More skill handlers

Note: need to revisit these when active powers are implemented to make
sure they are correct. DamageNDebuff isn't even implemented yet.

src/Abilities.cpp

@@ -12,31 +12,127 @@ using namespace Abilities;
 std::map<int32_t, SkillData> Abilities::SkillTable;
 
 #pragma region Skill handlers
-static SkillResult handleSkillBuff(SkillData* skill, ICombatant* target) {
-    // the buff skill is special in that its application is not aligned
-    // with the SKILL_USE_SUCC packet, since buffs are calculated every tick.
-    // thus, no game state changes should happen here.
-    sSkillResult_Buff result{};
-    result.iConditionBitFlag = target->getCompositeCondition();
-    result.iID = target->getID();
-    result.bProtected = 0;
+static SkillResult handleSkillDamage(SkillData* skill, int power, ICombatant* source, ICombatant* target) {
+    EntityRef sourceRef = source->getRef();
+    double scalingFactor = 1;
+    if(sourceRef.kind == EntityKind::PLAYER)
+        scalingFactor = std::max(source->getMaxHP(), target->getMaxHP()) / 1000.0;
+    else
+        scalingFactor = source->getMaxHP() / 1500.0;
+
+    int damage = (int)(skill->values[0][power] * scalingFactor);
+    int dealt = target->takeDamage(sourceRef, damage);
+
+    sSkillResult_Damage result{};
     result.eCT = target->getCharType();
+    result.iID = target->getID();
+    result.bProtected = dealt <= 0;
+    result.iDamage = dealt;
+    result.iHP = target->getCurrentHP();
+    return SkillResult(sizeof(sSkillResult_Damage), &result);
+}
+
+static SkillResult handleSkillHealHP(SkillData* skill, int power, ICombatant* source, ICombatant* target) {
+    EntityRef sourceRef = source->getRef();
+    int heal = skill->values[0][power];
+    int healed = target->heal(sourceRef, heal);
+
+    sSkillResult_Heal_HP result{};
+    result.eCT = target->getCharType();
+    result.iID = target->getID();
+    result.iHealHP = heal;
+    result.iHP = target->getCurrentHP();
+    return SkillResult(sizeof(sSkillResult_Heal_HP), &result);
+}
+
+static SkillResult handleSkillDamageNDebuff(SkillData* skill, int power, ICombatant* source, ICombatant* target) {
+    // TODO abilities
+    sSkillResult_Damage_N_Debuff result{};
+    result.eCT = target->getCharType();
+    result.iID = target->getID();
+    result.bProtected = false;
+    result.iConditionBitFlag = target->getCompositeCondition();
+    return SkillResult(sizeof(sSkillResult_Damage_N_Debuff), &result);
+}
+
+static SkillResult handleSkillBuff(SkillData* skill, int power, ICombatant* source, ICombatant* target) {
+    sSkillResult_Buff result{};
+    result.eCT = target->getCharType();
+    result.iID = target->getID();
+    result.bProtected = false;
+    result.iConditionBitFlag = target->getCompositeCondition();
     return SkillResult(sizeof(sSkillResult_Buff), &result);
 }
+
+static SkillResult handleSkillBatteryDrain(SkillData* skill, int power, ICombatant* source, ICombatant* target) {
+    if(target->getCharType() != 1)
+        return SkillResult(); // only Players are valid targets for battery drain
+    Player* plr = dynamic_cast<Player*>(target);
+
+    const double scalingFactor = (18 + source->getLevel()) / 36.0;
+
+    int boostDrain = (int)(skill->values[0][power] * scalingFactor);
+    if(boostDrain > plr->batteryW) boostDrain = plr->batteryW;
+    plr->batteryW -= boostDrain;
+
+    int potionDrain = (int)(skill->values[1][power] * scalingFactor);
+    if(potionDrain > plr->batteryN) potionDrain = plr->batteryN;
+    plr->batteryN -= potionDrain;
+
+    sSkillResult_BatteryDrain result{};
+    result.eCT = target->getCharType();
+    result.iID = target->getID();
+    result.bProtected = target->hasBuff(ECSB_PROTECT_BATTERY);
+    result.iDrainW = boostDrain;
+    result.iBatteryW = plr->batteryW;
+    result.iDrainN = potionDrain;
+    result.iBatteryN = plr->batteryN;
+    result.iStamina = plr->getActiveNano()->iStamina;
+    result.bNanoDeactive = plr->getActiveNano()->iStamina <= 0;
+    result.iConditionBitFlag = target->getCompositeCondition();
+    return SkillResult(sizeof(sSkillResult_BatteryDrain), &result);
+}
+
+static SkillResult handleSkillMove(SkillData* skill, int power, ICombatant* source, ICombatant* target) {
+    if(source->getCharType() != 1)
+        return SkillResult(); // only Players are valid sources for recall
+    Player* plr = dynamic_cast<Player*>(source);
+
+    sSkillResult_Move result{};
+    result.eCT = target->getCharType();
+    result.iID = target->getID();
+    result.iMapNum = plr->recallInstance;
+    result.iMoveX = plr->recallX;
+    result.iMoveY = plr->recallY;
+    result.iMoveZ = plr->recallZ;
+    return SkillResult(sizeof(sSkillResult_Move), &result);
+}
+
+static SkillResult handleSkillResurrect(SkillData* skill, int power, ICombatant* source, ICombatant* target) {
+    sSkillResult_Resurrect result{};
+    result.eCT = target->getCharType();
+    result.iID = target->getID();
+    result.iRegenHP = target->getCurrentHP();
+    return SkillResult(sizeof(sSkillResult_Resurrect), &result);
+}
 #pragma endregion
 
