// Copyright 2019 The Fuchsia 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 <fuchsia/device/power/test/llcpp/fidl.h>
#include <lib/fdio/fd.h>
#include <lib/fdio/fdio.h>
#include <lib/fdio/namespace.h>
#include <lib/fdio/spawn.h>
#include <lib/fdio/unsafe.h>
#include <lib/fdio/watcher.h>

#include <ddk/binding.h>
#include <ddk/debug.h>
#include <ddk/device.h>
#include <ddk/driver.h>
#include <ddk/platform-defs.h>
#include <ddktl/device.h>
#include <ddktl/fidl.h>
#include <fbl/alloc_checker.h>
#include <fbl/auto_call.h>

using llcpp::fuchsia::device::DevicePerformanceStateInfo;
using llcpp::fuchsia::device::DevicePowerStateInfo;
using llcpp::fuchsia::device::power::test::TestDevice;

class TestPowerDriverChild;
using DeviceType = ddk::Device<TestPowerDriverChild, ddk::UnbindableNew, ddk::Messageable,
                               ddk::Suspendable, ddk::Resumable, ddk::PerformanceTunable,
                               ddk::AutoSuspendable, ddk::Initializable>;
class TestPowerDriverChild : public DeviceType, public TestDevice::Interface {
 public:
  TestPowerDriverChild(zx_device_t* parent) : DeviceType(parent) {}
  static zx_status_t Create(void* ctx, zx_device_t* device);
  zx_status_t Bind();

  void AddDeviceWithPowerArgs(::fidl::VectorView<DevicePowerStateInfo> info,
                              ::fidl::VectorView<DevicePerformanceStateInfo> perf_states,
                              bool add_invisible,
                              AddDeviceWithPowerArgsCompleter::Sync completer) override;

  void GetCurrentDevicePowerState(GetCurrentDevicePowerStateCompleter::Sync completer) override;
  void GetCurrentSuspendReason(GetCurrentSuspendReasonCompleter::Sync completer) override;
  void GetCurrentDeviceAutoSuspendConfig(
      GetCurrentDeviceAutoSuspendConfigCompleter::Sync completer) override;

  void SetTestStatusInfo(::llcpp::fuchsia::device::power::test::TestStatusInfo test_info,
                         SetTestStatusInfoCompleter::Sync completer) override;

  void DdkUnbindNew(ddk::UnbindTxn txn) { txn.Reply(); }
  zx_status_t DdkMessage(fidl_msg_t* msg, fidl_txn_t* txn) {
    DdkTransaction transaction(txn);
    ::llcpp::fuchsia::device::power::test::TestDevice::Dispatch(this, msg, &transaction);
    return transaction.Status();
  }
  void DdkInit(ddk::InitTxn txn);
  void DdkRelease() { delete this; }
  void DdkSuspend(ddk::SuspendTxn txn);
  zx_status_t DdkSetPerformanceState(uint32_t requested_state, uint32_t* out_state);
  void DdkResume(ddk::ResumeTxn txn);
  zx_status_t DdkConfigureAutoSuspend(bool enable, uint8_t deepest_sleep_state);

  void SavePowerStateInfo(std::unique_ptr<device_power_state_info_t[]> states, uint8_t states_count,
                          std::unique_ptr<device_performance_state_info_t[]> perf_states,
                          uint8_t perf_states_count) {
    states_ = std::move(states);
    states_count_ = states_count;
    perf_states_ = std::move(perf_states);
    perf_states_count_ = perf_states_count;
  }

 private:
  uint8_t current_power_state_ = 0;
  uint32_t current_performance_state_ = 0;
  uint8_t auto_suspend_sleep_state_ = 0;
  bool auto_suspend_enabled_ = false;
  uint8_t current_suspend_reason_ = 0;

  zx_status_t reply_suspend_status_ = ZX_OK;
  zx_status_t reply_resume_status_ = ZX_OK;
  uint8_t reply_out_power_state_ = DEV_POWER_STATE_D0;
  uint32_t reply_out_performance_state_ = DEV_PERFORMANCE_STATE_P0;

  std::unique_ptr<device_power_state_info_t[]> states_;
  uint8_t states_count_ = 0;
  std::unique_ptr<device_performance_state_info_t[]> perf_states_;
  uint8_t perf_states_count_ = 0;
};

void TestPowerDriverChild::DdkInit(ddk::InitTxn txn) {
  txn.Reply(ZX_OK, states_.get(), states_count_, perf_states_.get(), perf_states_count_);
}

void TestPowerDriverChild::DdkSuspend(ddk::SuspendTxn txn) {
  if (reply_suspend_status_ == ZX_OK) {
    reply_out_power_state_ = txn.requested_state();
  }
  current_suspend_reason_ = txn.suspend_reason();
  current_power_state_ = reply_out_power_state_;
  txn.Reply(reply_suspend_status_, reply_out_power_state_);
  reply_suspend_status_ = ZX_OK;
  reply_out_power_state_ = DEV_POWER_STATE_D0;
  reply_out_performance_state_ = DEV_PERFORMANCE_STATE_P0;
}

zx_status_t TestPowerDriverChild::DdkSetPerformanceState(uint32_t requested_state,
                                                         uint32_t* out_state) {
  current_performance_state_ = requested_state;
  *out_state = requested_state;
  return ZX_OK;
}

