow page.
    reflow_page.SetLineSpace(0);
    reflow_page.SetScreenMargin(margin.left, margin.top, margin.right, margin.bottom);
    reflow_page.SetScreenSize(size.x, size.y);
    reflow_page.SetZoom(100);
    reflow_page.SetParseFlags(FSDK.ReflowPage.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.
    let content_width = reflow_page.GetContentWidth();
    let content_height = reflow_page.GetContentHeight();
  
    // Create a bitmap for rendering the reflow page. The bitmap size contains the margin.
    let bitmap = new FSDK.Bitmap(content_width + margin.left + margin.right,
            content_height + margin.top + margin.bottom, FSDK.Bitmap.e_DIBArgb, null, 0);
    bitmap.FillRect(0xFFFFFFFF, null);
  
    // Render reflow page.
    let renderer = new FSDK.Renderer(bitmap, false);
    let matrix = reflow_page.GetDisplayMatrix(0, 0,content_width,content_height, FSDK.e_Rotation0);
    renderer.StartRenderReflowPage(reflow_page, matrix, null);
    let file_name = "_single_";
    SaveBitmap(bitmap, i,file_name);
  }  
}

// Fixed bitmap size, just to simulate split screen situation.
function ReflowContinuous(doc) {
    let margin = new FSDK.RectF(50,30,30,30);
    let size = new FSDK.PointF(480,800);
    let display_height = size.y - margin.top - margin.bottom;
    let bitmap = new FSDK.Bitmap(size.x, size.y, FSDK.Bitmap.e_DIBArgb, null, 0);
    let offset_y = 0;
    let page_count = doc.GetPageCount();
  
    let bitmap_index = 0;
  
    for(let i=0; i<page_count; i++)
    {
      let page = doc.GetPage(i);
  
      // Parse PDF page.
      page.StartParse(FSDK.PDFPage.e_ParsePageNormal, null, false);
  
      let reflow_page = new FSDK.ReflowPage(page);
      // Set some arguments used for parsing the relfow page.
      reflow_page.SetLineSpace(0);
      reflow_page.SetScreenMargin(margin.left, margin.top, margin.right, margin.bottom);
      reflow_page.SetScreenSize(size.x, size.y);
      reflow_page.SetZoom(100);
      reflow_page.SetParseFlags(FSDK.ReflowPage.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.
      let content_height = reflow_page.GetContentHeight();
      let content_width = reflow_page.GetContentWidth();
      // Render reflow page.
      let renderer =  new FSDK.Renderer(bitmap, false);
      let matrix = reflow_page.GetDisplayMatrix(0, 0, content_width, content_height, FSDK.e_Rotation0);
      renderer.StartRenderReflowPage(reflow_page, matrix, null);
  
      let rate_need_screen_count = Math.ceil(Math.max(content_height - display_height, 0) / display_height);
      if (rate_need_screen_count > 0) {
        // Before do next rendering, save current bitmap first.
        let file_name = "_continuous_";
        SaveBitmap(bitmap, bitmap_index++,file_name);
  
        let has_display_height = display_height;
        for (let 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.
          let renderer = new FSDK.Renderer(bitmap, false);
          let matrix = reflow_page.GetDisplayMatrix(0, -has_display_height,content_width,content_height,FSDK.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;
      }
    }
    let file_name = "_continuous_";
    SaveBitmap(bitmap,  bitmap_index++,file_name);  
  }


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;
}

if (!fs.existsSync(output_directory)) {
    fs.mkdirSync(output_directory);
}  

let input_file = input_path + "AboutFoxit.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;
    }
    ReflowContinuous(doc);
    ReflowSingle(doc);

    console.log("Reflow test.");
} catch (e) {
    console.log(e)
    err_ret = 1;
}
FSDK.Library.Release();