// Copyright 2015 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 <sysexits.h>

#include <map>
#include <memory>
#include <string>

#include <base/command_line.h>
#include <base/logging.h>
#include <chromeos/any.h>
#include <chromeos/daemons/dbus_daemon.h>
#include <chromeos/dbus/service_constants.h>

#include "shill/dbus_proxies/shill_proxies.h"

namespace {

namespace switches {
static const char kHelp[] = "help";
static const char kPassphrase[] = "passphrase";
static const char kHexSsid[] = "hex-ssid";
static const char kSSID[] = "ssid";
static const char kHelpMessage[] = "\n"
    "Available Switches: \n"
    "  --ssid=<ssid>\n"
    "    Set the SSID to configure (mandatory).\n"
    "  --hex-ssid\n"
    "    SSID is provided in hexadecimal\n"
    "  --passphrase=<passprhase>\n"
    "    Set the passphrase for PSK networks\n";
}  // namespace switches

}  // namespace

class MyClient : public chromeos::DBusDaemon {
 public:
  MyClient(std::string ssid, bool is_hex_ssid, std::string psk)
      : ssid_(ssid), is_hex_ssid_(is_hex_ssid), psk_(psk) {}
  ~MyClient() override = default;

 protected:
  int OnInit() override {
    int ret = DBusDaemon::OnInit();
    if (ret != EX_OK) {
      return ret;
    }
    ConfigureAndConnect();
    Quit();
    return EX_OK;
  }

  bool ConfigureAndConnect() {
    std::unique_ptr<org::chromium::flimflam::ManagerProxy> shill_manager_proxy(
        new org::chromium::flimflam::ManagerProxy(
            bus_, shill::kFlimflamServiceName,
            dbus::ObjectPath(shill::kFlimflamServicePath)));

    dbus::ObjectPath created_service;
    chromeos::ErrorPtr configure_error;
    if (!shill_manager_proxy->ConfigureService(
            GetServiceConfig(), &created_service, &configure_error)) {
      LOG(ERROR) << "Configure service failed";
      return false;
    }

    chromeos::ErrorPtr connect_error;
    std::unique_ptr<org::chromium::flimflam::ServiceProxy> shill_service_proxy(
        new org::chromium::flimflam::ServiceProxy(
            bus_, shill::kFlimflamServiceName, created_service));
    if (!shill_service_proxy->Connect(&connect_error)) {
      LOG(ERROR) << "Connect service failed";
      return false;
    }

    // TODO(pstew): Monitor service as it attempts to connect.

    return true;
  }

  std::map<std::string, chromeos::Any> GetServiceConfig() {
    std::map<std::string, chromeos::Any> configure_dict;
    configure_dict[shill::kTypeProperty] = shill::kTypeWifi;
    if (is_hex_ssid_) {
      configure_dict[shill::kWifiHexSsid] = ssid_;
    } else {
      configure_dict[shill::kSSIDProperty] = ssid_;
    }
    if (!psk_.empty()) {
      configure_dict[shill::kPassphraseProperty] = psk_;
      configure_dict[shill::kSecurityProperty] = shill::kSecurityPsk;
    }
    return configure_dict;
  }

  std::string ssid_;
  bool is_hex_ssid_;
  std::string psk_;
};

int main(int argc, char** argv) {
  base::CommandLine::Init(argc, argv);
  base::CommandLine* cl = base::CommandLine::ForCurrentProcess();

  if (cl->HasSwitch(switches::kHelp)) {
    LOG(INFO) << switches::kHelpMessage;
    return EXIT_SUCCESS;
  }

  if (!cl->HasSwitch(switches::kSSID)) {
    LOG(ERROR) << "ssid switch is mandatory.";
    LOG(ERROR) << switches::kHelpMessage;
    return EXIT_FAILURE;
  }

  std::string ssid = cl->GetSwitchValueASCII(switches::kSSID);
  std::string psk;
  if (cl->HasSwitch(switches::kPassphrase)) {
    psk = cl->GetSwitchValueASCII(switches::kPassphrase);
  }
  bool hex_ssid = cl->HasSwitch(switches::kHexSsid);

  MyClient client(ssid, hex_ssid, psk);
  client.Run();
  LOG(INFO) << "Process exiting.";

  return EXIT_SUCCESS;
}