// Surface-level tests for the FlowRunDriver approval hooks
// added in editor 0.21.0. The card itself is a private widget;
// these tests cover the driver-side contract that the card
// depends on so that legacy / mis-implementing hosts surface
// in CI rather than at runtime.

import 'dart:async';
import 'dart:typed_data';

import 'package:fai_studio_flow_editor/src/run_driver.dart';
import 'package:flutter_test/flutter_test.dart';

void main() {
  group('FlowRunDriver default approval implementation', () {
    test('pendingApprovalIdForStep returns null when not overridden',
        () async {
      final d = _NullDriver();
      final id = await d.pendingApprovalIdForStep(
        flowName: 'f',
        stepId: 's',
      );
      expect(id, isNull);
    });

    test('approveApproval throws UnsupportedError by default',
        () async {
      final d = _NullDriver();
      await expectLater(
        d.approveApproval(approvalId: 'x', reviewer: 'r'),
        throwsA(isA<UnsupportedError>()),
      );
    });

    test('rejectApproval throws UnsupportedError by default',
        () async {
      final d = _NullDriver();
      await expectLater(
        d.rejectApproval(approvalId: 'x', reviewer: 'r', reason: 'y'),
        throwsA(isA<UnsupportedError>()),
      );
    });
  });

  group('FlowRunDriver fake host implementation', () {
    test('full happy path: lookup → approve → state observable',
        () async {
      final d = _FakeApprovalDriver();
      d.pending['flowA|stepX'] = 'a-123';

      final id = await d.pendingApprovalIdForStep(
        flowName: 'flowA',
        stepId: 'stepX',
      );
      expect(id, 'a-123');

      await d.approveApproval(approvalId: 'a-123', reviewer: 'alice');
      expect(d.approvals, hasLength(1));
      expect(d.approvals.first, ('a-123', 'alice'));
    });

    test('reject path carries reason through', () async {
      final d = _FakeApprovalDriver();
      d.pending['flowA|stepX'] = 'a-123';

      await d.rejectApproval(
        approvalId: 'a-123',
        reviewer: 'alice',
        reason: 'missing signature',
      );
      expect(d.rejections, hasLength(1));
      expect(d.rejections.first.$3, 'missing signature');
    });
  });
}

/// Minimal driver that overrides nothing. Used to verify the
/// default-throw stubs from `run_driver.dart`.
class _NullDriver extends FlowRunDriver {
  @override
  Future<Map<String, FlowOutputValue>> runFlow({
    required String flowName,
    required Map<String, String> textInputs,
    required Map<String, Uint8List> fileInputs,
    required Map<String, String> fileMimes,
  }) async =>
      const {};

  @override
  Stream<FlowRunEvent> events() => const Stream.empty();
}

/// Studio-shaped driver mock — implements every approval hook
/// + tracks side effects so tests can assert on them.
class _FakeApprovalDriver extends FlowRunDriver {
  final Map<String, String> pending = {};
  final List<(String, String)> approvals = [];
  final List<(String, String, String)> rejections = [];

  @override
  Future<Map<String, FlowOutputValue>> runFlow({
    required String flowName,
    required Map<String, String> textInputs,
    required Map<String, Uint8List> fileInputs,
    required Map<String, String> fileMimes,
  }) async =>
      const {};

  @override
  Stream<FlowRunEvent> events() => const Stream.empty();

  @override
  Future<String?> pendingApprovalIdForStep({
    required String flowName,
    required String stepId,
  }) async =>
      pending['$flowName|$stepId'];

  @override
  Future<void> approveApproval({
    required String approvalId,
    required String reviewer,
  }) async {
    approvals.add((approvalId, reviewer));
  }

  @override
  Future<void> rejectApproval({
    required String approvalId,
    required String reviewer,
    required String reason,
  }) async {
    rejections.add((approvalId, reviewer, reason));
  }
}