#!/usr/bin/python
# Copyright 2010-2020 Gentoo Authors
# Distributed under the terms of the GNU General Public License v2
#
# Note: We don't want to import portage modules directly because we do things
# like run the testsuite through multiple versions of python.

"""Helper script to run portage unittests against different python versions.

Note: Any additional arguments will be passed down directly to the underlying
unittest runner.  This lets you select specific tests to execute.
"""

import argparse
import os
import shutil
import subprocess
import sys
import tempfile


# These are the versions we fully support and require to pass tests.
PYTHON_SUPPORTED_VERSIONS = [
	'3.6',
	'3.7',
	'3.8',
	'3.9'
]
# The rest are just "nice to have".
PYTHON_NICE_VERSIONS = [
	'pypy3',
	'3.10'
]

EPREFIX = os.environ.get('PORTAGE_OVERRIDE_EPREFIX', '/')


class Colors:
	"""Simple object holding color constants."""

	_COLORS_YES = ('y', 'yes', 'true')
	_COLORS_NO = ('n', 'no', 'false')

	WARN = GOOD = BAD = NORMAL = ''

	def __init__(self, colorize=None):
		if colorize is None:
			nocolors = os.environ.get('NOCOLOR', 'false')
			# Ugh, look away, for here we invert the world!
			if nocolors in self._COLORS_YES:
				colorize = False
			elif nocolors in self._COLORS_NO:
				colorize = True
			else:
				raise ValueError('$NOCOLORS is invalid: %s' % nocolors)
		else:
			if colorize in self._COLORS_YES:
				colorize = True
			elif colorize in self._COLORS_NO:
				colorize = False
			else:
				raise ValueError('--colors is invalid: %s' % colorize)

		if colorize:
			self.WARN = '\033[1;33m'
			self.GOOD = '\033[1;32m'
			self.BAD = '\033[1;31m'
			self.NORMAL = '\033[0m'


def get_python_executable(ver):
	"""Find the right python executable for |ver|"""
	if ver in ('pypy', 'pypy3'):
		prog = ver
	else:
		prog = 'python' + ver
	return os.path.join(EPREFIX, 'usr', 'bin', prog)


def get_parser():
	"""Return a argument parser for this module"""
	epilog = """Examples:
List all the available unittests.
$ %(prog)s --list

Run against specific versions of python.
$ %(prog)s --python-versions '2.7 3.3'

Run just one unittest.
$ %(prog)s lib/portage/tests/xpak/test_decodeint.py
"""
	parser = argparse.ArgumentParser(
		description=__doc__,
		formatter_class=argparse.RawDescriptionHelpFormatter,
		epilog=epilog)
	parser.add_argument('--keep-temp', default=False, action='store_true',
		help='Do not delete the temporary directory when exiting')
	parser.add_argument('--color', type=str, default=None,
		help='Whether to use colorized output (default is auto)')
	parser.add_argument('--python-versions', action='append',
		help='Versions of python to test (default is test available)')
	return parser


def main(argv):
	parser = get_parser()
	opts, args = parser.parse_known_args(argv)
	colors = Colors(colorize=opts.color)

	# Figure out all the versions we want to test.
	if opts.python_versions is None:
		ignore_missing = True
		pyversions = PYTHON_SUPPORTED_VERSIONS + PYTHON_NICE_VERSIONS
	else:
		ignore_missing = False
		pyversions = []
		for ver in opts.python_versions:
			if ver == 'supported':
				pyversions.extend(PYTHON_SUPPORTED_VERSIONS)
			else:
				pyversions.extend(ver.split())

	tempdir = None
	try:
		# Set up a single tempdir for all the tests to use.
		# This way we know the tests won't leak things on us.
		tempdir = tempfile.mkdtemp(prefix='portage.runtests.')
		os.environ['TMPDIR'] = tempdir

		# Actually test those versions now.
		statuses = []
		for ver in pyversions:
			prog = get_python_executable(ver)
			cmd = [prog, '-b', '-Wd', 'lib/portage/tests/runTests.py'] + args
			if os.access(prog, os.X_OK):
				print('%sTesting with Python %s...%s' %
					(colors.GOOD, ver, colors.NORMAL))
				statuses.append((ver, subprocess.call(cmd)))
			elif not ignore_missing:
				print('%sCould not find requested Python %s%s' %
					(colors.BAD, ver, colors.NORMAL))
				statuses.append((ver, 1))
			else:
				print('%sSkip Python %s...%s' %
					(colors.WARN, ver, colors.NORMAL))
			print()
	finally:
		if tempdir is not None:
			if opts.keep_temp:
				print('Temporary directory left behind:\n%s' % tempdir)
			else:
				# Nuke our tempdir and anything that might be under it.
				shutil.rmtree(tempdir, True)

	# Then summarize it all.
	print('\nSummary:\n')
	width = 10
	header = '| %-*s | %s' % (width, 'Version', 'Status')
	print('%s\n|%s' % (header, '-' * (len(header) - 1)))
	exit_status = 0
	for ver, status in statuses:
		exit_status += status
		if status:
			color = colors.BAD
			msg = 'FAIL'
		else:
			color = colors.GOOD
			msg = 'PASS'
		print('| %s%-*s%s | %s%s%s' %
			(color, width, ver, colors.NORMAL, color, msg, colors.NORMAL))
	exit(exit_status)


if __name__ == '__main__':
	try:
		main(sys.argv[1:])
	except KeyboardInterrupt:
		print('interrupted ...', file=sys.stderr)
		exit(1)