%%%-------------------------------------------------------------------
%%% @doc Обработчик подтверждения email.
%%% POST /v1/verify – активирует аккаунт по верификационному токену.
%%% @end
%%%-------------------------------------------------------------------
-module(handler_verify).
-behaviour(cowboy_handler).
-export([init/2]).
-export([trails/0]).

%%% cowboy_handler callback
init(Req, _Opts) ->
  case cowboy_req:method(Req) of
    <<"POST">> ->
      {ok, Body, Req1} = cowboy_req:read_body(Req),
      try jsx:decode(Body, [return_maps]) of
        #{<<"token">> := Token} ->
          case core_verification:verify_token(Token) of
            {ok, UserId} ->
              core_user:update(UserId, [{status, active}]),
              core_verification:delete_token(Token),
              handler_utils:send_json(Req1, 200, #{<<"message">> => <<"Account verified">>});
            {error, expired} ->
              handler_utils:send_error(Req1, 410, <<"Token expired">>);
            {error, not_found} ->
              handler_utils:send_error(Req1, 404, <<"Token not found">>)
          end;
        _ ->
          handler_utils:send_error(Req1, 400, <<"Missing token">>)
      catch
        _:_ -> handler_utils:send_error(Req1, 400, <<"Invalid JSON">>)
      end;
    _ ->
      handler_utils:send_error(Req, 405, <<"Method not allowed">>)
  end.

%%% Swagger metadata
-spec trails() -> [map()].
trails() ->
  [
    #{
      path => <<"/v1/verify">>,
      method => <<"POST">>,
      description => <<"Verify user account using email verification token">>,
      tags => [<<"Auth">>],
      requestBody => #{
        required => true,
        content => #{
          <<"application/json">> => #{
            schema => #{
              type => object,
              required => [<<"token">>],
              properties => #{
                token => #{type => string, description => <<"Verification token received by email">>}
              }
            }
          }
        }
      },
      responses => #{
        200 => #{description => <<"Account verified successfully">>},
        400 => #{description => <<"Missing token field or invalid JSON">>},
        404 => #{description => <<"Token not found">>},
        410 => #{description => <<"Token expired">>}
      }
    }
  ].