/****************************************************************************
 *
 * File:            textext.cpp
 *
 * Usage:           textext PDF-input
 *
 * Description:     Extracts Text of a PDF document and prints it to a 
 *                  unicode file
 *
 * Version:         1.03  (12-July-2005)
 *
 * Author:          Philip Renggli, PDF Tools AG   
 * 
 * Copyright:       Copyright (C) 2005 PDF Tools AG, Switzerland
 *                  Permission to use, copy, modify, and distribute this
 *                  software and its documentation for any purpose and without
 *                  fee is hereby granted, provided that the above copyright
 *                  notice appear in all copies and that both that copyright
 *                  notice and this permission notice appear in supporting
 *                  documentation.  This software is provided "as is" without
 *                  express or implied warranty.
 *
 ***************************************************************************/

#include <stdio.h>
#include <windows.h>
#include <fcntl.h>
#include <stdlib.h>
#include <io.h>
#include "expa_c.h"

void print(const WCHAR* wzStr, FILE* out)
{
    while(*wzStr) 
    {
      if (*wzStr == '\n') 
      {
        fputc('\r', out);
        fputc(0, out);
      }
      fputc(*wzStr % 256, out);
      fputc(*wzStr / 256, out);
      wzStr++;
    }
}

int main(int argc, char* argv[])
{
    TExpaDocument         pDocument;
    TExpaContent          pContent;
    TExpaText             pText;
    int                   iPage;
    const unsigned short* sText;
    FILE*                 out;

    if (argc < 3)
    {
        printf("Usage: textext input.pdf output.txt");
        return 3;
    } 

    ExpaInitialize();

    /* Create the object */
    pDocument = ExpaCreateObject();

    /* Open the document */
    if (!ExpaDocOpen(pDocument, argv[1], "")) 
    {
        printf("error opening PDF file %s...\n",argv[1]);
        return 1;
    }

    /* Create a Unicode Output file */
    out = fopen(argv[2], "wb");
    if (!out){
        fprintf(stderr, "Couldn't create file %s\n", argv[2]);
        return 2;
    }
//#ifdef WIN32
    _setmode(_fileno(stdout), _O_BINARY);
//#endif
    fprintf(out, "\377\376");

    /* loop through all page and render them */
    for(iPage = 1; iPage <= ExpaDocGetPageCount(pDocument); iPage++)
    {
        float y;

        /* set the page number */
        ExpaDocSetPageNo(pDocument, iPage);

        /* get the content */
        pContent = ExpaPageGetContent(ExpaDocGetPage(pDocument));
        
        /* extract words */
        ExpaContentResetContent(pContent, 1);
        ExpaContentSetBreakWords(pContent, true);      
        
        y = -1;
        while (pText = ExpaContentGetNextText(pContent)) 
        {
            int nLength;

            nLength = ExpaTextGetStringLength(pText);
			if (nLength)
			{
                TPDFVector* pos;

				/* print the text, add newline if the Y coordinate changes. */
                pos = ExpaTextGetPosition(pText);
                if (pos[0].y != y)
                    print(L"\n", out);

				/* write the text token */
				sText = ExpaTextGetUnicodeString(pText);
                if (sText)
				    print(sText, out);

				/* add a line break or a space */
				print(L" ", out);

				/* save the Y position */
				y = pos[0].y;
			}
		}
    }
    /* Close the text file */
    fclose(out);

    /* Close and Destroy the object */
    ExpaDocClose(pDocument);
    ExpaDestroyObject(pDocument);
    ExpaUnInitialize();
    return 0;
}