Starting to work on attacks.

I find it difficult to keep the code tidy in Erlang...

1 files changed, 122 insertions, 28 deletions

diff --git a/www/handler/battlemap/character_turn.yaws b/www/handler/battlemap/character_turn.yaws
index 83a3570..2b3f818 100644
--- a/www/handler/battlemap/character_turn.yaws
+++ b/www/handler/battlemap/character_turn.yaws
@@ -12,6 +12,21 @@
       target_id
    }
 ).
+-record
+(
+   query_state,
+   {
+      input,
+      battlemap,
+      battlemap_inst,
+      main_char,
+      main_char_inst,
+      main_char_new_loc,
+      target_char,
+      target_char_inst
+   }
+).
+
 
 -include("/my/src/tacticians-server/src/timed_cache_data.hrl").
 
@@ -28,54 +43,133 @@ parse_input (Req) ->
       target_id = maps:get(<<"target_id">>, JSONReqMap)
    }.
 
-handle (Req) ->
-   %%%% Parse
-   Input = parse_input(Req),
-   %%%% Fetch
+fetch_data (Input) ->
    Battlemap = timed_cache:fetch(battlemap_db, Input#input.battlemap_id),
-   BattlemapInstance =
+   BattlemapInst =
       timed_cache:fetch
       (
          battlemap_instance_db,
          <<"0">>
       ),
-   Character = timed_cache:fetch(character_db, Input#input.char_id),
-   CharInst =
+   MainChar = timed_cache:fetch(character_db, Input#input.char_id),
+   MainCharInst =
       battlemap_instance:get_char_instance
       (
-         BattlemapInstance,
+         BattlemapInst,
          Input#input.char_id
       ),
-   %%%% Calc
+   case Input#input.target_id of
+      <<"">> ->
+         TargetChar = nothing,
+         TargetCharInst = nothing;
+
+      TargetID ->
+         TargetChar = timed_cache:fetch(character_db, TargetID),
+         TargetCharInst =
+            battlemap_instance:get_char_instance
+            (
+               BattlemapInst,
+               TargetID
+            )
+   end,
+   #query_state
+   {
+      input = Input,
+      battlemap = Battlemap,
+      battlemap_inst = BattlemapInst,
+      main_char = MainChar,
+      main_char_inst = MainCharInst,
+      main_char_new_loc = nothing,
+      target_char = TargetChar,
+      target_char_inst = TargetCharInst
+   }.
+
+assert_main_char_can_be_used (QueryState) ->
+   false = character_instance:is_dead(QueryState#query_state.main_char_inst),
    true =
       battlemap_instance:can_play_char_instance
       (
-         BattlemapInstance,
-         Input#input.player_id,
-         Input#input.char_id
-      ),
+         QueryState#query_state.battlemap_inst,
+         QueryState#query_state.input#input.player_id,
+         QueryState#query_state.input#input.char_id
+      ).
+
+handle_main_char_movement (QueryState) ->
    {X, Y} =
       battlemap:cross
       (
-         Battlemap,
-         character_instance:get_location(CharInst),
-         character:get_movement_points(Character),
-         Input#input.path,
-         battlemap_instance:get_char_instances(BattlemapInstance)
+         QueryState#query_state.battlemap,
+         character_instance:get_location(QueryState#query_state.main_char_inst),
+         character:get_movement_points(QueryState#query_state.main_char),
+         QueryState#query_state.input#input.path,
+         battlemap_instance:get_char_instances
+         (
+            QueryState#query_state.battlemap_inst
+         )
       ),
-   NewBattlemapInstance =
-      battlemap_instance:set_char_instance
-      (
-         battlemap_instance:post_play_char_instance
+   QueryState#query_state
+   {
+      battlemap_inst =
+         battlemap_instance:set_char_instance
          (
-            BattlemapInstance,
-            Input#input.char_id
+            battlemap_instance:post_play_char_instance
+            (
+               QueryState#query_state.battlemap_inst,
+               QueryState#query_state.input#input.char_id
+            ),
+            QueryState#query_state.input#input.char_id,
+            character_instance:set_location
+            (
+               QueryState#query_state.main_char_inst,
+               X,
+               Y
+            )
          ),
-         Input#input.char_id,
-         character_instance:set_location(CharInst, X, Y)
-      ),
+      main_char_new_loc = {X, Y}
+   }.
+
+handle_target (QueryState)
+   when (QueryState#query_state.target_char_inst == nothing) ->
+   QueryState;
+handle_target (QueryState) ->
+   TargetLoc =
+      character_instance:get_location(QueryState#query_state.main_char_inst),
+   Dist =
+      battlemap:dist(QueryState#query_state.main_char_new_loc, TargetLoc),
+   true =
+      (Dist =< character:get_attack_range(QueryState#query_state.main_char)),
+   %% TODO: test for (and handle) riposte.
+   QueryState#query_state
+   {
+      battlemap_inst =
+         battlemap_instance:set_char_instance
+         (
+            QueryState#query_state.battlemap_inst,
+            QueryState#query_state.input#input.target_id,
+            character_instance:mod_health
+            (
+               QueryState#query_state.target_char_inst,
+               -1,
+               character:get_max_health(QueryState#query_state.main_char)
+            )
+         )
+   }.
+
+handle (Req) ->
+   %%%% Parse
+   Input = parse_input(Req),
+   %%%% Fetch
+   QueryState = fetch_data(Input),
+   %%%% Calc
+   assert_main_char_can_be_used(QueryState),
+   NQueryState = handle_target(handle_main_char_movement(QueryState)),
    %%%% Commit
-   database_shim:commit(battlemap_instance_db, <<"0">>, NewBattlemapInstance),
+   database_shim:commit
+   (
+      battlemap_instance_db,
+      <<"0">>,
+      NQueryState#query_state.battlemap_inst
+   ),
    %%%% Reply
    jiffy:encode([[<<"okay">>]]).