1 files changed, 139 insertions, 0 deletions
diff --git a/src/battle/mechanic/action/btl_action_use_skill.erl b/src/battle/mechanic/action/btl_action_use_skill.erl
new file mode 100644
index 0000000..154d7db
--- /dev/null
+++ b/src/battle/mechanic/action/btl_action_use_skill.erl
@@ -0,0 +1,139 @@
+-module(btl_action_use_skill).
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+%% TYPES %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+-include("tacticians/conditions.hrl").
+
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+%% EXPORTS %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+-export
+(
+   [
+      handle/2
+   ]
+).
+
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+%% LOCAL FUNCTIONS %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+-spec pay_for_cast
+   (
+      non_neg_integer(),
+      btl_character_turn_update:type()
+   )
+   -> {btl_character_turn_update:type(), shr_skill:type()}.
+pay_for_cast (ActorIX, S0Update) ->
+   S0Battle = btl_character_turn_update:get_battle(S0Update),
+   S0Actor = btl_battle:get_character(ActorIX, S0Battle),
+   BaseActor = btl_character:get_base_character(S0Actor),
+   Equipment = shr_character:get_equipment(BaseActor),
+   Skill = shr_equipment:get_skill(Equipment),
+
+   SkillCost = shr_skill:get_cost(Skill),
+   S0SkillPoints = btl_character:get_skill_points(S0Actor),
+   S1SkillPoints = (S0SkillPoints - SkillCost),
+
+   {S1Actor, ActorAtaxiaUpdate} =
+      case (S1SkillPoints < 0) of
+         true -> error({skill, points, S0SkillPoints, Skill});
+         false ->
+            btl_character:ataxia_set_skill_points(S1SkillPoints, S0Actor)
+      end,
+
+   {S1Battle, BattleAtaxiaUpdate} =
+      btl_battle:ataxia_set_character
+      (
+         ActorIX,
+         S1Actor,
+         ActorAtaxiaUpdate,
+         S0Battle
+      ),
+
+   S1Update =
+      btl_character_turn_update:ataxia_set_battle
+      (
+         S1Battle,
+         BattleAtaxiaUpdate,
+         S0Update
+      ),
+
+   {S1Update, Skill}.
+
+-spec cast_skill
+   (
+      btl_action:type(),
+      btl_character_turn_update:type()
+   )
+   -> btl_character_turn_update:type().
+cast_skill (Action, S0Update) ->
+   ActorIX = btl_action:get_actor_index(Action),
+   {S1Update, Skill} = pay_for_cast(ActorIX, S0Update),
+
+   S2Update =
+      erlang:apply
+      (
+         shr_skill:get_module(Skill),
+         cast,
+         [Skill, Action, S1Update]
+      ),
+
+   {none, S3Update} =
+      btl_condition:apply_to_character
+      (
+         ActorIX,
+         ?CONDITION_TRIGGER_HAS_USED_THEIR_SKILL,
+         Action,
+         none,
+         S2Update
+      ),
+
+   {none, S3Update} =
+      btl_condition:apply_to_battle
+      (
+         ?CONDITION_TRIGGER_A_CHARACTER_HAS_USED_THEIR_SKILL,
+         Action,
+         none,
+         S2Update
+      ),
+
+   S3Update.
+
+
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+%% EXPORTED FUNCTIONS %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+-spec handle
+   (
+      btl_action:type(),
+      btl_character_turn_update:type()
+   )
+   -> btl_character_turn_update:type().
+handle (S0Action, S0Update) ->
+   ActorIX = btl_action:get_actor_index(S0Action),
+
+   S0PerformAction = true,
+
+   {{S1Action, S1PerformAction}, S1Update} =
+      btl_condition:apply_to_character
+      (
+         ActorIX,
+         ?CONDITION_TRIGGER_ABOUT_TO_USE_THEIR_SKILL,
+         none,
+         {S0Action, S0PerformAction},
+         S0Update
+      ),
+
+   {{S2Action, S2PerformAction}, S2Update} =
+      btl_condition:apply_to_battle
+      (
+         ?CONDITION_TRIGGER_A_CHARACTER_IS_ABOUT_TO_USE_THEIR_SKILL,
+         none,
+         {S1Action, S1PerformAction},
+         S1Update
+      ),
+
+   case S2PerformAction of
+      true -> cast_skill(S2Action, S2Update);
+      false -> S2Update
+   end.