1 files changed, 102 insertions, 0 deletions
diff --git a/src/battle/struct/btl_action.erl b/src/battle/struct/btl_action.erl
new file mode 100644
index 0000000..34dd46e
--- /dev/null
+++ b/src/battle/struct/btl_action.erl
@@ -0,0 +1,102 @@
+-module(btl_action).
+
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+%% TYPES %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+-record
+(
+   move,
+   {
+      path :: list(shr_direction:enum())
+   }
+).
+
+-record
+(
+   switch_weapon,
+   {
+   }
+).
+
+-record
+(
+   attack,
+   {
+      target_ix :: non_neg_integer()
+   }
+).
+
+-type category() :: ('move' | 'switch_weapon' | 'attack' | 'nothing').
+-opaque type() :: (#move{} | #switch_weapon{} | #attack{}).
+
+-export_type([category/0, type/0]).
+
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+%% EXPORTS %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+-export
+(
+   [
+      maybe_decode_move/1,
+      maybe_decode_weapon_switch/1,
+      maybe_decode_attack/1,
+      can_follow/2
+   ]
+).
+
+-export
+(
+   [
+      get_path/1,
+      get_target_ix/1,
+      get_category/1
+   ]
+).
+
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+%% LOCAL FUNCTIONS %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+%% EXPORTED FUNCTIONS %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+-spec maybe_decode_move (list(shr_direction:type())) -> list(type()).
+maybe_decode_move ([]) -> [];
+maybe_decode_move (PathInBinary) ->
+   Path = lists:map(fun shr_direction:decode/1, PathInBinary),
+
+   [#move{ path = Path }].
+
+-spec maybe_decode_attack (integer()) -> list(type()).
+maybe_decode_attack (TargetIX) when (TargetIX < 0) -> [];
+maybe_decode_attack (TargetIX) -> [#attack{ target_ix = TargetIX }].
+
+-spec maybe_decode_weapon_switch (boolean()) -> list(type()).
+maybe_decode_weapon_switch (false) -> [];
+maybe_decode_weapon_switch (true) -> [#switch_weapon{}].
+
+-spec can_follow (category(), category()) -> boolean().
+can_follow (nothing, attack) -> true;
+can_follow (nothing, switch_weapon) -> true;
+can_follow (nothing, move) -> true;
+can_follow (move, switch_weapon) -> true;
+can_follow (move, attack) -> true;
+can_follow (_, _) -> false.
+
+-spec get_path (type()) -> list(shr_direction:type()).
+get_path (Action) when is_record(Action, move) ->
+   Action#move.path;
+get_path (_) ->
+   [].
+
+-spec get_target_ix (type()) -> non_neg_integer().
+get_target_ix (Action) when is_record(Action, attack) ->
+   Action#attack.target_ix;
+get_target_ix (_) ->
+   [].
+
+-spec get_category (type()) -> category().
+get_category (Action) when is_record(Action, attack) -> attack;
+get_category (Action) when is_record(Action, move) -> move;
+get_category (Action) when is_record(Action, switch_weapon) -> switch_weapon.
+