from django import forms

from django.core.urlresolvers import reverse

from django.http import HttpResponse, HttpResponseRedirect, Http404

from django.shortcuts import render_to_response

from django.template import RequestContext

from django.utils.translation import ugettext as _, ugettext_lazy

from cm.converters.pandoc_converters import pandoc_convert

from cm.models import Text, TextVersion, Attachment, Comment

import mimetypes

import simplejson

EXPORT2_INFOS = {

# key -> { mimetype, extension}

's5' :   {},

'pdf' :  {'mimetype': 'application/pdf', 'extension':'pdf'},

'markdown' :  {'mimetype': 'text/plain', 'extension':'mkd'},

'odt' :  {'mimetype': 'application/vnd.oasis.opendocument.text', 'extension':'odt'},

'latex' :{'mimetype': 'text/x-tex', 'extension':'tex'},

'html' :{'mimetype': 'text/html', 'extension':'html'},

# raw export

'raw' : {'mimetype': 'text/plain', 'extension':'txt'}

}

def content_export2(request, content, title, content_format, format, use_pandoc, download_response):

    # TODO : formats must be imported from converters

#    import pdb;pdb.set_trace()

    if format == 'raw' :

        export_content = content

    elif content_format == 'html' and format == 'html':

        export_content = HTML_HEADER % content

    elif content_format == 'markdown' and format == 'markdown':

        export_content = content

    else:

        if use_pandoc :

            export_content = pandoc_convert(content, content_format, format, full=True)

        else :

            fix_content = content

            if content_format == 'html':

                from cm.converters.oo_converters import combine_css_body                

                fix_content = combine_css_body(content, '')

            from cm.converters.oo_converters import convert_html as oo_convert                

            export_content = oo_convert(fix_content, format)

    export_infos = EXPORT2_INFOS[format]

    if download_response:

        return _response_download(export_content, title, export_infos['mimetype'], export_infos['extension']) ;

    else:

        return _response_write(export_content)    

def content_export_new(request, content, title, src_format, format, use_pandoc, download_response):

    # TODO : formats must be imported from converters

    if format == 'raw' :

        export_content = content

    elif src_format == format and format == 'html':

        export_content = HTML_HEADER % content

    else:

        if use_pandoc :

            export_content = pandoc_convert(content, src_format, format, full=True)

        else :

            fix_content = content

            if src_format == 'html':

                from cm.converters.oo_converters import combine_css_body                

                fix_content = combine_css_body(content, '')

            from cm.converters.oo_converters import convert_html as oo_convert                

            export_content = oo_convert(fix_content, format)

    export_infos = EXPORT_INFOS[format]

    format_download = export_infos[0] 

    if download_response:

        return _response_download(export_content, export_infos[1], export_infos[2]) ;

    else:

        return _response_write(export_content)    

# read conversion chain 

# execute chain 

# ready to send response

#    # TODO : formats must be imported from converters

#    if format == 'raw' :

#        export_content = content

#    elif src_format == format and format == 'html':

#        export_content = HTML_HEADER % content

#    else:

#        if use_pandoc :

#            export_content = pandoc_convert(content, src_format, format, full=True)

#        else :

#            fix_content = content

#            if src_format == 'html':

#                fix_content = combine_css_body(content, '')

#            export_content = oo_convert(fix_content, format)

#    

## send response

#    export_infos = EXPORT_INFOS[format]

#    mimetype = export_infos['mimetype']

#    extension = export_infos['extension']

#    

#    if download:

#        return _response_download(export_content, mimetype, extension)

#    else :

#        return _response_write(export_content)

#

def _response_download(content, title, mimetype, extension):

    response = HttpResponse(mimetype=mimetype)

    file_title = title + '.' + extension

    from email.header import Header

    encoded_name = str(Header(file_title.encode('utf8'), charset='utf8', maxlinelen=500))

    # TODO: find a way to include long (more than 76 chars) into header

    encoded_name = encoded_name.replace('\n','')

    response['Content-Disposition'] = 'attachment; filename=%s' % encoded_name

    response.write(content)

    return response        

def _response_write(content):

    response = HttpResponse()

    response.write(content)

    return response

EXPORT_INFOS = {

# key -> [ download?, mimetype, extension]

's5' :   [False , ],

'pdf' :  [True , 'application/pdf' , 'pdf'],

'markdown' :  [True , 'text/plain' , 'mkd'],

'odt' :  [True , 'application/vnd.oasis.opendocument.text', 'odt'],

'latex' :[True , 'text/x-tex', 'tex'],

'html' :[True , 'text/html', 'html'],

# raw export

'raw' : [True, 'text/plain', 'txt']

}

HTML_HEADER = u"""

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">

<html><head>

<STYLE TYPE='text/css'>

div.pagebreakhere {

    page-break-before: always ;

}

</STYLE>

<meta http-equiv="Content-Type" content="text/html; charset=UTF-8"/></head>

<body>%s</body>

</html>

"""

EXPORT_FORMATS = EXPORT_INFOS.keys()

def content_export(request, content, title, src_format, format, use_pandoc):

    # TODO : formats must be imported from converters

    if format == 'raw' :

        export_content = content

    elif src_format == format and format == 'html':

        export_content = HTML_HEADER % content

    else:

        if use_pandoc :

            export_content = pandoc_convert(content, src_format, format, full=True)

        else :

            fix_content = content

            if src_format == 'html':

                from cm.converters.oo_converters import combine_css_body                

                fix_content = combine_css_body(content, '')

            from cm.converters.oo_converters import convert_html as oo_convert                

            export_content = oo_convert(fix_content, format)

    export_infos = EXPORT_INFOS[format]

    format_download = export_infos[0] 

    if format_download:

        format_mimetype = export_infos[1]

        format_extension = export_infos[2]

        response = HttpResponse(mimetype=format_mimetype)

        file_title = title + '.' + format_extension

        from email.header import Header

        encoded_name = str(Header(file_title.encode('utf8'), charset='utf8', maxlinelen=500))

        response['Content-Disposition'] = u'attachment; filename=%s' % encoded_name

        response.write(export_content)

        return response        

    else:

        response = HttpResponse()

        response.write(export_content)

        return response    

def text_export(request, key, format):

    # TODO : formats must be imported from converters

    format = format.lower()

    if format not in EXPORT_FORMATS:

        raise Exception("Unsupported format %s (supported formats %s)" % (format, ' '.join(EXPORT_FORMATS)))

    text = Text.objects.get(key=key)

    text_version = text.get_latest_version()

    return content_export(request, text_version.content, text_version.title, text_version.format, format)

def text_feed(request, key):

    return ""