(WIP) Start implementing ICombatant

Start by replacing `hitMob` with `takeDamage` interface function.
Simplify `pcAttackChars` a little by utilizing the new interface, then add more interface functions as needed.

A lot of the combat logic is tied to the `Mob` class. Need to start moving stuff over to CombatNPC.

src/Abilities.cpp

@@ -148,7 +148,7 @@ bool doDebuff(CNSocket *sock, sSkillResult_Buff *respdata, int i, int32_t target
     }
 
     Mob* mob = (Mob*)npc;
-    Combat::hitMob(sock, mob, 0);
+    mob->takeDamage(sock, 0);
 
     respdata[i].eCT = 4;
     respdata[i].iID = mob->id;
@@ -220,7 +220,7 @@ bool doDamageNDebuff(CNSocket *sock, sSkillResult_Damage_N_Debuff *respdata, int
 
     Mob* mob = (Mob*)npc;
 
-    Combat::hitMob(sock, mob, 0); // just to gain aggro
+    mob->takeDamage(sock, 0);
 
     respdata[i].eCT = 4;
     respdata[i].iDamage = duration / 10;
@@ -289,7 +289,7 @@ bool doDamage(CNSocket *sock, sSkillResult_Damage *respdata, int i, int32_t targ
     Mob* mob = (Mob*)npc;
     Player *plr = PlayerManager::getPlayer(sock);
 
-    int damage = Combat::hitMob(sock, mob, std::max(PC_MAXHEALTH(plr->level) * amount / 1000, mob->maxHealth * amount / 1000));
+    int damage = mob->takeDamage(sock, std::max(PC_MAXHEALTH(plr->level) * amount / 1000, mob->maxHealth * amount / 1000));
 
     respdata[i].eCT = 4;
     respdata[i].iDamage = damage;
@@ -344,7 +344,7 @@ bool doLeech(CNSocket *sock, sSkillResult_Heal_HP *healdata, int i, int32_t targ
 
     Mob* mob = (Mob*)npc;
 
-    int damage = Combat::hitMob(sock, mob, amount * 2);
+    int damage = mob->takeDamage(sock, amount * 2);
 
     damagedata->eCT = 4;
     damagedata->iDamage = damage;

src/Combat.cpp

@@ -17,8 +17,9 @@ using namespace Combat;
 /// Player Id -> Bullet Id -> Bullet
 std::map<int32_t, std::map<int8_t, Bullet>> Combat::Bullets;
 
-void Player::takeDamage(EntityRef src, int amt) {
+int Player::takeDamage(EntityRef src, int amt) {
-    // stubbed
+    HP -= amt;
+    return amt;
 }
 
 void Player::heal(EntityRef src, int amt) {
@@ -29,8 +30,54 @@ bool Player::isAlive() {
     return HP > 0;
 }
 
-void CombatNPC::takeDamage(EntityRef src, int amt) {
+int Player::getCurrentHP() {
-    // stubbed
+    return HP;
+}
+
+int32_t Player::getID() {
+    return iID;
+}
+
+int CombatNPC::takeDamage(EntityRef src, int amt) {
+
+    /* REFACTOR: all of this logic is strongly coupled to mobs.
+     * come back to this when more of it is moved to CombatNPC.
+     * remove this cast when done */
+    Mob* mob = (Mob*)this;
+
+    // cannot kill mobs multiple times; cannot harm retreating mobs
+    if (mob->state != MobState::ROAMING && mob->state != MobState::COMBAT) {
+        return 0; // no damage
+    }
+
+    if (mob->skillStyle >= 0)
+        return 0; // don't hurt a mob casting corruption
+
+    if (mob->state == MobState::ROAMING) {
+        assert(mob->target == nullptr && src.type == EntityType::PLAYER); // players only for now
+        MobAI::enterCombat(src.sock, mob);
+
+        if (mob->groupLeader != 0)
+            MobAI::followToCombat(mob);
+    }
+
+    hp -= amt;
+
+    // wake up sleeping monster
+    if (mob->cbf & CSB_BIT_MEZ) {
+        mob->cbf &= ~CSB_BIT_MEZ;
+
+        INITSTRUCT(sP_FE2CL_CHAR_TIME_BUFF_TIME_OUT, pkt1);
+        pkt1.eCT = 2;
+        pkt1.iID = mob->id;
+        pkt1.iConditionBitFlag = mob->cbf;
+        NPCManager::sendToViewable(mob, &pkt1, P_FE2CL_CHAR_TIME_BUFF_TIME_OUT, sizeof(sP_FE2CL_CHAR_TIME_BUFF_TIME_OUT));
+    }
+
+    if (mob->hp <= 0)
+        killMob(mob->target, mob);
+
+    return amt;
 }
 
 void CombatNPC::heal(EntityRef src, int amt) {
@@ -41,6 +88,14 @@ bool CombatNPC::isAlive() {
     return hp > 0;
 }
 
