import 'package:sky/src/fn3.dart';
import 'package:test/test.dart';

import '../fn3/widget_tester.dart';

class TestWidget extends StatefulComponent {
  TestWidget({ this.child, this.persistentState, this.syncedState });

  final Widget child;
  final int persistentState;
  final int syncedState;

  TestWidgetState createState() => new TestWidgetState();
}

class TestWidgetState extends State<TestWidget> {
  int persistentState;
  int syncedState;
  int updates = 0;

  void initState(BuildContext context) {
    super.initState(context);
    persistentState = config.persistentState;
    syncedState = config.syncedState;
  }

  void didUpdateConfig(TestWidget oldConfig) {
    syncedState = config.syncedState;
    // we explicitly do NOT sync the persistentState from the new instance
    // because we're using that to track whether we got recreated
    updates += 1;
  }

  Widget build(BuildContext context) => config.child;
}

void main() {

  test('no change', () {
    WidgetTester tester = new WidgetTester();

    tester.pumpFrame(
      new Container(
        child: new Container(
          child: new TestWidget(
            persistentState: 1,
            child: new Container()
          )
        )
      )
    );

    TestWidgetState state = tester.findStateOfType(TestWidgetState);

    expect(state.persistentState, equals(1));
    expect(state.updates, equals(0));

    tester.pumpFrame(
      new Container(
        child: new Container(
          child: new TestWidget(
            persistentState: 2,
            child: new Container()
          )
        )
      )
    );

    expect(state.persistentState, equals(1));
    expect(state.updates, equals(1));

    tester.pumpFrame(new Container());
  });

  test('remove one', () {

    WidgetTester tester = new WidgetTester();

    tester.pumpFrame(
      new Container(
        child: new Container(
          child: new TestWidget(
            persistentState: 10,
            child: new Container()
          )
        )
      )
    );

    TestWidgetState state = tester.findStateOfType(TestWidgetState);

    expect(state.persistentState, equals(10));
    expect(state.updates, equals(0));

    tester.pumpFrame(
      new Container(
        child: new TestWidget(
          persistentState: 11,
          child: new Container()
        )
      )
    );

    state = tester.findStateOfType(TestWidgetState);

    expect(state.persistentState, equals(11));
    expect(state.updates, equals(0));

    tester.pumpFrame(new Container());
  });

  test('swap instances around', () {

    WidgetTester tester = new WidgetTester();

    Widget a = new TestWidget(persistentState: 0x61, syncedState: 0x41, child: new Text('apple'));
    Widget b = new TestWidget(persistentState: 0x62, syncedState: 0x42, child: new Text('banana'));
    tester.pumpFrame(new Column([]));

    GlobalKey keyA = new GlobalKey();
    GlobalKey keyB = new GlobalKey();

    tester.pumpFrame(
      new Column([
        new Container(
          key: keyA,
          child: a
        ),
        new Container(
          key: keyB,
          child: b
        )
      ])
    );

    TestWidgetState first, second;

    first = tester.findStateByConfig(a);
    second = tester.findStateByConfig(b);

    expect(first.config, equals(a));
    expect(first.persistentState, equals(0x61));
    expect(first.syncedState, equals(0x41));
    expect(second.config, equals(b));
    expect(second.persistentState, equals(0x62));
    expect(second.syncedState, equals(0x42));

    tester.pumpFrame(
      new Column([
        new Container(
          key: keyA,
          child: a
        ),
        new Container(
          key: keyB,
          child: b
        )
      ])
    );

    first = tester.findStateByConfig(a);
    second = tester.findStateByConfig(b);

    // same as before
    expect(first.config, equals(a));
    expect(first.persistentState, equals(0x61));
    expect(first.syncedState, equals(0x41));
    expect(second.config, equals(b));
    expect(second.persistentState, equals(0x62));
    expect(second.syncedState, equals(0x42));

    // now we swap the nodes over
    // since they are both "old" nodes, they shouldn't sync with each other even though they look alike

    tester.pumpFrame(
      new Column([
        new Container(
          key: keyA,
          child: b
        ),
        new Container(
          key: keyB,
          child: a
        )
      ])
    );

    first = tester.findStateByConfig(b);
    second = tester.findStateByConfig(a);

    expect(first.config, equals(b));
    expect(first.persistentState, equals(0x61));
    expect(first.syncedState, equals(0x42));
    expect(second.config, equals(a));
    expect(second.persistentState, equals(0x62));
    expect(second.syncedState, equals(0x41));

  });

}