from pandoc_converters import pandoc_convert

import chardet 

import re

# TODO: move that in text_base: save images

def convert_from_mimetype(file_name, mime_type, format):

    input = open(file_name, 'r').read()

    return _convert_from_mimetype(input, mime_type, format)

def to_unicode(input):

    if type(input) == str:

        res = None

        for encoding in [chardet.detect(input)['encoding'], 'utf8', 'latin1']:

            try:

                res = unicode(input, encoding)

                break;

            except UnicodeDecodeError:

                pass

        if not res:

            raise Exception('UnicodeDecodeError: could not decode')

        return res

    return input

def _convert_from_mimetype(input, mime_type, format):

    #input = to_unicode(input)

    attachs = []

    attachs_dir = None

    ##############################

    if mime_type in ['application/vnd.oasis.opendocument.text',

                     'application/msword',

                     ]:

        xhtml_input, attachs = convert_oo_to_html(input)

        converted_input = pandoc_convert(xhtml_input, 'html', format)

    ##############################

    # anything looks like code: put them into markdown citation

        converted_input = markdown_from_code(input)

    ##############################

    # html

    elif mime_type in ['text/html', 'application/xhtml+xml']:

        if format == 'html':

            converted_input = input

        else:

            converted_input = pandoc_convert(input, 'html', format)

    ##############################

    # anything looks like text -> markdown

    elif mime_type in ['text/plain',

                       'text/english',

                       'text/enriched'

                      ]:

        converted_input = to_unicode(input)

    ##############################

    # default case: assume it's text

    else:

        converted_input = to_unicode(input)

    return converted_input, attachs

def fix_img_path(html, xhtml, imgs):

    """

    imgs : name --> path

    """

    finder_re = 'src[\s]*=[\s]*\"((?:(?!https?))[^\"]*)\"'

    len_res_html = len(re.findall(finder_re, html, re.IGNORECASE))

    len_res_xhtml = len(re.findall(finder_re, xhtml, re.IGNORECASE))

    res_html = re.finditer(finder_re, html, re.IGNORECASE)

    res_xhtml = re.finditer(finder_re, xhtml, re.IGNORECASE)

    result = []

    last_index = 0

    for match_xhtml in res_xhtml:

        img_path = '' 

        try:

            match_html = res_html.next()

            if match_html:

                img_name = match_html.group(1)

                img_path = imgs[img_name]

        except StopIteration:

            # TODO : report pb

            pass 

        offset = len(match_xhtml.group(0)) - len(match_xhtml.group(1))

        result.append(xhtml[last_index:match_xhtml.start() + offset - 1])

        result.append(img_path)

        last_index = match_xhtml.end() - 1 # -1 because trailing "

    result.append(xhtml[last_index:len(xhtml)])

    return u''.join(result)

def convert_oo_to_html(input):

    from oo_converters import convert    

    html_input, images = convert(input, 'html')

    enc = chardet.detect(html_input)['encoding']

    try_encodings = [enc, 'utf8', 'latin1']

    res_content = None

    for encoding in try_encodings:

        try:

            res_content_html = unicode(html_input, encoding)

            break;

        except UnicodeDecodeError:

            pass

    if not res_content_html:

        raise Exception('UnicodeDecodeError: could not decode')

    return res_content_html, images

def old_convert_oo_to_html(input): 

    from oo_converters import convert   

    html_input, images = convert(input, 'html')

    xhtml_input, _not_used_ = convert(input, 'xhtml')

    enc = chardet.detect(xhtml_input)['encoding']

    try_encodings = [enc, 'utf8', 'latin1']

    res_content = None

    for encoding in try_encodings:

        try:

            # TODO: fix path and manage images

            #res_content = fix_img_path(unicode(html_res_content,encoding),

            #                           unicode(xhtml_res_content,encoding),

            #                           iimg)

            res_content_html = unicode(html_input, encoding)

            res_content_xhtml = unicode(xhtml_input, encoding)

            break;

        except UnicodeDecodeError:

            pass

    if not res_content_html or not res_content_xhtml:

        raise Exception('UnicodeDecodeError: could not decode')

    return res_content_html, res_content_xhtml, images

def markdown_from_code(code):

    CODE_INDICATOR = "    " # 4 spaces

    return '\n'.join([CODE_INDICATOR + line for line in code.split('\n')])