vcmi/lib/spells/effects/DemonSummon.cpp

/*
 * DemonSummon.cpp, part of VCMI engine
 *
 * Authors: listed in file AUTHORS in main folder
 *
 * License: GNU General Public License v2.0 or later
 * Full text of license available in license.txt file, in main folder
 *
 */
#include "StdInc.h"

#include "DemonSummon.h"
#include "Registry.h"
#include "../ISpellMechanics.h"
#include "../../NetPacks.h"
#include "../../battle/CBattleInfoCallback.h"
#include "../../battle/CUnitState.h"
#include "../../serializer/JsonSerializeFormat.h"

VCMI_LIB_NAMESPACE_BEGIN

static const std::string EFFECT_NAME = "core:demonSummon";

namespace spells
{
namespace effects
{

VCMI_REGISTER_SPELL_EFFECT(DemonSummon, EFFECT_NAME);

DemonSummon::DemonSummon()
	: UnitEffect()
	, creature(0)
	, permanent(false)
{
}

DemonSummon::~DemonSummon() = default;

void DemonSummon::apply(ServerCallback * server, const Mechanics * m, const EffectTarget & target) const
{
	BattleUnitsChanged pack;

	for(const Destination & dest : target)
	{
		const battle::Unit * targetStack = dest.unitValue;

		//we shall have all targets to be stacks
		if(!targetStack || targetStack->alive() || targetStack->isGhost())
		{
			server->complain("No corpse to demonize! Invalid effect target transformation.");
			continue;
		}

		auto hex = m->battle()->getAvaliableHex(targetStack->creatureId(), m->casterSide, targetStack->getPosition());

		if(!hex.isValid())
		{
			server->complain("No place to put new summon!");
			break;
		}

		auto creatureType = creature.toCreature(m->creatures());

		int32_t deadCount         = targetStack->unitBaseAmount();
		int32_t deadTotalHealth   = targetStack->getTotalHealth();
		int32_t raisedMaxHealth   = creatureType->getMaxHealth();
		int32_t raisedTotalHealth = m->applySpellBonus(m->getEffectValue(), targetStack);

		// Can't raise stack with more HP than original stack
		int32_t maxAmountFromHealth     = deadTotalHealth / raisedMaxHealth;
		// Can't raise stack with more creatures than original stack
		int32_t maxAmountFromAmount     = deadCount;
		// Can't raise stack with more HP than our spellpower
		int32_t maxAmountFromSpellpower = raisedTotalHealth / raisedMaxHealth;

		int32_t finalAmount = std::min( { maxAmountFromHealth, maxAmountFromAmount, maxAmountFromSpellpower } );

		if(finalAmount < 1)
		{
			server->complain("Summoning didn't summon any!");
			continue;
		}

		battle::UnitInfo info;
		info.id       = m->battle()->battleNextUnitId();
		info.count    = finalAmount;
		info.type     = creature;
		info.side     = m->casterSide;
		info.position = dest.hexValue;
		info.summoned = !permanent;

		// add newly created creature
		pack.changedStacks.emplace_back(info.id, UnitChanges::EOperation::ADD);
		info.save(pack.changedStacks.back().data);

		// and remove corpse to prevent second raising or resurrection
		pack.changedStacks.emplace_back(targetStack->unitId(), UnitChanges::EOperation::REMOVE);
	}

	if(!pack.changedStacks.empty())
		server->apply(&pack);
}

bool DemonSummon::isValidTarget(const Mechanics * m, const battle::Unit * s) const
{
	if(!s->isDead())
		return false;

	if (s->isGhost())
		return false;

	auto creatureType = creature.toCreature(m->creatures());

	if (s->getTotalHealth() < creatureType->getMaxHealth())
		return false;

	return m->isReceptive(s);
}

void DemonSummon::serializeJsonUnitEffect(JsonSerializeFormat & handler)
{
	handler.serializeId("id", creature, CreatureID());
	handler.serializeBool("permanent", permanent, false);
}

}
}

VCMI_LIB_NAMESPACE_END