-void Abilities::broadcastNanoSkill(CNSocket* sock, sNano& nano, std::vector<ICombatant*> affected) {
-    if(SkillTable.count(nano.iSkillID) == 0)
-        return;
-
-    SkillData* skill = &SkillTable[nano.iSkillID];
-    Player* plr = PlayerManager::getPlayer(sock);
-    int count = affected.size();
-
+static std::vector<SkillResult> handleSkill(SkillData* skill, int power, ICombatant* src, std::vector<ICombatant*> targets) {
     size_t resultSize = 0;
-    SkillResult (*skillHandler)(SkillData*, ICombatant*) = nullptr;
+    SkillResult (*skillHandler)(SkillData*, int, ICombatant*, ICombatant*) = nullptr;
+    std::vector<SkillResult> results;
+
     switch(skill->skillType)
     {
+        case EST_DAMAGE:
+            resultSize = sizeof(sSkillResult_Damage);
+            skillHandler = handleSkillDamage;
+            break;
+        case EST_HEAL_HP:
+        case EST_RETURNHOMEHEAL:
+            resultSize = sizeof(sSkillResult_Heal_HP);
+            skillHandler = handleSkillHealHP;
+            break;
         case EST_JUMP:
         case EST_RUN:
         case EST_FREEDOM:
@@ -54,28 +150,54 @@ void Abilities::broadcastNanoSkill(CNSocket* sock, sNano& nano, std::vector<ICom
             resultSize = sizeof(sSkillResult_Buff);
             skillHandler = handleSkillBuff;
             break;
+        case EST_BATTERYDRAIN:
+            resultSize = sizeof(sSkillResult_BatteryDrain);
+            skillHandler = handleSkillBatteryDrain;
+            break;
+        case EST_RECALL:
+        case EST_RECALL_GROUP:
+            resultSize = sizeof(sSkillResult_Move);
+            skillHandler = handleSkillMove;
+            break;
+        case EST_PHOENIX_GROUP:
+            resultSize = sizeof(sSkillResult_Resurrect);
+            skillHandler = handleSkillResurrect;
+            break;
         default:
             std::cout << "[WARN] Unhandled skill type " << skill->skillType << std::endl;
-            return;
+            return results;
     }
+    assert(skillHandler != nullptr);
 
-    std::vector<SkillResult> results;
-    for(ICombatant* target : affected) {
-        SkillResult result = handleSkillBuff(skill, target);
+    for(ICombatant* target : targets) {
+        SkillResult result = skillHandler(skill, power, src, target);
+        if(result.size == 0) continue; // skill not applicable
         if(result.size != resultSize) {
-            std::cout << "[WARN] bad skill result size for " << skill->skillType << " from " << handleSkillBuff << std::endl;
-            return;
+            std::cout << "[WARN] bad skill result size for " << skill->skillType << " from " << (void*)handleSkillBuff << std::endl;
+            continue;
         }
         results.push_back(result);
     }
+    return results;
+}
 
