import os

import tempfile

import re

import pexpect

from abi_error import AbiConverterError, AbiCommandError

TYPES_IN  = {'602': '602',       'abw': 'abw',       'aw': 'aw',     

             'awt': 'awt',       'cwk': 'cwk',       'dbk': 'dbk',   

             'doc': 'doc',       'docm': 'docm',     'docx': 'docx', 

             'dot': 'dot',       'dotm': 'dotm',     'dotx': 'dotx',

             'fo': 'fo',         'htm': 'htm',       'html': 'html', 

             'hwp': 'hwp',       'isc': 'isc',       'iscii': 'iscii',   

             'kwd': 'kwd',       'mif': 'mif',       'odt': 'odt',

             'opml': 'opml',     'ott': 'ott',       'pdb': 'pdb',

             'pdf': 'pdf',       'rtf': 'rtf',       'sdw': 'sdw',

             'stw': 'stw',       'sxw': 'sxw',       'text': 'text',

             'txt': 'txt',       'wml': 'wml',       'wp': 'wp',

             'wpd': 'wpd',       'wri': 'wri',       'xhtml': 'xhtml',

             'xml': 'xml',       'zabw': 'zabw'}

TYPES_OUT = {'abw': 'abw',       'aw': 'aw',         'awt': 'awt',

             'dbk': 'dbk',       'doc': 'doc',       'eml': 'eml',

             'fo': 'fo',         'html': 'html',     'isc': 'isc',

             'iscii': 'iscii',   'kwd': 'kwd',       'latex': 'latex',

             'mht': 'mht',       'mif': 'mif',       'nroff': 'nroff',

             'nws': 'nws',       'odt': 'odt',       'pdb': 'pdb',

             'pdf': 'pdf',       'ps': 'ps',         'rtf': 'rtf',

             'sxw': 'sxw',       'text': 'text',     'txt': 'txt',

             'wml': 'wml',       'xml': 'xml',       'xml2ps': 'xml2ps',

             'zabw': 'zabw'}

class AbiFileConverter(object):

    """This let's you convert between all filetypes supperted by the 

    AbiWord program. Import type isn't checked, as AbiWord doesn't check 

    on extension, but on metadata.

    """

    def __init__(self, timeout=60):

        self.id = None

        self.timeout = timeout

        self._start_abiword()

    def _start_abiword(self):

        """

        Start abiword with the AbiCommand plugin, if not already started

        """

        # find the abiword executable

        abicommand = None

        for dir in os.environ['PATH'].split(':'):

            if os.path.isfile(os.path.join(dir, 'abiword')):

                abicommand = os.path.join(dir, 'abiword')

        if not abicommand:

            raise AbiConverterError('Can not find abiword executable')

        # start the abiword executable

        try:

            self.child = pexpect.spawn(abicommand + ' --plugin AbiCommand')

            self.child.expect(

                    'AbiWord command line plugin: Type "quit" to exit', 10)

        except:

            raise AbiConverterError('Can not open abiword executable')

    def stop_abiword(self):

        """

        Stop the running abiword, kill it if necessary

        """

        self.child.sendline('quit')

        if self._is_running():

            os.kill(self.child.pid, 9)

    def _is_running(self):

        """

        Test to see if abiword is running

        """

        try:

            self.child.sendline('writepid /dev/null')

            self.child.expect('OK', 1)

            return True

        except:

            return False

    def convert_file(self, in_file, out_file=None, type=None):

        """

        Convert a file. If out_file is not specified, a byte string is 

        returned. If type is not specified, the file extension from out_file is

        used to determine the type. If this fails, the type 'text' is used.

        Return value is -1 if an error occurred.

        """

        # is the out_file specified?

        return_bytes = False

        if out_file is None:

            out_file = tempfile.mktemp(prefix="abiconvert_")

            return_bytes = True

        # is the type specified

        type = TYPES_OUT.get(

            type or os.path.splitext(out_file)[1][1:], 'txt')

        # do the coversion

        self._perform_conversion(in_file, out_file, type)

        # return a byte string if no out_file is specified

        if return_bytes:

            fp = open(out_file,  'r')

            bytes = fp.read()

            fp.close()

            os.remove(out_file)

            return bytes

    def _perform_conversion(self, in_file, out_file, type):

        """

        Do the actual conversion

        """

        # make sure we are up and running 

        if not self._is_running:

            self._start_abiword()

