#
# Gramps - a GTK+/GNOME based genealogy program
#
# Copyright (C) 2009 Benny Malengier
#
# 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., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
#

# $Id: docbackend.py 12437 2009-04-13 02:11:49Z pez4brian $

"""Html and Html format management for the different reports 
"""

#------------------------------------------------------------------------
#
# Python modules
#
#------------------------------------------------------------------------
from xml.sax.saxutils import escape

#-------------------------------------------------------------------------
#
# GTK modules
#
#-------------------------------------------------------------------------

#------------------------------------------------------------------------
#
# Gramps modules
#
#------------------------------------------------------------------------
from gen.plug.docbackend import DocBackend
from libhtml import Html

try:
    from gen.plug import PluginManager, Plugin
    from gettext import gettext as _
except ImportError:
    print 'Plugin manager not imported.'


#------------------------------------------------------------------------
#
# Document Backend class for html pages
#
#------------------------------------------------------------------------

class HtmlBackend(DocBackend):
    """
    Implementation for html pages
    Contrary to other backends, we do not write to file but to a Html object
    instead, writing out the file on close.
    """
    
    STYLETAG_TO_PROPERTY = {
        DocBackend.FONTCOLOR : 'font-color:%s;',
        DocBackend.HIGHLIGHT : 'background-color:%s;',
        DocBackend.FONTFACE  : "font-family:'%s';",
        DocBackend.FONTSIZE  : 'font-size:%spx;',
    }

    # overwrite base class attributes, they become static var of CairoDoc
    SUPPORTED_MARKUP = [
            DocBackend.BOLD,
            DocBackend.ITALIC,
            DocBackend.UNDERLINE,
            DocBackend.FONTFACE,
            DocBackend.FONTSIZE,
            DocBackend.FONTCOLOR,
            DocBackend.HIGHLIGHT,
            DocBackend.SUPERSCRIPT ]

    STYLETAG_MARKUP = {
        DocBackend.BOLD        : ("<strong>", "</strong>"),
        DocBackend.ITALIC      : ("<em>", "</em>"),
        DocBackend.UNDERLINE   : ('<span style="text-decoration:underline;">', 
                                    "</span>"),
        DocBackend.SUPERSCRIPT : ("<sup>", "</sup>"),
    }
    
    ESCAPE_FUNC = lambda x: escape

    def __init__(self, filename=None):
        """
        @param filename: path name of the file the backend works on
        """
        DocBackend.__init__(self, filename)
        self.html_page = None
        self.html_header = None
        self.html_body = None
        
    def _create_xmltag(self, type, value):
        """
        overwrites the method in DocBackend
        creates the pango xml tags needed for non bool style types
        """
        if type not in self.SUPPORTED_MARKUP:
            return None
        if type == DocBackend.FONTSIZE:
            #size is in points
            value = str(value)
        
        return ('<span style="%s">' % (self.STYLETAG_TO_PROPERTY[type] %
                                       (value)), 
                '</span>')

    def open(self):
        """
        overwrite method, htmlbackend creates a html object that is written on
        close
        """
        self.html_page, self.html_header, self.html_body = Html.page()

    def __write(self, str):
        """ a write to the file
        """
        DocBackend.write(self, str)

    def write(obj):
        """ write to the html page. One can pass a html object, or a string
        """
        self.html_body += obj
        
    def close(self):
        """
        write out the html to the page
        """
        DocBackend.open(self)
        self._html.write(self.__write)
        DocBackend.close(self)

# ------------------------------------------
#
#            Register Plugin
#
# -------------------------------------------

try:
    PluginManager.get_instance().register_plugin( 
    Plugin(
        name = __name__,
        description = _("Manages a HTML file implementing DocBackend."),
        module_name = __name__ 
        )
    )
except NameError:
    print 'Plugin not registered.'