-    if (!validOutVarPacket(sizeof(sP_FE2CL_NANO_SKILL_USE_SUCC), count, resultSize)) {
+void Abilities::broadcastNanoSkill(CNSocket* sock, sNano& nano, std::vector<ICombatant*> affected) {
+    if(SkillTable.count(nano.iSkillID) == 0)
+        return;
+
+    SkillData* skill = &SkillTable[nano.iSkillID];
+    Player* plr = PlayerManager::getPlayer(sock);
+
+    std::vector<SkillResult> results = handleSkill(skill, Nanos::getNanoBoost(plr), plr, affected);
+    size_t resultSize = results.back().size; // guaranteed to be the same for every item
+
+    if (!validOutVarPacket(sizeof(sP_FE2CL_NANO_SKILL_USE_SUCC), results.size(), resultSize)) {
         std::cout << "[WARN] bad sP_FE2CL_NANO_SKILL_USE_SUCC packet size\n";
         return;
     }
 
     // initialize response struct
-    size_t resplen = sizeof(sP_FE2CL_NANO_SKILL_USE_SUCC) + count * resultSize;
+    size_t resplen = sizeof(sP_FE2CL_NANO_SKILL_USE_SUCC) + results.size() * resultSize;
     uint8_t respbuf[CN_PACKET_BUFFER_SIZE];
     memset(respbuf, 0, resplen);
 
@@ -86,9 +208,9 @@ void Abilities::broadcastNanoSkill(CNSocket* sock, sNano& nano, std::vector<ICom
     pkt->iNanoStamina = nano.iStamina;
     pkt->bNanoDeactive = nano.iStamina <= 0;
     pkt->eST = skill->skillType;
-    pkt->iTargetCnt = count;
+    pkt->iTargetCnt = (int32_t)results.size();
 
-    char* appended = (char*)(pkt + 1);
+    uint8_t* appended = (uint8_t*)(pkt + 1);
     for(SkillResult& result : results) {
         memcpy(appended, result.payload, resultSize);
         appended += resultSize;

src/Abilities.hpp

@@ -32,11 +32,14 @@ enum class SkillDrainType {
 
 struct SkillResult {
     size_t size;
-    char payload[MAX_SKILLRESULT_SIZE];
+    uint8_t payload[MAX_SKILLRESULT_SIZE];
     SkillResult(size_t len, void* dat) {
         size = len;
         memcpy(payload, dat, len);
     }
+    SkillResult() {
+        size = 0;
+    }
 };
 
 struct SkillData {

src/Combat.cpp

@@ -63,12 +63,19 @@ int Player::getCompositeCondition() {
 }
 
 int Player::takeDamage(EntityRef src, int amt) {
-    HP -= amt;
-    return amt;
+    int dmg = amt;
+    if(HP - dmg < 0) dmg = HP;
+    HP -= dmg;
+
+    return dmg;
 }
 
-void Player::heal(EntityRef src, int amt) {
-    // stubbed
+int Player::heal(EntityRef src, int amt) {
+    int heal = amt;
+    if(HP + heal > getMaxHP()) heal = getMaxHP() - HP;
+    HP += heal;
+
+    return heal;
 }
 
 bool Player::isAlive() {
@@ -79,6 +86,14 @@ int Player::getCurrentHP() {
     return HP;
 }
 
+int Player::getMaxHP() {
+    return PC_MAXHEALTH(level);
+}
+
+int Player::getLevel() {
+    return level;
+}
+
 std::vector<EntityRef> Player::getGroupMembers() {
     std::vector<EntityRef> members;
     if(group != nullptr)
@@ -96,6 +111,10 @@ int32_t Player::getID() {
     return iID;
 }
 
+EntityRef Player::getRef() {
+    return EntityRef(PlayerManager::getSockFromID(iID));
+}
+
 void Player::step(time_t currTime) {
     // no-op
 }
@@ -121,16 +140,21 @@ int CombatNPC::getCompositeCondition() { /* stubbed */
 }
 
 int CombatNPC::takeDamage(EntityRef src, int amt) {
+    int dmg = amt;
+    if(hp - dmg < 0) dmg = hp;
+    hp -= dmg;
 
-    hp -= amt;
-    if (hp <= 0)
-        transition(AIState::DEAD, src);
+    if(hp <= 0) transition(AIState::DEAD, src);
 
-    return amt;
+    return dmg;
 }
 
-void CombatNPC::heal(EntityRef src, int amt) {
-    // stubbed
+int CombatNPC::heal(EntityRef src, int amt) {
+    int heal = amt;
+    if(hp + heal > getMaxHP()) heal = getMaxHP() - hp;
+    hp += heal;
+
+    return heal;
 }
 
 bool CombatNPC::isAlive() {
@@ -141,6 +165,14 @@ int CombatNPC::getCurrentHP() {
     return hp;
 }
 
