/*
 * Copyright (c) 2022 Huawei Device Co., Ltd.
 * 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 "background_audio_controller.h"
#include "avsession_log.h"
#include "avsession_service.h"
#include "avsession_item.h"
#include "permission_checker.h"

namespace OHOS::AVSession {
using AudioStandard::RendererState;

BackgroundAudioController::BackgroundAudioController() : ptr_(nullptr)
{
    SLOGI("construct");
}

BackgroundAudioController::~BackgroundAudioController()
{
    SLOGI("destroy");
}

void BackgroundAudioController::Init(AVSessionService *ptr)
{
    ptr_ = ptr;
    AudioAdapter::GetInstance().AddStreamRendererStateListener([this](const auto& infos) {
        HandleAudioStreamRendererStateChange(infos);
    });
    AppManagerAdapter::GetInstance().SetAppBackgroundStateObserver([this](int32_t uid) {
        HandleAppBackgroundState(uid);
    });
}

void BackgroundAudioController::OnSessionCreate(const AVSessionDescriptor& descriptor)
{
    std::lock_guard lockGuard(lock_);
    sessionUIDs_.insert(descriptor.uid_);
    AppManagerAdapter::GetInstance().RemoveObservedApp(descriptor.uid_);
}

void BackgroundAudioController::OnSessionRelease(const AVSessionDescriptor& descriptor)
{
    {
        std::lock_guard lockGuard(lock_);
        sessionUIDs_.erase(descriptor.uid_);
    }

    if (descriptor.isThirdPartyApp_) {
        if (!AppManagerAdapter::GetInstance().IsAppBackground(descriptor.uid_)) {
            AppManagerAdapter::GetInstance().AddObservedApp(descriptor.uid_);
            return;
        }
        int32_t uid = descriptor.uid_;
        AudioStandard::RendererState rendererState = AudioStandard::RENDERER_PAUSED;
        bool isSuccess = AudioAdapter::GetInstance().GetRendererState(uid, rendererState);
        if (isSuccess && rendererState != AudioStandard::RENDERER_RUNNING) {
            SLOGI("renderer state is not AudioStandard::RENDERER_RUNNING");
            return;
        }
        SLOGI("pause uid=%{public}d", descriptor.uid_);
        ptr_->NotifyAudioSessionCheckTrigger(descriptor.uid_);
        AudioAdapter::GetInstance().PauseAudioStream(descriptor.uid_);
    }
}

void BackgroundAudioController::HandleAudioStreamRendererStateChange(const AudioRendererChangeInfos& infos)
{
    for (const auto& info : infos) {
        if (info->rendererState != AudioStandard::RENDERER_RUNNING) {
            continue;
        }
        {
            std::lock_guard lockGuard(lock_);
            auto it = sessionUIDs_.find(info->clientUID);
            if (it != sessionUIDs_.end()) {
                SLOGI("uid=%{public}d has session", info->clientUID);
                continue;
            }
        }
        if (PermissionChecker::GetInstance().CheckSystemPermissionByUid(info->clientUID)) {
            SLOGI("uid=%{public}d is system app", info->clientUID);
            continue;
        }

        if (!AppManagerAdapter::GetInstance().IsAppBackground(info->clientUID)) {
            AppManagerAdapter::GetInstance().AddObservedApp(info->clientUID);
            continue;
        }
        SLOGI("pause uid=%{public}d", info->clientUID);
        ptr_->NotifyAudioSessionCheckTrigger(info->clientUID);
        AudioAdapter::GetInstance().PauseAudioStream(info->clientUID);
    }
}

void BackgroundAudioController::HandleAppBackgroundState(int32_t uid) const
{
    AudioStandard::RendererState rendererState = AudioStandard::RENDERER_PAUSED;
    bool isSuccess = AudioAdapter::GetInstance().GetRendererState(uid, rendererState);
    if (isSuccess) {
        SLOGI("pause uid=%{public}d", uid);
        ptr_->NotifyAudioSessionCheckTrigger(uid);
        AudioAdapter::GetInstance().PauseAudioStream(uid);
    }
    SLOGI("renderer state is not AudioStandard::RENDERER_RUNNING");
}
}