import 'package:flutter/material.dart';
import 'package:flutter_screenutil/flutter_screenutil.dart';
import 'package:flutter_test/flutter_test.dart';

import 'package:miler/data/load_state.dart';
import 'package:miler/views/helpers/widgets/load_state_view.dart';

/// ─────────────────────────────────────────────────────────────────────────
/// FOUR SCREENS, ONE ANSWER PER STATE
///
/// Every screen decided independently what a failure looked like — usually by
/// rendering its empty state, which tells a rider to wait for work that is
/// actually a dead request. These pin the mapping, and in particular the two
/// cases that were previously indistinguishable.
/// ─────────────────────────────────────────────────────────────────────────
void main() {
  Future<void> pump(
    WidgetTester tester,
    LoadState<List<String>> state, {
    Future<void> Function()? onRetry,
  }) async {
    await tester.pumpWidget(
      ScreenUtilInit(
        designSize: const Size(390, 844),
        builder: (_, _) => MaterialApp(
          home: Scaffold(
            body: SingleChildScrollView(
              child: LoadStateView<List<String>>(
                state: state,
                onRetry: onRetry,
                empty: const Text('NOTHING TODAY'),
                builder: (v, refreshing) =>
                    Text('${v.join(",")} refreshing=$refreshing'),
              ),
            ),
          ),
        ),
      ),
    );
    await tester.pump();
  }

  testWidgets('data renders, and says whether a refresh is behind it', (
    tester,
  ) async {
    await pump(tester, const LoadData(['a', 'b'], refreshing: true));
    expect(find.text('a,b refreshing=true'), findsOneWidget);
  });

  testWidgets('an empty day is the screen\'s own empty state', (tester) async {
    await pump(tester, const LoadEmpty<List<String>>());
    expect(find.text('NOTHING TODAY'), findsOneWidget);
  });

  // ── The distinction the old code could not make ──
  testWidgets('a failure is never the empty state', (tester) async {
    await pump(
      tester,
      const LoadFailure<List<String>>(
        LoadFailureKind.server,
        message: 'hub is down',
      ),
      onRetry: () async {},
    );

    expect(
      find.text('NOTHING TODAY'),
      findsNothing,
      reason: 'telling a rider to wait for work is wrong when the request died',
    );
    // The server's own sentence, not one this app invented.
    expect(find.text('hub is down'), findsOneWidget);
    expect(find.text('Try again'), findsOneWidget);
  });

  testWidgets('offline says so and offers a retry', (tester) async {
    await pump(
      tester,
      const LoadFailure<List<String>>(LoadFailureKind.offline),
      onRetry: () async {},
    );
    expect(find.text('No connection'), findsOneWidget);
    expect(find.text('Try again'), findsOneWidget);
  });

  testWidgets('an expired session offers no retry', (tester) async {
    await pump(
      tester,
      const LoadFailure<List<String>>(LoadFailureKind.unauthorized),
      onRetry: () async {},
    );
    expect(find.text('Signed out'), findsOneWidget);
    expect(
      find.text('Try again'),
      findsNothing,
      reason: 'retrying cannot succeed without signing in again',
    );
  });

  testWidgets('rate limiting does not invite another tap', (tester) async {
    await pump(
      tester,
      const LoadFailure<List<String>>(LoadFailureKind.rateLimited),
      onRetry: () async {},
    );
    expect(find.text('Too many requests'), findsOneWidget);
  });

  // ── Unavailable is neither an error nor an empty day ──
  testWidgets('a line with no endpoint gets its own state and no retry', (
    tester,
  ) async {
    await pump(
      tester,
      const LoadUnavailable<List<String>>('Milk Man work is not served yet.'),
      onRetry: () async {},
    );

    expect(find.text('Not available yet'), findsOneWidget);
    expect(find.text('Milk Man work is not served yet.'), findsOneWidget);
    expect(find.text('NOTHING TODAY'), findsNothing);
    expect(
      find.text('Try again'),
      findsNothing,
      reason: 'nothing the rider does changes a missing backend capability',
    );
  });

  testWidgets('the retry actually runs', (tester) async {
    var tries = 0;
    await pump(
      tester,
      const LoadFailure<List<String>>(LoadFailureKind.offline),
      onRetry: () async => tries++,
    );
    await tester.tap(find.text('Try again'));
    await tester.pump();
    expect(tries, 1);
  });
}