-module(map_load).

%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%% TYPES %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
-include("../../../include/yaws_api.hrl").

-record
(
   input,
   {
      player_id :: binary(),
      session_token :: binary(),
      map_id :: binary()
   }
).

-record
(
   query_state,
   {
      map :: map_map:type()
   }
).

-type input() :: #input{}.
-type query_state() :: #query_state{}.

%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%% EXPORTS %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
-export([out/1]).

%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%% LOCAL FUNCTIONS %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
-spec parse_input (binary()) -> input().
parse_input (Req) ->
   JSONReqMap = jiffy:decode(Req, [return_maps]),
   PlayerID = maps:get(<<"pid">>, JSONReqMap),
   SessionToken =  maps:get(<<"stk">>, JSONReqMap),
   MapID = maps:get(<<"mid">>, JSONReqMap),

   #input
   {
      player_id = PlayerID,
      session_token = SessionToken,
      map_id = MapID
   }.

-spec fetch_data (input()) -> query_state().
fetch_data (Input) ->
   PlayerID = Input#input.player_id,
   MapID = Input#input.map_id,

   Map = shr_timed_cache:fetch(map_db, PlayerID, MapID),

   #query_state
   {
      map = Map
   }.

-spec generate_reply(query_state()) -> binary().
generate_reply (QueryState) ->
   Map = QueryState#query_state.map,

   SetMap = map_set_map:generate(Map),
   Output = jiffy:encode(SetMap),

   Output.

-spec handle (binary()) -> binary().
handle (Req) ->
   Input = parse_input(Req),
   shr_security:assert_identity
   (
      Input#input.player_id,
      Input#input.session_token
   ),
   shr_security:lock_queries(Input#input.player_id),
   QueryState = fetch_data(Input),
   shr_security:unlock_queries(Input#input.player_id),
   generate_reply(QueryState).

%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%% EXPORTED FUNCTIONS %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
out(A) ->
   {
      content,
      "application/json; charset=UTF-8",
      handle(A#arg.clidata)
   }.