stop using global variables

pkg/memory/game_reader.go

@@ -6,7 +6,8 @@ import (
 )
 
 type GameReader struct {
-	offset Offset
+	offset       Offset
+	previousRead data.Data
 	Process
 }
 
@@ -17,8 +18,6 @@ func NewGameReader(process Process) *GameReader {
 	}
 }
 
-var previousData *data.Data
-
 func (gd *GameReader) GetData() data.Data {
 	if gd.offset.UnitTable == 0 {
 		gd.offset = calculateOffsets(gd.Process)
@@ -27,7 +26,7 @@ func (gd *GameReader) GetData() data.Data {
 	roster := gd.getRoster()
 	playerUnitPtr, corpse := gd.GetPlayerUnitPtr(roster)
 
-	pu := gd.GetPlayerUnit(playerUnitPtr)
+	pu := gd.GetPlayerUnit(playerUnitPtr, gd.previousRead.PlayerUnit.MaxHPValue, gd.previousRead.PlayerUnit.MaxMPValue)
 	hover := gd.hoveredData()
 
 	// Quests
@@ -51,10 +50,10 @@ func (gd *GameReader) GetData() data.Data {
 	}
 
 	if playerUnitPtr == 0 {
-		return *previousData
+		return gd.previousRead
 	}
 
-	previousData = &d
+	gd.previousRead = d
 
 	return d
 }

pkg/memory/player.go

@@ -76,7 +76,14 @@ func (gd *GameReader) GetPlayerUnitPtr(roster data.Roster) (playerUnitPtr uintpt
 	return
 }
 
-func (gd *GameReader) GetPlayerUnit(playerUnit uintptr) data.PlayerUnit {
+func (gd *GameReader) GetPlayerUnit(playerUnit uintptr, previousHP, previousMP *data.PointCounter) data.PlayerUnit {
+	if previousHP == nil {
+		previousHP = &data.PointCounter{}
+	}
+	if previousMP == nil {
+		previousMP = &data.PointCounter{}
+	}
+
 	unitID := gd.Process.ReadUInt(playerUnit+0x08, Uint32)
 
 	// Read X and Y Positions
@@ -148,7 +155,7 @@ func (gd *GameReader) GetPlayerUnit(playerUnit uintptr) data.PlayerUnit {
 		}
 	}
 
-	return data.PlayerUnit{
+	d := data.PlayerUnit{
 		Name: name,
 		ID:   data.UnitID(unitID),
 		Area: area.Area(levelNo),
@@ -163,7 +170,15 @@ func (gd *GameReader) GetPlayerUnit(playerUnit uintptr) data.PlayerUnit {
 		LeftSkill:          skill.ID(leftSkillId),
 		RightSkill:         skill.ID(rightSkillId),
 		AvailableWaypoints: availableWPs,
+		MaxHPValue:         previousHP,
+		MaxMPValue:         previousMP,
 	}
+
+	// Recalculate max HP and MP
+	d.HPPercent()
+	d.MPPercent()
+
+	return d
 }
 
 func (gd *GameReader) getSkills(skillListPtr uintptr) map[skill.ID]skill.Points {