+int CombatNPC::getCurrentHP() {
+    return hp;
+}
+
+int32_t CombatNPC::getID() {
+    return id;
+}
+
 static std::pair<int,int> getDamage(int attackPower, int defensePower, bool shouldCrit,
                                          bool batteryBoost, int attackerStyle,
                                          int defenderStyle, int difficulty) {
@@ -152,7 +207,7 @@ static void pcAttackNpcs(CNSocket *sock, CNPacketData *data) {
         else
             plr->batteryW = 0;
 
-        damage.first = hitMob(sock, mob, damage.first);
+        damage.first = mob->takeDamage(sock, damage.first);
 
         respdata[i].iID = mob->id;
         respdata[i].iDamage = damage.first;
@@ -205,42 +260,6 @@ void Combat::npcAttackPc(Mob *mob, time_t currTime) {
     }
 }
 
-int Combat::hitMob(CNSocket *sock, Mob *mob, int damage) {
-    // cannot kill mobs multiple times; cannot harm retreating mobs
-    if (mob->state != MobState::ROAMING && mob->state != MobState::COMBAT) {
-        return 0; // no damage
-    }
-
-    if (mob->skillStyle >= 0)
-        return 0; // don't hurt a mob casting corruption
-
-    if (mob->state == MobState::ROAMING) {
-        assert(mob->target == nullptr);
-        MobAI::enterCombat(sock, mob);
-
-        if (mob->groupLeader != 0)
-            MobAI::followToCombat(mob);
-    }
-
-    mob->hp -= damage;
-
-    // wake up sleeping monster
-    if (mob->cbf & CSB_BIT_MEZ) {
-        mob->cbf &= ~CSB_BIT_MEZ;
-
-        INITSTRUCT(sP_FE2CL_CHAR_TIME_BUFF_TIME_OUT, pkt1);
-        pkt1.eCT = 2;
-        pkt1.iID = mob->id;
-        pkt1.iConditionBitFlag = mob->cbf;
-        NPCManager::sendToViewable(mob, &pkt1, P_FE2CL_CHAR_TIME_BUFF_TIME_OUT, sizeof(sP_FE2CL_CHAR_TIME_BUFF_TIME_OUT));
-    }
-
-    if (mob->hp <= 0)
-        killMob(mob->target, mob);
-
-    return damage;
-}
-
 /*
  * When a group of players is doing missions together, we want them to all get
  * quest items at the same time, but we don't want the odds of quest item
@@ -432,7 +451,7 @@ static void pcAttackChars(CNSocket *sock, CNPacketData *data) {
         return;
 
     // Unlike the attack mob packet, attacking players packet has an 8-byte trail (Instead of 4 bytes).
-    if (!validInVarPacket(sizeof(sP_CL2FE_REQ_PC_ATTACK_CHARs), pkt->iTargetCnt, sizeof(int32_t) * 2, data->size)) {
+    if (!validInVarPacket(sizeof(sP_CL2FE_REQ_PC_ATTACK_CHARs), pkt->iTargetCnt, sizeof(sGM_PVPTarget), data->size)) {
         std::cout << "[WARN] bad sP_CL2FE_REQ_PC_ATTACK_CHARs packet size\n";
         return;
     }
@@ -456,11 +475,20 @@ static void pcAttackChars(CNSocket *sock, CNPacketData *data) {
     resp->iTargetCnt = pkt->iTargetCnt;
 
     for (int i = 0; i < pkt->iTargetCnt; i++) {
-        if (pktdata[i*2+1] == 1) { // eCT == 1; attack player
+
-            Player *target = nullptr;
+        ICombatant* target = nullptr;
+        sGM_PVPTarget* targdata = (sGM_PVPTarget*)(pktdata + i * 2);
+        std::pair<int, int> damage;
+
+        if (pkt->iTargetCnt > 1)
+            damage.first = plr->groupDamage;
+        else
+            damage.first = plr->pointDamage;
+
+        if (targdata->eCT == 1) { // eCT == 1; attack player
 
             for (auto& pair : PlayerManager::players) {
-                if (pair.second->iID == pktdata[i*2]) {
+                if (pair.second->iID == targdata->iID) {
                     target = pair.second;
                     break;
                 }
@@ -472,68 +500,42 @@ static void pcAttackChars(CNSocket *sock, CNPacketData *data) {
                 return;
             }
 
-            std::pair<int,int> damage;
+            damage = getDamage(damage.first, ((Player*)target)->defense, true, (plr->batteryW > 6 + plr->level), -1, -1, 0);
 
-            if (pkt->iTargetCnt > 1)
-                damage.first = plr->groupDamage;
-            else
-                damage.first = plr->pointDamage;
-
-            damage = getDamage(damage.first, target->defense, true, (plr->batteryW > 6 + plr->level), -1, -1, 0);
-
-            if (plr->batteryW >= 6 + plr->level)
-                plr->batteryW -= 6 + plr->level;
-            else
-                plr->batteryW = 0;
-
-            target->HP -= damage.first;
-
-            respdata[i].eCT = pktdata[i*2+1];
-            respdata[i].iID = target->iID;
-            respdata[i].iDamage = damage.first;
-            respdata[i].iHP = target->HP;
-            respdata[i].iHitFlag = damage.second; // hitscan, not a rocket or a grenade
         } else { // eCT == 4; attack mob
-            if (NPCManager::NPCs.find(pktdata[i*2]) == NPCManager::NPCs.end()) {
+
+            if (NPCManager::NPCs.find(targdata->iID) == NPCManager::NPCs.end()) {
                 // not sure how to best handle this
                 std::cout << "[WARN] pcAttackChars: NPC ID not found" << std::endl;
                 return;
             }
 
