// Copyright 2021 Code Intelligence GmbH
//
// 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
//
//      http://www.apache.org/licenses/LICENSE-2.0
//
// 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.

package com.code_intelligence.jazzer.utils

private val BASE_INCLUDED_CLASS_NAME_GLOBS = listOf(
    "**", // everything
)

// We use both a strong indicator for running as a Bazel test together with an indicator for a
// Bazel coverage run to rule out false positives.
private val IS_BAZEL_COVERAGE_RUN = System.getenv("TEST_UNDECLARED_OUTPUTS_DIR") != null &&
    System.getenv("COVERAGE_DIR") != null

private val ADDITIONAL_EXCLUDED_NAME_GLOBS_FOR_BAZEL_COVERAGE = listOf(
    "com.google.testing.coverage.**",
    "org.jacoco.**",
)

private val BASE_EXCLUDED_CLASS_NAME_GLOBS = listOf(
    // JDK internals
    "\\[**", // array types
    "java.**",
    "javax.**",
    "jdk.**",
    "sun.**",
    "com.sun.**", // package for Proxy objects
    // Azul JDK internals
    "com.azul.tooling.**",
    // Kotlin internals
    "kotlin.**",
    // Jazzer internals
    "com.code_intelligence.jazzer.**",
    "jaz.Ter", // safe companion of the honeypot class used by sanitizers
    "jaz.Zer", // honeypot class used by sanitizers
    // Test and instrumentation tools
    "org.junit.**", // dependency of @FuzzTest
    "org.mockito.**", // can cause instrumentation cycles
    "net.bytebuddy.**", // ignore Byte Buddy, though it's probably shaded
    "org.jetbrains.**", // ignore JetBrains products (coverage agent)
) + if (IS_BAZEL_COVERAGE_RUN) ADDITIONAL_EXCLUDED_NAME_GLOBS_FOR_BAZEL_COVERAGE else listOf()

class ClassNameGlobber(includes: List<String>, excludes: List<String>) {
    // If no include globs are provided, start with all classes.
    private val includeMatchers = includes.ifEmpty { BASE_INCLUDED_CLASS_NAME_GLOBS }
        .map(::SimpleGlobMatcher)

    // If no include globs are provided, additionally exclude stdlib classes as well as our own classes.
    private val excludeMatchers = (if (includes.isEmpty()) BASE_EXCLUDED_CLASS_NAME_GLOBS + excludes else excludes)
        .map(::SimpleGlobMatcher)

    fun includes(className: String): Boolean {
        return includeMatchers.any { it.matches(className) } && excludeMatchers.none { it.matches(className) }
    }
}