/* Copyright (c) 2012-2015, The Linux Foundataion. All rights reserved.
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* modification, are permitted provided that the following conditions are
* met:
*     * Redistributions of source code must retain the above copyright
*       notice, this list of conditions and the following disclaimer.
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*       copyright notice, this list of conditions and the following
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#define LOG_TAG "QCamera2Factory"
//#define LOG_NDEBUG 0

#include <stdlib.h>
#include <utils/Log.h>
#include <utils/Errors.h>
#include <hardware/camera.h>
#include <hardware/camera3.h>

#include "HAL/QCamera2HWI.h"
#include "HAL3/QCamera3HWI.h"
#include "util/QCameraFlash.h"
#include "QCamera2Factory.h"

using namespace android;

namespace qcamera {

QCamera2Factory *gQCamera2Factory = NULL;

/*===========================================================================
 * FUNCTION   : QCamera2Factory
 *
 * DESCRIPTION: default constructor of QCamera2Factory
 *
 * PARAMETERS : none
 *
 * RETURN     : None
 *==========================================================================*/
QCamera2Factory::QCamera2Factory()
{
    camera_info info;
    int i = 0;
    mHalDescriptors = NULL;
    mCallbacks = NULL;
    mNumOfCameras = get_num_of_cameras();
    char prop[PROPERTY_VALUE_MAX];
    property_get("persist.camera.HAL3.enabled", prop, "0");
    int isHAL3Enabled = atoi(prop);
    //Query camera at this point in order
    //to avoid any delays during subsequent
    //calls to 'getCameraInfo()'
    for (int i = 0 ; i < mNumOfCameras ; i++) {
        getCameraInfo(i, &info);
    }
    //

    if ((mNumOfCameras > 0) && (mNumOfCameras <= MM_CAMERA_MAX_NUM_SENSORS)) {
        mHalDescriptors = new hal_desc[mNumOfCameras];
        if ( NULL != mHalDescriptors) {
            uint32_t cameraId = 0;

            for (; i < mNumOfCameras ; i++, cameraId++) {
                mHalDescriptors[i].cameraId = cameraId;
                if (isHAL3Enabled) {
                    mHalDescriptors[i].device_version = CAMERA_DEVICE_API_VERSION_3_0;
                } else {
                    mHalDescriptors[i].device_version = CAMERA_DEVICE_API_VERSION_1_0;
                }
            }
        } else {
            ALOGE("%s: Not enough resources to allocate HAL descriptor table!",
                  __func__);
        }
    } else {
        ALOGE("%s: %d camera devices detected!", __func__, mNumOfCameras);
    }
}

/*===========================================================================
 * FUNCTION   : ~QCamera2Factory
 *
 * DESCRIPTION: deconstructor of QCamera2Factory
 *
 * PARAMETERS : none
 *
 * RETURN     : None
 *==========================================================================*/
QCamera2Factory::~QCamera2Factory()
{
    if ( NULL != mHalDescriptors ) {
        delete [] mHalDescriptors;
    }
}

/*===========================================================================
 * FUNCTION   : get_number_of_cameras
 *
 * DESCRIPTION: static function to query number of cameras detected
 *
 * PARAMETERS : none
 *
 * RETURN     : number of cameras detected
 *==========================================================================*/
int QCamera2Factory::get_number_of_cameras()
{
    if (!gQCamera2Factory) {
        gQCamera2Factory = new QCamera2Factory();
        if (!gQCamera2Factory) {
            ALOGE("%s: Failed to allocate Camera2Factory object", __func__);
            return 0;
        }
    }
    return gQCamera2Factory->getNumberOfCameras();
}

/*===========================================================================
 * FUNCTION   : get_camera_info
 *
 * DESCRIPTION: static function to query camera information with its ID
 *
 * PARAMETERS :
 *   @camera_id : camera ID
 *   @info      : ptr to camera info struct
 *
 * RETURN     : int32_t type of status
 *              NO_ERROR  -- success
 *              none-zero failure code
 *==========================================================================*/
int QCamera2Factory::get_camera_info(int camera_id, struct camera_info *info)
{
    return gQCamera2Factory->getCameraInfo(camera_id, info);
}

/*===========================================================================
 * FUNCTION   : set_callbacks
 *
 * DESCRIPTION: static function to set callbacks function to camera module
 *
 * PARAMETERS :
 *   @callbacks : ptr to callback functions
 *
 * RETURN     : NO_ERROR  -- success
 *              none-zero failure code
 *==========================================================================*/
int QCamera2Factory::set_callbacks(const camera_module_callbacks_t *callbacks)
{
    return gQCamera2Factory->setCallbacks(callbacks);
}

