Big update.

src/strategy/values/EnemyHealerTargetValue.cpp

@@ -0,0 +1,37 @@
+/*
+ * 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 "EnemyHealerTargetValue.h"
+#include "Playerbots.h"
+#include "ServerFacade.h"
+
+Unit* EnemyHealerTargetValue::Calculate()
+{
+    std::string const spell = qualifier;
+
+    GuidVector attackers = botAI->GetAiObjectContext()->GetValue<GuidVector>("attackers")->Get();
+    Unit* target = botAI->GetAiObjectContext()->GetValue<Unit*>("current target")->Get();
+    for (ObjectGuid const guid : attackers)
+    {
+        Unit* unit = botAI->GetUnit(guid);
+        if (!unit || unit == target)
+            continue;
+
+        if (sServerFacade->GetDistance2d(bot, unit) > botAI->GetRange("spell"))
+            continue;
+
+        if (!botAI->IsInterruptableSpellCasting(unit, spell))
+            continue;
+
+        Spell* spell = unit->GetCurrentSpell(CURRENT_GENERIC_SPELL);
+        if (spell && spell->m_spellInfo->IsPositive())
+            return unit;
+
+        spell = unit->GetCurrentSpell(CURRENT_CHANNELED_SPELL);
+        if (spell && spell->m_spellInfo->IsPositive())
+            return unit;
+    }
+
+    return nullptr;
+}