-module(sunny@api@geocoding).
-compile([no_auto_import, nowarn_unused_vars, nowarn_unused_function, nowarn_nomatch]).

-export([location_to_position/1, params/1, set_count/2, set_language/2, get_locations/2, get_first_location/2]).
-export_type([language/0, location/0, geocoding_params/0, location_list/0]).

-type language() :: english |
    german |
    french |
    spanish |
    italian |
    portuguese |
    russian |
    turkish |
    hindi.

-type location() :: {location,
        float(),
        float(),
        integer(),
        binary(),
        float(),
        binary(),
        binary(),
        integer(),
        gleam@option:option(integer()),
        gleam@option:option(list(binary())),
        gleam@option:option(binary()),
        gleam@option:option(binary()),
        gleam@option:option(binary()),
        gleam@option:option(binary()),
        gleam@option:option(integer()),
        gleam@option:option(integer()),
        gleam@option:option(integer()),
        gleam@option:option(integer())}.

-type geocoding_params() :: {geocoding_params, binary(), integer(), language()}.

-type location_list() :: {location_list, gleam@option:option(list(location()))}.

-spec location_to_position(location()) -> sunny@position:position().
location_to_position(Location) ->
    {position, erlang:element(2, Location), erlang:element(3, Location)}.

-spec params(binary()) -> geocoding_params().
params(Name) ->
    {geocoding_params, Name, 10, english}.

-spec set_count(geocoding_params(), integer()) -> geocoding_params().
set_count(Params, Count) ->
    erlang:setelement(3, Params, gleam@int:clamp(Count, 1, 100)).

-spec set_language(geocoding_params(), language()) -> geocoding_params().
set_language(Params, Language) ->
    erlang:setelement(4, Params, Language).

-spec language_to_country_code(language()) -> binary().
language_to_country_code(Lang) ->
    case Lang of
        english ->
            <<"en"/utf8>>;

        german ->
            <<"de"/utf8>>;

        french ->
            <<"fr"/utf8>>;

        spanish ->
            <<"es"/utf8>>;

        italian ->
            <<"it"/utf8>>;

        portuguese ->
            <<"pt"/utf8>>;

        russian ->
            <<"ru"/utf8>>;

        turkish ->
            <<"tr"/utf8>>;

        hindi ->
            <<"hi"/utf8>>
    end.

-spec geocoding_params_to_params_list(geocoding_params()) -> list(sunny@internal@utils:request_parameter()).
geocoding_params_to_params_list(Params) ->
    [{request_parameter, <<"name"/utf8>>, erlang:element(2, Params)},
        {request_parameter,
            <<"count"/utf8>>,
            gleam@int:to_string(erlang:element(3, Params))},
        {request_parameter,
            <<"language"/utf8>>,
            begin
                _pipe = erlang:element(4, Params),
                language_to_country_code(_pipe)
            end},
        {request_parameter, <<"format"/utf8>>, <<"json"/utf8>>}].

