// Behaviour tests for FlowEditorController — the bridge
// between the YAML buffer + the graph + the layout sidecar.
// The model tests cover parsing correctness; these cover
// that the controller wires text -> graph reparsing,
// graph -> YAML emission, selection bookkeeping, and
// dirty/saved transitions correctly.

import 'package:fai_studio_flow_editor/src/editor_controller.dart';
import 'package:fai_studio_flow_editor/src/model/flow_graph.dart';
import 'package:flutter_test/flutter_test.dart';

void main() {
  group('FlowEditorController', () {
    test('openFlow seeds the graph + clears the dirty flag', () {
      final c = FlowEditorController();
      addTearDown(c.dispose);
      c.openFlow('hello', '''
name: hello
inputs:
  name: text
steps:
  - id: greet
    use: debug.echo@^0
    with:
      message: \$inputs.name
outputs:
  greeting: \$greet.echoed
''');
      expect(c.activeName, 'hello');
      expect(c.graph.steps, hasLength(1));
      expect(c.graph.steps.single.id, 'greet');
      expect(c.isDirty, isFalse);
    });

    test('graph edit re-emits YAML into the text buffer', () {
      final c = FlowEditorController();
      addTearDown(c.dispose);
      c.openFlow('demo', '''
name: demo
steps:
  - id: a
    use: debug.echo@^0
outputs: {}
''');
      final initialText = c.codeController.fullText;
      c.applyGraphEdit(
        c.graph.withStepAdded(const FlowStep(id: 'b', use: 'debug.echo@^0')),
      );
      expect(c.codeController.fullText, isNot(initialText));
      expect(c.codeController.fullText, contains('id: b'));
      expect(c.graph.steps, hasLength(2));
    });

    test('graph edit marks the buffer dirty against the baseline', () {
      final c = FlowEditorController();
      addTearDown(c.dispose);
      c.openFlow('demo', '''
steps:
  - id: a
    use: debug.echo@^0
outputs: {}
''');
      expect(c.isDirty, isFalse);
      c.applyGraphEdit(
        c.graph.withStepAdded(const FlowStep(id: 'b', use: 'debug.echo@^0')),
      );
      expect(c.isDirty, isTrue);
      c.markSaved();
      expect(c.isDirty, isFalse);
    });

    test('selectStep notifies listeners only on change', () {
      final c = FlowEditorController();
      addTearDown(c.dispose);
      c.openFlow('demo', '''
steps:
  - id: only
    use: debug.echo@^0
outputs: {}
''');
      var calls = 0;
      c.addListener(() => calls++);
      c.selectStep('only');
      final after = calls;
      // Selecting the same thing again must NOT bump the
      // listener count — the controller short-circuits.
      c.selectStep('only');
      expect(calls, after);
      c.selectStep(null);
      expect(calls, after + 1);
    });
  });
}