from StringIO import StringIO
from trac.util import escape
from trac.WikiFormatter import wiki_to_oneliner

def unescape(text):
	"""Un-escapes &, <, > and \""""
	if not text:
		return ''
	return str(text).replace('&amp;', '&') \
		.replace('&lt;', '<') \
		.replace('&gt;', '>') \
		.replace('&#34;', '"')

footnote_set = 1
footnotes = []

def execute(hdf, args, env):
	global footnotes, footnote_set
	# Display and clear footnotes...
	if not args:
		out = StringIO()
		out.write('<div class="footnotes">\n');
		out.write('<hr style="width: 10%; padding: 0; margin: 2em 0 1em 0;"/>\n');
		out.write('<ol style="padding: 0 0 0 1em; margin: 0;">\n')
		for i, v in enumerate(footnotes):
			id = "%i.%i" % (footnote_set, i + 1)
			out.write('<li style="list-style: none;" id="FootNote%s"><a style="font-weight: bold;" href="#FootNoteRef%s">%i.</a> %s</li>\n' % (id, id, i + 1, wiki_to_oneliner(unescape(v), hdf, env, env.get_db_cnx())))
		out.write('</ol>\n')
		out.write('</div>\n');
		footnotes = []
		footnote_set += 1
		return out.getvalue()
	else:
		id = len(footnotes) + 1
		try:
			id = int(args)
		except ValueError:
			existing = None
			for index, note in enumerate(footnotes):
				if args == note:
					existing = note
					id = index + 1
					break
			if not existing:
				footnotes.append(args)
		full_id = "%i.%i" % (footnote_set, id)
		return '<sup><a title="%s" style="font-size: 8pt; font-weight: bold;" id="FootNoteRef%s" href="#FootNote%s">%i</a></sup>' % (args[:16] + "...", full_id, full_id, id)