// 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("@foxitsoftware/foxit-pdf-sdk-node");
const fs = require('fs');
const os = require('os');
const path = require('path');
const util = require('util');


var sn = "bPxThFlBAYifO3yiW0C51bKbjPap1zHaf5aG5sX378TjFvB7Q0802A==";
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();