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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 __BLE_DEVICE__
#define __BLE_DEVICE__

#include "mbed.h"
#include "blecommon.h"
#include "Gap.h"
#include "GattServer.h"
#include "BLEDeviceInstanceBase.h"

/**
 * The base class used to abstract away BLE capable radio transceivers or SOCs,
 * to enable this BLE API to work with any radio transparently.
 */
class BLEDevice
{
public:
    /**
     * Initialize the BLE controller. This should be called before using
     * anything else in the BLE_API.
     */
    ble_error_t init();
    ble_error_t reset(void);

    /* GAP specific APIs */
public:
    /**
     * Set the BTLE MAC address and type.
     * @return
     */
    ble_error_t setAddress(Gap::addr_type_t type, const uint8_t address[6]);

    /**
     * @param[in] advType
     *              The GAP advertising mode to use for this device. Valid
     *              values are defined in AdvertisingType:
     *
     *              \par ADV_NON_CONNECTABLE_UNDIRECTED
     *              All connections to the peripheral device will be refused.
     *
     *              \par ADV_CONNECTABLE_DIRECTED
     *              Only connections from a pre-defined central device will be
     *              accepted.
     *
     *              \par ADV_CONNECTABLE_UNDIRECTED
     *              Any central device can connect to this peripheral.
     *
     *              \par ADV_SCANNABLE_UNDIRECTED
     *              Any central device can connect to this peripheral, and
     *              the secondary Scan Response payload will be included or
     *              available to central devices.
     *
     *              \par
     *              See Bluetooth Core Specification 4.0 (Vol. 3), Part C,
     *              Section 9.3 and Core Specification 4.0 (Vol. 6), Part B,
     *              Section 2.3.1 for further information on GAP connection
     *              modes
     */
    void        setAdvertisingType(GapAdvertisingParams::AdvertisingType);

    /**
     * @param[in] interval
     *              Advertising interval between 0x0020 and 0x4000 in 0.625ms
     *              units (20ms to 10.24s).  If using non-connectable mode
     *              (ADV_NON_CONNECTABLE_UNDIRECTED) this min value is
     *              0x00A0 (100ms). To reduce the likelihood of collisions, the
     *              link layer perturbs this interval by a pseudo-random delay
     *              with a range of 0 ms to 10 ms for each advertising event.
     *
     *              \par
     *              Decreasing this value will allow central devices to detect
     *              your peripheral faster at the expense of more power being
     *              used by the radio due to the higher data transmit rate.
     *
     *              \par
     *              This field must be set to 0 if connectionMode is equal
     *              to ADV_CONNECTABLE_DIRECTED
     *
     *              \par
     *              See Bluetooth Core Specification, Vol 3., Part C,
     *              Appendix A for suggested advertising intervals.
     */
    void        setAdvertisingInterval(uint16_t interval);

    /**
     * @param[in] timeout
     *              Advertising timeout between 0x1 and 0x3FFF (1 and 16383)
     *              in seconds.  Enter 0 to disable the advertising timeout.
     */
    void        setAdvertisingTimeout(uint16_t timeout);

    /**
     * Please refer to the APIs above.
     */
    void        setAdvertisingParams(const GapAdvertisingParams &advParams);

    /**
     * This API is typically used as an internal helper to udpate the transport
     * backend with advertising data before starting to advertise. It may also
     * be explicity used to dynamically reset the accumulated advertising
     * payload and scanResponse; to do this, the application can clear and re-
     * accumulate a new advertising payload (and scanResponse) before using this
     * API.
     */
    ble_error_t setAdvertisingPayload(void);

    /**
     * Reset any advertising payload prepared from prior calls to
     * accumulateAdvertisingPayload().
     */
    void        clearAdvertisingPayload(void);

    /**
     * Accumulate an AD structure in the advertising payload. Please note that
     * the payload is limited to 31 bytes. The SCAN_RESPONSE message may be used
     * as an additional 31 bytes if the advertising payload proves to be too
     * small.
     *
     * @param  flags
     *         The flags to be added. Multiple flags may be specified in
     *         combination.
     */
    ble_error_t accumulateAdvertisingPayload(uint8_t flags);

