Add BLOCK_MAGIC_BELOW bonus

lib/HeroBonus.h

@@ -239,6 +239,7 @@ private:
 	BONUS_NAME(FIRST_STRIKE) /* first counterattack, then attack if possible */\
 	BONUS_NAME(SYNERGY_TARGET) /* dummy skill for alternative upgrades mod */\
 	BONUS_NAME(SHOOTS_ALL_ADJACENT) /* H4 Cyclops-like shoot (attacks all hexes neighboring with target) without spell-like mechanics */\
+	BONUS_NAME(BLOCK_MAGIC_BELOW) /*blocks casting spells of the level < value */ \
 	/* end of list */
 
 

lib/battle/CBattleInfoCallback.cpp

@@ -1647,6 +1647,24 @@ int CBattleInfoCallback::battleGetSurrenderCost(PlayerColor Player) const
 	return ret;
 }
 
+si8 CBattleInfoCallback::battleMinSpellLevel(ui8 side) const
+{
+	const IBonusBearer *node = nullptr;
+	if(const CGHeroInstance * h = battleGetFightingHero(side))
+		node = h;
+	else
+		node = getBattleNode();
+
+	if(!node)
+		return 1;
+
+	auto b = node->getBonuses(Selector::type(Bonus::BLOCK_MAGIC_BELOW));
+	if(b->size())
+		return b->totalValue();
+
+	return 1;
+}
+
 si8 CBattleInfoCallback::battleMaxSpellLevel(ui8 side) const
 {
 	const IBonusBearer *node = nullptr;

lib/battle/CBattleInfoCallback.h

@@ -75,6 +75,7 @@ public:
 	std::vector<BattleHex> getAttackableBattleHexes() const;
 
 	//*** MAGIC
+	si8 battleMinSpellLevel(ui8 side) const; //calculates maximum spell level possible to be cast on battlefield - takes into account artifacts of both heroes; if no effects are set, 0 is returned
 	si8 battleMaxSpellLevel(ui8 side) const; //calculates minimum spell level possible to be cast on battlefield - takes into account artifacts of both heroes; if no effects are set, 0 is returned
 	ui32 battleGetSpellCost(const CSpell * sp, const CGHeroInstance * caster) const; //returns cost of given spell
 	ESpellCastProblem::ESpellCastProblem battleCanCastSpell(const ISpellCaster * caster, ECastingMode::ECastingMode mode) const; //returns true if there are no general issues preventing from casting a spell

lib/spells/CSpellHandler.cpp

@@ -194,7 +194,7 @@ ESpellCastProblem::ESpellCastProblem CSpell::canBeCast(const CBattleInfoCallback
 	//effect like Recanter's Cloak. Blocks also passive casting.
 	//TODO: check creature abilities to block
 	//TODO: check any possible caster
-	if(cb->battleMaxSpellLevel(side.get()) < level)
+	if(cb->battleMaxSpellLevel(side.get()) < level || cb->battleMinSpellLevel(side.get()) > level)
 		return ESpellCastProblem::SPELL_LEVEL_LIMIT_EXCEEDED;
 
 	const ESpellCastProblem::ESpellCastProblem specificProblem = mechanics->canBeCast(cb, mode, caster);