-module(admin_handler_reviews_by_id).
-behaviour(cowboy_handler).

-export([init/2]).
-export([trails/0]).

-include("records.hrl").

%%% cowboy_handler callback
init(Req, _Opts) ->
  case cowboy_req:method(Req) of
    <<"GET">> -> get_review(Req);
    <<"PUT">> -> update_review(Req);
    _         -> handler_utils:send_error(Req, 405, <<"Method not allowed">>)
  end.

%%% Swagger metadata
trails() ->
  BaseParams = [#{
    name        => <<"id">>,
    in          => <<"path">>,
    description => <<"Review ID">>,
    required    => true,
    schema      => #{type => string}
  }],
  [
    #{  % GET by id
      path        => <<"/v1/admin/reviews/:id">>,
      method      => <<"GET">>,
      description => <<"Get review by ID (admin)">>,
      tags        => [<<"Reviews">>],
      parameters  => BaseParams,
      responses   => #{
        200 => #{
          description => <<"Review details">>,
          content     => #{<<"application/json">> => #{schema => review_schema()}}
        }
      }
    },
    #{  % PUT update
      path        => <<"/v1/admin/reviews/:id">>,
      method      => <<"PUT">>,
      description => <<"Update review (admin)">>,
      tags        => [<<"Reviews">>],
      parameters  => BaseParams,
      requestBody => #{
        required => true,
        content  => #{<<"application/json">> => #{schema => review_update_schema()}}
      },
      responses => #{
        200 => #{description => <<"Updated review">>}
      }
    }
  ].

review_schema() ->
  #{
    type       => object,
    properties => #{
      id          => #{type => string},
      user_id     => #{type => string},
      target_type => #{type => string, enum => [<<"calendar">>, <<"event">>]},
      target_id   => #{type => string},
      rating      => #{type => integer, minimum => 1, maximum => 5},
      comment     => #{type => string},
      status      => #{type => string, enum => [<<"visible">>, <<"hidden">>, <<"deleted">>]},
      reason      => #{type => string, nullable => true},
      likes       => #{type => integer},
      dislikes    => #{type => integer},
      created_at  => #{type => string, format => <<"date-time">>},
      updated_at  => #{type => string, format => <<"date-time">>}
    }
  }.

review_update_schema() ->
  #{
    type       => object,
    properties => #{
      status  => #{type => string, enum => [<<"visible">>, <<"hidden">>, <<"deleted">>]},
      reason  => #{type => string},
      comment => #{type => string},
      rating  => #{type => integer, minimum => 1, maximum => 5}
    }
  }.

%%% Internal functions

get_review(Req) ->
  case handler_utils:auth_admin(Req) of
    {ok, _AdminId, Req1} ->
      ReviewId = cowboy_req:binding(id, Req1),
      case logic_review:get_review_admin(ReviewId) of
        {ok, Review} ->
          handler_utils:send_json(Req1, 200, handler_utils:review_to_json(Review));
        {error, not_found} ->
          handler_utils:send_error(Req1, 404, <<"Review not found">>);
        {error, _} ->
          handler_utils:send_error(Req1, 500, <<"Internal server error">>)
      end;
    {error, Code, Msg, Req1} ->
      handler_utils:send_error(Req1, Code, Msg)
  end.

update_review(Req) ->
  case handler_utils:auth_admin(Req) of
    {ok, _AdminId, Req1} ->
      ReviewId = cowboy_req:binding(id, Req1),
      {ok, Body, Req2} = cowboy_req:read_body(Req1),
      try jsx:decode(Body, [return_maps]) of
        UpdatesMap when is_map(UpdatesMap) ->
          Updates = maps:to_list(UpdatesMap),
          case logic_review:update_review_admin(ReviewId, Updates) of
            {ok, Review} ->
              handler_utils:send_json(Req2, 200, handler_utils:review_to_json(Review));
            {error, not_found} ->
              handler_utils:send_error(Req2, 404, <<"Review not found">>);
            {error, _} ->
              handler_utils:send_error(Req2, 500, <<"Internal server error">>)
          end;
        _ ->
          handler_utils:send_error(Req2, 400, <<"Invalid JSON">>)
      catch
        _:_ -> handler_utils:send_error(Req1, 400, <<"Invalid JSON format">>)
      end;
    {error, Code, Msg, Req1} ->
      handler_utils:send_error(Req1, Code, Msg)
  end.