-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((DNP) -> DNQ), fun((DNQ) -> DNR)) -> fun((DNP) -> DNR).
compose(Fun1, Fun2) ->
    fun(A) -> Fun2(Fun1(A)) end.

-spec curry2(fun((DNS, DNT) -> DNU)) -> fun((DNS) -> fun((DNT) -> DNU)).
curry2(Fun) ->
    fun(A) -> fun(B) -> Fun(A, B) end end.

-spec curry3(fun((DNW, DNX, DNY) -> DNZ)) -> fun((DNW) -> fun((DNX) -> fun((DNY) -> DNZ))).
curry3(Fun) ->
    fun(A) -> fun(B) -> fun(C) -> Fun(A, B, C) end end end.

-spec curry4(fun((DOB, DOC, DOD, DOE) -> DOF)) -> fun((DOB) -> fun((DOC) -> fun((DOD) -> fun((DOE) -> DOF)))).
curry4(Fun) ->
    fun(A) -> fun(B) -> fun(C) -> fun(D) -> Fun(A, B, C, D) end end end end.

-spec curry5(fun((DOH, DOI, DOJ, DOK, DOL) -> DOM)) -> fun((DOH) -> fun((DOI) -> fun((DOJ) -> fun((DOK) -> fun((DOL) -> DOM))))).
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((DOO, DOP, DOQ, DOR, DOS, DOT) -> DOU)) -> fun((DOO) -> fun((DOP) -> fun((DOQ) -> fun((DOR) -> fun((DOS) -> fun((DOT) -> DOU)))))).
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((DOW, DOX) -> DOY)) -> fun((DOX, DOW) -> DOY).
flip(Fun) ->
    fun(B, A) -> Fun(A, B) end.

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

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