[Gear] Gloom-Spattered Dreadscale (#11291)

* [Gear] Gloom-Spattered Dreadscale

* * Remove absorb action
* Accumulate shield amount on impact and trigger and reset on execute
* Get spell coefficient from on-equip effect

* * Fix absorb reporting

Author: justindriggers

engine/player/unique_gear_midnight.cpp

@@ -2920,6 +2920,71 @@ void tangle_of_vibrant_vines( special_effect_t& effect )
 
   new dbc_proc_callback_t( effect.player, effect );
 }
+
+// 1260633 driver
+// 1260627 damage
+// 1263141 absorb
+void gloomspattered_dreadscale( special_effect_t& effect )
+{
+  struct fractional_absorb_t : public absorb_buff_t
+  {
+    double absorb_fraction;
+
+    fractional_absorb_t( player_t* player, std::string_view name, const spell_data_t* spell,
+                         const item_t* item = nullptr )
+      : absorb_buff_t( player, name, spell, item ), absorb_fraction( 1.0 )
+    {
+    }
+
+    double consume( double amount, action_state_t* state = nullptr ) override
+    {
+      return absorb_buff_t::consume( amount * absorb_fraction, state );
+    }
+
+    absorb_buff_t* set_absorb_fraction( double fraction )
+    {
+      absorb_fraction = fraction;
+      return this;
+    }
+  };
+
+  struct gloomspattered_dreadscale_t : public generic_aoe_proc_t
+  {
+    buff_t* absorb;
+    double shield_amount;
+
+    gloomspattered_dreadscale_t( const special_effect_t& effect )
+      : generic_aoe_proc_t( effect, "gloomspattered_dreadscale", effect.driver(), true ), shield_amount( 0 )
+    {
+      auto equip = find_special_effect( effect.player, 1260627 );
+      assert( equip && "Gloom-Spattered Dreadscale missing equip effect" );
+
+      base_dd_min = base_dd_max = equip->driver()->effectN( 1 ).average( effect );
+
+      auto absorb_spell = effect.player->find_spell( 1263141 );
+      absorb = create_buff<fractional_absorb_t>( effect.player, name(), absorb_spell )
+                   ->set_absorb_fraction( absorb_spell->effectN( 2 ).percent() )
+                   ->set_absorb_source( effect.player->get_stats( "gloomspattered_dreadscale_absorb", this ) );
+    }
+
+    void execute() override
+    {
+      generic_aoe_proc_t::execute();
+
+      absorb->trigger( -1, shield_amount );
+      shield_amount = 0;
+    }
+
+    void impact( action_state_t* state ) override
+    {
+      generic_aoe_proc_t::impact( state );
+
+      shield_amount += state->result_amount;
+    }
+  };
+
+  effect.execute_action = create_proc_action<gloomspattered_dreadscale_t>( "gloomspattered_dreadscale", effect );
+}
 }  // namespace trinkets
 
 namespace weapons
@@ -3552,6 +3617,8 @@ void register_special_effects()
   register_special_effect( 1247311, DISABLED_EFFECT ); // Drum of Renewed Bonds on use
   register_special_effect( 1253120, trinkets::glorious_crusaders_keepsake ); 
   register_special_effect( 1253112, trinkets::sylvan_wakrapuku );
+  register_special_effect( 1260633, trinkets::gloomspattered_dreadscale );
+  register_special_effect( 1260627, DISABLED_EFFECT );  // Gloom-Spattered Dreadscale Passive Driver
   // Weapons
   register_special_effect( { 1253357, 1253359 }, weapons::torments_duality );  // umbral sabre & radiant foil
   register_special_effect( 1266257, weapons::lightless_lament );