package main

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

// type Tree struct {
// 	Left	*Tree
// 	Value	int
// 	Right	*Tree
// }

func Walk(t *tree.Tree, ch chan int) {
	defer close(ch)
	var walker func(t *tree.Tree)
	walker = func (t *tree.Tree) {
		if t == nil {
			return
		}
		walker(t.Left)
		ch <- t.Value
		walker(t.Right)
	}
	walker(t)
}

func Same(t1, t2 *tree.Tree) bool {
	ch1 := make(chan int)
	ch2 := make(chan int)

	go Walk(t1, ch1)
	go Walk(t2, ch2)
	for i := range ch1 {
		v := <- ch2
		if i != v {
			return false
		}
	}
	return true
}

func main() {
	ch := make(chan int)
	fmt.Println("START")
	// Create two trees
	t1 := tree.New(2)
	t2 := tree.New(2)
	t3 := tree.New(3)
	go Walk(t1, ch)
	for i := range ch {
		fmt.Println(i)
	}

	same_1 := Same(t1, t2)
	same_2 := Same(t2, t3)
	fmt.Println(same_1, same_2)
}