#!/usr/bin/env python3
#
# 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.

from __future__ import print_function

import os.path

try:
    from urllib.parse import urlparse
except ImportError:
    from urlparse import urlparse


def main():
    home = os.path.expanduser("~")
    backup_configs(home)
    indices = []
    if (os.environ.get('DIB_PYPI_MIRROR_URL') or
            os.environ.get('PYPI_MIRROR_URL')):
        candidates = [k for k in os.environ if
                      k.startswith('DIB_PYPI_MIRROR_URL')]
        back_compat = [k for k in os.environ if
                       k.startswith('PYPI_MIRROR_URL')]
        if len(back_compat) > 0:
            print('DEPRECATION WARNING: Please use DIB_PYPI_MIRROR_URL* rather'
                  ' than PYPI_MIRROR_URL*')
        candidates += back_compat
        indices = list(map(os.environ.get, sorted(candidates)))
    else:
        indices = ['file:///tmp/pypi']
        print('WARNING: You are using the pypi element but no pypi mirror is '
              'defined via the PYPI_MIRROR_URL env variable')
    use_pypi_python_org = True
    if os.environ.get('DIB_OFFLINE'):
        use_pypi_python_org = False
    if os.environ.get('DIB_NO_PYPI_PIP'):
        use_pypi_python_org = False
    if use_pypi_python_org:
        indices.append('https://pypi.python.org/simple')
    retries = os.environ.get('DIB_PIP_RETRIES')
    with open(home + '/.pip/pip.conf', 'wt') as output:
        output.write('[global]\n')
        output.write('log = %s/pip.log\n' % (home,))
        output.write('index-url = %s\n' % (indices[0],))
        output.write('trusted-host =  %s\n' % (urlparse(indices[0]).hostname,))
        if retries is not None:
            output.write('retries = %s\n' % retries)
        if len(indices) > 1:
            output.write('extra-index-url =\n')
            for index in indices[1:]:
                output.write('    %s\n' % (index,))


def backup_configs(home):
    pip_dir = home + '/.pip'
    if not os.path.exists(pip_dir):
        os.mkdir(pip_dir)
    if os.path.exists(pip_dir + '/pip.conf'):
        os.rename(pip_dir + '/pip.conf', pip_dir + '/pip.conf.orig')
    if os.path.exists(home + '/.pydistutils.cfg'):
        os.rename(home + '/.pydistutils.cfg', home + '/.pydistutils.cfg.orig')


if __name__ == '__main__':
    main()