/// <summary>
/// Move any memory or collections of memories that have an influence over the long term memory threshold
/// from short to long term memory. For a collection to be moved the `about` Game Object must be identical
/// and the total influence must be over the threshold level.
/// </summary>
internal void MoveFromShortToLongTermMemory()
{
var grouped = from memory in m_ShortTermMemories
group memory by new
{
memory.about,
memory.statName,
memory
} into grp
select new
{
about = grp.Key.about,
traitName = grp.Key.statName,
totalInfluence = grp.Sum(i => i.influence)
};
foreach (var item in grouped)
{
if (item.totalInfluence >= m_LongTermMemoryThreshold)
{
MemorySO memory = ScriptableObject.CreateInstance <MemorySO>();
memory.about = item.about;
memory.statName = item.traitName;
memory.influence = item.totalInfluence;
AddToLongTermMemory(memory);
ForgetShortTermMemories(item.about);
}
}
}
/// <summary>
/// Add a memory to the short term memory.
/// If there is an existing short term memory that is similar to the new one then do not duplicate;
/// instead strengthen the existing memory.
/// If there is space left in the memory then is simply inserted.
/// If there is no space left then discard the weakest memory.
/// </summary>
/// <param name="memory">The memory to add</param>
public void AddMemory(MemorySO memory)
{
MemorySO existingMemory = GetSimilarShortTermMemory(memory);
if (existingMemory != null)
{
if (existingMemory.isGood != memory.isGood)
{
if (Math.Abs(existingMemory.influence) < Math.Abs(memory.influence))
{
existingMemory.isGood = memory.isGood;
}
}
existingMemory.influence += memory.influence;
existingMemory.m_Time = memory.m_Time;
return;
}
MoveFromShortToLongTermMemory();
if (m_ShortTermMemories.Count == m_ShortTermMemorySize)
{
DiscardShortTermMemory();
}
m_ShortTermMemories.Add(memory);
}
/// <summary>
/// Retrive all memories (long and short term) about influencers of a stat.
/// </summary>
/// <param name="name">The name of the stat we are interested in.</param>
/// <returns>A set of influencers known to affect the desired stat.</returns>
public MemorySO[] GetMemoriesInfluencingStat(string name)
{
MemorySO[] shortTermMemories = m_ShortTermMemories.Where(m => m.statName == name).ToArray <MemorySO>();
MemorySO[] longTermMemories = m_LongTermMemories.Where(m => m.statName == name).ToArray <MemorySO>();
MemorySO[] all = new MemorySO[shortTermMemories.Length + longTermMemories.Length];
shortTermMemories.CopyTo(all, 0);
longTermMemories.CopyTo(all, shortTermMemories.Length);
return(all);
}
/// <summary>
/// Create a memory about an influencer object. See `AddMemory(MemorySO memory)`.
/// </summary>
/// <param name="influencer">The influencer that this memory should record.</param>
/// <param name="isGood">Is this a good memory that represents an experience to be repeated?</param>
internal void AddMemory(StatInfluencerSO influencer, bool isGood)
{
MemorySO memory = ScriptableObject.CreateInstance <MemorySO>();
memory.about = influencer.generator;
memory.statName = influencer.statName;
memory.influence = influencer.maxChange;
memory.cooldown = influencer.cooldown;
memory.isGood = isGood;
AddMemory(memory);
}
/// <summary>
/// Add a memory to the long term memory if there is space. If there is not space then remove the
/// weakest memory that is weaker than the memory being added, or discard the added memory.
/// </summary>
/// <param name="memory">The memory to try to add</param>
/// <returns>True if the memory was committed to long term memory.</returns>
private bool AddToLongTermMemory(MemorySO memory)
{
if (m_LongTermMemories.Count <= m_LongTermMemorySize)
{
m_LongTermMemories.Add(memory);
return(true);
}
else
{
throw new NotImplementedException("Make space in long term memory");
}
}
/// <summary>
/// Get all memories (long and short term), about a Game Object.
/// </summary>
/// <param name="go">The Game Object to retrieve memories about.</param>
/// <returns></returns>
public MemorySO[] GetAllMemoriesAbout(GameObject go)
{
MemorySO[] shortTerm = m_ShortTermMemories.Where(m => ReferenceEquals(go, m.about))
.ToArray();
MemorySO[] longTerm = m_LongTermMemories.Where(m => ReferenceEquals(go, m.about))
.ToArray();
MemorySO[] memories = new MemorySO[longTerm.Length + shortTerm.Length];
longTerm.CopyTo(memories, 0);
shortTerm.CopyTo(memories, longTerm.Length);
return(memories);
}
/// <summary>
/// Scan short term memory to see if there is an existing memory similar to this one.
/// </summary>
/// <param name="memory">The memory we are looking for similarities to</param>
/// <returns>Return an existing short term memory that is similar, if one exists, or null.</returns>
public MemorySO GetSimilarShortTermMemory(MemorySO memory)
{
MemorySO[] memories = GetShortTermMemoriesAbout(memory.about);
if (memories.Length > 0)
{
for (int i = 0; i < memories.Length; i++)
{
if (memories[i].statName == memory.statName)
{
return(memories[i]);
}
}
}
return(null);
}
