-module(clip).
-compile([no_auto_import, nowarn_unused_vars, nowarn_unused_function, nowarn_nomatch]).

-export([pure/1, apply/2, command/1, fail/1, opt/2, arg/2, arg_many/2, arg_many1/2, flag/2, subcommands_with_default/2, subcommands/1, add_help/3, run/2]).
-export_type([command/1]).

-opaque command(IRJ) :: {command,
        clip@internal@arg_info:arg_info(),
        fun((list(binary())) -> {ok, {IRJ, list(binary())}} | {error, binary()})}.

-spec pure(IRK) -> command(IRK).
pure(Val) ->
    {command,
        clip@internal@arg_info:empty(),
        fun(Args) -> {ok, {Val, Args}} end}.

-spec apply(command(fun((IRM) -> IRN)), command(IRM)) -> command(IRN).
apply(Mf, Ma) ->
    {command,
        clip@internal@arg_info:merge(
            erlang:element(2, Mf),
            erlang:element(2, Ma)
        ),
        fun(Args) ->
            gleam@result:'try'(
                (erlang:element(3, Mf))(Args),
                fun(_use0) ->
                    {F, Args1} = _use0,
                    gleam@result:'try'(
                        (erlang:element(3, Ma))(Args1),
                        fun(_use0@1) ->
                            {A, Args2} = _use0@1,
                            {ok, {F(A), Args2}}
                        end
                    )
                end
            )
        end}.

-spec command(fun((IRR) -> IRS)) -> command(fun((IRR) -> IRS)).
command(F) ->
    pure(F).

-spec fail(binary()) -> command(any()).
fail(Message) ->
    {command, clip@internal@arg_info:empty(), fun(_) -> {error, Message} end}.

-spec opt(command(fun((IRW) -> IRX)), clip@opt:opt(IRW)) -> command(IRX).
opt(Command, Opt) ->
    apply(
        Command,
        {command,
            clip@opt:to_arg_info(Opt),
            fun(_capture) -> clip@opt:run(Opt, _capture) end}
    ).

-spec arg(command(fun((ISB) -> ISC)), clip@arg:arg(ISB)) -> command(ISC).
arg(Command, Arg) ->
    apply(
        Command,
        {command,
            clip@arg:to_arg_info(Arg),
            fun(_capture) -> clip@arg:run(Arg, _capture) end}
    ).

-spec arg_many(command(fun((list(ISG)) -> ISI)), clip@arg:arg(ISG)) -> command(ISI).
arg_many(Command, Arg) ->
    apply(
        Command,
        {command,
            clip@arg:to_arg_info_many(Arg),
            fun(_capture) -> clip@arg:run_many(Arg, _capture) end}
    ).

-spec arg_many1(command(fun((list(ISM)) -> ISO)), clip@arg:arg(ISM)) -> command(ISO).
arg_many1(Command, Arg) ->
    apply(
        Command,
        {command,
            clip@arg:to_arg_info_many1(Arg),
            fun(_capture) -> clip@arg:run_many1(Arg, _capture) end}
    ).

-spec flag(command(fun((boolean()) -> ISS)), clip@flag:flag()) -> command(ISS).
flag(Command, Flag) ->
    apply(
        Command,
        {command,
            clip@flag:to_arg_info(Flag),
            fun(_capture) -> clip@flag:run(Flag, _capture) end}
    ).

-spec run_subcommands(
    list({binary(), command(ISV)}),
    command(ISV),
    list(binary())
) -> {ok, {ISV, list(binary())}} | {error, binary()}.
run_subcommands(Subcommands, Default, Args) ->
    case {Subcommands, Args} of
        {[{Name, Command} | _], [Head | Rest]} when Name =:= Head ->
            (erlang:element(3, Command))(Rest);

        {[_ | Rest@1], _} ->
            run_subcommands(Rest@1, Default, Args);

        {[], _} ->
            (erlang:element(3, Default))(Args)
    end.

-spec subcommands_with_default(list({binary(), command(ITA)}), command(ITA)) -> command(ITA).
subcommands_with_default(Subcommands, Default) ->
    Sub_names = gleam@list:map(Subcommands, fun(P) -> erlang:element(1, P) end),
    Sub_arg_info = erlang:setelement(5, erlang:element(2, Default), Sub_names),
    apply(
        pure(fun(A) -> A end),
        {command,
            Sub_arg_info,
            fun(_capture) -> run_subcommands(Subcommands, Default, _capture) end}
    ).

-spec subcommands(list({binary(), command(ITF)})) -> command(ITF).
subcommands(Subcommands) ->
    subcommands_with_default(
        Subcommands,
        fail(<<"No subcommand provided"/utf8>>)
    ).

-spec add_help(command(ITJ), binary(), binary()) -> command(ITJ).
add_help(Command, Name, Description) ->
    Help_info = erlang:setelement(
        4,
        clip@internal@arg_info:empty(),
        [{flag_info,
                <<"help"/utf8>>,
                {some, <<"h"/utf8>>},
                {some, <<"Print this help"/utf8>>}}]
    ),
    erlang:setelement(3, Command, fun(Args) -> case Args of
                [<<"-h"/utf8>> | _] ->
                    {error,
                        clip@internal@arg_info:help_text(
                            clip@internal@arg_info:merge(
                                erlang:element(2, Command),
                                Help_info
                            ),
                            Name,
                            Description
                        )};

                [<<"--help"/utf8>> | _] ->
                    {error,
                        clip@internal@arg_info:help_text(
                            clip@internal@arg_info:merge(
                                erlang:element(2, Command),
                                Help_info
                            ),
                            Name,
                            Description
                        )};

                Other ->
                    (erlang:element(3, Command))(Other)
            end end).

-spec run(command(ITM), list(binary())) -> {ok, ITM} | {error, binary()}.
run(Command, Args) ->
    case (erlang:element(3, Command))(Args) of
        {ok, {A, _}} ->
            {ok, A};

        {error, E} ->
            {error, E}
    end.