/*
** tesscapi.cpp    willus.com attempt at C wrapper for tesseract.
**                 (Butchered from tesseractmain.cpp)
**                 Last udpated 9-1-12
**
** Copyright (C) 2012  http://willus.com
**
** This program is free software: you can redistribute it and/or modify
** it under the terms of the GNU Affero General Public License as
** published by the Free Software Foundation, either version 3 of the
** License, or (at your option) any later version.
**
** This program is distributed in the hope that it will be useful,
** but WITHOUT ANY WARRANTY; without even the implied warranty of
** MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
** GNU Affero General Public License for more details.
**
** You should have received a copy of the GNU Affero General Public License
** along with this program.  If not, see <http://www.gnu.org/licenses/>.
**
*/

#include "config_auto.h"
#include "mfcpch.h"
// #define USE_VLD //Uncomment for Visual Leak Detector.
#if (defined _MSC_VER && defined USE_VLD)
#include <vld.h>
#endif

// Include automatically generated configuration file if running autoconf
#ifdef HAVE_CONFIG_H
#include "config_auto.h"
#endif
#ifdef USING_GETTEXT
#include <libintl.h>
#include <locale.h>
#define _(x) gettext(x)
#else
#define _(x) (x)
#endif

#include "allheaders.h"
#include "baseapi.h"
#include "strngs.h"
#include "params.h"
#include "blobs.h"
#include "notdll.h"

/* C Wrappers */
#include "tesseract.h"

static tesseract::TessBaseAPI api;

/*
** ocr_type=0:  OEM_DEFAULT
** ocr_type=1:  OEM_TESSERACT_ONLY
** ocr_type=2:  OEM_CUBE_ONLY
** ocr_type=3:  OEM_TESSERACT_CUBE_COMBINED
*/
int tess_capi_init(char *datapath,char *language,int ocr_type,FILE *out)

    {
    int status;

#ifdef USE_NLS
    setlocale (LC_ALL, "");
    bindtextdomain (PACKAGE, LOCALEDIR);
    textdomain (PACKAGE);
#endif
    // fprintf(stderr, "tesseract %s\n", tesseract::TessBaseAPI::Version());
    // Make the order of args a bit more forgiving than it used to be.
    const char* lang = "eng";
    tesseract::PageSegMode pagesegmode = tesseract::PSM_SINGLE_BLOCK;
    if (language!=NULL && language[0]!='\0')
        lang = language;
    /*
    if (output == NULL)
        {
        fprintf(stderr, _("Usage:%s imagename outputbase [-l lang] "
                      "[-psm pagesegmode] [configfile...]\n"), argv[0]);
        fprintf(stderr,
            _("pagesegmode values are:\n"
              "0 = Orientation and script detection (OSD) only.\n"
              "1 = Automatic page segmentation with OSD.\n"
              "2 = Automatic page segmentation, but no OSD, or OCR\n"
              "3 = Fully automatic page segmentation, but no OSD. (Default)\n"
              "4 = Assume a single column of text of variable sizes.\n"
              "5 = Assume a single uniform block of vertically aligned text.\n"
              "6 = Assume a single uniform block of text.\n"
              "7 = Treat the image as a single text line.\n"
              "8 = Treat the image as a single word.\n"
              "9 = Treat the image as a single word in a circle.\n"
              "10 = Treat the image as a single character.\n"));
        fprintf(stderr, _("-l lang and/or -psm pagesegmode must occur before any"
                      "configfile.\n"));
        exit(1);
        }
    */

    api.SetOutputName(NULL);
    status=api.Init(datapath,lang,
             ocr_type==0 ? tesseract::OEM_DEFAULT :
                (ocr_type==1 ? tesseract::OEM_TESSERACT_ONLY :
                   (ocr_type==2 ? tesseract::OEM_CUBE_ONLY :
                                  (tesseract::OEM_TESSERACT_CUBE_COMBINED))));
    if (status)
        return(status);
    /*
    api.Init("tesscapi",lang,tesseract::OEM_DEFAULT,
           &(argv[arg]), argc - arg, NULL, NULL, false);
    */
    // We have 2 possible sources of pagesegmode: a config file and
    // the command line. For backwards compatability reasons, the
    // default in tesseract is tesseract::PSM_SINGLE_BLOCK, but the
    // default for this program is tesseract::PSM_AUTO. We will let
    // the config file take priority, so the command-line default
    // can take priority over the tesseract default, so we use the
    // value from the command line only if the retrieved mode
    // is still tesseract::PSM_SINGLE_BLOCK, indicating no change
    // in any config file. Therefore the only way to force
    // tesseract::PSM_SINGLE_BLOCK is from the command line.
    // It would be simpler if we could set the value before Init,
    // but that doesn't work.
    if (api.GetPageSegMode() == tesseract::PSM_SINGLE_BLOCK)
        api.SetPageSegMode(pagesegmode);
    if (out!=NULL)
        fprintf(out,"Tesseract Open Source OCR Engine v%s with Leptonica\n",
                tesseract::TessBaseAPI::Version());
    /* Turn off CUBE debugging output */
    api.SetVariable("cube_debug_level","0");
    return(0);
    }


int tess_capi_get_ocr(PIX *pix,char *outstr,int maxlen,FILE *out)

    {
    STRING text_out;
    if (!api.ProcessPage(pix,0,NULL,NULL,0,&text_out))
        {
        /* pixDestroy(&pix); */
        if (out!=NULL)
            fprintf(out,"tesscapi:  Error during bitmap processing.\n");
        api.Clear();
        return(-1);
        }
    strncpy(outstr,text_out.string(),maxlen-1);
    outstr[maxlen-1]='\0';
    api.Clear();
    return(0);
    }


void tess_capi_end(void)

    {
    api.End();
    }