    /**
     * Accumulate an AD structure in the advertising payload. Please note that
     * the payload is limited to 31 bytes. The SCAN_RESPONSE message may be used
     * as an additional 31 bytes if the advertising payload proves to be too
     * small.
     *
     * @param  app
     *         The appearance of the peripheral.
     */
    ble_error_t accumulateAdvertisingPayload(GapAdvertisingData::Appearance app);

    /**
     * Accumulate an AD structure in the advertising payload. Please note that
     * the payload is limited to 31 bytes. The SCAN_RESPONSE message may be used
     * as an additional 31 bytes if the advertising payload proves to be too
     * small.
     *
     * @param  app
     *         The max transmit power to be used by the controller. This is
     *         only a hint.
     */
    ble_error_t accumulateAdvertisingPayloadTxPower(int8_t power);

    /**
     * Accumulate a variable length byte-stream as an AD structure in the
     * advertising payload. Please note that the payload is limited to 31 bytes.
     * The SCAN_RESPONSE message may be used as an additional 31 bytes if the
     * advertising payload proves to be too small.
     *
     * @param  type The type which describes the variable length data.
     * @param  data data bytes.
     * @param  len  length of data.
     */
    ble_error_t accumulateAdvertisingPayload(GapAdvertisingData::DataType type, const uint8_t *data, uint8_t len);

    /**
     * Accumulate a variable length byte-stream as an AD structure in the
     * scanResponse payload.
     *
     * @param  type The type which describes the variable length data.
     * @param  data data bytes.
     * @param  len  length of data.
     */
    ble_error_t accumulateScanResponse(GapAdvertisingData::DataType type, const uint8_t *data, uint8_t len);

    /**
     * Start advertising (GAP Discoverable, Connectable modes, Broadcast
     * Procedure).
     */
    ble_error_t startAdvertising(void);

    /**
     * Stop advertising (GAP Discoverable, Connectable modes, Broadcast
     * Procedure).
     */
    ble_error_t stopAdvertising(void);

    ble_error_t disconnect(Gap::DisconnectionReason_t reason);

    /* APIs to set GAP callbacks. */
    void onTimeout(Gap::EventCallback_t timeoutCallback);

    void onConnection(Gap::ConnectionEventCallback_t connectionCallback);
    /**
     * Used to setup a callback for GAP disconnection.
     */
    void onDisconnection(Gap::DisconnectionEventCallback_t disconnectionCallback);

    /**
     * Setup a callback for the GATT event DATA_SENT.
     */
    void onDataSent(GattServer::ServerEventCallbackWithCount_t callback);

    /**
     * Setup a callback for when a characteristic has its value updated by a
     * client.
     *
     * @Note: it is possible to chain together multiple onDataWritten callbacks
     * (potentially from different modules of an application) to receive updates
     * to characteristics. Many services, such as DFU and UART add their own
     * onDataWritten callbacks behind the scenes to trap interesting events.
     *
     * @Note: it is also possible to setup a callback into a member function of
     * some object.
     */
    void onDataWritten(void (*callback)(const GattCharacteristicWriteCBParams *eventDataP));
    template <typename T> void onDataWritten(T *objPtr, void (T::*memberPtr)(const GattCharacteristicWriteCBParams *context));

    void onUpdatesEnabled(GattServer::EventCallback_t callback);
    void onUpdatesDisabled(GattServer::EventCallback_t callback);
    void onConfirmationReceived(GattServer::EventCallback_t callback);

    /**
     * Add a service declaration to the local server ATT table. Also add the
     * characteristics contained within.
     */
    ble_error_t addService(GattService &service);

    Gap::GapState_t getGapState(void) const;

