import (
	"fmt"
	"golang.org/x/tour/tree"
)

// Walk walks the tree t sending all values
// from the tree to the channel ch.
func Walk(t *tree.Tree, ch chan int) {
	if t.Left != nil {
		go Walk(t.Left, ch)
	}

	ch <- t.Value

	if t.Right != nil {
		go Walk(t.Right, ch)
	}

	//hacky but it's assumed to be 1 - 10
	if t.Value == 10 {
		close(ch)
	}
}

// Same determines whether the trees
// t1 and t2 contain the same values.
func Same(t1, t2 *tree.Tree) bool {
	ch1 := make(chan int)
	ch2 := make(chan int)

	go Walk(t1, ch1)
	go Walk(t2, ch2)

	for {
		x, ok := <-ch1
		if !ok {
			break
		}
		y, ok := <-ch2
		if !ok {
			break
		}
		if x != y {
			return false
		}
	}
	return true
}

func main() {
	fmt.Println(Same(tree.New(1), tree.New(1)))
}