#include "obse/GameExtraData.h"
#include "obse/GameAPI.h"

bool BaseExtraList::HasType(UInt32 type) const
{
	UInt32 index = (type >> 3);
	UInt8 bitMask = 1 << (type % 8);
	return (m_presenceBitfield[index] & bitMask) != 0;
}

BSExtraData * BaseExtraList::GetByType(UInt32 type) const
{
	if (!HasType(type)) return NULL;

	for(BSExtraData * traverse = m_data; traverse; traverse = traverse->next)
		if(traverse->type == type)
			return traverse;

	Console_Print("ExtraData HasType(%d) is true but it wasn't found!", type);
	return NULL;
}

void BaseExtraList::MarkType(UInt32 type, bool bCleared)
{
	UInt32 index = (type >> 3);
	UInt8 bitMask = 1 << (type % 8);
	UInt8& flag = m_presenceBitfield[index];
	if (bCleared) {
		flag &= ~bitMask;
	} else {
		flag |= bitMask;
	}
}

bool BaseExtraList::Remove(BSExtraData* toRemove)
{
	if (!toRemove) return false;

	if (HasType(toRemove->type)) {
		bool bRemoved = false;
		if (m_data == toRemove) {
			m_data = m_data->next;
			bRemoved = true;
		}

		for (BSExtraData* traverse = m_data; traverse; traverse = traverse->next) {
			if (traverse->next == toRemove) {
				traverse->next = toRemove->next;
				bRemoved = true;
				break;
			}
		}
		if (bRemoved) {
			MarkType(toRemove->type, true);
		}
		return true;
	}

	return false;
}

bool BaseExtraList::Add(BSExtraData* toAdd)
{
	if (!toAdd || HasType(toAdd->type)) return false;
	
	BSExtraData* next = m_data;
	m_data = toAdd;
	toAdd->next = next;
	MarkType(toAdd->type, false);
	return true;
}

ExtraContainerChanges::EntryData * ExtraContainerChanges::GetByType(TESForm * type)
{
	ExtraContainerChanges::EntryData	* result = NULL;

	if(data)
	{
		for(Entry * entry = data->objList; entry; entry = entry->next)
		{
			if(entry->data && (entry->data->type == type))
			{
				result = entry->data;
				break;
			}
		}
	}

	return result;
}

#if OBLIVION_VERSION == OBLIVION_VERSION_1_1

static const UInt32 s_ExtraHealthSize = 0x10;
static const UInt32 s_ExtraHealthVtbl = 0x00A02294;
static const UInt32 s_ExtraChargeSize = 0x10;
static const UInt32 s_ExtraChargeVtbl = 0x00A022B8;
static const UInt32 s_ExtraUsesSize = 0x10;
static const UInt32 s_ExtraUsesVtbl = 0x00A022A0;
static const UInt32 s_ExtraPoisonSize = 0x10;
static const UInt32 s_ExtraPoisonVtbl = 0x00A02420;
static const UInt32 s_ExtraTravelHorseSize = 0x10;
static const UInt32 s_ExtraTravelHorseVtbl = 0x00A023FC;
static const UInt32 s_ExtraLockSize = 0x10;
static const UInt32 s_ExtraLockVtbl = 0x00A02210;

#elif OBLIVION_VERSION == OBLIVION_VERSION_1_2

static const UInt32 s_ExtraHealthSize = 0x10;
static const UInt32 s_ExtraHealthVtbl = 0x00A358B0;
static const UInt32 s_ExtraChargeSize = 0x10;
static const UInt32 s_ExtraChargeVtbl = 0x00A358D4;
static const UInt32 s_ExtraUsesSize = 0x10;
static const UInt32 s_ExtraUsesVtbl = 0x00A358BC;
static const UInt32 s_ExtraPoisonSize = 0x10;
static const UInt32 s_ExtraPoisonVtbl = 0x00A35A48;
static const UInt32 s_ExtraTravelHorseSize = 0x10;
static const UInt32 s_ExtraTravelHorseVtbl = 0x00A35A24;
static const UInt32 s_ExtraLockSize = 0x10;
static const UInt32 s_ExtraLockVtbl = 0x00A35820;

#elif OBLIVION_VERSION == OBLIVION_VERSION_1_2_416

static const UInt32 s_ExtraHealthSize = 0x10;
static const UInt32 s_ExtraHealthVtbl = 0x00A35848;
static const UInt32 s_ExtraChargeSize = 0x10;
static const UInt32 s_ExtraChargeVtbl = 0x00A3586C;
static const UInt32 s_ExtraUsesSize = 0x10;
static const UInt32 s_ExtraUsesVtbl = 0x00A35854;
static const UInt32 s_ExtraPoisonSize = 0x10;
static const UInt32 s_ExtraPoisonVtbl = 0x00A359E0;
static const UInt32 s_ExtraTravelHorseSize = 0x10;
static const UInt32 s_ExtraTravelHorseVtbl = 0x00A359BC;
static const UInt32 s_ExtraLockSize = 0x10;
static const UInt32 s_ExtraLockVtbl = 0x00A357B8;

#else
#error unsupported oblivion version
#endif

// static
BSExtraData* BSExtraData::Create(UInt8 xType, UInt32 size, UInt32 vtbl)
{
	void* memory = FormHeap_Allocate(size);
	memset(memory, 0, size);
	((UInt32*)memory)[0] = vtbl;
	BSExtraData* xData = (BSExtraData*)memory;
	xData->type = xType;
	return xData;
}

// static
ExtraHealth* ExtraHealth::Create()
{
	ExtraHealth* xHealth = (ExtraHealth*)BSExtraData::Create(kExtraData_Health, s_ExtraHealthSize, s_ExtraHealthVtbl);
	return xHealth;
}

// static
ExtraCharge* ExtraCharge::Create()
{
	ExtraCharge* xCharge = (ExtraCharge*)BSExtraData::Create(kExtraData_Charge, s_ExtraChargeSize, s_ExtraChargeVtbl);
	return xCharge;
}

// static
ExtraUses* ExtraUses::Create()
{
	ExtraUses* xUses = (ExtraUses*)BSExtraData::Create(kExtraData_Uses, s_ExtraUsesSize, s_ExtraUsesVtbl);
	return xUses;
}

// static
ExtraPoison* ExtraPoison::Create()
{
	ExtraPoison* xPoison = (ExtraPoison*)BSExtraData::Create(kExtraData_Poison, s_ExtraPoisonSize, s_ExtraPoisonVtbl);
	return xPoison;
}

ExtraTravelHorse* ExtraTravelHorse::Create()
{
	ExtraTravelHorse* xHorse = (ExtraTravelHorse*)BSExtraData::Create(kExtraData_TravelHorse, s_ExtraTravelHorseSize,
																	  s_ExtraTravelHorseVtbl);
	return xHorse;
}

ExtraLock* ExtraLock::Create()
{
	ExtraLock* xLock = (ExtraLock*)BSExtraData::Create(kExtraData_Lock, s_ExtraLockSize, s_ExtraLockVtbl);
	ExtraLock::Data* lockData = (ExtraLock::Data*)FormHeap_Allocate(sizeof(ExtraLock::Data));
	memset(lockData, 0, sizeof(ExtraLock::Data));
	xLock->data = lockData;
	return xLock;
}
