#!/usr/bin/env python

import os.path

def main():
    home = os.path.expanduser("~")
    backup_configs(home)
    indices = []
    if os.environ.get('PYPI_MIRROR_URL'):
        candidates = [k for k in os.environ if k.startswith('PYPI_MIRROR_URL')]
        indices = list(map(os.environ.get, sorted(candidates)))
    else:
        indices = ['file:///tmp/pypi']
    easy_index = indices[-1]
    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')
    with file(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],))
        for index in indices[1:]:
            output.write('extra-index-url = %s\n' % (index,))
    with file(home + '/.pydistutils.cfg', 'wt') as output:
        output.write('[easy_install]\n')
        output.write('index_url = %s\n' % (easy_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()