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package iter

import (

"reflect"

"testing"

)

func equals[T any](t *testing.T, a, b T) {

if !reflect.DeepEqual(a, b) {

t.Fatalf("%+v != %+v", a, b)

}

}

func TestSlice(t *testing.T) {

it := Slice([]int{1, 2, 3})

equals(t, it.Next().Unwrap(), 1)

equals(t, it.Next().Unwrap(), 2)

equals(t, it.Next().Unwrap(), 3)

equals(t, it.Next().IsNone(), true)

}

func TestRepeat(t *testing.T) {

it := Repeat(5)

equals(t, it.Next().Unwrap(), 5)

equals(t, it.Next().Unwrap(), 5)

equals(t, it.Next().Unwrap(), 5)

}

func TestTake(t *testing.T) {

it := Take(Repeat(5), 2)

equals(t, it.Next().Unwrap(), 5)

equals(t, it.Next().Unwrap(), 5)

equals(t, it.Next().IsNone(), true)

}

func TestMap(t *testing.T) {

it := Repeat(5)

equals(t, it.Next().Unwrap(), 5)

equals(t, it.Next().Unwrap(), 5)

equals(t, it.Next().Unwrap(), 5)

}

func TestFunc(t *testing.T) {

v := 0

it := Func(func() Option[int] {

if v < 3 {

ret := Some(v)

v++

return ret

} else {

return None[int]()

}

})

equals(t, it.Next().Unwrap(), 0)

equals(t, it.Next().Unwrap(), 1)

equals(t, it.Next().Unwrap(), 2)

equals(t, it.Next().IsNone(), true)

}

func TestEmpty(t *testing.T) {

it := Empty[int]()

equals(t, it.Next().IsNone(), true)

}

func TestOnce(t *testing.T) {

it := Once[int](10)

equals(t, it.Next().Unwrap(), 10)

equals(t, it.Next().IsNone(), true)

}

func TestToSlice(t *testing.T) {

slice1 := ToSlice(Take(Repeat(5), 3))

equals(t, slice1, []int{5, 5, 5})

slice2 := ToSlice(Empty[int]())

equals(t, slice2, []int{})

}

func TestDrop(t *testing.T) {

slice1 := ToSlice(Drop(Slice([]int{1, 2, 3, 4, 5}), 3))

equals(t, slice1, []int{4, 5})

slice2 := ToSlice(Drop(Slice([]int{1, 2, 3, 4, 5}), 0))

equals(t, slice2, []int{1, 2, 3, 4, 5})

slice3 := ToSlice(Drop(Slice([]int{1, 2, 3, 4, 5}), 5))

equals(t, slice3, []int{})

}

func TestDropWhile(t *testing.T) {

slice := ToSlice(

DropWhile(

Slice([]int{1, 2, 3, 4, 5}),

func(i int) bool {

return i < 4

},

),

)

equals(t, slice, []int{4, 5})

}

func TestTakeWhile(t *testing.T) {

slice := ToSlice(

TakeWhile(

Slice([]int{1, 2, 3, 4, 5}),

func(i int) bool {

return i < 4

},

),

)

equals(t, slice, []int{1, 2, 3})

}

func TestForEach(t *testing.T) {

it := Take(Repeat(1), 5)

var ret int

ForEach(it, func(i int) {

ret += i

})

equals(t, ret, 5)

}

func TestFold(t *testing.T) {

it := Slice([]int{1, 2, 3, 4, 5})

ret := Fold(it, 0, func(acc, i int) int {

return acc + i

})

equals(t, ret, 15)

}

func TestFuse(t *testing.T) {

state := true

it := Fuse(

Func(func() Option[int] {

ret := None[int]()

if state {

ret = Some(1)

}

state = !state

return ret

}),

)

equals(t, it.Next().Unwrap(), 1)

equals(t, it.Next().IsNone(), true)

equals(t, it.Next().IsNone(), true)

}

func TestChain(t *testing.T) {

it := Chain(

Slice([]int{1, 2}),

Slice([]int{3, 4}),

)

equals(t, ToSlice(it), []int{1, 2, 3, 4})

}

func TestFind(t *testing.T) {

it := Slice([]int{1, 2, 3, 4, 5})

v := Find(it, func(i int) bool {

return i > 3

})

equals(t, v, Some(4))

}

func TestFlatten(t *testing.T) {

it := Slice(

[]Iterator[int]{

Slice([]int{1, 2}),

Slice([]int{3, 4}),

},

)

equals(t, ToSlice(Flatten(it)), []int{1, 2, 3, 4})

}

func TestRange(t *testing.T) {

equals(t, ToSlice(Range(0, 5, 1)), []int{0, 1, 2, 3, 4})

equals(t, ToSlice(Range(0, 0, 1)), []int{})

equals(t, ToSlice(Range(0, -5, -1)), []int{0, -1, -2, -3, -4})

equals(t, ToSlice(Range(5, 10, -1)), []int{})

equals(t, ToSlice(Range(5, 10, 1)), []int{5, 6, 7, 8, 9})

}

func TestAll(t *testing.T) {

equals(t,

All(

Empty[int](),

func(n int) bool {

return n > 0

},

),

true,

)

equals(t,

All(

Slice([]int{5, 6, 7, 8, 9}),

func(n int) bool {

return n > 4

},

),

true,

)

equals(t,

All(

Slice([]int{1, 2, 3, 4, 5}),

func(n int) bool {

return n <= 3

},

),

false,

)

}

func TestAny(t *testing.T) {

equals(t,

Any(

Empty[int](),

func(n int) bool {

return n > 0

},

),

false,

)

equals(t,

Any(

Slice([]int{5, 6, 7, 8, 9}),

func(n int) bool {

return n > 7

},

),

true,

)

equals(t,

Any(

Slice([]int{1, 2, 3, 4, 5}),

func(n int) bool {

return n > 5

},

),

false,

)

}

func TestNth(t *testing.T) {

equals(t, Nth(Slice([]int{1, 2, 3, 4, 5}), 0).Unwrap(), 1)

equals(t, Nth(Slice([]int{1, 2, 3, 4, 5}), 4).Unwrap(), 5)

equals(t, Nth(Slice([]int{1, 2, 3, 4, 5}), 10).IsNone(), true)

}

func TestEqual(t *testing.T) {

equals(t, Equal(Slice([]int{}), Slice([]int{})), true)

equals(t, Equal(Slice([]int{1, 2, 3}), Slice([]int{1, 2, 3})), true)

equals(t, Equal(Slice([]int{1, 2, 3}), Slice([]int{1, 3, 2})), false)

equals(t, Equal(Slice([]int{1, 2, 3}), Slice([]int{1, 2})), false)

}

func TestEqualBy(t *testing.T) {

type Pair struct {

First, Second string

}

equals(

t,

EqualBy(

Slice([]Pair{Pair{"a", "b"}, Pair{"c", "d"}}),

Slice([]Pair{Pair{"a", "e"}, Pair{"c", "f"}}),

func(a, b Pair) bool {

return a.First == b.First

},

),

true,

)

equals(

t,

EqualBy(

Slice([]Pair{Pair{"a", "b"}, Pair{"c", "d"}}),

Slice([]Pair{Pair{"a", "e"}, Pair{"c", "f"}}),

func(a, b Pair) bool {

return a.Second == b.Second

},

),

false,

)

}

func TestString(t *testing.T) {

equals(

t,

Equal(

String("Hello"),

Slice([]rune{'H', 'e', 'l', 'l', 'o'}),

),

true,

)

}

func TestToString(t *testing.T) {

equals(

t,

ToString(String("Hello")),

"Hello",

)

}