Scripts/Spells: Fix monk roll (#27736)

Co-authored-by: Shauren <shauren.trinity@gmail.com>

1 files changed, 76 insertions, 0 deletions

diff --git a/src/server/scripts/Spells/spell_monk.cpp b/src/server/scripts/Spells/spell_monk.cpp
index 3190821f404..7ac66095f98 100644
--- a/src/server/scripts/Spells/spell_monk.cpp
+++ b/src/server/scripts/Spells/spell_monk.cpp
@@ -37,6 +37,9 @@ enum MonkSpells
     SPELL_MONK_CRACKLING_JADE_LIGHTNING_KNOCKBACK_CD    = 117953,
     SPELL_MONK_PROVOKE_SINGLE_TARGET                    = 116189,
     SPELL_MONK_PROVOKE_AOE                              = 118635,
+    SPELL_MONK_NO_FEATHER_FALL                          = 79636,
+    SPELL_MONK_ROLL_BACKWARD                            = 109131,
+    SPELL_MONK_ROLL_FORWARD                             = 107427,
     SPELL_MONK_SOOTHING_MIST                            = 115175,
     SPELL_MONK_STANCE_OF_THE_SPIRITED_CRANE             = 154436,
     SPELL_MONK_STAGGER_DAMAGE_AURA                      = 124255,
@@ -164,6 +167,77 @@ class spell_monk_provoke : public SpellScript
     }
 };
 
+// 109132 - Roll
+class spell_monk_roll : public SpellScript
+{
+    PrepareSpellScript(spell_monk_roll);
+
+    bool Validate(SpellInfo const* /*spellInfo*/) override
+    {
+        return ValidateSpellInfo({ SPELL_MONK_ROLL_BACKWARD, SPELL_MONK_ROLL_FORWARD, SPELL_MONK_NO_FEATHER_FALL });
+    }
+
+    SpellCastResult CheckCast()
+    {
+        if (GetCaster()->HasUnitState(UNIT_STATE_ROOT))
+            return SPELL_FAILED_ROOTED;
+        return SPELL_CAST_OK;
+    }
+
+    void HandleDummy(SpellEffIndex /*effIndex*/)
+    {
+        GetCaster()->CastSpell(GetCaster(), GetCaster()->HasUnitMovementFlag(MOVEMENTFLAG_BACKWARD) ? SPELL_MONK_ROLL_BACKWARD : SPELL_MONK_ROLL_FORWARD,
+            TRIGGERED_IGNORE_CAST_IN_PROGRESS);
+        GetCaster()->CastSpell(GetCaster(), SPELL_MONK_NO_FEATHER_FALL, true);
+    }
+
+    void Register() override
+    {
+        OnCheckCast += SpellCheckCastFn(spell_monk_roll::CheckCast);
+        OnEffectHitTarget += SpellEffectFn(spell_monk_roll::HandleDummy, EFFECT_0, SPELL_EFFECT_DUMMY);
+    }
+};
+
+// 107427 - Roll
+// 109131 - Roll (backward)
+class spell_monk_roll_aura : public AuraScript
+{
+    PrepareAuraScript(spell_monk_roll_aura);
+
+    void CalcMovementAmount(AuraEffect const* /*aurEff*/, int32& amount, bool& /*canBeRecalculated*/)
+    {
+        amount += 100;
+    }
+
+    void CalcImmunityAmount(AuraEffect const* /*aurEff*/, int32& amount, bool& /*canBeRecalculated*/)
+    {
+        amount -= 100;
+    }
+
+    void ChangeRunBackSpeed(AuraEffect const* /*aurEff*/, AuraEffectHandleModes /*mode*/)
+    {
+        GetTarget()->SetSpeed(MOVE_RUN_BACK, GetTarget()->GetSpeed(MOVE_RUN));
+    }
+
+    void RestoreRunBackSpeed(AuraEffect const* /*aurEff*/, AuraEffectHandleModes /*mode*/)
+    {
+        GetTarget()->UpdateSpeed(MOVE_RUN_BACK);
+    }
+
+    void Register() override
+    {
+        // Values need manual correction
+        DoEffectCalcAmount += AuraEffectCalcAmountFn(spell_monk_roll_aura::CalcMovementAmount, EFFECT_0, SPELL_AURA_MOD_SPEED_NO_CONTROL);
+        DoEffectCalcAmount += AuraEffectCalcAmountFn(spell_monk_roll_aura::CalcMovementAmount, EFFECT_2, SPELL_AURA_MOD_MINIMUM_SPEED);
+        DoEffectCalcAmount += AuraEffectCalcAmountFn(spell_monk_roll_aura::CalcImmunityAmount, EFFECT_5, SPELL_AURA_MECHANIC_IMMUNITY);
+        DoEffectCalcAmount += AuraEffectCalcAmountFn(spell_monk_roll_aura::CalcImmunityAmount, EFFECT_6, SPELL_AURA_MECHANIC_IMMUNITY);
+
+        // This is a special aura that sets backward run speed equal to forward speed
+        AfterEffectApply += AuraEffectApplyFn(spell_monk_roll_aura::ChangeRunBackSpeed, EFFECT_4, SPELL_AURA_USE_NORMAL_MOVEMENT_SPEED, AURA_EFFECT_HANDLE_REAL);
+        AfterEffectRemove += AuraEffectApplyFn(spell_monk_roll_aura::RestoreRunBackSpeed, EFFECT_4, SPELL_AURA_USE_NORMAL_MOVEMENT_SPEED, AURA_EFFECT_HANDLE_REAL);
+    }
+};
+
 // Utility for stagger scripts
 Aura* FindExistingStaggerEffect(Unit* unit)
 {
@@ -392,6 +466,8 @@ void AddSC_monk_spell_scripts()
     RegisterSpellScript(spell_monk_crackling_jade_lightning);
     RegisterSpellScript(spell_monk_crackling_jade_lightning_knockback_proc_aura);
     RegisterSpellScript(spell_monk_provoke);
+    RegisterSpellScript(spell_monk_roll);
+    RegisterSpellScript(spell_monk_roll_aura);
     RegisterSpellScript(spell_monk_stagger);
     RegisterSpellScript(spell_monk_stagger_damage_aura);
     RegisterSpellScript(spell_monk_stagger_debuff_aura);