-module(plr_load).

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

-record
(
   input,
   {
      player_id :: shr_player:id(),
      session_token :: binary(),
      target_id :: binary()
   }
).

-record
(
   query_state,
   {
      player :: shr_player: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),
   TargetID = maps:get(<<"id">>, JSONReqMap),

   #input
   {
      player_id = PlayerID,
      session_token = SessionToken,
      target_id = TargetID
   }.

-spec authenticate_user (input()) -> ('ok' | 'error').
authenticate_user (Input) ->
   PlayerID = Input#input.player_id,
   SessionToken = Input#input.session_token,

   Player = shr_timed_cache:fetch(player_db, ataxia_security:any(), PlayerID),

   case shr_security:credentials_match(SessionToken, Player) of
      true -> ok;
      _ -> error
   end.

-spec fetch_data (input()) -> query_state().
fetch_data (Input) ->
   TargetID = Input#input.target_id,

   Player = shr_timed_cache:fetch(player_db, ataxia_security:any(), TargetID),

   #query_state
   {
      player = Player
   }.


-spec generate_reply(query_state(), input()) -> binary().
generate_reply (QueryState, Input) ->
   Player = QueryState#query_state.player,
   PlayerID = Input#input.target_id,

   Output = jiffy:encode([plr_set_player:generate(PlayerID, Player)]),

   Output.

-spec handle (binary()) -> binary().
handle (Req) ->
   Input = parse_input(Req),
   case authenticate_user(Input) of
      ok ->
         shr_security:lock_queries(Input#input.player_id),
         QueryState = fetch_data(Input),
         shr_security:unlock_queries(Input#input.player_id),
         generate_reply(QueryState, Input);

      error -> jiffy:encode([shr_disconnected:generate()])
   end.

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