-spec locations_from_json(binary()) -> {ok, list(location())} |
    {error, sunny@errors:sunny_error()}.
locations_from_json(Json_string) ->
    Geocoding_decoder = gleam@dynamic:decode1(
        fun(Field@0) -> {location_list, Field@0} end,
        gleam@dynamic:optional_field(
            <<"results"/utf8>>,
            gleam@dynamic:list(
                sunny@internal@utils:decode18(
                    fun(Field@0, Field@1, Field@2, Field@3, Field@4, Field@5, Field@6, Field@7, Field@8, Field@9, Field@10, Field@11, Field@12, Field@13, Field@14, Field@15, Field@16, Field@17) -> {location, Field@0, Field@1, Field@2, Field@3, Field@4, Field@5, Field@6, Field@7, Field@8, Field@9, Field@10, Field@11, Field@12, Field@13, Field@14, Field@15, Field@16, Field@17} end,
                    gleam@dynamic:field(
                        <<"latitude"/utf8>>,
                        fun gleam@dynamic:float/1
                    ),
                    gleam@dynamic:field(
                        <<"longitude"/utf8>>,
                        fun gleam@dynamic:float/1
                    ),
                    gleam@dynamic:field(<<"id"/utf8>>, fun gleam@dynamic:int/1),
                    gleam@dynamic:field(
                        <<"name"/utf8>>,
                        fun gleam@dynamic:string/1
                    ),
                    gleam@dynamic:field(
                        <<"elevation"/utf8>>,
                        fun gleam@dynamic:float/1
                    ),
                    gleam@dynamic:field(
                        <<"feature_code"/utf8>>,
                        fun gleam@dynamic:string/1
                    ),
                    gleam@dynamic:field(
                        <<"country_code"/utf8>>,
                        fun gleam@dynamic:string/1
                    ),
                    gleam@dynamic:field(
                        <<"country_id"/utf8>>,
                        fun gleam@dynamic:int/1
                    ),
                    gleam@dynamic:optional_field(
                        <<"population"/utf8>>,
                        fun gleam@dynamic:int/1
                    ),
                    gleam@dynamic:optional_field(
                        <<"postcodes"/utf8>>,
                        gleam@dynamic:list(fun gleam@dynamic:string/1)
                    ),
                    gleam@dynamic:optional_field(
                        <<"admin1"/utf8>>,
                        fun gleam@dynamic:string/1
                    ),
                    gleam@dynamic:optional_field(
                        <<"admin2"/utf8>>,
                        fun gleam@dynamic:string/1
                    ),
                    gleam@dynamic:optional_field(
                        <<"admin3"/utf8>>,
                        fun gleam@dynamic:string/1
                    ),
                    gleam@dynamic:optional_field(
                        <<"admin4"/utf8>>,
                        fun gleam@dynamic:string/1
                    ),
                    gleam@dynamic:optional_field(
                        <<"admin1_id"/utf8>>,
                        fun gleam@dynamic:int/1
                    ),
                    gleam@dynamic:optional_field(
                        <<"admin2_id"/utf8>>,
                        fun gleam@dynamic:int/1
                    ),
                    gleam@dynamic:optional_field(
                        <<"admin3_id"/utf8>>,
                        fun gleam@dynamic:int/1
                    ),
                    gleam@dynamic:optional_field(
                        <<"admin4_id"/utf8>>,
                        fun gleam@dynamic:int/1
                    )
                )
            )
        )
    ),
    _pipe = gleam@json:decode(Json_string, Geocoding_decoder),
    _pipe@1 = gleam@result:map_error(_pipe, fun(X) -> {decode_error, X} end),
    _pipe@2 = gleam@result:map(
        _pipe@1,
        fun(Locations_maybe) -> case Locations_maybe of
                {location_list, {some, Locations}} ->
                    {ok, Locations};

                _ ->
                    {error,
                        {api_error,
                            {no_results_error,
                                <<"Geocoding search gave no results"/utf8>>}}}
            end end
    ),
    gleam@result:flatten(_pipe@2).

-spec make_request(sunny@internal@client:client(), geocoding_params()) -> {ok,
        list(location())} |
    {error, sunny@errors:sunny_error()}.
make_request(Client, Params) ->
    Params@1 = case erlang:element(3, Params) of
        C when (C > 100) orelse (C < 1) ->
            set_count(Params, C);

        _ ->
            Params
    end,
    case begin
        _pipe@1 = sunny@internal@utils:get_final_url(
            erlang:element(2, Client),
            <<"geocoding"/utf8>>,
            erlang:element(3, Client),
            <<"/search"/utf8>>,
            erlang:element(4, Client),
            begin
                _pipe = Params@1,
                geocoding_params_to_params_list(_pipe)
            end
        ),
        sunny@internal@utils:make_request(_pipe@1)
    end of
        {ok, Body} ->
            locations_from_json(Body);

        {error, Err} ->
            {error, {http_error, Err}}
    end.

-spec get_locations(sunny@internal@client:client(), geocoding_params()) -> {ok,
        list(location())} |
    {error, sunny@errors:sunny_error()}.
get_locations(Client, Params) ->
    make_request(Client, Params).

-spec get_first_location(sunny@internal@client:client(), geocoding_params()) -> {ok,
        location()} |
    {error, sunny@errors:sunny_error()}.
get_first_location(Client, Params) ->
    gleam@result:'try'(
        get_locations(Client, set_count(Params, 1)),
        fun(Locations) -> case Locations of
                [Head | _] ->
                    {ok, Head};

                [] ->
                    {error,
                        {sunny_internal_error,
                            {internal_error,
                                <<"`get_locations` gave empty list instead of error."/utf8>>}}}
            end end
    ).

-spec decoding_helper(
    gleam@dict:dict(integer(), NBQ),
    integer(),
    list(NBQ),
    integer()
) -> list(NBQ).
decoding_helper(D, N, L, Max) ->
    case N of
        N@1 when N@1 >= Max ->
            L;

        N@2 ->
            L@1 = lists:append(L, [case gleam@dict:get(D, N@2) of
                        {ok, V} ->
                            V;

                        {error, _} ->
                            erlang:error(#{gleam_error => panic,
                                    message => <<"This shouldn't happen."/utf8>>,
                                    module => <<"sunny/api/geocoding"/utf8>>,
                                    function => <<"decoding_helper"/utf8>>,
                                    line => 265})
                    end]),
            decoding_helper(D, N@2 + 1, L@1, Max)
    end.