/*
 * Copyright (C) 2016 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 ANDROID_HARDWARE_AUTOMOTIVE_EVS_V1_1_EVSCAMERAENUMERATOR_H
#define ANDROID_HARDWARE_AUTOMOTIVE_EVS_V1_1_EVSCAMERAENUMERATOR_H

#include "ConfigManager.h"

#include <android/frameworks/automotive/display/1.0/IAutomotiveDisplayProxyService.h>
#include <android/hardware/automotive/evs/1.1/IEvsCamera.h>
#include <android/hardware/automotive/evs/1.1/IEvsEnumerator.h>
#include <android/hardware/camera/device/3.2/ICameraDevice.h>

#include <atomic>
#include <thread>
#include <unordered_map>

namespace android {
namespace hardware {
namespace automotive {
namespace evs {
namespace V1_1 {
namespace implementation {

using ::android::frameworks::automotive::display::V1_0::IAutomotiveDisplayProxyService;
using ::android::hardware::camera::device::V3_2::Stream;

using EvsDisplayState = ::android::hardware::automotive::evs::V1_0::DisplayState;
using IEvsCamera_1_0 = ::android::hardware::automotive::evs::V1_0::IEvsCamera;
using IEvsCamera_1_1 = ::android::hardware::automotive::evs::V1_1::IEvsCamera;
using IEvsDisplay_1_0 = ::android::hardware::automotive::evs::V1_0::IEvsDisplay;
using IEvsDisplay_1_1 = ::android::hardware::automotive::evs::V1_1::IEvsDisplay;

class EvsV4lCamera;  // from EvsCamera.h
class EvsGlDisplay;  // from EvsGlDisplay.h

class EvsEnumerator : public IEvsEnumerator {
public:
    // Methods from ::android::hardware::automotive::evs::V1_0::IEvsEnumerator follow.
    Return<void> getCameraList(getCameraList_cb _hidl_cb) override;
    Return<sp<IEvsCamera_1_0>> openCamera(const hidl_string& cameraId) override;
    Return<void> closeCamera(const ::android::sp<IEvsCamera_1_0>& pCamera) override;
    Return<sp<IEvsDisplay_1_0>> openDisplay() override;
    Return<void> closeDisplay(const ::android::sp<IEvsDisplay_1_0>& display) override;
    Return<EvsDisplayState> getDisplayState() override;

    // Methods from ::android::hardware::automotive::evs::V1_1::IEvsEnumerator follow.
    Return<void> getCameraList_1_1(getCameraList_1_1_cb _hidl_cb) override;
    Return<sp<IEvsCamera_1_1>> openCamera_1_1(const hidl_string& cameraId,
                                              const Stream& streamCfg) override;
    Return<bool> isHardware() override { return true; }
    Return<void> getDisplayIdList(getDisplayIdList_cb _list_cb) override;
    Return<sp<IEvsDisplay_1_1>> openDisplay_1_1(uint8_t port) override;
    Return<void> getUltrasonicsArrayList(getUltrasonicsArrayList_cb _hidl_cb) override;
    Return<sp<IEvsUltrasonicsArray>> openUltrasonicsArray(
            const hidl_string& ultrasonicsArrayId) override;
    Return<void> closeUltrasonicsArray(
            const ::android::sp<IEvsUltrasonicsArray>& evsUltrasonicsArray) override;

    // Implementation details
    EvsEnumerator(sp<IAutomotiveDisplayProxyService> proxyService = nullptr);

    // Monitor the device directory
    static void EvsHotplugThread(std::atomic<bool>& running);

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

private:
    struct CameraRecord {
        V1_1::CameraDesc desc;
        android::wp<EvsV4lCamera> activeInstance;

        CameraRecord(const char* cameraId) : desc() { desc.v1.cameraId = cameraId; }
    };

    bool checkPermission();

    static bool qualifyCaptureDevice(const char* deviceName);
    static CameraRecord* findCameraById(const std::string& cameraId);
    static void enumerateCameras();
    static void enumerateDisplays();

    void closeCamera_impl(const sp<IEvsCamera_1_0>& pCamera, const std::string& cameraId);

    // NOTE:  All members values are static so that all clients operate on the same state
    //        That is to say, this is effectively a singleton despite the fact that HIDL
    //        constructs a new instance for each client.
    //        Because our server has a single thread in the thread pool, these values are
    //        never accessed concurrently despite potentially having multiple instance objects
    //        using them.
    static std::unordered_map<std::string, CameraRecord> sCameraList;

    static wp<EvsGlDisplay> sActiveDisplay;  // Weak pointer.
                                             // Object destructs if client dies.

    static std::mutex sLock;                       // Mutex on shared camera device list.
    static std::condition_variable sCameraSignal;  // Signal on camera device addition.

    static std::unique_ptr<ConfigManager> sConfigManager;  // ConfigManager

    static sp<IAutomotiveDisplayProxyService> sDisplayProxy;
    static std::unordered_map<uint8_t, uint64_t> sDisplayPortList;
    static uint64_t sInternalDisplayId;

    // LSHAL debug command implementations
    void parseCommand(int fd, const hidl_vec<hidl_string>& options);
    void cmdHelp(int fd);
    void cmdDump(int fd, const hidl_vec<hidl_string>& options);
};

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

#endif  // ANDROID_HARDWARE_AUTOMOTIVE_EVS_V1_1_EVSCAMERAENUMERATOR_H