/*
 * Copyright (C) 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.
 */

#ifndef CPP_EVS_MANAGER_1_1_ENUMERATOR_H_
#define CPP_EVS_MANAGER_1_1_ENUMERATOR_H_

#include "HalCamera.h"
#include "IEnumeratorManager.h"
#include "IPermissionsChecker.h"
#include "ServiceFactory.h"
#include "VirtualCamera.h"
#include "emul/EvsEmulatedCamera.h"
#include "stats/IStatsCollector.h"
#include "stats/StatsCollector.h"

#include <android/hardware/automotive/evs/1.1/IEvsDisplay.h>
#include <android/hardware/automotive/evs/1.1/IEvsEnumerator.h>
#include <android/hardware/camera/device/3.2/ICameraDevice.h>
#include <system/camera_metadata.h>

#include <list>
#include <memory>
#include <unordered_map>
#include <unordered_set>

namespace android::automotive::evs::V1_1::implementation {

// Passthrough to remove static cling and allow for mocking.
class ProdServiceFactory : public ServiceFactory {
public:
    explicit ProdServiceFactory(const char* hardwareServiceName) :
          mService(IEvsEnumerator::getService(hardwareServiceName)) {}
    virtual ~ProdServiceFactory() = default;

    ::android::hardware::automotive::evs::V1_1::IEvsEnumerator* getService() override {
        return mService.get();
    }

private:
    sp<::android::hardware::automotive::evs::V1_1::IEvsEnumerator> mService;
};

class Enumerator : public IEvsEnumerator {
public:
    // For testing.
    explicit Enumerator(std::unique_ptr<ServiceFactory> serviceFactory,
                        std::unique_ptr<IStatsCollector> statsCollector,
                        std::unique_ptr<IPermissionsChecker> permissionChecker);

    static std::unique_ptr<Enumerator> build(const char* hardwareServiceName);
    static std::unique_ptr<Enumerator> build(
            std::unique_ptr<ServiceFactory> serviceFactory,
            std::unique_ptr<IStatsCollector> statsCollector,
            std::unique_ptr<IPermissionsChecker> permissionChecker);

    virtual ~Enumerator() = default;

    // Methods from hardware::automotive::evs::V1_0::IEvsEnumerator follow.
    hardware::Return<void> getCameraList(getCameraList_cb _hidl_cb) override;
    hardware::Return<sp<hardware::automotive::evs::V1_0::IEvsCamera>> openCamera(
            const hardware::hidl_string& cameraId) override;
    hardware::Return<void> closeCamera(
            const ::android::sp<hardware::automotive::evs::V1_0::IEvsCamera>& virtualCamera)
            override;
    hardware::Return<sp<hardware::automotive::evs::V1_0::IEvsDisplay>> openDisplay() override;
    hardware::Return<void> closeDisplay(
            const ::android::sp<hardware::automotive::evs::V1_0::IEvsDisplay>& display) override;
    hardware::Return<hardware::automotive::evs::V1_0::DisplayState> getDisplayState() override;

    // Methods from hardware::automotive::evs::V1_1::IEvsEnumerator follow.
    hardware::Return<void> getCameraList_1_1(getCameraList_1_1_cb _hidl_cb) override;
    hardware::Return<sp<hardware::automotive::evs::V1_1::IEvsCamera>> openCamera_1_1(
            const hardware::hidl_string& cameraId,
            const hardware::camera::device::V3_2::Stream& streamCfg) override;
    hardware::Return<bool> isHardware() override { return false; }
    hardware::Return<void> getDisplayIdList(getDisplayIdList_cb _list_cb) override;
    hardware::Return<sp<hardware::automotive::evs::V1_1::IEvsDisplay>> openDisplay_1_1(
            uint8_t id) override;
    hardware::Return<void> getUltrasonicsArrayList(getUltrasonicsArrayList_cb _hidl_cb) override;
    hardware::Return<sp<IEvsUltrasonicsArray>> openUltrasonicsArray(
            const hardware::hidl_string& ultrasonicsArrayId) override;
    hardware::Return<void> closeUltrasonicsArray(
            const ::android::sp<IEvsUltrasonicsArray>& evsUltrasonicsArray) override;

    // Methods from ::android.hidl.base::V1_0::IBase follow.
    hardware::Return<void> debug(const hardware::hidl_handle& fd,
                                 const hidl_vec<hardware::hidl_string>& options) override;

private:
    bool isLogicalCamera(const camera_metadata_t* metadata);
    std::unordered_set<std::string> getPhysicalCameraIds(const std::string& id);

    const std::unique_ptr<ServiceFactory> mServiceFactory;
    const std::unique_ptr<IStatsCollector> mStatsCollector;
    const std::unique_ptr<IPermissionsChecker> mPermissionChecker;

    wp<hardware::automotive::evs::V1_0::IEvsDisplay> mActiveDisplay;

    // List of active camera proxy objects that wrap hw cameras
    std::unordered_map<std::string, sp<HalCamera>> mActiveCameras;

    // List of camera descriptors of enumerated hw cameras
    std::unordered_map<std::string, CameraDesc> mCameraDevices;

    // List of available physical display devices
    std::list<uint8_t> mDisplayPorts;

    // Display port the internal display is connected to.
    uint8_t mInternalDisplayPort;

    // Boolean flag to tell whether the camera usages are being monitored or not.
    bool mMonitorEnabled = false;

    // Boolean flag to tell whether EvsDisplay is owned exclusively or not.
    bool mDisplayOwnedExclusively = false;

    // LSHAL dump
    void cmdDump(int fd, const hidl_vec<hardware::hidl_string>& options);
    void cmdHelp(int fd);
    void cmdList(int fd, const hidl_vec<hardware::hidl_string>& options);
    void cmdDumpDevice(int fd, const hidl_vec<hardware::hidl_string>& options);

    // List of emulated camera devices
    std::unordered_map<std::string, EmulatedCameraDesc> mEmulatedCameraDevices;

    // LSHAL command to use emulated camera device
    void cmdConfigureEmulatedCamera(int fd, const hidl_vec<hardware::hidl_string>& options);
};

}  // namespace android::automotive::evs::V1_1::implementation

#endif  // CPP_EVS_MANAGER_1_1_ENUMERATOR_H_