fix: fix Player.setCurrentExperience (#243)

Author: xiaoqch

src/legacy/api/PlayerAPI.cpp

@@ -2006,8 +2006,7 @@ Local<Value> PlayerClass::setCurrentExperience(const Arguments& args) {
             return Local<Value>();
         }
 
-        auto attribute = player->getMutableAttribute(Player::EXPERIENCE());
-        AttributeHelper::setCurrentValue(attribute, args[0].asNumber().toFloat());
+        PlayerHelper::setXpEarnedAtCurrentLevel(player, args[0].asNumber().toInt32());
         return Boolean::newBoolean(true);
     }
     CATCH("Fail in setCurrentExperience!");

src/lse/api/helper/PlayerHelper.cpp

@@ -1,10 +1,14 @@
 #include "PlayerHelper.h"
 
+#include "AttributeHelper.h"
 #include "mc/world/actor/player/Player.h"
 #include "mc/world/attribute/AttributeInstance.h"
+#include "mc/world/attribute/AttributeModificationContext.h"
+#include "mc/world/attribute/MutableAttributeWithContext.h"
 
 namespace lse::api {
-unsigned int PlayerHelper::getXpEarnedAtCurrentLevel(Player* player) {
+
+unsigned int PlayerHelper::getPreviousLevelRequirement(Player* player) {
     int prevLevelReq = player->mPreviousLevelRequirement;
     if (player->mPlayerLevelChanged) {
         int curLvl                        = player->getAttribute(Player::LEVEL()).mCurrentValue;
@@ -13,7 +17,20 @@ unsigned int PlayerHelper::getXpEarnedAtCurrentLevel(Player* player) {
         player->mPlayerLevelChanged       = false;
         player->mPreviousLevelRequirement = prevLevelReq;
     }
-    auto& attribute = player->getAttribute(Player::EXPERIENCE());
+    return prevLevelReq;
+}
+
+unsigned int PlayerHelper::getXpEarnedAtCurrentLevel(Player* player) {
+    unsigned int prevLevelReq = PlayerHelper::getPreviousLevelRequirement(player);
+    auto&        attribute    = player->getAttribute(Player::EXPERIENCE());
     return (unsigned int)roundf(attribute.mCurrentValue * (float)prevLevelReq);
 }
+
+bool PlayerHelper::setXpEarnedAtCurrentLevel(Player* player, unsigned int xp) {
+    unsigned int prevLevelReq = PlayerHelper::getPreviousLevelRequirement(player);
+    auto         attribute    = player->getMutableAttribute(Player::EXPERIENCE());
+    AttributeHelper::setCurrentValue(attribute, (float)xp / (float)prevLevelReq);
+    return true;
+}
+
 } // namespace lse::api

src/lse/api/helper/PlayerHelper.h

@@ -3,6 +3,10 @@ class Player;
 namespace lse::api {
 class PlayerHelper {
 public:
+    static unsigned int getPreviousLevelRequirement(Player* player);
+
     static unsigned int getXpEarnedAtCurrentLevel(Player* player);
+
+    static bool setXpEarnedAtCurrentLevel(Player* player, unsigned int xp);
 };
 } // namespace lse::api