/*===========================================================================
 * FUNCTION   : open_legacy
 *
 * DESCRIPTION: Function to open older hal version implementation
 *
 * PARAMETERS :
 *   @hw_device : ptr to struct storing camera hardware device info
 *   @camera_id : camera ID
 *   @halVersion: Based on camera_module_t.common.module_api_version
 *
 * RETURN     : 0  -- success
 *              none-zero failure code
 *==========================================================================*/
int QCamera2Factory::open_legacy(const struct hw_module_t* module,
            const char* id, uint32_t halVersion, struct hw_device_t** device)
{
    return -ENOSYS;
}

/*===========================================================================
 * FUNCTION   : set_torch_mode
 *
 * DESCRIPTION: Attempt to turn on or off the torch mode of the flash unit.
 *
 * PARAMETERS :
 *   @camera_id : camera ID
 *   @on        : Indicates whether to turn the flash on or off
 *
 * RETURN     : 0  -- success
 *              none-zero failure code
 *==========================================================================*/
int QCamera2Factory::set_torch_mode(const char* camera_id, bool on)
{
    return gQCamera2Factory->setTorchMode(camera_id, on);
}

/*===========================================================================
 * FUNCTION   : getNumberOfCameras
 *
 * DESCRIPTION: query number of cameras detected
 *
 * PARAMETERS : none
 *
 * RETURN     : number of cameras detected
 *==========================================================================*/
int QCamera2Factory::getNumberOfCameras()
{
    return mNumOfCameras;
}

/*===========================================================================
 * FUNCTION   : getCameraInfo
 *
 * DESCRIPTION: query camera information with its ID
 *
 * PARAMETERS :
 *   @camera_id : camera ID
 *   @info      : ptr to camera info struct
 *
 * RETURN     : int32_t type of status
 *              NO_ERROR  -- success
 *              none-zero failure code
 *==========================================================================*/
int QCamera2Factory::getCameraInfo(int camera_id, struct camera_info *info)
{
    int rc;
    ALOGV("%s: E, camera_id = %d", __func__, camera_id);

    if (!mNumOfCameras || camera_id >= mNumOfCameras || !info ||
        (camera_id < 0)) {
        return -ENODEV;
    }

    if ( NULL == mHalDescriptors ) {
        ALOGE("%s : Hal descriptor table is not initialized!", __func__);
        return NO_INIT;
    }

    if ( mHalDescriptors[camera_id].device_version == CAMERA_DEVICE_API_VERSION_3_0 ) {
        rc = QCamera3HardwareInterface::getCamInfo(mHalDescriptors[camera_id].cameraId, info);
    } else if (mHalDescriptors[camera_id].device_version == CAMERA_DEVICE_API_VERSION_1_0) {
        rc = QCamera2HardwareInterface::getCapabilities(mHalDescriptors[camera_id].cameraId, info);
    } else {
        ALOGE("%s: Device version for camera id %d invalid %d",
              __func__,
              camera_id,
              mHalDescriptors[camera_id].device_version);
        return BAD_VALUE;
    }

    ALOGV("%s: X", __func__);
    return rc;
}

/*===========================================================================
 * FUNCTION   : setCallbacks
 *
 * DESCRIPTION: set callback functions to send asynchronous notifications to
 *              frameworks.
 *
 * PARAMETERS :
 *   @callbacks : callback function pointer
 *
 * RETURN     :
 *              NO_ERROR  -- success
 *              none-zero failure code
 *==========================================================================*/
int QCamera2Factory::setCallbacks(const camera_module_callbacks_t *callbacks)
{
    int rc = NO_ERROR;
    mCallbacks = callbacks;

    rc = QCameraFlash::getInstance().registerCallbacks(callbacks);
    if (rc != 0) {
        ALOGE("%s : Failed to register callbacks with flash module!", __func__);
    }

    return rc;
}

/*===========================================================================
 * FUNCTION   : cameraDeviceOpen
 *
 * DESCRIPTION: open a camera device with its ID
 *
 * PARAMETERS :
 *   @camera_id : camera ID
 *   @hw_device : ptr to struct storing camera hardware device info
 *
 * RETURN     : int32_t type of status
 *              NO_ERROR  -- success
 *              none-zero failure code
 *==========================================================================*/
int QCamera2Factory::cameraDeviceOpen(int camera_id,
                    struct hw_device_t **hw_device)
{
    int rc = NO_ERROR;
    if (camera_id < 0 || camera_id >= mNumOfCameras)
        return -ENODEV;

