/*
 * Copyright 2019 The Android Open Source Project
 *
 * 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.
 */

#include "ProtoFuzzerUtils.h"

#include <android-base/file.h>
#include <android-base/macros.h>
#include <android-base/strings.h>
#include <hidl/ServiceManagement.h>

#define STRINGIFY(x) STRINGIFY_INTERNAL(x)
#define STRINGIFY_INTERNAL(x) #x

using android::FQName;
using android::base::GetExecutableDirectory;
using android::base::Join;
using android::base::Split;
using android::hardware::getAllHalInstanceNames;
using std::cerr;
using std::cout;
using std::string;

namespace android {
namespace vts {
namespace fuzzer {

// TODO(b/145220086): fuzzer should attempt to fuzz all interfaces and instances
// it can find.
static FQName FindAnyIfaceFQName(const FQName &package_and_version,
                                 const vector<CompSpec> &comp_specs) {
  for (const auto &spec : comp_specs) {
    auto package = package_and_version.package();
    auto major_version = package_and_version.getPackageMajorVersion();
    auto minor_version = package_and_version.getPackageMinorVersion();

    if (package == spec.package() &&
        major_version == spec.component_type_version_major() &&
        minor_version == spec.component_type_version_minor()) {
      auto iface_name = spec.component_name();
      auto descriptor = package_and_version.string() + "::" + iface_name;
      auto instance_names = getAllHalInstanceNames(descriptor);

      if (!instance_names.empty()) {
        auto version =
            std::to_string(major_version) + "." + std::to_string(minor_version);
        return FQName{package, version, iface_name};
      }
    }
  }
  return FQName{};
}

// Returns path to base directory where fuzzer specs are installed.
static inline const string &GetSpecBaseDir() {
  static const string spec_base_dir = GetExecutableDirectory() + "/data/";
  return spec_base_dir;
}

// Parses a column-separated list of packages into a list of corresponding
// directories.
static vector<string> ParseDirs(const string &packages) {
  vector<string> result{};

  for (const auto &package : Split(packages, ":")) {
    FQName fq_name;
    if (!FQName::parse(package, &fq_name)) {
      cerr << "package list is malformed" << endl;
      std::abort();
    }

    vector<string> components = fq_name.getPackageAndVersionComponents(false);
    string spec_dir = GetSpecBaseDir() + Join(components, '/');
    result.emplace_back(std::move(spec_dir));
  }
  return result;
}

ProtoFuzzerParams ExtractProtoFuzzerStaticParams(int argc, char **argv) {
  FQName package_and_version;
  if (!FQName::parse(STRINGIFY(STATIC_TARGET_FQ_NAME), &package_and_version)) {
    cerr << "STATIC_TARGET_FQ_NAME is malformed" << endl;
    std::abort();
  }

  string spec_data_list = STRINGIFY(STATIC_SPEC_DATA);
  if (spec_data_list.empty()) {
    cerr << "STATIC_SPEC_DATA is malformed" << endl;
    std::abort();
  }

  ProtoFuzzerParams params;
  params.comp_specs_ = ExtractCompSpecs(ParseDirs(spec_data_list));

  // Find first interface in the given package that fits the bill.
  params.target_fq_name_ =
      FindAnyIfaceFQName(package_and_version, params.comp_specs_);
  if (!params.target_fq_name_.isFullyQualified()) {
    cerr << "HAL service name not available in VINTF." << endl;
    std::exit(0);
  }

  // Hard-coded values
  params.exec_size_ = 16;
  return params;
}

}  // namespace fuzzer
}  // namespace vts
}  // namespace android