-module(gleam@function).
-compile([no_auto_import, nowarn_unused_vars]).

-export([compose/2, curry2/1, curry3/1, curry4/1, curry5/1, curry6/1, flip/1, identity/1, constant/1, tap/2, apply1/2, apply2/3, apply3/4]).

-spec compose(fun((ESO) -> ESP), fun((ESP) -> ESQ)) -> fun((ESO) -> ESQ).
compose(Fun1, Fun2) ->
    fun(A) -> Fun2(Fun1(A)) end.

-spec curry2(fun((ESR, ESS) -> EST)) -> fun((ESR) -> fun((ESS) -> EST)).
curry2(Fun) ->
    fun(A) -> fun(B) -> Fun(A, B) end end.

-spec curry3(fun((ESV, ESW, ESX) -> ESY)) -> fun((ESV) -> fun((ESW) -> fun((ESX) -> ESY))).
curry3(Fun) ->
    fun(A) -> fun(B) -> fun(C) -> Fun(A, B, C) end end end.

-spec curry4(fun((ETA, ETB, ETC, ETD) -> ETE)) -> fun((ETA) -> fun((ETB) -> fun((ETC) -> fun((ETD) -> ETE)))).
curry4(Fun) ->
    fun(A) -> fun(B) -> fun(C) -> fun(D) -> Fun(A, B, C, D) end end end end.

-spec curry5(fun((ETG, ETH, ETI, ETJ, ETK) -> ETL)) -> fun((ETG) -> fun((ETH) -> fun((ETI) -> fun((ETJ) -> fun((ETK) -> ETL))))).
curry5(Fun) ->
    fun(A) ->
        fun(B) ->
            fun(C) -> fun(D) -> fun(E) -> Fun(A, B, C, D, E) end end end
        end
    end.

-spec curry6(fun((ETN, ETO, ETP, ETQ, ETR, ETS) -> ETT)) -> fun((ETN) -> fun((ETO) -> fun((ETP) -> fun((ETQ) -> fun((ETR) -> fun((ETS) -> ETT)))))).
curry6(Fun) ->
    fun(A) ->
        fun(B) ->
            fun(C) ->
                fun(D) -> fun(E) -> fun(F) -> Fun(A, B, C, D, E, F) end end end
            end
        end
    end.

-spec flip(fun((ETV, ETW) -> ETX)) -> fun((ETW, ETV) -> ETX).
flip(Fun) ->
    fun(B, A) -> Fun(A, B) end.

-spec identity(ETY) -> ETY.
identity(X) ->
    X.

-spec constant(ETZ) -> fun((any()) -> ETZ).
constant(Value) ->
    fun(_) -> Value end.

-spec tap(EUB, fun((EUB) -> any())) -> EUB.
tap(Arg, Effect) ->
    Effect(Arg),
    Arg.

-spec apply1(fun((EUD) -> EUE), EUD) -> EUE.
apply1(Fun, Arg1) ->
    Fun(Arg1).

-spec apply2(fun((EUF, EUG) -> EUH), EUF, EUG) -> EUH.
apply2(Fun, Arg1, Arg2) ->
    Fun(Arg1, Arg2).

-spec apply3(fun((EUI, EUJ, EUK) -> EUL), EUI, EUJ, EUK) -> EUL.
apply3(Fun, Arg1, Arg2, Arg3) ->
    Fun(Arg1, Arg2, Arg3).