#!/usr/bin/env python

from os.path import join
from subprocess import check_call, check_output
from tempfile import TemporaryDirectory


def print_packages(packages, heading):
    print(f'{heading}:')
    print('  ', end='')
    print('\n  '.join(packages))


with TemporaryDirectory() as tmpdir:
    check_call(['python3', '-m', 'venv', tmpdir])

    # base needs
    check_call([join(tmpdir, 'bin', 'pip'), 'install', '.'])
    frozen = check_output([join(tmpdir, 'bin', 'pip'), 'freeze'])
    frozen = set(frozen.decode('utf-8').strip().split('\n'))

    # dev additions
    check_call([join(tmpdir, 'bin', 'pip'), 'install', '.[dev]'])
    dev_frozen = check_output([join(tmpdir, 'bin', 'pip'), 'freeze'])
    dev_frozen = set(dev_frozen.decode('utf-8').strip().split('\n')) - frozen

# pip installs the module itself along with deps so we need to get that out of
# our list by finding the thing that was file installed during dev
dev_frozen_sorted = sorted(dev_frozen)
dev_frozen = []
for package in dev_frozen_sorted:
    if 'file://' in package:
        ours = package.split(' @ ')[0]
    else:
        dev_frozen.append(package)
# now we can build the list of base requiements w/o ourself
frozen = sorted([p for p in frozen if not p.startswith(ours)])
# we also sorted things while we were at it above

print_packages(frozen, 'frozen')
print_packages(dev_frozen, 'dev_frozen')

with open('requirements.txt', 'w') as fh:
    fh.write('\n'.join(frozen))
    fh.write('\n')

with open('requirements-dev.txt', 'w') as fh:
    fh.write('\n'.join(dev_frozen))
    fh.write('\n')