    if ( NULL == mHalDescriptors ) {
        ALOGE("%s : Hal descriptor table is not initialized!", __func__);
        return NO_INIT;
    }

    if ( mHalDescriptors[camera_id].device_version == CAMERA_DEVICE_API_VERSION_3_0 ) {
        QCamera3HardwareInterface *hw = new QCamera3HardwareInterface(mHalDescriptors[camera_id].cameraId,
                mCallbacks);
        if (!hw) {
            ALOGE("Allocation of hardware interface failed");
            return NO_MEMORY;
        }
        rc = hw->openCamera(hw_device);
        if (rc != 0) {
            delete hw;
        }
    } else if (mHalDescriptors[camera_id].device_version == CAMERA_DEVICE_API_VERSION_1_0) {
        QCamera2HardwareInterface *hw = new QCamera2HardwareInterface(camera_id);
        if (!hw) {
            ALOGE("Allocation of hardware interface failed");
            return NO_MEMORY;
        }
        rc = hw->openCamera(hw_device);
        if (rc != NO_ERROR) {
            delete hw;
        }
    } else {
        ALOGE("%s: Device version for camera id %d invalid %d",
              __func__,
              camera_id,
              mHalDescriptors[camera_id].device_version);
        return BAD_VALUE;
    }

    return rc;
}

/*===========================================================================
 * FUNCTION   : camera_device_open
 *
 * DESCRIPTION: static function to open a camera device by its ID
 *
 * PARAMETERS :
 *   @camera_id : camera ID
 *   @hw_device : ptr to struct storing camera hardware device info
 *
 * RETURN     : int32_t type of status
 *              NO_ERROR  -- success
 *              none-zero failure code
 *==========================================================================*/
int QCamera2Factory::camera_device_open(
    const struct hw_module_t *module, const char *id,
    struct hw_device_t **hw_device)
{
    if (module != &HAL_MODULE_INFO_SYM.common) {
        ALOGE("Invalid module. Trying to open %p, expect %p",
            module, &HAL_MODULE_INFO_SYM.common);
        return INVALID_OPERATION;
    }
    if (!id) {
        ALOGE("Invalid camera id");
        return BAD_VALUE;
    }
    return gQCamera2Factory->cameraDeviceOpen(atoi(id), hw_device);
}

struct hw_module_methods_t QCamera2Factory::mModuleMethods = {
    open: QCamera2Factory::camera_device_open,
};

/*===========================================================================
 * FUNCTION   : setTorchMode
 *
 * DESCRIPTION: Attempt to turn on or off the torch mode of the flash unit.
 *
 * PARAMETERS :
 *   @camera_id : camera ID
 *   @on        : Indicates whether to turn the flash on or off
 *
 * RETURN     : 0  -- success
 *              none-zero failure code
 *==========================================================================*/
int QCamera2Factory::setTorchMode(const char* camera_id, bool on)
{
    int retVal(0);
    long cameraIdLong(-1);
    int cameraIdInt(-1);
    char* endPointer = NULL;
    errno = 0;
    QCameraFlash& flash = QCameraFlash::getInstance();

    cameraIdLong = strtol(camera_id, &endPointer, 10);

    if ((errno == ERANGE) ||
            (cameraIdLong < 0) ||
            (cameraIdLong >= static_cast<long>(get_number_of_cameras())) ||
            (endPointer == camera_id) ||
            (*endPointer != '\0')) {
        retVal = -EINVAL;
    } else if (on) {
        cameraIdInt = static_cast<int>(cameraIdLong);
        retVal = flash.initFlash(cameraIdInt);

        if (retVal == 0) {
            retVal = flash.setFlashMode(cameraIdInt, on);
            if ((retVal == 0) && (mCallbacks != NULL)) {
                mCallbacks->torch_mode_status_change(mCallbacks,
                        camera_id,
                        TORCH_MODE_STATUS_AVAILABLE_ON);
            } else if (retVal == -EALREADY) {
                // Flash is already on, so treat this as a success.
                retVal = 0;
            }
        }
    } else {
        cameraIdInt = static_cast<int>(cameraIdLong);
        retVal = flash.setFlashMode(cameraIdInt, on);

        if (retVal == 0) {
            retVal = flash.deinitFlash(cameraIdInt);
            if ((retVal == 0) && (mCallbacks != NULL)) {
                mCallbacks->torch_mode_status_change(mCallbacks,
                        camera_id,
                        TORCH_MODE_STATUS_AVAILABLE_OFF);
            }
        } else if (retVal == -EALREADY) {
            // Flash is already off, so treat this as a success.
            retVal = 0;
        }
    }

    return retVal;
}

}; // namespace qcamera