Variable damage to/from mobs

* Player weapons and armor ratings are taken into account when damaging/getting damaged by mobs.
* Players have a 5% chance to critical strike mobs, this doubles the player's weapon power.
* Aside from player and mob stat based damage variance, there is also an inherent 20% variance to any damage.

src/ItemManager.cpp

@@ -123,6 +123,9 @@ void ItemManager::itemMoveHandler(CNSocket* sock, CNPacketData* data) {
 
         // send equip event to other players
         PlayerManager::sendToViewable(sock, (void*)&equipChange, P_FE2CL_PC_EQUIP_CHANGE, sizeof(sP_FE2CL_PC_EQUIP_CHANGE));
+        
+        // set equipment stats serverside
+        setItemStats(plr.plr);
     }
 
     // send response
@@ -859,3 +862,19 @@ void ItemManager::checkItemExpire(CNSocket* sock, Player* player) {
     player->toRemoveVehicle.eIL = 0;
     player->toRemoveVehicle.iSlotNum = 0;
 }
+
+void ItemManager::setItemStats(Player* plr) {
+
+    plr->pointDamage = 8 + plr->level * 2;
+    plr->groupDamage = 8 + plr->level * 2;
+    plr->defense = 16 + plr->level * 4;
+
+    Item* itemStatsDat;
+
+    for (int i = 0; i < 4; i++) {
+        itemStatsDat = ItemManager::getItemData(plr->Equip[i].iID, plr->Equip[i].iType);
+        plr->pointDamage += itemStatsDat->pointDamage;
+        plr->groupDamage += itemStatsDat->groupDamage;
+        plr->defense += itemStatsDat->defense;
+    }
+} 

src/ItemManager.hpp

@@ -5,7 +5,7 @@
 
 struct Item {
     bool tradeable, sellable;
-    int buyPrice, sellPrice, stackSize, level, rarity; // TODO: implement more as needed
+    int buyPrice, sellPrice, stackSize, level, rarity, pointDamage, groupDamage, defense; // TODO: implement more as needed
 };
 struct VendorListing {
     int sort, type, iID;
@@ -49,4 +49,5 @@ namespace ItemManager {
     int findFreeSlot(Player *plr);
     Item* getItemData(int32_t id, int32_t type);
     void checkItemExpire(CNSocket* sock, Player* player);
+    void setItemStats(Player* plr);
 }

src/MobManager.cpp

@@ -61,12 +61,19 @@ void MobManager::pcAttackNpcs(CNSocket *sock, CNPacketData *data) {
         }
         Mob *mob = Mobs[pktdata[i]];
 
-        int damage = hitMob(sock, mob, 150);
+        std::pair<int,int> damage;
+
+        if (pkt->iNPCCnt > 1)
+            damage = getDamage(plr->groupDamage, (int)mob->data["m_iProtection"], true);
+        else
+            damage = getDamage(plr->pointDamage, (int)mob->data["m_iProtection"], true);
+
+        damage.first = hitMob(sock, mob, damage.first);
 
         respdata[i].iID = mob->appearanceData.iNPC_ID;
-        respdata[i].iDamage = damage;
+        respdata[i].iDamage = damage.first;
         respdata[i].iHP = mob->appearanceData.iHP;
-        respdata[i].iHitFlag = 2; // hitscan, not a rocket or a grenade
+        respdata[i].iHitFlag = damage.second; // hitscan, not a rocket or a grenade
     }
 
     sock->sendPacket((void*)respbuf, P_FE2CL_PC_ATTACK_NPCs_SUCC, resplen);
@@ -93,15 +100,16 @@ void MobManager::npcAttackPc(Mob *mob) {
     sP_FE2CL_NPC_ATTACK_PCs *pkt = (sP_FE2CL_NPC_ATTACK_PCs*)respbuf;
     sAttackResult *atk = (sAttackResult*)(respbuf + sizeof(sP_FE2CL_NPC_ATTACK_PCs));
 