-            BaseNPC* npc = NPCManager::NPCs[pktdata[i * 2]];
+            BaseNPC* npc = NPCManager::NPCs[targdata->iID];
             if (npc->kind != EntityType::MOB) {
                 std::cout << "[WARN] pcAttackChars: NPC is not a mob" << std::endl;
                 return;
             }
 
             Mob* mob = (Mob*)npc;
-
+            target = mob;
-            std::pair<int,int> damage;
-
-            if (pkt->iTargetCnt > 1)
-                damage.first = plr->groupDamage;
-            else
-                damage.first = plr->pointDamage;
-
             int difficulty = (int)mob->data["m_iNpcLevel"];
-
             damage = getDamage(damage.first, (int)mob->data["m_iProtection"], true, (plr->batteryW > 6 + difficulty),
                 Nanos::nanoStyle(plr->activeNano), (int)mob->data["m_iNpcStyle"], difficulty);
+        }
 
-            if (plr->batteryW >= 6 + difficulty)
+        if (plr->batteryW >= 6 + plr->level)
-                plr->batteryW -= 6 + difficulty;
+            plr->batteryW -= 6 + plr->level;
         else
             plr->batteryW = 0;
 
-            damage.first = hitMob(sock, mob, damage.first);
+        damage.first = target->takeDamage(sock, damage.first);
 
-            respdata[i].eCT = pktdata[i*2+1];
+        respdata[i].eCT = targdata->eCT;
-            respdata[i].iID = mob->id;
+        respdata[i].iID = target->getID();
         respdata[i].iDamage = damage.first;
-            respdata[i].iHP = mob->hp;
+        respdata[i].iHP = target->getCurrentHP();
         respdata[i].iHitFlag = damage.second; // hitscan, not a rocket or a grenade
     }
-    }
 
     sock->sendPacket((void*)respbuf, P_FE2CL_PC_ATTACK_CHARs_SUCC, resplen);
 
@@ -724,7 +726,7 @@ static void projectileHit(CNSocket* sock, CNPacketData* data) {
         int difficulty = (int)mob->data["m_iNpcLevel"];
         damage = getDamage(damage.first, (int)mob->data["m_iProtection"], true, bullet->weaponBoost, Nanos::nanoStyle(plr->activeNano), (int)mob->data["m_iNpcStyle"], difficulty);
 
-        damage.first = hitMob(sock, mob, damage.first);
+        damage.first = mob->takeDamage(sock, damage.first);
 
         respdata[i].iID = mob->id;
         respdata[i].iDamage = damage.first;

src/Combat.hpp

@@ -23,6 +23,5 @@ namespace Combat {
     void init();
 
     void npcAttackPc(Mob *mob, time_t currTime);
-    int hitMob(CNSocket *sock, Mob *mob, int damage);
     void killMob(CNSocket *sock, Mob *mob);
 }

src/Entities.hpp

@@ -78,9 +78,11 @@ public:
     ICombatant() {}
     virtual ~ICombatant() {}
 
-    virtual void takeDamage(EntityRef, int) = 0;
+    virtual int takeDamage(EntityRef, int) = 0;
     virtual void heal(EntityRef, int) = 0;
     virtual bool isAlive() = 0;
+    virtual int getCurrentHP() = 0;
+    virtual int32_t getID() = 0;
 };
 
 /*
@@ -136,9 +138,11 @@ struct CombatNPC : public BaseNPC, public ICombatant {
 
     virtual bool isExtant() override { return hp > 0; }
 
-    virtual void takeDamage(EntityRef src, int amt) override;
+    virtual int takeDamage(EntityRef src, int amt) override;
     virtual void heal(EntityRef src, int amt) override;
     virtual bool isAlive() override;
+    virtual int getCurrentHP() override;
+    virtual int32_t getID() override;
 };
 
 // Mob is in MobAI.hpp, Player is in Player.hpp

src/Player.hpp

@@ -90,9 +90,11 @@ struct Player : public Entity, public ICombatant {
     virtual void enterIntoViewOf(CNSocket *sock) override;
     virtual void disappearFromViewOf(CNSocket *sock) override;
 
-    virtual void takeDamage(EntityRef src, int amt) override;
+    virtual int takeDamage(EntityRef src, int amt) override;
     virtual void heal(EntityRef src, int amt) override;
     virtual bool isAlive() override;
+    virtual int getCurrentHP() override;
+    virtual int32_t getID() override;
 
     sPCAppearanceData getAppearanceData();
 };

src/core/Packets.hpp

@@ -47,8 +47,8 @@ struct PacketDesc {
  * really should.
  */
 struct sGM_PVPTarget {
-    uint32_t eCT;
     uint32_t iID;
+    uint32_t eCT;
 };
 
 struct sSkillResult_Leech {