/*
 * Copyright (C) 2017-2020 Intel Corporation
 *
 * 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.
 */

#define LOG_TAG "Camera3HAL"

#include "Camera3HAL.h"

#include <memory>

#include "Errors.h"
#include "HALv3Utils.h"
#include "ICamera.h"
#include "Utils.h"

namespace camera3 {

/******************************************************************************
 *  C DEVICE INTERFACE IMPLEMENTATION WRAPPER
 *****************************************************************************/

// Common check before the function call
#define FUNCTION_PREPARED_RETURN \
    if (!dev) return -EINVAL;    \
    Camera3HAL* camera_priv = static_cast<Camera3HAL*>(dev->priv);

static int hal_dev_initialize(const struct camera3_device* dev,
                              const camera3_callback_ops_t* callback_ops) {
    LOG1("@%s", __func__);

    FUNCTION_PREPARED_RETURN

    return camera_priv->initialize(callback_ops);
}

static int hal_dev_configure_streams(const struct camera3_device* dev,
                                     camera3_stream_configuration_t* stream_list) {
    LOG1("@%s", __func__);

    FUNCTION_PREPARED_RETURN

    return camera_priv->configure_streams(stream_list);
}

static const camera_metadata_t* hal_dev_construct_default_request_settings(
    const struct camera3_device* dev, int type) {
    LOG1("@%s", __func__);

    if (!dev) return nullptr;
    Camera3HAL* camera_priv = (Camera3HAL*)(dev->priv);

    return camera_priv->construct_default_request_settings(type);
}

static int hal_dev_process_capture_request(const struct camera3_device* dev,
                                           camera3_capture_request_t* request) {
    LOG1("@%s", __func__);

    FUNCTION_PREPARED_RETURN

    return camera_priv->process_capture_request(request);
}

static void hal_dev_dump(const struct camera3_device* dev, int fd) {
    LOG1("@%s", __func__);

    if (!dev) return;

    Camera3HAL* camera_priv = (Camera3HAL*)(dev->priv);

    camera_priv->dump(fd);
}

static int hal_dev_flush(const struct camera3_device* dev) {
    LOG1("@%s", __func__);

    if (!dev) return -EINVAL;

    Camera3HAL* camera_priv = (Camera3HAL*)(dev->priv);
    return camera_priv->flush();
}

static camera3_device_ops hal_dev_ops = {
    .initialize = hal_dev_initialize,
    .configure_streams = hal_dev_configure_streams,
    .register_stream_buffers = nullptr,
    .construct_default_request_settings = hal_dev_construct_default_request_settings,
    .process_capture_request = hal_dev_process_capture_request,
    .get_metadata_vendor_tag_ops = nullptr,
    .dump = hal_dev_dump,
    .flush = hal_dev_flush,
    .reserved = {0},
};

/******************************************************************************
 *  C++ CLASS IMPLEMENTATION
 *****************************************************************************/
Camera3HAL::Camera3HAL(int cameraId, const hw_module_t* module)
        : mCameraId(cameraId),
          mInitialized(false) {
    LOG1("@%s", __func__);

    mDevice = {};
    mDevice.common.tag = HARDWARE_DEVICE_TAG;
    mDevice.common.version = CAMERA_DEVICE_API_VERSION_3_3;
    mDevice.common.module = const_cast<hw_module_t*>(module);
    // hal_dev_close is kept in the module for symmetry with dev_open
    // it will be set there
    mDevice.common.close = nullptr;
    mDevice.ops = &hal_dev_ops;
    mDevice.priv = this;

    int ret = icamera::camera_device_open(cameraId);
    if (ret != icamera::OK) {
        LOGE("@%s, camera_device_open fails, ret:%d", __func__, ret);
        icamera::camera_device_close(cameraId);

        return;
    }

    mRequestManager = std::unique_ptr<RequestManager>(new RequestManager(cameraId));

    mInitialized = true;
}

Camera3HAL::~Camera3HAL() {
    LOG1("@%s", __func__);

    if (mRequestManager) {
        mRequestManager->flush();
        mRequestManager->deinit();