    /**
     * @param[in/out]  lengthP
     *     input:  Length in bytes to be read,
     *     output: Total length of attribute value upon successful return.
     */
    ble_error_t readCharacteristicValue(uint16_t handle, uint8_t *const buffer, uint16_t *const lengthP);

    /**
     * @param  localOnly
     *         Only update the characteristic locally regardless of notify/indicate flags in the CCCD.
     */
    ble_error_t updateCharacteristicValue(uint16_t handle, const uint8_t* value, uint16_t size, bool localOnly = false);

    /**
     * Yield control to the BLE stack or to other tasks waiting for events. This
     * is a sleep function which will return when there is an application
     * specific interrupt, but the MCU might wake up several times before
     * returning (to service the stack). This is not always interchangeable with
     * WFE().
     */
    void waitForEvent(void);

    ble_error_t getPreferredConnectionParams(Gap::ConnectionParams_t *params);
    ble_error_t setPreferredConnectionParams(const Gap::ConnectionParams_t *params);
    ble_error_t updateConnectionParams(Gap::Handle_t handle, const Gap::ConnectionParams_t *params);

    /**
     * This call allows the application to get the BLE stack version information.
     *
     * @return  A pointer to a const string representing the version.
     *          Note: The string is owned by the BLE_API.
     */
    const char *getVersion(void);

     /**
      * Set the device name characteristic in the GAP service.
      * @param  deviceName The new value for the device-name. This is a UTF-8 encoded, <b>NULL-terminated</b> string.
      */
     ble_error_t setDeviceName(const uint8_t *deviceName);

     /**
      * Get the value of the device name characteristic in the GAP service.
      * @param[out]    deviceName Pointer to an empty buffer where the UTF-8 *non NULL-
      *                           terminated* string will be placed. Set this
      *                           value to NULL in order to obtain the deviceName-length
      *                           from the 'length' parameter.
      *
      * @param[in/out] lengthP    (on input) Length of the buffer pointed to by deviceName;
      *                           (on output) the complete device name length (without the
      *                           null terminator).
      *
      * @note          If the device name is longer than the size of the supplied buffer,
      *                length will return the complete device name length,
      *                and not the number of bytes actually returned in deviceName.
      *                The application may use this information to retry with a suitable buffer size.
      *
      * Sample use:
      *     uint8_t deviceName[20];
      *     unsigned length = sizeof(deviceName);
      *     ble.getDeviceName(deviceName, &length);
      *     if (length < sizeof(deviceName)) {
      *         deviceName[length] = 0;
      *     }
      *     DEBUG("length: %u, deviceName: %s\r\n", length, deviceName);
      */
     ble_error_t getDeviceName(uint8_t *deviceName, unsigned *lengthP);

     /**
      * Set the appearance characteristic in the GAP service.
      * @param[in]  appearance The new value for the device-appearance.
      */
     ble_error_t setAppearance(uint16_t appearance);

     /**
      * Set the appearance characteristic in the GAP service.
      * @param[out]  appearance The new value for the device-appearance.
      */
     ble_error_t getAppearance(uint16_t *appearanceP);

     /**
      * Set the radio's transmit power.
      * @param[in] txPower Radio transmit power in dBm.
      */
     ble_error_t setTxPower(int8_t txPower);

public:
    BLEDevice() : transport(createBLEDeviceInstance()), advParams(), advPayload(), scanResponse(), needToSetAdvPayload(true) {
        advPayload.clear();
        scanResponse.clear();
    }

private:
    BLEDeviceInstanceBase *const transport; /* the device specific backend */

    GapAdvertisingParams advParams;
    GapAdvertisingData   advPayload;
    GapAdvertisingData   scanResponse;

    /* Accumulation of AD structures in the advertisement payload should
     * eventually result in a call to the target's setAdvertisingData() before
     * the server begins advertising. This flag marks the status of the pending update.*/
    bool                 needToSetAdvPayload;

