-module(admin_handler_tickets).
-behaviour(cowboy_handler).
-export([init/2]).

-include("records.hrl").

init(Req, _Opts) ->
  case cowboy_req:binding(id, Req) of
    undefined -> handle_collection(Req);
    TicketId  -> handle_item(TicketId, Req)
  end.

handle_collection(Req) ->
  case cowboy_req:method(Req) of
    <<"GET">>  -> list_tickets(Req);
    <<"POST">> -> create_ticket(Req);
    _          -> send_error(Req, 405, <<"Method not allowed">>)
  end.

handle_item(TicketId, Req) ->
  case cowboy_req:method(Req) of
    <<"GET">>    -> get_ticket(TicketId, Req);
    <<"PUT">>    -> update_ticket(TicketId, Req);
    <<"DELETE">> -> delete_ticket(TicketId, Req);
    _            -> send_error(Req, 405, <<"Method not allowed">>)
  end.

list_tickets(Req) ->
  case auth_admin(Req) of
    {ok, _AdminId, Req1} ->
      Tickets = core_ticket:list_all(),   % ← было list_tickets()
      send_json(Req1, 200, [ticket_to_json(T) || T <- Tickets]);
    {error, Code, Message, Req1} ->
      send_error(Req1, Code, Message)
  end.

create_ticket(Req) ->
  case auth_admin(Req) of
    {ok, _AdminId, Req1} ->
      {ok, Body, Req2} = cowboy_req:read_body(Req1),
      try jsx:decode(Body, [return_maps]) of
        #{<<"error_message">> := _} = Data ->
          % Администратор может указать error_hash, stacktrace, context, status
          TicketData = maps:merge(#{
            <<"status">> => <<"open">>,
            <<"assigned_to">> => undefined
          }, Data),
          case core_ticket:create_ticket(TicketData) of
            {ok, Ticket} ->
              send_json(Req2, 201, ticket_to_json(Ticket));
            {error, Reason} ->
              send_error(Req2, 500, Reason)
          end;
        _ ->
          send_error(Req2, 400, <<"Missing 'error_message' field">>)
      catch
        _:_ -> send_error(Req2, 400, <<"Invalid JSON">>)
      end;
    {error, Code, Message, Req1} ->
      send_error(Req1, Code, Message)
  end.

get_ticket(TicketId, Req) ->
  case auth_admin(Req) of
    {ok, _AdminId, Req1} ->
      case core_ticket:get_by_id(TicketId) of
        {ok, Ticket} ->
          send_json(Req1, 200, ticket_to_json(Ticket));
        {error, not_found} ->
          send_error(Req1, 404, <<"Ticket not found">>)
      end;
    {error, Code, Message, Req1} ->
      send_error(Req1, Code, Message)
  end.

update_ticket(TicketId, Req) ->
  case auth_admin(Req) of
    {ok, _AdminId, Req1} ->
      {ok, Body, Req2} = cowboy_req:read_body(Req1),
      try jsx:decode(Body, [return_maps]) of
        UpdatesMap when is_map(UpdatesMap) ->
          case core_ticket:update_ticket(TicketId, UpdatesMap) of
            {ok, Ticket} ->
              send_json(Req2, 200, ticket_to_json(Ticket));
            {error, not_found} ->
              send_error(Req2, 404, <<"Ticket not found">>);
            {error, Reason} ->
              send_error(Req2, 500, Reason)
          end;
        _ ->
          send_error(Req2, 400, <<"Invalid JSON">>)
      catch
        _:_ -> send_error(Req2, 400, <<"Invalid JSON">>)
      end;
    {error, Code, Message, Req1} ->
      send_error(Req1, Code, Message)
  end.

delete_ticket(TicketId, Req) ->
  case auth_admin(Req) of
    {ok, _AdminId, Req1} ->
      case core_ticket:delete_ticket(TicketId) of
        {ok, deleted} ->
          send_json(Req1, 200, #{status => <<"deleted">>});
        {error, not_found} ->
          send_error(Req1, 404, <<"Ticket not found">>)
      end;
    {error, Code, Message, Req1} ->
      send_error(Req1, Code, Message)
  end.

auth_admin(Req) ->
  case handler_auth:authenticate(Req) of
    {ok, AdminId, Req1} ->
      case is_admin(AdminId) of
        true  -> {ok, AdminId, Req1};
        false -> {error, 403, <<"Admin access required">>, Req1}
      end;
    {error, Code, Message, Req1} ->
      {error, Code, Message, Req1}
  end.

is_admin(UserId) ->
  case core_user:get_by_id(UserId) of
    {ok, User} ->
      Role = User#user.role,
      Role =:= admin orelse Role =:= superadmin orelse
        Role =:= moderator orelse Role =:= support;
    _ -> false
  end.

ticket_to_json(T) ->
  #{
    id              => T#ticket.id,
    error_hash      => T#ticket.error_hash,
    error_message   => T#ticket.error_message,
    stacktrace      => T#ticket.stacktrace,
    context         => T#ticket.context,
    count           => T#ticket.count,
    first_seen      => datetime_to_iso8601(T#ticket.first_seen),
    last_seen       => datetime_to_iso8601(T#ticket.last_seen),
    status          => T#ticket.status,
    assigned_to     => T#ticket.assigned_to,
    resolution_note => T#ticket.resolution_note
  }.

datetime_to_iso8601({{Year, Month, Day}, {Hour, Minute, Second}}) ->
  iolist_to_binary(io_lib:format("~4..0B-~2..0B-~2..0BT~2..0B:~2..0B:~2..0BZ",
    [Year, Month, Day, Hour, Minute, Second]));
datetime_to_iso8601(undefined) -> undefined.

send_json(Req, Status, Data) ->
  Body = jsx:encode(Data),
  cowboy_req:reply(Status, #{<<"content-type">> => <<"application/json">>}, Body, Req),
  {ok, Body, []}.

send_error(Req, Status, Message) ->
  Body = jsx:encode(#{error => Message}),
  cowboy_req:reply(Status, #{<<"content-type">> => <<"application/json">>}, Body, Req),
  {ok, Body, []}.