# This file is a part of Julia. License is MIT: https://julialang.org/license

@test convert(Tuple, (1,2)) == (1,2)
@testset "indexing" begin
    @test length(()) == 0
    @test length((1,)) === 1
    @test length((1,2)) === 2

    @test_throws ArgumentError Base.front(())
    @test_throws ArgumentError first(())

    @test endof(()) === 0
    @test endof((1,)) === 1
    @test endof((1,2)) === 2

    @test size((), 1) === 0
    @test size((1,), 1) === 1
    @test size((1,2), 1) === 2
end
# @test_throws ArgumentError size((), 2)
# @test_throws ArgumentError size((1,), 2)
# @test_throws ArgumentError size((1,2), 2)

@test getindex((1,), 1) === 1
@test getindex((1,2), 2) === 2
@test_throws BoundsError getindex((), 1)
@test_throws BoundsError getindex((1,2), 0)
@test_throws BoundsError getindex((1,2), -1)

@test getindex((1,), 1.0) === 1
@test getindex((1,2), 2.0) === 2
@test_throws BoundsError getindex((), 1.0)
@test_throws BoundsError getindex((1,2), 0.0)
@test_throws BoundsError getindex((1,2), -1.0)

@test getindex((5,6,7,8), [1,2,3]) === (5,6,7)
@test_throws BoundsError getindex((1,2), [3,4])

@test getindex((5,6,7,8), [true, false, false, true]) === (5,8)
@test_throws BoundsError getindex((5,6,7,8), [true, false, false, true, true])

@test getindex((5,6,7,8), []) === ()

## filling to specified length
@test @inferred(Base.fill_to_length((1,2,3), -1, Val{5})) == (1,2,3,-1,-1)
@test_throws ArgumentError Base.fill_to_length((1,2,3), -1, Val{2})

## iterating ##
@test start((1,2,3)) === 1

@test done((), 1)
@test !done((1,2,3), 3)
@test done((1,2,3), 4)

@test next((5,6,7), 1) === (5, 2)
@test next((5,6,7), 3) === (7, 4)
@test_throws BoundsError next((5,6,7), 0)
@test_throws BoundsError next((), 1)

@test collect(eachindex((2,5,"foo"))) == collect(1:3)
@test collect(eachindex((2,5,"foo"), (1,2,5,7))) == collect(1:4)


## eltype ##
@test eltype((1,2,3)) === Int
@test eltype((1.0,2.0,3.0)) <: AbstractFloat
@test eltype((true, false)) === Bool
@test eltype((1, 2.0, false)) === typejoin(Int, Float64, Bool)
@test eltype(()) === Union{}
@test eltype(Tuple{Int, Float64, Vararg{Bool}}) === typejoin(Int, Float64, Bool)
@test eltype(Tuple{Int, T, Vararg{Bool}} where T <: AbstractFloat) ===
    typejoin(Int, AbstractFloat, Bool)
@test eltype(Tuple{Int, Bool, Vararg{T}} where T <: AbstractFloat) ===
    typejoin(Int, AbstractFloat, Bool)
@test eltype(Union{Tuple{Int, Float64}, Tuple{Vararg{Bool}}}) === typejoin(Int, Float64, Bool)

begin
    local foo
    ## mapping ##
    foo() = 2
    foo(x) = 2x
    foo(x, y) = x + y
    foo(x, y, z) = x + y + z
    longtuple = ntuple(identity, 20)

    # 1 argument
    @test map(foo, ()) === ()
    @test map(foo, (1,)) === (2,)
    @test map(foo, (1,2)) === (2,4)
    @test map(foo, (1,2,3,4)) === (2,4,6,8)
    @test map(foo, longtuple) === ntuple(i->2i,20)

    # 2 arguments
    @test map(foo, (), ()) === ()
    @test map(foo, (1,), (1,)) === (2,)
    @test map(foo, (1,2), (1,2)) === (2,4)
    @test map(foo, (1,2,3,4), (1,2,3,4)) === (2,4,6,8)
    @test map(foo, longtuple, longtuple) === ntuple(i->2i,20)
    @test_throws BoundsError map(foo, (), (1,))
    @test_throws BoundsError map(foo, (1,), ())

    # n arguments
    @test map(foo, (), (), ()) === ()
    @test map(foo, (1,), (1,), (1,)) === (3,)
    @test map(foo, (1,2), (1,2), (1,2)) === (3,6)
    @test map(foo, (1,2,3,4), (1,2,3,4), (1,2,3,4)) === (3,6,9,12)
    @test map(foo, longtuple, longtuple, longtuple) === ntuple(i->3i,20)
    @test_throws BoundsError map(foo, (), (1,), (1,))
    @test_throws BoundsError map(foo, (1,), (1,), ())
end

## comparison ##
@test isequal((), ())
@test isequal((1,2,3), (1,2,3))
@test !isequal((1,2,3), (1,2,4))
@test !isequal((1,2,3), (1,2))

@test ==((), ())
@test ==((1,2,3), (1,2,3))
@test !==((1,2,3), (1,2,4))
@test !==((1,2,3), (1,2))

