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

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

-spec compose(fun((GE) -> GF), fun((GF) -> GG)) -> fun((GE) -> GG).
compose(Fun1, Fun2) ->
    fun(A) -> Fun2(Fun1(A)) end.

-spec curry2(fun((GH, GI) -> GJ)) -> fun((GH) -> fun((GI) -> GJ)).
curry2(Fun) ->
    fun(A) -> fun(B) -> Fun(A, B) end end.

-spec curry3(fun((GL, GM, GN) -> GO)) -> fun((GL) -> fun((GM) -> fun((GN) -> GO))).
curry3(Fun) ->
    fun(A) -> fun(B) -> fun(C) -> Fun(A, B, C) end end end.

-spec curry4(fun((GQ, GR, GS, GT) -> GU)) -> fun((GQ) -> fun((GR) -> fun((GS) -> fun((GT) -> GU)))).
curry4(Fun) ->
    fun(A) -> fun(B) -> fun(C) -> fun(D) -> Fun(A, B, C, D) end end end end.

-spec curry5(fun((GW, GX, GY, GZ, HA) -> HB)) -> fun((GW) -> fun((GX) -> fun((GY) -> fun((GZ) -> fun((HA) -> HB))))).
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((HD, HE, HF, HG, HH, HI) -> HJ)) -> fun((HD) -> fun((HE) -> fun((HF) -> fun((HG) -> fun((HH) -> fun((HI) -> HJ)))))).
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((HL, HM) -> HN)) -> fun((HM, HL) -> HN).
flip(Fun) ->
    fun(B, A) -> Fun(A, B) end.

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