// Part of the Carbon Language project, under the Apache License v2.0 with LLVM
// Exceptions. See /LICENSE for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
// AUTOUPDATE

package ExplorerTest api;

class ListElement {
  fn Create(value: i32) -> ListElement {
    return {.element = Optional(i32).Create(value),
   	    .next = Optional(ListElement*).CreateEmpty()};
  }

  fn set[addr self: Self*](value: Optional(ListElement*)) {
    (*self).next = value;
  }

  var element: Optional(i32);
  var next: Optional(ListElement*);
}

class List {
  fn Create() -> List {
    return {.next = Optional(ListElement*).CreateEmpty()};
  }

  fn insert[addr self: (Self*)](value: i32) {
    if (not (*self).next.HasValue()) {
      (*self).next = Optional(ListElement*).Create(
          heap.New(ListElement.Create(value)));
      return;
    }

    var iter: Optional(ListElement*) = (*self).next;
    var node: auto = iter.Get();
    while ((*node).next.HasValue()) {
      iter = (*node).next;
      node = iter.Get();
    }

    var v: ListElement* = iter.Get();
    var x: Optional(ListElement*)
        = Optional(ListElement*).Create(heap.New((*node)));
    (*v).set(x);
  }

  fn clean[addr self: (Self*)]() {
    var head: auto = (*self).next;
    while (head.HasValue()) {
      var tmp: auto = head;
      head = (*head.Get()).next;
      heap.Delete(tmp.Get());
    }

    (*self).next = Optional(ListElement*).CreateEmpty();
  }

  var next: Optional(ListElement*);
}

fn Main() -> i32 {
  var list: List = List.Create();
  list.insert(2);
  list.insert(3);
  list.clean();
  return 0;
}

// CHECK:STDOUT: result: 0