    /**
     * DEPRECATED
     */
public:
    ble_error_t setAdvertisingData(const GapAdvertisingData &ADStructures, const GapAdvertisingData &scanResponse);
    ble_error_t setAdvertisingData(const GapAdvertisingData &ADStructures);

    ble_error_t startAdvertising(const GapAdvertisingParams &advParams);
};

/* BLEDevice methods. Most of these simply forward the calls to the underlying
 * transport.*/

inline ble_error_t
BLEDevice::reset(void)
{
    return transport->reset();
}

inline ble_error_t
BLEDevice::setAddress(Gap::addr_type_t type, const uint8_t address[6])
{
    return transport->getGap().setAddress(type, address);
}

inline void
BLEDevice::setAdvertisingType(GapAdvertisingParams::AdvertisingType advType)
{
    advParams.setAdvertisingType(advType);
}

inline void
BLEDevice::setAdvertisingInterval(uint16_t interval)
{
    advParams.setInterval(interval);
}

inline void
BLEDevice::setAdvertisingTimeout(uint16_t timeout)
{
    advParams.setTimeout(timeout);
}

inline void
BLEDevice::setAdvertisingParams(const GapAdvertisingParams &newAdvParams)
{
    advParams = newAdvParams;
}

inline void
BLEDevice::clearAdvertisingPayload(void)
{
    needToSetAdvPayload = true;
    advPayload.clear();
}

inline ble_error_t
BLEDevice::accumulateAdvertisingPayload(uint8_t flags)
{
    needToSetAdvPayload = true;
    return advPayload.addFlags(flags);
}

inline ble_error_t
BLEDevice::accumulateAdvertisingPayload(GapAdvertisingData::Appearance app)
{
    needToSetAdvPayload = true;
    return advPayload.addAppearance(app);
}

inline ble_error_t
BLEDevice::accumulateAdvertisingPayloadTxPower(int8_t txPower)
{
    needToSetAdvPayload = true;
    return advPayload.addTxPower(txPower);
}

inline ble_error_t
BLEDevice::accumulateAdvertisingPayload(GapAdvertisingData::DataType type, const uint8_t *data, uint8_t len)
{
    needToSetAdvPayload = true;
    return advPayload.addData(type, data, len);
}

inline ble_error_t
BLEDevice::accumulateScanResponse(GapAdvertisingData::DataType type, const uint8_t *data, uint8_t len)
{
    needToSetAdvPayload = true;
    return scanResponse.addData(type, data, len);
}

inline ble_error_t
BLEDevice::setAdvertisingPayload(void) {
    needToSetAdvPayload = false;
    return transport->getGap().setAdvertisingData(advPayload, scanResponse);
}

inline ble_error_t
BLEDevice::startAdvertising(void)
{
    if (needToSetAdvPayload) {
        ble_error_t rc;
        if ((rc = setAdvertisingPayload()) != BLE_ERROR_NONE) {
            return rc;
        }
    }

    return transport->getGap().startAdvertising(advParams);
}

inline ble_error_t
BLEDevice::stopAdvertising(void)
{
    return transport->getGap().stopAdvertising();
}

inline ble_error_t
BLEDevice::disconnect(Gap::DisconnectionReason_t reason)
{
    return transport->getGap().disconnect(reason);
}

inline void
BLEDevice::onTimeout(Gap::EventCallback_t timeoutCallback)
{
    transport->getGap().setOnTimeout(timeoutCallback);
}

inline void
BLEDevice::onConnection(Gap::ConnectionEventCallback_t connectionCallback)
{
    transport->getGap().setOnConnection(connectionCallback);
}

inline void
BLEDevice::onDisconnection(Gap::DisconnectionEventCallback_t disconnectionCallback)
{
    transport->getGap().setOnDisconnection(disconnectionCallback);
}

inline void
BLEDevice::onDataSent(GattServer::ServerEventCallbackWithCount_t callback)
{
    transport->getGattServer().setOnDataSent(callback);
}

inline void
BLEDevice::onDataWritten(void (*callback)(const GattCharacteristicWriteCBParams *eventDataP)) {
    transport->getGattServer().setOnDataWritten(callback);
}