@test isless((1,2), (1,3))
@test isless((1,), (1,2))
@test !isless((1,2), (1,2))
@test !isless((2,1), (1,2))


## functions ##
@test isempty(())
@test !isempty((1,))

@test reverse(()) === ()
@test reverse((1,2,3)) === (3,2,1)


## specialized reduction ##
@test sum((1,2,3)) === 6

@test prod(()) === 1
@test prod((1,2,3)) === 6

@test all(()) === true
@test all((false,)) === false
@test all((true,)) === true
@test all((true, true)) === true
@test all((true, false)) === false
@test all((false, false)) === false

@test any(()) === false
@test any((true,)) === true
@test any((false,)) === false
@test any((true, true)) === true
@test any((true, false)) === true
@test any((false, false)) === false
@test any((false,false,false)) === false
@test any((true,false,false)) === true
@test any((false,true,false)) === true
@test any((false,false,true)) === true
@test any((true,true,false)) === true
@test any((true,false,true)) === true
@test any((true,true,false)) === true
@test any((true,true,true)) === true

@test @inferred(ntuple(abs2, Val{0})) == ()
@test @inferred(ntuple(abs2, Val{2})) == (1, 4)
@test @inferred(ntuple(abs2, Val{3})) == (1, 4, 9)
@test @inferred(ntuple(abs2, Val{4})) == (1, 4, 9, 16)
@test @inferred(ntuple(abs2, Val{5})) == (1, 4, 9, 16, 25)
@test @inferred(ntuple(abs2, Val{6})) == (1, 4, 9, 16, 25, 36)
# issue #21697
@test_throws ArgumentError ntuple(abs2, Val{-1})

# issue #12854
@test_throws TypeError ntuple(identity, Val{1:2})

for n = 0:20
    t = ntuple(identity, n)
    @test length(t) == n
    for i = 1:n
        @test t[i] == i
    end
end

# issue #19719
@test_throws BoundsError (1,2,3)[falses(4)]
@test_throws BoundsError (1,2,3)[[false,false,true,true]]
@test_throws BoundsError (1,2,3)[trues(2)]
@test_throws BoundsError (1,2,3)[falses(2)]
@test_throws BoundsError ()[[false]]
@test_throws BoundsError ()[[true]]

struct BitPerm_19352
    p::NTuple{8,UInt8}
    function BitPerm(p::NTuple{8,UInt8})
        sort(collect(p)) != collect(0:7) && error("$p is not a permutation of 0:7")
        new(p)
    end
    BitPerm_19352(b0,b1,b2,b3,b4,b5,b6,b7) = BitPerm((UInt8(b0),UInt8(b1),UInt8(b2),UInt8(b3),
        UInt8(b4),UInt8(b5),UInt8(b6),UInt8(b7)))
end

@testset "side effect in tuple constructor #19352" begin
    @test BitPerm_19352(0,2,4,6,1,3,5,7).p[2] == 0x02
end

# issue #15703
let
    struct A_15703{N}
        keys::NTuple{N, Int}
    end

    struct B_15703
        x::A_15703
    end

    function bug_15703(xs...)
        [x for x in xs]
    end

    function test_15703()
        s = (1,)
        a = A_15703(s)
        ss = B_15703(a).x.keys
        @test ss === s
        bug_15703(ss...)
    end

    test_15703()
end

# PR #15516
@test Tuple{Char,Char}("za") === ('z','a')
@test_throws ArgumentError Tuple{Char,Char}("z")

@test NTuple{20,Int}(Iterators.countfrom(2)) === (2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21)
@test NTuple{20,Float64}(Iterators.countfrom(2)) === (2.,3.,4.,5.,6.,7.,8.,9.,10.,11.,12.,13.,14.,15.,16.,17.,18.,19.,20.,21.)
@test_throws ArgumentError NTuple{20,Int}([1,2])

@test Tuple{Vararg{Float32}}(Float64[1,2,3]) === (1.0f0, 2.0f0, 3.0f0)
@test Tuple{Int,Vararg{Float32}}(Float64[1,2,3]) === (1, 2.0f0, 3.0f0)
@test Tuple{Int,Vararg{Any}}(Float64[1,2,3]) === (1, 2.0, 3.0)
@test Tuple(ones(5)) === (1.0,1.0,1.0,1.0,1.0)
@test_throws MethodError convert(Tuple, ones(5))

@testset "Multidimensional indexing (issue #20453)" begin
    @test_throws MethodError (1,)[]
    @test_throws MethodError (1,1,1)[1,1]
end

@testset "ambiguity between tuple constructors #20990" begin
    Tuple16Int = Tuple{Int,Int,Int,Int,Int,Int,Int,Int,Int,Int,Int,Int,Int,Int,Int,Int}
    tuple16int = (1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1)
    @test Tuple16Int(tuple16int) isa Tuple16Int
end

# PR #21446
for n = 0:15
    @test ntuple(identity, Val{n}) == ntuple(identity, n)
end

# https://github.com/JuliaLang/julia/issues/21026#issuecomment-317113307
const VecTuple21026{T} = Tuple{VecElement{T}}
@test convert(VecTuple21026, (1,)) === (VecElement(1),)