        mRequestManager.reset();  // mRequestManager must be released before device deinit
    }

    icamera::camera_device_close(mCameraId);
}

/* *********************************************************************
 * Camera3 device  APIs
 * ********************************************************************/
int Camera3HAL::initialize(const camera3_callback_ops_t* callback_ops) {
    LOG1("@%s", __func__);
    CheckError(!mInitialized, -ENODEV, "@%s, mInitialized is false", __func__);
    int status = icamera::OK;

    if (callback_ops == nullptr) return -ENODEV;

    status = mRequestManager->init(callback_ops);
    if (status != icamera::OK) {
        LOGE("Error register callback status = %d", status);
        return -ENODEV;
    }
    return status;
}

int Camera3HAL::configure_streams(camera3_stream_configuration_t* stream_list) {
    LOG1("@%s", __func__);
    CheckError(!mInitialized, -EINVAL, "@%s, mInitialized is false", __func__);
    CheckError(!stream_list, -EINVAL, "@%s, stream_list is nullptr", __func__);

    if (!stream_list->streams || !stream_list->num_streams) {
        LOGE("%s: Bad input! streams list ptr: %p, num %d", __func__, stream_list->streams,
             stream_list->num_streams);
        return -EINVAL;
    }
    int num = stream_list->num_streams;
    LOG2("@%s, stream num:%d", __func__, num);
    while (num--) {
        if (!stream_list->streams[num]) {
            LOGE("%s: Bad input! streams (%d) 's ptr: %p", __func__, num,
                 stream_list->streams[num]);
            return -EINVAL;
        }
    }

    int status = mRequestManager->configureStreams(stream_list);
    return (status == icamera::OK) ? 0 : -EINVAL;
}

const camera_metadata_t* Camera3HAL::construct_default_request_settings(int type) {
    LOG1("@%s, type:%d", __func__, type);
    CheckError(!mInitialized, nullptr, "@%s, mInitialized is false", __func__);

    if (type < CAMERA3_TEMPLATE_PREVIEW || type >= CAMERA3_TEMPLATE_COUNT) return nullptr;

    const camera_metadata_t* meta = nullptr;
    int status = mRequestManager->constructDefaultRequestSettings(type, &meta);
    CheckError(status != icamera::OK, nullptr, "construct default request setting error");

    return meta;
}

int Camera3HAL::process_capture_request(camera3_capture_request_t* request) {
    LOG2("@%s", __func__);
    CheckError(!mInitialized, -EINVAL, "@%s, mInitialized is false", __func__);

    if (request == nullptr) {
        LOGE("%s: request is null!", __func__);
        return -EINVAL;
    } else if (!request->num_output_buffers || request->output_buffers == nullptr) {
        LOGE("%s: num_output_buffers %d, output_buffers %p", __func__, request->num_output_buffers,
             request->output_buffers);
        return -EINVAL;
    } else if (request->output_buffers->stream == nullptr) {
        LOGE("%s: output_buffers->stream is null!", __func__);
        return -EINVAL;
    } else if (request->output_buffers->stream->priv == nullptr) {
        LOGE("%s: output_buffers->stream->priv is null!", __func__);
        return -EINVAL;
    } else if (request->output_buffers->buffer == nullptr ||
               *(request->output_buffers->buffer) == nullptr) {
        LOGE("%s: output buffer is invalid", __func__);
        return -EINVAL;
    }

    int status = mRequestManager->processCaptureRequest(request);
    if (status == icamera::OK) return icamera::OK;

    return (status == icamera::BAD_VALUE) ? -EINVAL : -ENODEV;
}

void Camera3HAL::dump(int fd) {
    LOG1("@%s", __func__);
    CheckError(!mInitialized, VOID_VALUE, "@%s, mInitialized is false", __func__);

    mRequestManager->dump(fd);
}

int Camera3HAL::flush() {
    LOG1("@%s", __func__);
    CheckError(!mInitialized, icamera::UNKNOWN_ERROR, "@%s, mInitialized is false", __func__);

    return mRequestManager->flush();
}

}  // namespace camera3