/*
 * Copyright (C) 2023 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 "cuttlefish/host/commands/cvd/cli/commands/powerwash.h"

#include <chrono>
#include <memory>
#include <string>
#include <vector>

#include "cuttlefish/flag_parser/flag.h"
#include "cuttlefish/flag_parser/gflags_compat.h"
#include "cuttlefish/host/commands/cvd/cli/command_request.h"
#include "cuttlefish/host/commands/cvd/cli/commands/command_handler.h"
#include "cuttlefish/host/commands/cvd/cli/selector/selector.h"
#include "cuttlefish/host/commands/cvd/cli/types.h"
#include "cuttlefish/host/commands/cvd/instances/instance_manager.h"
#include "cuttlefish/result/result.h"

namespace cuttlefish {
namespace {

constexpr char kSummaryHelpText[] = "Reset device to first boot state";
constexpr char kDetailedHelpText[] =
    R"(powerwash: Resets device state to first boot. Functionaly equivalent to
removing the device and creating it again, but more efficient.

Flags:
    -boot_timeout (How many seconds to wait for the device to reboot.)
      type: int32 default: 500
    -wait_for_launcher (How many seconds to wait for the launcher to respond to
      the status command. A value of zero means wait indefinitely.) type: int32
      default: 30
)";

constexpr char kPowerwashCmd[] = "powerwash";

struct PowerwashOptions {
  int wait_for_launcher_seconds = 30;
  int boot_timeout_seconds = 500;

  std::vector<Flag> Flags() {
    return {
        GflagsCompatFlag("wait_for_launcher", wait_for_launcher_seconds),
        GflagsCompatFlag("boot_timeout", boot_timeout_seconds),
    };
  }
};
}  // namespace

CvdDevicePowerwashCommandHandler::CvdDevicePowerwashCommandHandler(
    InstanceManager& instance_manager)
    : instance_manager_{instance_manager} {}

Result<void> CvdDevicePowerwashCommandHandler::Handle(
    const CommandRequest& request) {
  PowerwashOptions options;
  std::vector<std::string> subcmd_args = request.SubcommandArguments();
  CF_EXPECT(ConsumeFlags(options.Flags(), subcmd_args,
                         {.fail_on_unexpected_argument = true}));

  auto [instance, unused] =
      CF_EXPECT(selector::SelectInstance(instance_manager_, request),
                "Unable to select an instance");
  CF_EXPECT(instance.PowerWash(
      std::chrono::seconds(options.wait_for_launcher_seconds),
      std::chrono::seconds(options.boot_timeout_seconds)));
  return {};
}

cvd_common::Args CvdDevicePowerwashCommandHandler::CmdList() const {
  return {kPowerwashCmd};
}

std::string CvdDevicePowerwashCommandHandler::SummaryHelp() const {
  return kSummaryHelpText;
}

bool CvdDevicePowerwashCommandHandler::RequiresDeviceExists() const {
  return true;
}

Result<std::string> CvdDevicePowerwashCommandHandler::DetailedHelp(
    const CommandRequest& request) {
  return kDetailedHelpText;
}

std::unique_ptr<CvdCommandHandler> NewCvdDevicePowerwashCommandHandler(
    InstanceManager& instance_manager) {
  return std::unique_ptr<CvdCommandHandler>(
      new CvdDevicePowerwashCommandHandler(instance_manager));
}

}  // namespace cuttlefish
