[Combat] Basic Combat Recording (#2090)

* Basic combat recording

* Update combat_record.h

zone/combat_record.cpp

@@ -0,0 +1,60 @@
+#include "combat_record.h"
+#include "../common/eqemu_logsys.h"
+#include "../common/string_util.h"
+
+void CombatRecord::Start(std::string in_mob_name)
+{
+	start_time      = std::time(nullptr);
+	end_time        = 0;
+	damage_received = 0;
+	heal_received   = 0;
+	mob_name        = in_mob_name;
+}
+
+void CombatRecord::Stop()
+{
+	end_time = std::time(nullptr);
+
+	double time_in_combat = TimeInCombat();
+
+	LogCombatRecord(
+		"[Summary] Mob [{}] [Received] DPS [{:.0f}] Heal/s [{:.0f}] Duration [{}] ({}s)",
+		mob_name,
+		time_in_combat > 0 ? (damage_received / time_in_combat) : damage_received,
+		time_in_combat > 0 ? (heal_received / time_in_combat) : heal_received,
+		time_in_combat > 0 ? ConvertSecondsToTime(time_in_combat) : "",
+		time_in_combat
+	);
+}
+
+bool CombatRecord::InCombat()
+{
+	return start_time > 0;
+}
+
+void CombatRecord::ProcessHPEvent(int hp, int current_hp)
+{
+	// damage
+	if (hp < current_hp) {
+		damage_received = damage_received + abs(current_hp - hp);
+	}
+
+	// heal
+	if (hp > current_hp && current_hp > 0) {
+		heal_received = heal_received + abs(current_hp - hp);
+	}
+
+	LogCombatRecordDetail(
+		"damage_received [{}] heal_received [{}] current_hp [{}] hp [{}] calc [{}]",
+		damage_received,
+		heal_received,
+		current_hp,
+		hp,
+		abs(current_hp - hp)
+	);
+}
+
+double CombatRecord::TimeInCombat() const
+{
+	return difftime(end_time, start_time);
+}