        # convert the file

        cmd = 'convert %s %s %s' % (os.path.abspath(in_file), 

                                    os.path.abspath(out_file), type)

        self.child.sendline(cmd)

        # Check for errors

        i = self.child.expect(['OK', pexpect.TIMEOUT])

        if i != 0:

            raise AbiCommandError('Error performing AbiCommand: %s' %cmd)

    def convert_to_html(self, input):

        """ 

        Convert input file to HTML

        """

        from tempfile import mkstemp,mkdtemp

        THE_OUTDIR = "outdir"

        THE_OUTFILE = "outfile"

        THE_INDIR = "indir"

        THE_INFILE = "infile"

        infile = None

        outfile = None

        out_f = None

        try:

          # create in/out files

          temp_dir = mkdtemp(prefix="cm_")

          # in

          indir_name = os.path.join(temp_dir, THE_INDIR)

          os.mkdir(indir_name)

          infile_name = os.path.join(indir_name, THE_INFILE)

          # out

          outdir_name = os.path.join(temp_dir, THE_OUTDIR)

          os.mkdir(outdir_name)

          outfile_name = os.path.join(outdir_name, THE_OUTFILE)

          # write infile 

          infile = open(infile_name,'w')

          if type(input) == unicode:

            input = input.encode('utf8')

          infile.write(input)

          infile.close()

          # fix perms

          # TODO group permission should suffice

          os.chmod(temp_dir, 0755) # read        

          os.chmod(indir_name, 0755) # read        

          os.chmod(infile_name, 0755) # read

          os.chmod(outdir_name, 0777) # read / write

          # Do the job

          self.convert_file(infile_name, outfile_name, 'html')

          out_f = open(outfile_name,'r')

          output = out_f.read()

          # load other files (useful only for html)

          img_res = [] 

          if os.path.isdir(outdir_name + '/' + THE_OUTFILE + '_files'):

            image_names = [name for name in os.listdir(outdir_name + '/' + THE_OUTFILE + '_files') if name != THE_OUTFILE]

            for image_name in image_names:

              img_res.append(os.path.join(outdir_name + '/' + THE_OUTFILE + '_files', image_name))

            # clean images paths

            output = re.sub(r'<img(.+src=")outfile_files/([^"]+")', r'<img\1\2', output);

            output = re.sub(r'<img(.+)style="width:[\d\.]+mm"', r'<img\1', output);

          return output,img_res

        finally:

          try:

            if out_f:

                out_f.close()

            if infile:

                infile.close()

          except:

            pass

    def convert_from_html(self, input, format):

        """ 

        Convert input file from HTML

        """

        from tempfile import mkstemp,mkdtemp

        THE_OUTDIR = "outdir"

        THE_OUTFILE = "outfile"

        THE_INDIR = "indir"

        THE_INFILE = "infile"

        infile = None

        outfile = None

        out_f = None

        try:

          # create in/out files

          temp_dir = mkdtemp(prefix="cm_")

          # in

          indir_name = os.path.join(temp_dir, THE_INDIR)

          os.mkdir(indir_name)

          infile_name = os.path.join(indir_name, THE_INFILE + '.html')

          # out

          outdir_name = os.path.join(temp_dir, THE_OUTDIR)

          os.mkdir(outdir_name)

          outfile_name = os.path.join(outdir_name, THE_OUTFILE)

          # write infile 

          infile = open(infile_name,'w')

          if type(input) == unicode:

            input = input.encode('utf8')

          infile.write(input)

          infile.close()

          # fix perms

          # TODO group permission should suffice

          os.chmod(temp_dir, 0755) # read        

          os.chmod(indir_name, 0755) # read        

          os.chmod(infile_name, 0755) # read

          os.chmod(outdir_name, 0777) # read / write

          # Do the job

          self.convert_file(infile_name, outfile_name, format)

          out_f = open(outfile_name,'r')

          output = out_f.read()

          return output

        finally:

          try:

            if out_f:

                out_f.close()

            if infile:

                infile.close()

            top = temp_dir

          except:

            pass

    def add_html_header(self, body):

        """ 

        Add an HTML header to an HTML body

        """

        return """

<html xmlns="http://www.w3.org/1999/xhtml">

    <head>

        <meta http-equiv="content-type" content="text/html; charset=utf-8" />

    </head>

    <body>

        %s

    </body>

</html>

""" %body