import 'package:flutter/material.dart';
import 'package:flutter_test/flutter_test.dart';
import 'package:flutter_riverpod/flutter_riverpod.dart';
import 'package:metatron_student_erp/features/announcements/announcements_screen.dart';
import 'package:metatron_student_erp/models/announcement.dart';
import 'package:metatron_student_erp/providers/announcement_provider.dart';
import 'package:metatron_student_erp/repositories/announcement_repository.dart';

void main() {
  final sampleAnnouncements = [
    const AnnouncementItem(
      id: 201,
      title: 'Fee Payment Deadline',
      name: 'Fee Payment Deadline',
      date: '2026-10-15',
      datePublished: '2026-10-15',
      expiryDate: '2026-11-15',
      summary: 'Please ensure semester fees are paid before deadline.',
      content: '<p>Please ensure semester fees are paid before deadline.</p>',
      type: 'circular',
      priority: '2',
      author: 'Finance Office',
      hasAttachment: true,
      circularFilename: 'fee_notice.pdf',
    ),
    const AnnouncementItem(
      id: 202,
      title: 'Sports Day 2026',
      name: 'Sports Day 2026',
      date: '2026-10-18',
      datePublished: '2026-10-18',
      summary: 'Annual athletics and sports events registrations.',
      content: '<p>Annual athletics and sports events registrations.</p>',
      type: 'event',
      priority: '1',
      author: 'Sports Committee',
      hasAttachment: false,
    ),
  ];

  Widget buildTestableScreen(List<Override> overrides) {
    return ProviderScope(
      overrides: overrides,
      child: const MaterialApp(
        home: AnnouncementsScreen(),
      ),
    );
  }

  testWidgets('AnnouncementsScreen renders loading state initially', (tester) async {
    await tester.pumpWidget(
      buildTestableScreen([
        announcementsProvider.overrideWith((ref) => Future.delayed(
              const Duration(seconds: 1),
              () => const AnnouncementPageResult(
                announcements: [],
                totalCount: 0,
                page: 1,
                limit: 20,
              ),
            )),
      ]),
    );

    expect(find.byType(CircularProgressIndicator), findsOneWidget);
    await tester.pumpAndSettle();
  });

  testWidgets('AnnouncementsScreen renders empty state when no notices exist', (tester) async {
    await tester.pumpWidget(
      buildTestableScreen([
        announcementsProvider.overrideWith((ref) => Future.value(
              const AnnouncementPageResult(
                announcements: [],
                totalCount: 0,
                page: 1,
                limit: 20,
              ),
            )),
      ]),
    );

    await tester.pumpAndSettle();
    expect(find.text('No announcements found'), findsOneWidget);
  });

  testWidgets('AnnouncementsScreen renders filter chips and notice cards with priority badges', (tester) async {
    await tester.pumpWidget(
      buildTestableScreen([
        announcementsProvider.overrideWith((ref) => Future.value(
              AnnouncementPageResult(
                announcements: sampleAnnouncements,
                totalCount: 2,
                page: 1,
                limit: 20,
              ),
            )),
      ]),
    );

    await tester.pumpAndSettle();

    // Verify filter chips
    expect(find.text('All'), findsOneWidget);
    expect(find.text('Notices'), findsOneWidget);
    expect(find.text('Circulars'), findsOneWidget);
    expect(find.text('Events'), findsOneWidget);

    // Verify card titles and badges
    expect(find.text('Fee Payment Deadline'), findsOneWidget);
    expect(find.text('Urgent'), findsOneWidget);
    expect(find.text('Circular'), findsOneWidget);
    expect(find.text('Sports Day 2026'), findsOneWidget);
    expect(find.text('Important'), findsOneWidget);
    expect(find.text('Event'), findsOneWidget);
    expect(find.text('fee_notice.pdf'), findsOneWidget);
  });

  testWidgets('AnnouncementsScreen opens detail bottom sheet when card is tapped', (tester) async {
    await tester.pumpWidget(
      buildTestableScreen([
        announcementsProvider.overrideWith((ref) => Future.value(
              AnnouncementPageResult(
                announcements: sampleAnnouncements,
                totalCount: 2,
                page: 1,
                limit: 20,
              ),
            )),
      ]),
    );

    await tester.pumpAndSettle();

    // Tap the first card
    await tester.tap(find.text('Fee Payment Deadline'));
    await tester.pumpAndSettle();

    // Check detail sheet elements
    expect(find.text('Details'), findsOneWidget);
    expect(find.text('Posted by: Finance Office'), findsOneWidget);
    expect(find.text('Expires on: 2026-11-15'), findsOneWidget);
    expect(find.text('Close'), findsOneWidget);

    // Close the sheet
    await tester.tap(find.text('Close'));
    await tester.pumpAndSettle();
    expect(find.text('Details'), findsNothing);
  });

  testWidgets('AnnouncementsScreen renders error state and retry button on failure', (tester) async {
    await tester.pumpWidget(
      buildTestableScreen([
        announcementsProvider.overrideWith((ref) => Future.error('Connection timeout')),
      ]),
    );

    await tester.pumpAndSettle();

    expect(find.text('Failed to load announcements'), findsOneWidget);
    expect(find.text('Retry'), findsOneWidget);
  });
}