/*
 * 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.
 */

#include "l2cap/classic/internal/fixed_channel_service_manager_impl.h"

#include "common/bind.h"
#include "l2cap/cid.h"
#include "l2cap/classic/internal/fixed_channel_service_impl.h"
#include "os/log.h"

namespace bluetooth {
namespace l2cap {
namespace classic {
namespace internal {

void FixedChannelServiceManagerImpl::Register(Cid cid,
                                              FixedChannelServiceImpl::PendingRegistration pending_registration) {
  if (cid < kFirstFixedChannel || cid > kLastFixedChannel || cid == kClassicSignallingCid) {
    std::unique_ptr<FixedChannelService> invalid_service(new FixedChannelService());
    pending_registration.user_handler_->Post(
        common::BindOnce(std::move(pending_registration.on_registration_complete_callback_),
                         FixedChannelManager::RegistrationResult::FAIL_INVALID_SERVICE, std::move(invalid_service)));
  } else if (IsServiceRegistered(cid)) {
    std::unique_ptr<FixedChannelService> invalid_service(new FixedChannelService());
    pending_registration.user_handler_->Post(
        common::BindOnce(std::move(pending_registration.on_registration_complete_callback_),
                         FixedChannelManager::RegistrationResult::FAIL_DUPLICATE_SERVICE, std::move(invalid_service)));
  } else {
    service_map_.try_emplace(cid,
                             FixedChannelServiceImpl(pending_registration.user_handler_,
                                                     std::move(pending_registration.on_connection_open_callback_)));
    std::unique_ptr<FixedChannelService> user_service(new FixedChannelService(cid, this, l2cap_layer_handler_));
    pending_registration.user_handler_->Post(
        common::BindOnce(std::move(pending_registration.on_registration_complete_callback_),
                         FixedChannelManager::RegistrationResult::SUCCESS, std::move(user_service)));
  }
}

void FixedChannelServiceManagerImpl::Unregister(Cid cid, FixedChannelService::OnUnregisteredCallback callback,
                                                os::Handler* handler) {
  if (IsServiceRegistered(cid)) {
    service_map_.erase(cid);
    handler->Post(std::move(callback));
  } else {
    LOG_ERROR("service not registered cid:%d", cid);
  }
}

bool FixedChannelServiceManagerImpl::IsServiceRegistered(Cid cid) const {
  return service_map_.find(cid) != service_map_.end();
}

FixedChannelServiceImpl* FixedChannelServiceManagerImpl::GetService(Cid cid) {
  ASSERT(IsServiceRegistered(cid));
  return &service_map_.find(cid)->second;
}

std::vector<std::pair<Cid, FixedChannelServiceImpl*>> FixedChannelServiceManagerImpl::GetRegisteredServices() {
  std::vector<std::pair<Cid, FixedChannelServiceImpl*>> results;
  for (auto& elem : service_map_) {
    results.emplace_back(elem.first, &elem.second);
  }
  return results;
}

namespace {
constexpr uint64_t kSignallingChannelMask = 0x02;
constexpr uint64_t kConnectionlessReceptionMask = 0x04;
constexpr uint64_t kBrEdrSecurityManager = 0x80;
}  // namespace

uint64_t FixedChannelServiceManagerImpl::GetSupportedFixedChannelMask() {
  uint64_t result = 0;
  result |= kSignallingChannelMask;  // Signalling channel is mandatory
  for (const auto& elem : service_map_) {
    Cid cid = elem.first;
    switch (cid) {
      case kConnectionlessCid:
        result |= kConnectionlessReceptionMask;
        continue;
      case kSmpBrCid:
        result |= kBrEdrSecurityManager;
        continue;
      default:
        LOG_WARN("Unknown fixed channel is registered: 0x%x", cid);
        continue;
    }
  }
  return result;
}
}  // namespace internal
}  // namespace classic
}  // namespace l2cap
}  // namespace bluetooth