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#!/usr/bin/env python
#
#  Copyright 2011 Raul Gutierrez Segales
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 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 General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA


from gettext import gettext as _
import os
from plugins.plugin import Plugin

from TurtleArt.tapalette import make_palette
from TurtleArt.talogo import primitive_dictionary
from TurtleArt.taconstants import NO_IMPORT


class Ocr(Plugin):

    def __init__(self, parent):
        self._tawindow = parent

        if self._check_ocr_cmd():
            self._enabled = True
        else:
            self._enabled = False

    def _check_ocr_cmd(self):
        ret = os.system("gocr > /dev/null 2>&1")
        if ret == 0:
            return True
        return False

    def setup(self):
        if not self._enabled:
            return

        palette = make_palette('sensor',
                               colors=["#FF6060", "#A06060"],
                               help_string=_('Palette for Image Processing'))
        primitive_dictionary['do_ocr'] = self.prim_do_ocr
        palette.add_block('do_ocr',
                          style='box-style',
                          label=_('OCR'),
                          help_string=_('Run OCR on the current canvas'),
                          value_block=True,
                          prim_name='do_ocr')
        self._tawindow.lc.def_prim('do_ocr', 0,
                                   lambda self: primitive_dictionary['do_ocr']())
        NO_IMPORT.append('ocr')

    def start(self):
        ''' Prepare stuff '''
        pass

    def quit(self):
        ''' This gets called when the activity quits '''
        # TODO: clean up pending ocr processes
        pass

    def stop(self):
        ''' This gets called by the stop button '''
        # TODO: clean up pending ocr processes
        pass

    def clear(self):
        ''' This gets called by the clean button and erase button '''
        # TODO: clean up pending ocr processes
        pass

    def prim_do_ocr(self):
        """ Perform OCR on what is available on the canvas """
        if not self._enabled:
            return

        temp_name = "ocrTMP"
        self._tawindow.save_as_image(temp_name)

        ocr_cmd = "gocr %s" % (temp_name + ".png")
        fd = os.popen(ocr_cmd)
        output = "".join(fd.readlines())

        # TODO: Save this to the Journal or.. 
        print output