template <typename T> inline void
BLEDevice::onDataWritten(T *objPtr, void (T::*memberPtr)(const GattCharacteristicWriteCBParams *context)) {
    transport->getGattServer().setOnDataWritten(objPtr, memberPtr);
}


inline void
BLEDevice::onUpdatesEnabled(GattServer::EventCallback_t callback)
{
    transport->getGattServer().setOnUpdatesEnabled(callback);
}

inline void
BLEDevice::onUpdatesDisabled(GattServer::EventCallback_t callback)
{
    transport->getGattServer().setOnUpdatesDisabled(callback);
}

inline void
BLEDevice::onConfirmationReceived(GattServer::EventCallback_t callback)
{
    transport->getGattServer().setOnConfirmationReceived(callback);
}

inline ble_error_t
BLEDevice::addService(GattService &service)
{
    return transport->getGattServer().addService(service);
}

inline Gap::GapState_t
BLEDevice::getGapState(void) const
{
    return transport->getGap().getState();
}

inline ble_error_t BLEDevice::readCharacteristicValue(uint16_t handle, uint8_t *const buffer, uint16_t *const lengthP)
{
    return transport->getGattServer().readValue(handle, buffer, lengthP);
}

inline ble_error_t
BLEDevice::updateCharacteristicValue(uint16_t handle, const uint8_t* value, uint16_t size, bool localOnly)
{
    return transport->getGattServer().updateValue(handle, const_cast<uint8_t *>(value), size, localOnly);
}

inline void
BLEDevice::waitForEvent(void)
{
    transport->waitForEvent();
}

inline ble_error_t
BLEDevice::getPreferredConnectionParams(Gap::ConnectionParams_t *params)
{
    return transport->getGap().getPreferredConnectionParams(params);
}

inline ble_error_t
BLEDevice::setPreferredConnectionParams(const Gap::ConnectionParams_t *params)
{
    return transport->getGap().setPreferredConnectionParams(params);
}

inline ble_error_t
BLEDevice::updateConnectionParams(Gap::Handle_t handle, const Gap::ConnectionParams_t *params) {
    return transport->getGap().updateConnectionParams(handle, params);
}

inline const char *
BLEDevice::getVersion(void)
{
    return transport->getVersion();
}

inline ble_error_t
BLEDevice::setDeviceName(const uint8_t *deviceName)
{
    return transport->getGap().setDeviceName(deviceName);
}

inline ble_error_t
BLEDevice::getDeviceName(uint8_t *deviceName, unsigned *lengthP)
{
    return transport->getGap().getDeviceName(deviceName, lengthP);
}

inline ble_error_t
BLEDevice::setAppearance(uint16_t appearance)
{
    return transport->getGap().setAppearance(appearance);
}

inline ble_error_t
BLEDevice::getAppearance(uint16_t *appearanceP)
{
    return transport->getGap().getAppearance(appearanceP);
}

inline ble_error_t
BLEDevice::setTxPower(int8_t txPower)
{
    return transport->setTxPower(txPower);
}

/*
 * ALL OF THE FOLLOWING METHODS ARE DEPRECATED
 */

inline ble_error_t
BLEDevice::setAdvertisingData(const GapAdvertisingData &ADStructures, const GapAdvertisingData &scanResponse)
{
    needToSetAdvPayload = false;
    return transport->getGap().setAdvertisingData(ADStructures, scanResponse);
}

inline ble_error_t
BLEDevice::setAdvertisingData(const GapAdvertisingData &ADStructures)
{
    GapAdvertisingData scanResponse;

    needToSetAdvPayload = false;
    return transport->getGap().setAdvertisingData(ADStructures, scanResponse);
}

inline ble_error_t
BLEDevice::startAdvertising(const GapAdvertisingParams &_advParams)
{
    return transport->getGap().startAdvertising(_advParams);
}

#endif // ifndef __BLE_DEVICE__