// Copyright 2021 Google LLC. All Rights Reserved. This file and proprietary
// source code may only be used and distributed under the Widevine License
// Agreement.

#include <assert.h>
#include <gtest/gtest.h>
#include <string.h>
#include <time.h>
#include <algorithm>
#include <fstream>
#include <iostream>
#include <string>
#include <vector>

#include "cdm.h"
#include "log.h"
#include "oec_device_features.h"
#include "stderr_logger.h"
#include "test_base.h"
#include "test_host.h"

CDM_NAMESPACE::StderrLogger g_stderr_logger;
std::string g_sandbox_id;

namespace CDM_NAMESPACE {
namespace {
constexpr char kSandboxIdParam[] = "--sandbox_id=";
constexpr char kCertPathParam[] = "--cert_path=";
constexpr char kCertKeyPathParam[] = "--cert_key_path=";

// Following the pattern established by help text in test_base.cpp
constexpr char kExtraHelpText[] =
    "  --sandbox_id=<sandbox_id>\n"
    "    Specifies the Sandbox ID that should be sent to OEMCrypto via\n"
    "    OEMCrypto_SetSandbox(). On most platforms, since Sandbox IDs are not\n"
    "    in use, this parameter should be omitted.\n"
    "  --cert_path=<cert_path>\n"
    "    Path to a preloaded DRM certificate. This may speed up some tests\n"
    "    by skipping the provisioning step. On most platforms, this parameter\n"
    "    parameter should be omitted.\n"
    "  --cert_key_path=<cert_key_path>\n"
    "    Path to a key in preloaded DRM certificate. This should only be used\n"
    "    if the device has a baked in cert.\n";

bool ReadFile(const std::string& path, std::string* output) {
  output->clear();
  std::ifstream fs(path, std::ios::in | std::ios::binary);
  if (!fs) {
    LOGE("Failed to open %s: %s", path.c_str(), strerror(errno));
    return false;
  }
  std::stringstream buffer;
  buffer << fs.rdbuf();
  *output = buffer.str();
  return true;
}

// Reads a file from the command line arguments.
// The file path is expected to be the first argument after the flag.
// For example, if the flag is "--cert_path=" and the command line is
//   cdm_test_runner --cert_path=/path/to/cert
// then the file at /path/to/cert will be read.
// The flag will be removed from the command line arguments.
bool ReadFileFromArg(const char* path_flag, std::vector<std::string>& args,
                     std::string* data) {
  auto path_iter = std::find_if(std::begin(args) + 1, std::end(args),
                                [path_flag](const std::string& elem) -> bool {
                                  return elem.find(path_flag) == 0;
                                });
  if (path_iter != std::end(args)) {
    const std::string path = path_iter->substr(strlen(path_flag));
    args.erase(path_iter);
    return ReadFile(path, data);
  }
  return false;
}

}  // namespace

int Main(Cdm::IStorage* storage, Cdm::IClock* clock, Cdm::ITimer* timer,
         Cdm::ILogger* logger, int argc, char** argv) {
  // Find and filter out the Sandbox ID, if any.
  std::vector<std::string> args(argv, argv + argc);
  auto sandbox_id_iter = std::find_if(std::begin(args) + 1, std::end(args),
                                      [](const std::string& elem) -> bool {
                                        return elem.find(kSandboxIdParam) == 0;
                                      });
  if (sandbox_id_iter != std::end(args)) {
    g_sandbox_id = sandbox_id_iter->substr(strlen(kSandboxIdParam));
    args.erase(sandbox_id_iter);
  }

  Cdm::Status status = Cdm::initialize(
      Cdm::kOpaqueHandle, storage, clock, timer, logger,
      static_cast<Cdm::LogLevel>(wvutil::g_cutoff), g_sandbox_id);
  (void)status;  // status is now used when assertions are turned off.
  assert(status == Cdm::kSuccess);

  std::string data;
  if (ReadFileFromArg(kCertPathParam, args, &data)) {
    g_host->set_baked_in_cert(data);
  }
  if (ReadFileFromArg(kCertKeyPathParam, args, &data)) {
    wvoec::global_features.set_rsa_test_key(
        std::vector<uint8_t>(data.begin(), data.end()));
  }

  std::vector<const char*> new_argv(args.size());
  std::transform(
      std::begin(args), std::end(args), std::begin(new_argv),
      [](const std::string& arg) -> const char* { return arg.c_str(); });
  // This must take place after the call to Cdm::initialize() because it makes
  // calls that are only valid after the library is initialized.
  if (!wvcdm::WvCdmTestBase::Initialize(static_cast<int>(new_argv.size()),
                                        new_argv.data(), kExtraHelpText)) {
    return 1;
  }

  // Init gtest after oemcrypto and cdm host have been initialized.
  ::testing::InitGoogleTest(&argc, argv);

  return RUN_ALL_TESTS();
}
}  // namespace CDM_NAMESPACE