-module(startest@expect).
-compile([no_auto_import, nowarn_unused_vars, nowarn_unused_function, nowarn_nomatch]).

-export([to_equal/2, to_not_equal/2, to_be_true/1, to_be_false/1, to_be_ok/1, to_be_error/1, to_be_some/1, to_be_none/1, to_throw/1, to_not_throw/1, to_loosely_equal/3]).

-spec to_equal(SFS, SFS) -> nil.
to_equal(Actual, Expected) ->
    case Actual =:= Expected of
        true ->
            nil;

        false ->
            _pipe = {assertion_error,
                gleam@string:concat(
                    [<<"Expected "/utf8>>,
                        gleam@string:inspect(Actual),
                        <<" to equal "/utf8>>,
                        gleam@string:inspect(Expected)]
                ),
                gleam@string:inspect(Actual),
                gleam@string:inspect(Expected)},
            startest@assertion_error:raise(_pipe)
    end.

-spec to_not_equal(SFT, SFT) -> nil.
to_not_equal(Actual, Expected) ->
    case Actual /= Expected of
        true ->
            nil;

        false ->
            _pipe = {assertion_error,
                gleam@string:concat(
                    [<<"Expected "/utf8>>,
                        gleam@string:inspect(Actual),
                        <<" to not equal "/utf8>>,
                        gleam@string:inspect(Expected)]
                ),
                gleam@string:inspect(Actual),
                gleam@string:inspect(Expected)},
            startest@assertion_error:raise(_pipe)
    end.

-spec to_be_true(boolean()) -> nil.
to_be_true(Actual) ->
    _pipe = Actual,
    to_equal(_pipe, true).

-spec to_be_false(boolean()) -> nil.
to_be_false(Actual) ->
    _pipe = Actual,
    to_equal(_pipe, false).

-spec to_be_ok({ok, SFU} | {error, any()}) -> SFU.
to_be_ok(Actual) ->
    case Actual of
        {ok, Value} ->
            Value;

        {error, _} ->
            _pipe = {assertion_error,
                gleam@string:concat(
                    [<<"Expected "/utf8>>,
                        gleam@string:inspect(Actual),
                        <<" to be Ok"/utf8>>]
                ),
                gleam@string:inspect(Actual),
                <<"Ok(_)"/utf8>>},
            startest@assertion_error:raise(_pipe)
    end.

-spec to_be_error({ok, any()} | {error, SFZ}) -> SFZ.
to_be_error(Actual) ->
    case Actual of
        {error, Error} ->
            Error;

        {ok, _} ->
            _pipe = {assertion_error,
                gleam@string:concat(
                    [<<"Expected "/utf8>>,
                        gleam@string:inspect(Actual),
                        <<" to be Error"/utf8>>]
                ),
                gleam@string:inspect(Actual),
                <<"Error(_)"/utf8>>},
            startest@assertion_error:raise(_pipe)
    end.

-spec to_be_some(gleam@option:option(SGC)) -> SGC.
to_be_some(Actual) ->
    case Actual of
        {some, Value} ->
            Value;

        none ->
            _pipe = {assertion_error,
                gleam@string:concat(
                    [<<"Expected "/utf8>>,
                        gleam@string:inspect(Actual),
                        <<" to be Some"/utf8>>]
                ),
                gleam@string:inspect(Actual),
                <<"Some(_)"/utf8>>},
            startest@assertion_error:raise(_pipe)
    end.

-spec to_be_none(gleam@option:option(any())) -> nil.
to_be_none(Actual) ->
    case Actual of
        none ->
            nil;

        {some, _} ->
            _pipe = {assertion_error,
                gleam@string:concat(
                    [<<"Expected "/utf8>>,
                        gleam@string:inspect(Actual),
                        <<" to be None"/utf8>>]
                ),
                gleam@string:inspect(Actual),
                <<"None"/utf8>>},
            startest@assertion_error:raise(_pipe)
    end.

-spec to_throw(fun(() -> any())) -> nil.
to_throw(F) ->
    case exception_ffi:rescue(F) of
        {error, _} ->
            nil;

        {ok, Value} ->
            _pipe = {assertion_error,
                gleam@string:concat(
                    [<<"Expected "/utf8>>,
                        gleam@string:inspect(F),
                        <<" to throw an error"/utf8>>]
                ),
                gleam@string:inspect(Value),
                gleam@string:inspect(nil)},
            startest@assertion_error:raise(_pipe)
    end.

-spec to_not_throw(fun(() -> SGH)) -> SGH.
to_not_throw(F) ->
    case exception_ffi:rescue(F) of
        {ok, Value} ->
            Value;

        {error, Exception} ->
            _pipe = {assertion_error,
                gleam@string:concat(
                    [<<"Expected "/utf8>>,
                        gleam@string:inspect(F),
                        <<" to not throw an error"/utf8>>]
                ),
                gleam@string:inspect(nil),
                gleam@string:inspect(Exception)},
            startest@assertion_error:raise(_pipe)
    end.

-spec format_float(float()) -> binary().
format_float(Value) ->
    Repr = gleam@float:to_string(Value),
    case gleam_stdlib:contains_string(Repr, <<"."/utf8>>) of
        true ->
            Repr;

        false ->
            <<Repr/binary, ".0"/utf8>>
    end.

-spec to_loosely_equal(float(), float(), float()) -> nil.
to_loosely_equal(Actual, Expected, Tolerance) ->
    case gleam@float:loosely_equals(Actual, Expected, Tolerance) of
        true ->
            nil;

        false ->
            _pipe = {assertion_error,
                gleam@string:concat(
                    [<<"Expected "/utf8>>,
                        format_float(Actual),
                        <<" to loosely equal "/utf8>>,
                        format_float(Expected),
                        <<" with a tolerance of "/utf8>>,
                        format_float(Tolerance)]
                ),
                format_float(Actual),
                <<<<(format_float(Expected))/binary, " ± "/utf8>>/binary,
                    (format_float(Tolerance))/binary>>},
            startest@assertion_error:raise(_pipe)
    end.