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/* mbed Microcontroller Library
 * Copyright (c) 2006-2013 ARM Limited
 *
 * 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 __NRF51822_GATT_SERVER_H__
#define __NRF51822_GATT_SERVER_H__

#include <stddef.h>

#include "ble/blecommon.h"
#include "ble.h" /* nordic ble */
#include "ble/Gap.h"
#include "ble/GattServer.h"

class nRF5xGattServer : public GattServer
{
public:
    static nRF5xGattServer &getInstance();

    /* Functions that must be implemented from GattServer */
    virtual ble_error_t addService(GattService &);
    virtual ble_error_t read(GattAttribute::Handle_t attributeHandle, uint8_t buffer[], uint16_t *lengthP);
    virtual ble_error_t read(Gap::Handle_t connectionHandle, GattAttribute::Handle_t attributeHandle, uint8_t buffer[], uint16_t *lengthP);
    virtual ble_error_t write(GattAttribute::Handle_t, const uint8_t[], uint16_t, bool localOnly = false);
    virtual ble_error_t write(Gap::Handle_t connectionHandle, GattAttribute::Handle_t, const uint8_t[], uint16_t, bool localOnly = false);
    virtual ble_error_t areUpdatesEnabled(const GattCharacteristic &characteristic, bool *enabledP);
    virtual ble_error_t areUpdatesEnabled(Gap::Handle_t connectionHandle, const GattCharacteristic &characteristic, bool *enabledP);

    /* nRF51 Functions */
    void eventCallback(void);
    void hwCallback(ble_evt_t *p_ble_evt);

private:
    const static unsigned BLE_TOTAL_CHARACTERISTICS = 20;
    const static unsigned BLE_TOTAL_DESCRIPTORS     = 8;

private:
    /**
     * resolve a value attribute to its owning characteristic.
     * @param  valueHandle the value handle to be resolved.
     * @return             characteristic index if a resolution is found, else -1.
     */
    int resolveValueHandleToCharIndex(GattAttribute::Handle_t valueHandle) const {
        unsigned charIndex;
        for (charIndex = 0; charIndex < characteristicCount; charIndex++) {
            if (nrfCharacteristicHandles[charIndex].value_handle == valueHandle) {
                return charIndex;
            }
        }

        return -1;
    }

    /**
     * resolve a CCCD attribute handle to its owning characteristic.
     * @param  cccdHandle the CCCD handle to be resolved.
     * @return             characteristic index if a resolution is found, else -1.
     */
    int resolveCCCDHandleToCharIndex(GattAttribute::Handle_t cccdHandle) const {
        unsigned charIndex;
        for (charIndex = 0; charIndex < characteristicCount; charIndex++) {
            if (nrfCharacteristicHandles[charIndex].cccd_handle == cccdHandle) {
                return charIndex;
            }
        }

        return -1;
    }

private:
    GattCharacteristic       *p_characteristics[BLE_TOTAL_CHARACTERISTICS];
    ble_gatts_char_handles_t  nrfCharacteristicHandles[BLE_TOTAL_CHARACTERISTICS];
    GattAttribute            *p_descriptors[BLE_TOTAL_DESCRIPTORS];
    uint8_t                   descriptorCount;
    uint16_t                  nrfDescriptorHandles[BLE_TOTAL_DESCRIPTORS];

    nRF5xGattServer() : GattServer(), p_characteristics(), nrfCharacteristicHandles(), p_descriptors(), descriptorCount(0), nrfDescriptorHandles() {
        /* empty */
    }

private:
    nRF5xGattServer(const nRF5xGattServer &);
    const nRF5xGattServer& operator=(const nRF5xGattServer &);
};

#endif // ifndef __NRF51822_GATT_SERVER_H__