-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((DLU) -> DLV), fun((DLV) -> DLW)) -> fun((DLU) -> DLW).
compose(Fun1, Fun2) ->
    fun(A) -> Fun2(Fun1(A)) end.

-spec curry2(fun((DLX, DLY) -> DLZ)) -> fun((DLX) -> fun((DLY) -> DLZ)).
curry2(Fun) ->
    fun(A) -> fun(B) -> Fun(A, B) end end.

-spec curry3(fun((DMB, DMC, DMD) -> DME)) -> fun((DMB) -> fun((DMC) -> fun((DMD) -> DME))).
curry3(Fun) ->
    fun(A) -> fun(B) -> fun(C) -> Fun(A, B, C) end end end.

-spec curry4(fun((DMG, DMH, DMI, DMJ) -> DMK)) -> fun((DMG) -> fun((DMH) -> fun((DMI) -> fun((DMJ) -> DMK)))).
curry4(Fun) ->
    fun(A) -> fun(B) -> fun(C) -> fun(D) -> Fun(A, B, C, D) end end end end.

-spec curry5(fun((DMM, DMN, DMO, DMP, DMQ) -> DMR)) -> fun((DMM) -> fun((DMN) -> fun((DMO) -> fun((DMP) -> fun((DMQ) -> DMR))))).
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((DMT, DMU, DMV, DMW, DMX, DMY) -> DMZ)) -> fun((DMT) -> fun((DMU) -> fun((DMV) -> fun((DMW) -> fun((DMX) -> fun((DMY) -> DMZ)))))).
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((DNB, DNC) -> DND)) -> fun((DNC, DNB) -> DND).
flip(Fun) ->
    fun(B, A) -> Fun(A, B) end.

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

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