+int CombatNPC::getMaxHP() {
+    return maxHealth;
+}
+
+int CombatNPC::getLevel() {
+    return level;
+}
+
 std::vector<EntityRef> CombatNPC::getGroupMembers() {
     std::vector<EntityRef> members;
     if(group != nullptr)
@@ -160,6 +192,10 @@ int32_t CombatNPC::getID() {
     return id;
 }
 
+EntityRef CombatNPC::getRef() {
+    return EntityRef(id);
+}
+
 void CombatNPC::step(time_t currTime) {
     
     if(stateHandlers.find(state) != stateHandlers.end())

src/Entities.cpp

@@ -83,6 +83,10 @@ void Egg::enterIntoViewOf(CNSocket *sock) {
     sock->sendPacket(pkt, P_FE2CL_SHINY_ENTER);
 }
 
+sNano* Player::getActiveNano() {
+    return &Nanos[activeNano];
+}
+
 sPCAppearanceData Player::getAppearanceData() {
     sPCAppearanceData data = {};
     data.iID = iID;

src/Entities.hpp

@@ -53,12 +53,15 @@ public:
     virtual bool hasBuff(int) = 0;
     virtual int getCompositeCondition() = 0;
     virtual int takeDamage(EntityRef, int) = 0;
-    virtual void heal(EntityRef, int) = 0;
+    virtual int heal(EntityRef, int) = 0;
     virtual bool isAlive() = 0;
     virtual int getCurrentHP() = 0;
+    virtual int getMaxHP() = 0;
+    virtual int getLevel() = 0;
     virtual std::vector<EntityRef> getGroupMembers() = 0;
     virtual int32_t getCharType() = 0;
     virtual int32_t getID() = 0;
+    virtual EntityRef getRef() = 0;
     virtual void step(time_t currTime) = 0;
 };
 
@@ -124,12 +127,15 @@ struct CombatNPC : public BaseNPC, public ICombatant {
     virtual bool hasBuff(int buffId) override;
     virtual int getCompositeCondition() override;
     virtual int takeDamage(EntityRef src, int amt) override;
-    virtual void heal(EntityRef src, int amt) override;
+    virtual int heal(EntityRef src, int amt) override;
     virtual bool isAlive() override;
     virtual int getCurrentHP() override;
+    virtual int getMaxHP() override;
+    virtual int getLevel() override;
     virtual std::vector<EntityRef> getGroupMembers() override;
     virtual int32_t getCharType() override;
     virtual int32_t getID() override;
+    virtual EntityRef getRef() override;
     virtual void step(time_t currTime) override;
 
     virtual void transition(AIState newState, EntityRef src);

src/Player.hpp

@@ -95,14 +95,18 @@ struct Player : public Entity, public ICombatant {
     virtual bool hasBuff(int buffId) override;
     virtual int getCompositeCondition() override;
     virtual int takeDamage(EntityRef src, int amt) override;
-    virtual void heal(EntityRef src, int amt) override;
+    virtual int heal(EntityRef src, int amt) override;
     virtual bool isAlive() override;
     virtual int getCurrentHP() override;
+    virtual int getMaxHP() override;
+    virtual int getLevel() override;
     virtual std::vector<EntityRef> getGroupMembers() override;
     virtual int32_t getCharType() override;
     virtual int32_t getID() override;
+    virtual EntityRef getRef() override;
 
     virtual void step(time_t currTime) override;
 
+    sNano* getActiveNano();
     sPCAppearanceData getAppearanceData();
 };

src/core/CNProtocol.hpp

@@ -93,7 +93,7 @@ inline constexpr bool isOutboundPacketID(uint32_t id) {
 
 // overflow-safe validation of variable-length packets
 // for outbound packets
-inline constexpr bool validOutVarPacket(size_t base, int32_t npayloads, size_t plsize) {
+inline constexpr bool validOutVarPacket(size_t base, size_t npayloads, size_t plsize) {
     // check for multiplication overflow
     if (npayloads > 0 && (CN_PACKET_BUFFER_SIZE - 8) / (size_t)npayloads < plsize)
         return false;
@@ -110,7 +110,7 @@ inline constexpr bool validOutVarPacket(size_t base, int32_t npayloads, size_t p
 }
 
 // for inbound packets
-inline constexpr bool validInVarPacket(size_t base, int32_t npayloads, size_t plsize, size_t datasize) {
+inline constexpr bool validInVarPacket(size_t base, size_t npayloads, size_t plsize, size_t datasize) {
     // check for multiplication overflow
     if (npayloads > 0 && (CN_PACKET_BUFFER_SIZE - 8) / (size_t)npayloads < plsize)
         return false;