// 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 do full text search in PDF documents under a folder.


using System;
using System.Text;
using System.IO;

using foxit;
using foxit.common;
using foxit.common.fxcrt;
using foxit.pdf;
using foxit.pdf.graphics;
using foxit.pdf.objects;
using foxit.fts;
namespace fulltextsearchCS
{
    class TextDoc
    {
        private FileStream mfile_stream;
        public TextDoc(string file_name, FileMode fill_mode)
        {
            mfile_stream = new FileStream(file_name, fill_mode);
        }
        ~TextDoc()
        {
            try
            {
                mfile_stream.Flush();
                mfile_stream.Close();
            }
            catch (System.ObjectDisposedException e)
            {
                string str = e.Message;
            }

        }
        public void Write(string contents)
        {
            if (null == contents) return;
            byte[] byte_data = Encoding.Default.GetBytes(contents);
            // Move file pointer to the end of file.
            mfile_stream.Seek(0, SeekOrigin.End);
            mfile_stream.Write(byte_data, 0, byte_data.Length);
            mfile_stream.Flush();
        }
        public string Read()
        {
            int fs_len = (int)mfile_stream.Length;
            byte[] byte_data = new byte[fs_len];
            int r = mfile_stream.Read(byte_data, 0, byte_data.Length);
            string contents = System.Text.Encoding.UTF8.GetString(byte_data);
            return contents;
        }
    };

    class fulltextsearch
    {
        public class SearchCallbackImp : SearchCallback
        {
            private TextDoc text_doc_ = null;

            public SearchCallbackImp(string output_txt_file_path)
            {
                this.text_doc_ = new TextDoc(output_txt_file_path, FileMode.Create);
            }
            public override void Release()
            {
            }
            public override int RetrieveSearchResult(string file_path, int page_index, string match_result, int match_start_text_index, int match_end_text_index, string sentence, int sentence_start_text_index, int sentence_end_text_index)
            {
                string result_str = string.Format("RetrieveSearchResult:\nFound file is: {0}\nPage index is: {1}\nStart text index: {2}\nEnd text index: {3}\nMatch is: {4}\nSentence Start text index: {5}\nSentence End text index: {6}\nSentence is: {7}\n",
                    file_path, page_index, match_start_text_index, match_end_text_index, match_result, sentence_start_text_index, sentence_end_text_index, sentence);
                text_doc_.Write(result_str);
                text_doc_.Write("\r\n");

                return 0;
             }
        }
        public class Search_Pause : PauseCallback
        {
            public Search_Pause(int pause_count_limit = 0, bool always_pause = false)
            {
               pause_count_ = 0;
		       pause_count_limit_ = pause_count_limit;
               always_pause_ = always_pause;
            }

            public override bool NeedToPauseNow()
            {
                if (always_pause_) return true;
                if (pause_count_ < pause_count_limit_)
                {
                    pause_count_++;
                    return true;
                }
                else
                {
                    pause_count_ = 0;
                    return false; // This is to test a case: valid PauseCallback but needParseNow() will always return FALSE.
                }
            }
            public void ClearCount()
            {
                pause_count_ = 0;
            }
            private int pause_count_limit_ = 0;
            private int pause_count_= 0;
            private bool always_pause_=false;
        }
        static void Main(string[] args)
        {
            string input_path = "../input_files/fulltextsearch/";
            string output_path = "../output_files/fulltextsearch/";
            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);
            try
            {
         
                using (FullTextSearch full_text_search = new FullTextSearch())
                {
                    //The path of data base to store the indexed data...
                    String dbPath = output_path + "search.db";
                    full_text_search.SetDataBasePath(dbPath);
                    // Get document source information.
                    using (DocumentsSource docs_source = new DocumentsSource(input_path))
                    {
                        // Create a Pause callback object implemented by users to pause the updating process.
                        using (Search_Pause pause = new Search_Pause(5))
                        {   
                            Progressive serch_progress = full_text_search.StartUpdateIndex(docs_source, pause, false);
                            Progressive.State state = Progressive.State.e_ToBeContinued;
                            while (state == Progressive.State.e_ToBeContinued)
	                        {
                                state = serch_progress.Continue();
	                        }
                            // Create a callback object which will be invoked when a matched one is found.
	                        using (SearchCallbackImp searchCallback = new SearchCallbackImp(output_path + "result.txt"))
                            {
	                            // Search the specified keyword from the indexed data source.
	                            full_text_search.SearchOf("Foxit",FullTextSearch.RankMode.e_RankHitCountASC, searchCallback);
                            }
                        }
                    }
                    Console.WriteLine("FullTextSearch demo.");
                }
            }
            catch (System.Exception e)
            {
                Console.WriteLine(e.Message);
            }
            Library.Release();
        }
    }
}
