import templates, pygments, cgi, db, datetime, hashlib, settings, os, mimetypes
from pygments import highlight
from pygments.lexers import get_all_lexers, get_lexer_by_name
from pygments.formatters import HtmlFormatter

class Paste(object):
	def __init__(self):
		lexers = dict([(x[0], x[1][0]) for x in get_all_lexers()])
		self.lexers = []
		removed = []
		for cat, ls in settings.categories:
			for l in ls:
				removed.append(l)
			self.lexers.append((cat, [(x, lexers[x]) for x in ls]))
		for l in removed:
			try:
				del lexers[l]
			except KeyError:
				pass
		self.lexers.append(('Others' if settings.categories else 'Syntax', sorted(lexers.items(), cmp = lambda a, b: cmp(a[0], b[0]))))
		self.formatter = HtmlFormatter(linenos = 'table', lineanchors = 'line', anchorlinenos = True)

	def paste(self):
		if self.environ['REQUEST_METHOD'] == 'POST':
			mp = cgi.FieldStorage(fp = self.environ['wsgi.input'], environ = self.environ, keep_blank_values = True)
			if mp['type'].value == 'Preview':
				return self.preview(mp)
			elif mp['type'].value == 'Paste':
				return self.add_paste(mp)
			else:
				self.start_response('400 Bad Request', [('Content-Type', 'text/plain')])
				return ['Invalid type "%s".' % mp['type'].value]
		self.start_response('200 OK', [('Content-Type', 'text/html')])
		return [str(templates.paste(searchList = {
			'title': settings.pastebin_name,
			'header': settings.pastebin_name,
			'lexers': self.lexers,
			}))]

	def preview(self, mp):
		lex = get_lexer_by_name(mp['syntax'].value)
		text = highlight(mp['text'].value, lex, self.formatter)
		self.start_response('200 OK', [('Content-Type', 'text/html')])
		return [str(templates.view(searchList = {
			'title': settings.pastebin_name,
			'header': '%s – Preview' % settings.pastebin_name,
			'hash': None,
			'date': datetime.datetime.utcnow().ctime(),
			'nick': mp['nick'].value or 'Anoynmous',
			'syntax': lex.name,
			'pastetitle': mp['title'].value or 'Untitled',
			'text': text,
			}))]

	def add_paste(self, mp):
		nick = mp['nick'].value
		syntax = mp['syntax'].value
		title = mp['title'].value
		text = mp['text'].value

		hash = hashlib.md5(datetime.datetime.utcnow().ctime() + self.environ['REMOTE_ADDR']).hexdigest()

		try:
			session = db.Session()
			paste = db.Paste(hash, nick, datetime.datetime.utcnow(), syntax, title, text)
			session.add(paste)
			session.commit()
		finally:
			session.close()

		self.start_response('302 Found', [('Location', '/view/%s' % hash)])
		return []

	def view(self):
		hash = self.path[1]

		try:
			session = db.Session()
			paste = session.query(db.Paste).filter_by(hash = hash).one()
		finally:
			session.close()

		lex = get_lexer_by_name(paste.syntax)
		text = highlight(paste.text, lex, self.formatter)
		self.start_response('200 OK', [('Content-Type', 'text/html')])
		return [str(templates.view(searchList = {
			'title': '%s – View paste – %s' % (settings.pastebin_name, paste.title),
			'header': '%s – View paste' % settings.pastebin_name,
			'hash': hash,
			'date': paste.date.ctime(),
			'nick': paste.nick or 'Anonymous',
			'syntax': lex.name,
			'pastetitle': paste.title or 'Untitled',
			'text': text,
			}))]

	def raw(self):
		hash = self.path[1]

		try:
			session = db.Session()
			paste = session.query(db.Paste).filter_by(hash = hash).one()
		finally:
			session.close()

		self.start_response('200 OK', [('Content-Type', 'text/plain')])
		return [str(paste.text)]

	def highlight_stylesheet(self):
		self.start_response('200 OK', [('Content-Type', 'text/css')])
		return [self.formatter.get_style_defs()]

	def static(self):
		filename = settings.static_root + os.path.sep + self.path[1]
		if not self.path[1] in ('paste.css', 'edit.js') or not os.path.exists(filename):
			self.start_response('404 Not Found', [('Content-Type', 'text/html'), ('Location', '/')])
			return ['<a href="/">asdf</a>']
		self.start_response('200 OK', [('Content-Type', mimetypes.guess_type(filename)[0] or 'text/plain')])
		return open(filename)

	def __call__(self, environ, start_response):
		self.environ = environ
		self.start_response = start_response

		path = self.environ['PATH_INFO'].split('/')[1:]
		module = path[0] or 'paste'
		if module in ('list', 'paste', 'view', 'raw', 'static', 'highlight_stylesheet'):
			self.path = path
			return getattr(self, module)()
		else:
			start_response('404 Not Found', [('Content-Type', 'text/html'), ('Location', '/')])
			return ['<a href="/">/</a>']

if __name__ == '__main__':
	from wsgiref.simple_server import make_server
	httpd = make_server('', 8000, Paste())
	httpd.serve_forever()