#!/usr/bin/env python

import os, sys
pythonPath = os.environ['SCM_PYTHON_PATH']

if len(pythonPath) > 0:
  pathParts = pythonPath.split(os.pathsep)
  for i in range(len(pathParts)):
    sys.path.insert(i, pathParts[i])

repositoryPath = os.environ['SCM_REPOSITORY_PATH']
repositoryName = os.environ['REPO_NAME']
readonlyString = os.environ['SCM_REPOSITORY_READONLY']
readonly = True

if readonlyString == 'False':
  readonly = False

def run_with_cgi(application):

    environ = dict(os.environ.items())
    environ['wsgi.input']        = sys.stdin
    environ['wsgi.errors']       = sys.stderr
    environ['wsgi.version']      = (1, 0)
    environ['wsgi.multithread']  = False
    environ['wsgi.multiprocess'] = True
    environ['wsgi.run_once']     = True

    if environ.get('HTTPS', 'off') in ('on', '1'):
        environ['wsgi.url_scheme'] = 'https'
    else:
        environ['wsgi.url_scheme'] = 'http'

    headers_set = []
    headers_sent = []

    def write(data):
        if not headers_set:
             raise AssertionError("write() before start_response()")

        elif not headers_sent:
             # Before the first output, send the stored headers
             status, response_headers = headers_sent[:] = headers_set
             sys.stdout.write('Status: %s\r\n' % status)
             for header in response_headers:
                 sys.stdout.write('%s: %s\r\n' % header)
             sys.stdout.write('\r\n')

        sys.stdout.write(data)
        sys.stdout.flush()

    def start_response(status, response_headers, exc_info=None):
        if exc_info:
            try:
                if headers_sent:
                    # Re-raise original exception if headers sent
                    raise exc_info[0], exc_info[1], exc_info[2]
            finally:
                exc_info = None     # avoid dangling circular ref
        elif headers_set:
            raise AssertionError("Headers already set!")

        headers_set[:] = [status, response_headers]
        return write

    result = application(environ, start_response)
    try:
        for data in result:
            if data:    # don't send headers until body appears
                write(data)
        if not headers_sent:
            write('')   # send headers now if body was empty
    finally:
        if hasattr(result, 'close'):
            result.close()

from bzrlib.transport.http import wsgi

def application(environ, start_response):
  app = wsgi.make_app(
      root=repositoryPath,
      prefix="/"+repositoryName,
      path_var='PATH_INFO',
      readonly=readonly,
      enable_logging=True)
  return app(environ, start_response)

run_with_cgi(application)