#ifndef TASK01_QUEUE_MODEL_H
#define TASK01_QUEUE_MODEL_H

#include <stddef.h>
#include <stdint.h>

typedef struct QueueMessage
{
    uint32_t sequence;
    uint32_t payload;
    uint32_t checksum;
} QueueMessage;

typedef struct QueueEvidence
{
    uint32_t sequence;
    uint32_t event;
    uint32_t tick;
    uint32_t actor;
    uint32_t value;
    uint32_t committed;
} QueueEvidence;

static inline uint32_t fc05_message_checksum( uint32_t sequence,
                                               uint32_t payload )
{
    return 0x51000000U ^ sequence ^ payload;
}

static inline int fc05_message_is_valid( const QueueMessage * message )
{
    return message != NULL &&
           message->checksum ==
               fc05_message_checksum( message->sequence, message->payload );
}

static inline uint32_t fc05_digest( const QueueEvidence * events,
                                     size_t count )
{
    uint32_t hash = 2166136261U;
    size_t index;

    for( index = 0U; index < count; ++index )
    {
        hash = ( hash ^ events[ index ].event ) * 16777619U;
        hash = ( hash ^ events[ index ].actor ) * 16777619U;
        hash = ( hash ^ events[ index ].value ) * 16777619U;
        hash = ( hash ^ events[ index ].committed ) * 16777619U;
    }
    return hash;
}

#endif