-module(gleam@function).
-compile(no_auto_import).

-export([compose/2, curry2/1, curry3/1, curry4/1, curry5/1, curry6/1, flip/1, identity/1, constant/1]).

-spec compose(fun((DMO) -> DMP), fun((DMP) -> DMQ)) -> fun((DMO) -> DMQ).
compose(Fun1, Fun2) ->
    fun(A) -> Fun2(Fun1(A)) end.

-spec curry2(fun((DMR, DMS) -> DMT)) -> fun((DMR) -> fun((DMS) -> DMT)).
curry2(Fun) ->
    fun(A) -> fun(B) -> Fun(A, B) end end.

-spec curry3(fun((DMV, DMW, DMX) -> DMY)) -> fun((DMV) -> fun((DMW) -> fun((DMX) -> DMY))).
curry3(Fun) ->
    fun(A) -> fun(B) -> fun(C) -> Fun(A, B, C) end end end.

-spec curry4(fun((DNA, DNB, DNC, DND) -> DNE)) -> fun((DNA) -> fun((DNB) -> fun((DNC) -> fun((DND) -> DNE)))).
curry4(Fun) ->
    fun(A) -> fun(B) -> fun(C) -> fun(D) -> Fun(A, B, C, D) end end end end.

-spec curry5(fun((DNG, DNH, DNI, DNJ, DNK) -> DNL)) -> fun((DNG) -> fun((DNH) -> fun((DNI) -> fun((DNJ) -> fun((DNK) -> DNL))))).
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((DNN, DNO, DNP, DNQ, DNR, DNS) -> DNT)) -> fun((DNN) -> fun((DNO) -> fun((DNP) -> fun((DNQ) -> fun((DNR) -> fun((DNS) -> DNT)))))).
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((DNV, DNW) -> DNX)) -> fun((DNW, DNV) -> DNX).
flip(Fun) ->
    fun(B, A) -> Fun(A, B) end.

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

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