void TestPowerDriverChild::DdkResume(ddk::ResumeTxn txn) {
  if (reply_resume_status_ == ZX_OK) {
    reply_out_power_state_ = DEV_POWER_STATE_D0;
    reply_out_performance_state_ = txn.requested_state();
  }
  current_power_state_ = reply_out_power_state_;
  current_performance_state_ = reply_out_performance_state_;
  // In a successful response, power state is a working state.
  txn.Reply(reply_resume_status_, reply_out_power_state_, reply_out_performance_state_);
  reply_resume_status_ = ZX_OK;
  reply_out_power_state_ = DEV_POWER_STATE_D0;
  reply_out_performance_state_ = DEV_PERFORMANCE_STATE_P0;
}

zx_status_t TestPowerDriverChild::DdkConfigureAutoSuspend(bool enable,
                                                          uint8_t deepest_sleep_state) {
  auto_suspend_enabled_ = enable;
  auto_suspend_sleep_state_ = deepest_sleep_state;
  return ZX_OK;
}

void TestPowerDriverChild::AddDeviceWithPowerArgs(
    ::fidl::VectorView<DevicePowerStateInfo> info,
    ::fidl::VectorView<DevicePerformanceStateInfo> perf_states, bool add_invisible,
    AddDeviceWithPowerArgsCompleter::Sync completer) {
  fbl::AllocChecker ac;
  auto child2 = fbl::make_unique_checked<TestPowerDriverChild>(&ac, this->parent());
  if (!ac.check()) {
    completer.ReplyError(ZX_ERR_NO_MEMORY);
    return;
  }

  auto state_info = info.data();
  auto states = std::make_unique<device_power_state_info_t[]>(info.count());
  auto count = static_cast<uint8_t>(info.count());
  for (uint8_t i = 0; i < count; i++) {
    states[i].state_id = static_cast<fuchsia_device_DevicePowerState>(state_info[i].state_id);
    states[i].restore_latency = state_info[i].restore_latency;
    states[i].wakeup_capable = state_info[i].wakeup_capable;
    states[i].system_wake_state = state_info[i].system_wake_state;
  }

  auto perf_state_info = perf_states.data();
  auto performance_states =
      std::make_unique<device_performance_state_info_t[]>(perf_states.count());
  auto perf_state_count = static_cast<uint8_t>(perf_states.count());
  for (uint8_t i = 0; i < perf_state_count; i++) {
    performance_states[i].state_id = perf_state_info[i].state_id;
    performance_states[i].restore_latency = perf_state_info[i].restore_latency;
  }

  zx_status_t status;
  if (!add_invisible) {
    status = child2->DdkAdd("power-test-child-2", 0, nullptr, 0, 0, nullptr, ZX_HANDLE_INVALID,
                            states.get(), count, performance_states.get(), perf_state_count);
  } else {
    child2->SavePowerStateInfo(std::move(states), count, std::move(performance_states),
                               perf_state_count);
    status = child2->DdkAdd("power-test-child-2", DEVICE_ADD_INVISIBLE);
  }
  if (status != ZX_OK) {
    completer.ReplyError(status);
  } else {
    completer.ReplySuccess();
    __UNUSED auto ptr = child2.release();
  }
}

void TestPowerDriverChild::SetTestStatusInfo(
    llcpp::fuchsia::device::power::test::TestStatusInfo status_info,
    SetTestStatusInfoCompleter::Sync completer) {
  reply_suspend_status_ = status_info.suspend_status;
  reply_resume_status_ = status_info.resume_status;
  reply_out_power_state_ = status_info.out_power_state;
  reply_out_performance_state_ = status_info.out_performance_state;
  completer.ReplySuccess();
}

void TestPowerDriverChild::GetCurrentDevicePowerState(
    GetCurrentDevicePowerStateCompleter::Sync completer) {
  completer.ReplySuccess(
      static_cast<llcpp::fuchsia::device::DevicePowerState>(current_power_state_));
}

void TestPowerDriverChild::GetCurrentSuspendReason(
    GetCurrentSuspendReasonCompleter::Sync completer) {
  completer.ReplySuccess(current_suspend_reason_);
}

void TestPowerDriverChild::GetCurrentDeviceAutoSuspendConfig(
    GetCurrentDeviceAutoSuspendConfigCompleter::Sync completer) {
  completer.ReplySuccess(
      auto_suspend_enabled_,
      static_cast<llcpp::fuchsia::device::DevicePowerState>(auto_suspend_sleep_state_));
}

zx_status_t TestPowerDriverChild::Bind() { return DdkAdd("power-test-child"); }

zx_status_t TestPowerDriverChild::Create(void* ctx, zx_device_t* device) {
  fbl::AllocChecker ac;
  auto dev = fbl::make_unique_checked<TestPowerDriverChild>(&ac, device);

  if (!ac.check()) {
    return ZX_ERR_NO_MEMORY;
  }
  auto status = dev->Bind();
  if (status == ZX_OK) {
    // devmgr is now in charge of the memory for dev
    __UNUSED auto ptr = dev.release();
  }
  return status;
}

static zx_driver_ops_t test_power_child_driver_ops = []() -> zx_driver_ops_t {
  zx_driver_ops_t ops = {};
  ops.version = DRIVER_OPS_VERSION;
  ops.bind = TestPowerDriverChild::Create;
  return ops;
}();

// clang-format off
ZIRCON_DRIVER_BEGIN(TestPowerChild, test_power_child_driver_ops, "zircon", "0.1", 1)
  BI_MATCH_IF(EQ, BIND_PROTOCOL, ZX_PROTOCOL_TEST_POWER_CHILD),
ZIRCON_DRIVER_END(TestPowerChild)
    // clang-format on