# -*- coding: utf-8 -*-
#
# Copyright (C) 2008 Wouter Bolsterlee <uws@xs4all.nl>
#
# This macro is put in the public domain by the author. Do whatever you want
# with it, but it would be nice if your improvements somehow come back to me.
#

from trac.wiki.api import WikiSystem
from trac.util.html import html, escape
from trac.wiki.macros import WikiMacroBase


class SiblingNavMacro(WikiMacroBase):
    '''
    Show a navigation TOC of the current page hiearchy with a list of sibling
    pages of the current page.
    '''

    def render_macro(self, req, name, content):

        current_page = req.args.get('page', 'WikiStart')
        prefix = content or current_page

        hierarchy = prefix.split('/')
        
        if len(hierarchy) <= 1:
            hierarchy.append('__DUMMY__')

        wiki = WikiSystem(self.env)

        elements = []

        # Build items for sibling pages (if any)
        sibling_items = []
        for page in sorted(wiki.get_pages(hierarchy[0]+'/')):
            page_name = wiki.format_page_name(page[page.rfind('/')+1:])
            link = html.A(page_name, href=req.href.wiki(page))
            if page == current_page:
                li = html.LI(link, class_='active')
            else:
                li = html.LI(link)
            sibling_items.append(li)

        if not sibling_items:
            return None

        # Build titles for parent pages
        for level in hierarchy[0:-1]:
            title = u'↑ %s' % wiki.format_page_name(level)
            elements.append(html.H4(html.A(title, href=req.href.wiki(level))))

        # Add the list of items
        elements.append(html.UL(sibling_items))

        # Wrapper div for styling
        div = html.DIV(elements, class_='wiki-toc') 

        # Output 
        return div