# Copyright (C) 2021 Mandiant, Inc. All Rights Reserved.
# Licensed under the Apache License, Version 2.0 (the "License");
#  you may not use this file except in compliance with the License.
# You may obtain a copy of the License at: [package root]/LICENSE.txt
# Unless required by applicable law or agreed to in writing, software distributed under the License
#  is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and limitations under the License.

import textwrap

import pytest

import capa.rules
import capa.engine
import capa.optimizer
import capa.features.common
from capa.engine import Or, And
from capa.features.insn import Mnemonic
from capa.features.common import Arch, Bytes, Substring


def test_optimizer_order():
    rule = textwrap.dedent(
        """
        rule:
            meta:
                name: test rule
                scope: function
            features:
                - and:
                    - substring: "foo"
                    - arch: amd64
                    - mnemonic: cmp
                    - and:
                      - bytes: 3
                      - offset: 2
                    - or:
                      - number: 1
                      - offset: 4
        """
    )
    r = capa.rules.Rule.from_yaml(rule)

    # before optimization
    children = list(r.statement.get_children())
    assert isinstance(children[0], Substring)
    assert isinstance(children[1], Arch)
    assert isinstance(children[2], Mnemonic)
    assert isinstance(children[3], And)
    assert isinstance(children[4], Or)

    # after optimization
    capa.optimizer.optimize_rules([r])
    children = list(r.statement.get_children())

    # cost: 0
    assert isinstance(children[0], Arch)
    # cost: 1
    assert isinstance(children[1], Mnemonic)
    # cost: 2
    assert isinstance(children[2], Substring)
    # cost: 3
    assert isinstance(children[3], Or)
    # cost: 4
    assert isinstance(children[4], And)