# Copyright (c) 2018 - 2020  Peter Pentchev <roam@ringlet.net>
# All rights reserved.
#
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions
# are met:
# 1. Redistributions of source code must retain the above copyright
#    notice, this list of conditions and the following disclaimer.
# 2. Redistributions in binary form must reproduce the above copyright
#    notice, this list of conditions and the following disclaimer in the
#    documentation and/or other materials provided with the distribution.
#
# THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
# ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
# ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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"""
Run the confget tests using the Python methods.

Load the test data, then run the tests using the objects provided by
the Python library, not by executing the command-line tool.
"""

import itertools
import os
import sys
import unittest

import ddt  # type: ignore
import pytest  # type: ignore

from confget import format as cformat

pytest.register_assert_rewrite("unit_tests.data.defs")

# pylint: disable=wrong-import-position
from .data import defs as tdefs  # noqa: E402
from .data import load as tload  # noqa: E402

# pylint: enable=wrong-import-position


try:
    from typing import Dict

    _TYPING_USED = [Dict, tdefs]
except ImportError:
    _TYPING_USED = [tdefs]


TESTS = tload.load_all_tests(os.environ["TESTDIR"])

FULL_TEST_DATA = [
    (fname, setenv, test)
    for fname, idx, setenv, test in sorted(
        itertools.chain(
            *[
                [
                    (tfile[0], idx, tfile[1].setenv, test)
                    for idx, test in enumerate(tfile[1].tests)
                ]
                for tfile in TESTS.items()
            ]
        )
    )
]

SKIP_ARGS = set(["check_only"])


@ddt.ddt
class TestStuff(unittest.TestCase):
    # pylint: disable=no-self-use
    """ Run the tests using the Python library. """

    @ddt.data(*FULL_TEST_DATA)
    @ddt.unpack
    def test_run(
        self,  # type: TestStuff
        fname,  # type: str
        setenv,  # type: Dict[str, str]
        test,  # type: tdefs.TestDef
    ):  # type: (...) -> None
        """ Instantiate a confget object, load the data, check it. """

        save_env = dict(os.environ)
        try:
            if set(test.args.keys()) & SKIP_ARGS:
                return

            backend = test.get_backend()
            config = test.get_config()
            if test.setenv:
                os.environ.update(setenv)

            if test.stdin:
                fname = os.environ["TESTDIR"] + "/" + test.stdin
                with open(fname, mode="r") as stdin:
                    save_stdin = sys.stdin
                    try:
                        sys.stdin = stdin
                        obj = backend(config)
                        data = obj.read_file()
                    finally:
                        sys.stdin = save_stdin
            else:
                obj = backend(config)
                data = obj.read_file()

            res = cformat.filter_vars(config, data)
            output = test.do_xform(line for line in res)
            test.output.check_result(output)
        finally:
            if test.setenv:
                os.environ.clear()
                os.environ.update(save_env)