-    plr->HP += (int)mob->data["m_iPower"]; // already negative
+    auto damage = getDamage(440 + (int)mob->data["m_iPower"], plr->defense, false);
+    plr->HP -= damage.first;
 
     pkt->iNPC_ID = mob->appearanceData.iNPC_ID;
     pkt->iPCCnt = 1;
 
     atk->iID = plr->iID;
-    atk->iDamage = -(int)mob->data["m_iPower"];
+    atk->iDamage = damage.first;
     atk->iHP = plr->HP;
-    atk->iHitFlag = 2;
+    atk->iHitFlag = damage.second;
 
     mob->target->sendPacket((void*)respbuf, P_FE2CL_NPC_ATTACK_PCs, resplen);
     PlayerManager::sendToViewable(mob->target, (void*)respbuf, P_FE2CL_NPC_ATTACK_PCs, resplen);
@@ -564,3 +572,20 @@ void MobManager::playerTick(CNServer *serv, time_t currTime) {
         }
     }
 }
+
+std::pair<int,int> MobManager::getDamage(int attackPower, int defensePower, bool shouldCrit) {
+
+    std::pair<int,int> ret = {};
+
+    int damage = attackPower * (rand() % 40 + 80) / 100; // 20% variance
+    ret.second = 1;
+
+    if (shouldCrit && rand() % 20 == 0) {
+        damage *= 2; // critical hit
+        ret.second = 2;
+    }
+
+    ret.first = std::max(std::min(damage, damage * damage / defensePower / 4), std::min(damage * damage / defensePower / 2, damage - defensePower));
+
+    return ret;
+}

src/MobManager.hpp

@@ -104,4 +104,5 @@ namespace MobManager {
     void killMob(CNSocket *sock, Mob *mob);
     void giveReward(CNSocket *sock);
     std::pair<int,int> lerp(int, int, int, int, int);
+    std::pair<int,int> getDamage(int, int, bool);
 }

src/Player.hpp

@@ -46,6 +46,10 @@ struct Player {
 
     bool inCombat;
     bool dotDamage;
+    
+    int pointDamage;
+    int groupDamage;
+    int defense;
 
     int64_t aQuestFlag[16];
     int tasks[ACTIVE_MISSION_COUNT];

src/PlayerManager.cpp

@@ -316,6 +316,9 @@ void PlayerManager::enterPlayer(CNSocket* sock, CNPacketData* data) {
     addPlayer(sock, plr);
     //check if there is an expiring vehicle
     ItemManager::checkItemExpire(sock, getPlayer(sock));
+    
+    //set player equip stats
+    ItemManager::setItemStats(getPlayer(sock));
 }
 
 void PlayerManager::sendToViewable(CNSocket* sock, void* buf, uint32_t type, size_t size) {

src/TableData.cpp

@@ -117,8 +117,7 @@ void TableData::init() {
                 auto item = _item.value();
                 int typeOverride = getItemType(i); // used for special cases where iEquipLoc doesn't indicate item type
                 ItemManager::ItemData[std::pair<int32_t, int32_t>(item["m_iItemNumber"], typeOverride != -1 ? typeOverride : (int)item["m_iEquipLoc"])]
-                = { item["m_iTradeAble"] == 1, item["m_iSellAble"] == 1, item["m_iItemPrice"], item["m_iItemSellPrice"], item["m_iStackNumber"], i > 9 ? 0 : (int)item["m_iMinReqLev"],
-                i > 9 ? 1 : (int)item["m_iRarity"] };
+                = { item["m_iTradeAble"] == 1, item["m_iSellAble"] == 1, item["m_iItemPrice"], item["m_iItemSellPrice"], item["m_iStackNumber"], i > 9 ? 0 : (int)item["m_iMinReqLev"], i > 9 ? 1 : (int)item["m_iRarity"], i > 9 ? 0 : (int)item["m_iPointRat"], i > 9 ? 0 : (int)item["m_iGroupRat"], i > 9 ? 0 : (int)item["m_iDefenseRat"] };
             }
         }