Big update.

src/strategy/Trigger.cpp

@@ -0,0 +1,49 @@
+/*
+ * Copyright (C) 2016+ AzerothCore <www.azerothcore.org>, released under GNU GPL v2 license, you may redistribute it and/or modify it under version 2 of the License, or (at your option), any later version.
+ */
+
+#include "Trigger.h"
+#include "Event.h"
+#include "Playerbots.h"
+
+Trigger::Trigger(PlayerbotAI* botAI, std::string const name, int32 checkInterval) :
+    AiNamedObject(botAI, name), checkInterval(checkInterval), lastCheckTime(time(nullptr) - rand() % checkInterval)
+{
+}
+
+Event Trigger::Check()
+{
+	if (IsActive())
+	{
+		Event event(getName());
+		return event;
+	}
+
+	Event event;
+	return event;
+}
+
+Value<Unit*>* Trigger::GetTargetValue()
+{
+    return context->GetValue<Unit*>(GetTargetName());
+}
+
+Unit* Trigger::GetTarget()
+{
+    return GetTargetValue()->Get();
+}
+
+bool Trigger::needCheck()
+{
+    if (checkInterval < 2)
+        return true;
+
+    time_t now = time(nullptr);
+    if (!lastCheckTime || now - lastCheckTime >= checkInterval)
+    {
+        lastCheckTime = now;
+        return true;
+    }
+
+    return false;
+}