#!/usr/bin/env python

# Copyright 2013 OpenStack Foundation
#
# Licensed under the Apache License, Version 2.0 (the "License"); you may
# not use this file except in compliance with the License. You may obtain
# a copy of the License at
#
#      http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
# License for the specific language governing permissions and limitations
# under the License.

import os
import subprocess

# For running locally
using_zuul = False
remote = "remotes/origin/"

def run_local(cmd, cwd='.', env={}):
    print "Running:", cmd
    newenv = os.environ
    newenv.update(env)
    p = subprocess.Popen(cmd, stdout=subprocess.PIPE, cwd=cwd,
                         stderr=subprocess.STDOUT, env=newenv)
    (out, nothing) = p.communicate()
    return (p.returncode, out.strip())

def git_branches():
    branches = []
    r, branch_list = run_local(['git', 'branch', '-a'])
    for branch in branch_list.split("\n"):
        branch = branch.strip()
        # If we use zuul, there's no need for filtering
        if not using_zuul and not branch.startswith('remotes/origin'):
            continue
        branches.append(branch)
    return branches

def git_tags():
    r, tag_list = run_local(['git', 'tag', '-n'])
    return [x for x in tag_list.split('\n') if x]


current = ''
previous = ''

# Running under Zuul v3, we do not have remotes/origin.
# Running locally, it exists. Let's check ZUUL_PROJECT for running under
# Zuul.

if os.getenv("ZUUL_PROJECT"):
    remote = ""
    using_zuul = True

for branch in git_branches():
    if branch.startswith( remote + 'master'):
        continue
    if branch.startswith( remote + 'template'):
        continue
    if branch.startswith( remote + 'HEAD'):
        continue
    if '->' in branch:
        continue
    r,o = run_local(['git', 'show', branch+':README.rst'])
    if not r:
        title = o.split('\n')[0]
        name = branch[len(remote):]
        print "Adding branch %s: %s" % (name, title)
        current += '<a href="%s/">%s</a><br/>\n' % (name, title)


for tagline in git_tags():
    tag, tag_title = [x.strip() for x in tagline.split(' ', 1)]
    r,o = run_local(['git', 'show', tag+':README.rst'])
    if not r:
        title = o.split('\n')[0]
        print "Adding tag %s: %s: %s" % (tag, tag_title, title)
        previous += '<a href="%s/">%s: %s</a><br/>\n' % (tag, tag_title, title)


if not os.path.exists('output'):
    os.mkdir('output')

out = open('output/index.html', 'w')
out.write(open('index.html').read().format(current=current, previous=previous))
out.close()