#!/usr/bin/python
#
# Copyright (c) 2012 The Chromium OS Authors. All rights reserved.
# Use of this source code is governed by a BSD-style license that can be
# found in the LICENSE file.

"""Tool for preprocessing tests to determine their DEPENDENCIES.

Given an autotest root directory, this tool will aggregate the DEPENDENCIES of
all tests into a single file ready for later consumption by the dynamic suite
infrastructure.  ALL DATA MUST BE STORED IN LITERAL TYPES!  Dicts, lists,
strings, etc.

Data will be written to stdout (or, optionally a file).  Format will be:

{'suite1': {'path/to/test1/control': set(['dep1', 'dep2']),
            'path/to/test2/control': set(['dep2', 'dep3'])},
 'suite2': {'path/to/test4/control': set(['dep6']),
            'path/to/test5/control': set(['dep7', 'dep3'])}}

This is intended for use only with Chrome OS test suits that leverage the
dynamic suite infrastructure in server/cros/dynamic_suite.py.
"""

import optparse, os, sys
import common
from autotest_lib.client.common_lib import control_data
from autotest_lib.server.cros.dynamic_suite import control_file_getter
from autotest_lib.server.cros.dynamic_suite.suite import Suite

def parse_options():
    parser = optparse.OptionParser()
    parser.add_option('-a', '--autotest_dir', dest='autotest_dir',
                      default=os.path.abspath(
                          os.path.join(os.path.dirname(__file__), '..')),
                      help="Directory under which to search for tests."\
                           " (e.g. /usr/local/autotest).  Defaults to '..'")
    parser.add_option('-o', '--output_file', dest='output_file',
                      default=None,
                      help='File into which to write collected test info.'\
                           '  Defaults to stdout.')
    options, _ = parser.parse_args()
    return options


def main():
    options = parse_options()

    fs_getter = Suite.create_fs_getter(options.autotest_dir)
    predicate = lambda t: hasattr(t, 'suite')
    test_deps = {}  #  Format will be {suite: {test: [dep, dep]}}.
    for test in Suite.find_and_parse_tests(fs_getter, predicate, True):
        for suite in Suite.parse_tag(test.suite):
            suite_deps = test_deps.setdefault(suite, {})
            # Force this to a list so that we can parse it later with
            # ast.literal_eval() -- which is MUCH safer than eval()
            if test.dependencies:
                suite_deps[test.path] = list(test.dependencies)
            else:
                suite_deps[test.path] = []

    if options.output_file:
        with open(options.output_file, 'w+') as fd:
            fd.write('%r' % test_deps)
    else:
        print '%r' % test_deps

if __name__ == "__main__":
    sys.exit(main())