package graphvent

import (
  "testing"
  "time"
  "reflect"
)

func checkSignal[S Signal](t *testing.T, signal Signal, check func(S)){
  response_casted, cast_ok := signal.(S)
  if cast_ok == false {
    error_signal, is_error := signal.(*ErrorSignal)
    if is_error {
      t.Fatal(error_signal.Error)
    }
    t.Fatalf("Response of wrong type %s", reflect.TypeOf(signal))
  }

  check(response_casted)
}

func testSendACL[S Signal](t *testing.T, ctx *Context, listener *Node, action Tree, policies []Policy, check func(S)){
  acl_node, err := NewNode(ctx, nil, BaseNodeType, 100, []Policy{DefaultACLPolicy}, NewACLExt(policies))
  fatalErr(t, err)

  acl_signal := NewACLSignal(listener.ID, action)
  response := testSend(t, ctx, acl_signal, listener, acl_node)

  checkSignal(t, response, check)
}

func testErrorSignal(t *testing.T, error_string string) func(*ErrorSignal){
  return func(response *ErrorSignal) {
    if response.Error != error_string {
      t.Fatalf("Wrong error: %s", response.Error)
    }
  }
}

func testSuccess(*SuccessSignal){}

func testSend(t *testing.T, ctx *Context, signal Signal, source, destination *Node) ResponseSignal {
  source_listener, err := GetExt[*ListenerExt](source, ListenerExtType)
  fatalErr(t, err)

  messages := Messages{}
  messages = messages.Add(ctx, source.ID, source.Key, signal, destination.ID)
  fatalErr(t, ctx.Send(messages))

  response, err := WaitForResponse(source_listener.Chan, time.Millisecond*10, signal.ID())
  fatalErr(t, err)

  return response
}

func TestACLBasic(t *testing.T) {
  ctx := logTestContext(t, []string{"test", "acl"})

  listener, err := NewNode(ctx, nil, BaseNodeType, 100, nil, NewListenerExt(100))
  fatalErr(t, err)

  testSendACL(t, ctx, listener, nil, nil, testErrorSignal(t, "acl_denied"))

  testSendACL(t, ctx, listener, nil, []Policy{NewAllNodesPolicy(nil)}, testSuccess)

  group, err := NewNode(ctx, nil, GroupNodeType, 100, []Policy{
    DefaultGroupPolicy,
    NewPerNodePolicy(map[NodeID]Tree{
      listener.ID: {
        SerializedType(AddMemberSignalType): nil,
      },
    }),
  }, NewGroupExt(nil))
  fatalErr(t, err)

  testSendACL(t, ctx, listener, nil, []Policy{
    NewMemberOfPolicy(map[NodeID]Tree{
      group.ID: nil,
    }),
  }, testErrorSignal(t, "acl_denied"))

  add_member_signal := NewAddMemberSignal(listener.ID)
  add_member_response := testSend(t, ctx, add_member_signal, listener, group)
  checkSignal(t, add_member_response, testSuccess)

  testSendACL(t, ctx, listener, nil, []Policy{
    NewMemberOfPolicy(map[NodeID]Tree{
      group.ID: nil,
    }),
  }, testSuccess)
}