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 *  2. Redistributions in binary form must reproduce the above copyright
 *     notice, this list of conditions and the following disclaimer in the
 *     documentation and/or other materials provided with the distribution.
 *  3. Neither the name of the copyright holder nor the
 *     names of its contributors may be used to endorse or promote products
 *     derived from this software without specific prior written permission.
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 *  THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 *  AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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 */

#ifndef OT_NEXUS_CORE_HPP_
#define OT_NEXUS_CORE_HPP_

#include "common/owning_list.hpp"
#include "instance/instance.hpp"

#include "nexus_alarm.hpp"
#include "nexus_radio.hpp"
#include "nexus_utils.hpp"

namespace ot {
namespace Nexus {

class Node;

class Core
{
public:
    Core(void);
    ~Core(void);

    static Core &Get(void) { return *sCore; }

    Node             &CreateNode(void);
    LinkedList<Node> &GetNodes(void) { return mNodes; }

    TimeMilli GetNow(void) { return mNow; }
    void      AdvanceTime(uint32_t aDuration);

    //- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
    // Used by platform implementation

    void  SetActiveNode(Node *aNode) { mActiveNode = aNode; }
    Node *GetActiveNode(void) { return mActiveNode; }

    void UpdateNextAlarmTime(const Alarm &aAlarm);
    void MarkPendingAction(void) { mPendingAction = true; }

private:
    static constexpr int8_t kDefaultRxRssi = -20;

    enum AckMode : uint8_t
    {
        kNoAck,
        kSendAckNoFramePending,
        kSendAckFramePending,
    };

    void Process(Node &aNode);
    void ProcessRadio(Node &aNode);

    static Core *sCore;

    OwningList<Node> mNodes;
    uint16_t         mCurNodeId;
    bool             mPendingAction;
    TimeMilli        mNow;
    TimeMilli        mNextAlarmTime;
    Node            *mActiveNode;
};

void Log(const char *aFormat, ...);

} // namespace Nexus
} // namespace ot

#endif // OT_NEXUS_CORE_HPP_