/* Copyright 2019 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.
 */

#include "hardware_verifier/cli.h"

#include <iostream>
#include <sstream>
#include <string>

#include <base/files/file_path.h>
#include <base/logging.h>
#include <base/optional.h>
#include <google/protobuf/io/zero_copy_stream_impl.h>
#include <google/protobuf/text_format.h>
#include <google/protobuf/util/json_util.h>
#include <runtime_probe/proto_bindings/runtime_probe.pb.h>

#include "hardware_verifier/hardware_verifier.pb.h"
#include "hardware_verifier/hw_verification_spec_getter_impl.h"
#include "hardware_verifier/metrics.h"
#include "hardware_verifier/probe_result_getter_impl.h"
#include "hardware_verifier/verifier_impl.h"

namespace hardware_verifier {

namespace {

base::Optional<std::string> OutputInTextFormat(
    HwVerificationReport hw_verification_report) {
  std::stringstream ss;
  const auto generic_device_info = hw_verification_report.generic_device_info();
  hw_verification_report.clear_generic_device_info();

  // Output the AVL qualification status in JSON format.
  auto json_print_opts = google::protobuf::util::JsonPrintOptions();
  json_print_opts.add_whitespace = true;
  json_print_opts.always_print_primitive_fields = true;
  std::string json_output_data;
  const auto convert_status = google::protobuf::util::MessageToJsonString(
      hw_verification_report, &json_output_data, json_print_opts);
  if (!convert_status.ok()) {
    LOG(ERROR) << "Failed to output the qualification report in JSON: "
               << convert_status.ToString() << ".";
    return base::nullopt;
  }
  ss << "[Component Qualification Status]\n" << json_output_data;

  // Output the generic device info in prototxt format.
  ss << "\n[Generic Device Info]\n";
  {
    // Enclose google::protobuf::io::OstreamOutputStream in another nested
    // scope so that its data will be flushed while being destroyed.
    google::protobuf::io::OstreamOutputStream ostream_output_stream{&ss};
    if (!google::protobuf::TextFormat::Print(generic_device_info,
                                             &ostream_output_stream)) {
      LOG(ERROR)
          << "Failed to output the generic device info in prototxt format.";
      return base::nullopt;
    }
  }
  return ss.str();
}

}  // namespace

CLI::CLI()
    : pr_getter_(std::make_unique<ProbeResultGetterImpl>()),
      vp_getter_(std::make_unique<HwVerificationSpecGetterImpl>()),
      verifier_(std::make_unique<VerifierImpl>()),
      output_stream_(&std::cout) {}

CLIVerificationResult CLI::Run(const std::string& probe_result_file,
                               const std::string& hw_verification_spec_file,
                               const CLIOutputFormat output_format,
                               Metrics* metrics) {
  LOG(INFO) << "Get the probe result.";
  base::Optional<runtime_probe::ProbeResult> probe_result;
  if (probe_result_file.empty()) {
    metrics->StartTimer(hardware_verifier::kMetricTimeToProbe);
    probe_result = pr_getter_->GetFromRuntimeProbe();
    metrics->StopTimer(hardware_verifier::kMetricTimeToProbe);

    if (!probe_result) {
      return CLIVerificationResult::kProbeFail;
    }
  } else {
    probe_result = pr_getter_->GetFromFile(base::FilePath(probe_result_file));
    if (!probe_result) {
      return CLIVerificationResult::kInvalidProbeResultFile;
    }
  }

  LOG(INFO) << "Get the verification payload.";
  base::Optional<HwVerificationSpec> hw_verification_spec;
  if (hw_verification_spec_file.empty()) {
    hw_verification_spec = vp_getter_->GetDefault();
  } else {
    hw_verification_spec =
        vp_getter_->GetFromFile(base::FilePath(hw_verification_spec_file));
  }
  if (!hw_verification_spec) {
    return CLIVerificationResult::kInvalidHwVerificationSpecFile;
  }

  LOG(INFO) << "Verify the probe result by the verification payload.";
  const auto verifier_result =
      verifier_->Verify(probe_result.value(), hw_verification_spec.value());
  if (!verifier_result) {
    return CLIVerificationResult::kProbeResultHwVerificationSpecMisalignment;
  }
  const auto hw_verification_report = verifier_result.value();

  LOG(INFO) << "Output the report.";
  switch (output_format) {
    case CLIOutputFormat::kProtoBin: {
      std::string s;
      if (!hw_verification_report.SerializeToString(&s)) {
        return CLIVerificationResult::kUnknownError;
      }
      LOG(INFO) << "Output the report in protobuf binary format, " << s.size()
                << "bytes.";
      *output_stream_ << s;
      break;
    }
    case CLIOutputFormat::kText: {
      auto output_data = OutputInTextFormat(hw_verification_report);
      if (!output_data.has_value()) {
        return CLIVerificationResult::kUnknownError;
      }
      LOG(INFO) << "Output the report in text format:";
      LOG(INFO) << output_data.value();
      *output_stream_ << output_data.value();
    }
  }

  return (hw_verification_report.is_compliant() ? CLIVerificationResult::kPass
                                                : CLIVerificationResult::kFail);
}

}  // namespace hardware_verifier