feat: implement freeze effect

src/game/Mobs.cpp

@@ -1,9 +1,53 @@
 #include "game/Mobs.h"
+
 #include <map>
+#include <algorithm>
 
 namespace td {
 namespace game {
 
+bool Mob::isImmuneTo(TowerType type) {
+    return std::find(getTowerImmunities().begin(), getTowerImmunities().end(), type) != getTowerImmunities().end();
+}
+
+bool Mob::isImmuneTo(EffectType type) {
+    return std::find(getEffectImmunities().begin(), getEffectImmunities().end(), type) != getEffectImmunities().end();
+}
+
+void Mob::addEffect(EffectType effectType, float durationSec) {
+    if (isImmuneTo(effectType))
+        return;
+    if (hasEffect(effectType)) {
+        auto it = std::find_if(m_Effects.begin(), m_Effects.end(), [&effectType](EffectDuration effect){ return effect.first == effectType;});
+        EffectDuration& effect = *it;
+        if(effect.second < durationSec)
+            effect.second = durationSec;    // setting new duration if it's greater then the actual
+    } else {
+        m_Effects.push_back({ effectType, durationSec });
+    }
+}
+
+void Mob::tick(std::uint64_t delta) {
+    updateEffects(delta);
+}
+
+void Mob::updateEffects(std::uint64_t delta) {
+    float deltaSec = (float)delta / 1000.0f;
+    for (auto it = m_Effects.begin(); it != m_Effects.end(); it++) {
+        EffectDuration& effect = *it;
+        effect.second -= deltaSec;
+        if (effect.second < 0)   // effect has gone
+            m_Effects.erase(it);
+    }
+}
+
+bool Mob::hasEffect(EffectType type) {
+    return std::find_if(m_Effects.begin(), m_Effects.end(), [&type](EffectDuration effect){ return effect.first == type;}) != m_Effects.end();
+}
+
+
+
+
 typedef std::pair<MobType, std::uint8_t> MobKey;
 
 const std::map<MobKey, MobStats> MobConstants = {