/*
 * Copyright 2019 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.
 */

#pragma once

#include <chrono>
#include <list>
#include <memory>
#include <string>

#include "common/bidi_queue.h"
#include "common/contextual_callback.h"
#include "hci/acl_connection_interface.h"
#include "hci/address.h"
#include "hci/class_of_device.h"
#include "hci/distance_measurement_interface.h"
#include "hci/hci_interface.h"
#include "hci/hci_packets.h"
#include "hci/inquiry_interface.h"
#include "hci/le_acl_connection_interface.h"
#include "hci/le_advertising_interface.h"
#include "hci/le_iso_interface.h"
#include "hci/le_scanning_interface.h"
#include "hci/le_security_interface.h"
#include "hci/security_interface.h"
#include "module.h"
#include "os/handler.h"

namespace bluetooth {
namespace hci {

class HciLayer : public Module, public HciInterface {
  // LINT.IfChange
public:
  HciLayer();
  HciLayer(const HciLayer&) = delete;
  HciLayer& operator=(const HciLayer&) = delete;

  virtual ~HciLayer();

  void EnqueueCommand(
          std::unique_ptr<CommandBuilder> command,
          common::ContextualOnceCallback<void(CommandCompleteView)> on_complete) override;

  void EnqueueCommand(std::unique_ptr<CommandBuilder> command,
                      common::ContextualOnceCallback<void(CommandStatusView)> on_status) override;

  void EnqueueCommand(std::unique_ptr<CommandBuilder> command,
                      common::ContextualOnceCallback<void(CommandStatusOrCompleteView)>
                              on_status_or_complete) override;

  virtual common::BidiQueueEnd<AclBuilder, AclView>* GetAclQueueEnd();

  virtual common::BidiQueueEnd<ScoBuilder, ScoView>* GetScoQueueEnd();

  virtual common::BidiQueueEnd<IsoBuilder, IsoView>* GetIsoQueueEnd();

  virtual void RegisterEventHandler(EventCode event_code,
                                    common::ContextualCallback<void(EventView)> event_handler);

  virtual void UnregisterEventHandler(EventCode event_code);

  virtual void RegisterLeEventHandler(
          SubeventCode subevent_code,
          common::ContextualCallback<void(LeMetaEventView)> event_handler);

  virtual void UnregisterLeEventHandler(SubeventCode subevent_code);

  virtual void RegisterVendorSpecificEventHandler(
          VseSubeventCode event, common::ContextualCallback<void(VendorSpecificEventView)> handler);

  virtual void UnregisterVendorSpecificEventHandler(VseSubeventCode event);

  virtual void RegisterDefaultVendorSpecificEventHandler(
          common::ContextualCallback<void(VendorSpecificEventView)> handler);

  virtual void UnregisterDefaultVendorSpecificEventHandler();

  virtual void RegisterForDisconnects(
          common::ContextualCallback<void(uint16_t, hci::ErrorCode)> on_disconnect);

  virtual SecurityInterface* GetSecurityInterface(
          common::ContextualCallback<void(EventView)> event_handler);

  virtual LeSecurityInterface* GetLeSecurityInterface(
          common::ContextualCallback<void(LeMetaEventView)> event_handler);

  virtual AclConnectionInterface* GetAclConnectionInterface(
          common::ContextualCallback<void(EventView)> event_handler,
          common::ContextualCallback<void(uint16_t, hci::ErrorCode)> on_disconnect,
          common::ContextualCallback<void(Address, ClassOfDevice)> on_connection_request,
          common::ContextualCallback<void(hci::ErrorCode, uint16_t, uint8_t, uint16_t, uint16_t)>
                  on_read_remote_version_complete);
  virtual void PutAclConnectionInterface();

  virtual LeAclConnectionInterface* GetLeAclConnectionInterface(
          common::ContextualCallback<void(LeMetaEventView)> event_handler,
          common::ContextualCallback<void(uint16_t, hci::ErrorCode)> on_disconnect,
          common::ContextualCallback<void(hci::ErrorCode, uint16_t, uint8_t, uint16_t, uint16_t)>
                  on_read_remote_version_complete);
  virtual void PutLeAclConnectionInterface();

  virtual LeAdvertisingInterface* GetLeAdvertisingInterface(
          common::ContextualCallback<void(LeMetaEventView)> event_handler);

  virtual LeScanningInterface* GetLeScanningInterface(
          common::ContextualCallback<void(LeMetaEventView)> event_handler);

  virtual void RegisterForScoConnectionRequests(
          common::ContextualCallback<void(Address, ClassOfDevice, ConnectionRequestLinkType)>
                  on_sco_connection_request);

  virtual LeIsoInterface* GetLeIsoInterface(
          common::ContextualCallback<void(LeMetaEventView)> event_handler);

  virtual DistanceMeasurementInterface* GetDistanceMeasurementInterface(
          common::ContextualCallback<void(LeMetaEventView)> event_handler);

  std::unique_ptr<InquiryInterface> GetInquiryInterface(
          common::ContextualCallback<void(EventView)> event_handler) override;

  std::string ToString() const override { return "Hci Layer"; }

  static constexpr std::chrono::milliseconds kHciTimeoutMs = std::chrono::milliseconds(2000);
  static constexpr std::chrono::milliseconds kHciTimeoutRestartMs = std::chrono::milliseconds(5000);

  static const ModuleFactory Factory;

protected:
  // LINT.ThenChange(fuzz/fuzz_hci_layer.h)
  void ListDependencies(ModuleList* list) const override;

  void Start() override;

  void StartWithNoHalDependencies(os::Handler* handler);

  void Stop() override;

  virtual void Disconnect(uint16_t handle, ErrorCode reason);
  virtual void ReadRemoteVersion(hci::ErrorCode hci_status, uint16_t handle, uint8_t version,
                                 uint16_t manufacturer_name, uint16_t sub_version);

  std::list<common::ContextualCallback<void(uint16_t, ErrorCode)>> disconnect_handlers_;
  std::list<common::ContextualCallback<void(hci::ErrorCode, uint16_t, uint8_t, uint16_t, uint16_t)>>
          read_remote_version_handlers_;

private:
  struct impl;
  struct hal_callbacks;
  impl* impl_;
  hal_callbacks* hal_callbacks_;

  std::mutex callback_handlers_guard_;
  void on_connection_request(EventView event_view);
  void on_disconnection_complete(EventView event_view);
  void on_read_remote_version_complete(EventView event_view);

  common::ContextualCallback<void(Address bd_addr, ClassOfDevice cod)> on_acl_connection_request_{};
  common::ContextualCallback<void(Address bd_addr, ClassOfDevice cod,
                                  ConnectionRequestLinkType link_type)>
          on_sco_connection_request_{};

  // Interfaces
  CommandInterfaceImpl<AclCommandBuilder> acl_connection_manager_interface_{this};
  CommandInterfaceImpl<AclCommandBuilder> le_acl_connection_manager_interface_{this};
  CommandInterfaceImpl<SecurityCommandBuilder> security_interface{this};
  CommandInterfaceImpl<LeSecurityCommandBuilder> le_security_interface{this};
  CommandInterfaceImpl<LeAdvertisingCommandBuilder> le_advertising_interface{this};
  CommandInterfaceImpl<LeScanningCommandBuilder> le_scanning_interface{this};
  CommandInterfaceImpl<LeIsoCommandBuilder> le_iso_interface{this};
  CommandInterfaceImpl<DistanceMeasurementCommandBuilder> distance_measurement_interface{this};
};
}  // namespace hci
}  // namespace bluetooth