import 'package:coves_flutter/models/community.dart';
import 'package:flutter_test/flutter_test.dart';

void main() {
  // Note: Full widget tests for CommunityPickerScreen require mocking the API
  // service and proper timer management. The core business logic is thoroughly
  // tested in the unit test groups below (search filtering, count formatting,
  // description building). Widget integration tests would need a mock API service
  // to avoid real network calls and pending timer issues from the search debounce.

  group('CommunityPickerScreen Search Filtering', () {
    test('client-side filtering should match name', () {
      final communities = [
        CommunityView(did: 'did:1', name: 'programming'),
        CommunityView(did: 'did:2', name: 'gaming'),
        CommunityView(did: 'did:3', name: 'music'),
      ];

      final query = 'prog';

      final filtered = communities.where((community) {
        final name = community.name.toLowerCase();
        return name.contains(query.toLowerCase());
      }).toList();

      expect(filtered.length, 1);
      expect(filtered[0].name, 'programming');
    });

    test('client-side filtering should match displayName', () {
      final communities = [
        CommunityView(
          did: 'did:1',
          name: 'prog',
          displayName: 'Programming Discussion',
        ),
        CommunityView(did: 'did:2', name: 'gaming', displayName: 'Gaming'),
        CommunityView(did: 'did:3', name: 'music', displayName: 'Music'),
      ];

      final query = 'discussion';

      final filtered = communities.where((community) {
        final name = community.name.toLowerCase();
        final displayName = community.displayName?.toLowerCase() ?? '';
        return name.contains(query.toLowerCase()) ||
            displayName.contains(query.toLowerCase());
      }).toList();

      expect(filtered.length, 1);
      expect(filtered[0].displayName, 'Programming Discussion');
    });

    test('client-side filtering should match description', () {
      final communities = [
        CommunityView(
          did: 'did:1',
          name: 'prog',
          description: 'A place to discuss coding and software',
        ),
        CommunityView(
          did: 'did:2',
          name: 'gaming',
          description: 'Gaming news and discussions',
        ),
        CommunityView(
          did: 'did:3',
          name: 'music',
          description: 'Music appreciation',
        ),
      ];

      final query = 'software';

      final filtered = communities.where((community) {
        final name = community.name.toLowerCase();
        final description = community.description?.toLowerCase() ?? '';
        return name.contains(query.toLowerCase()) ||
            description.contains(query.toLowerCase());
      }).toList();

      expect(filtered.length, 1);
      expect(filtered[0].name, 'prog');
    });

    test('client-side filtering should be case insensitive', () {
      final communities = [
        CommunityView(did: 'did:1', name: 'Programming'),
        CommunityView(did: 'did:2', name: 'GAMING'),
        CommunityView(did: 'did:3', name: 'music'),
      ];

      final query = 'PROG';

      final filtered = communities.where((community) {
        final name = community.name.toLowerCase();
        return name.contains(query.toLowerCase());
      }).toList();

      expect(filtered.length, 1);
      expect(filtered[0].name, 'Programming');
    });

    test('empty query should return all communities', () {
      final communities = [
        CommunityView(did: 'did:1', name: 'programming'),
        CommunityView(did: 'did:2', name: 'gaming'),
        CommunityView(did: 'did:3', name: 'music'),
      ];

      final query = '';

      List<CommunityView> filtered;
      if (query.isEmpty) {
        filtered = communities;
      } else {
        filtered = communities.where((community) {
          final name = community.name.toLowerCase();
          return name.contains(query.toLowerCase());
        }).toList();
      }

      expect(filtered.length, 3);
    });

    test('no match should return empty list', () {
      final communities = [
        CommunityView(did: 'did:1', name: 'programming'),
        CommunityView(did: 'did:2', name: 'gaming'),
        CommunityView(did: 'did:3', name: 'music'),
      ];

      final query = 'xyz123';

      final filtered = communities.where((community) {
        final name = community.name.toLowerCase();
        final displayName = community.displayName?.toLowerCase() ?? '';
        final description = community.description?.toLowerCase() ?? '';
        return name.contains(query.toLowerCase()) ||
            displayName.contains(query.toLowerCase()) ||
            description.contains(query.toLowerCase());
      }).toList();

      expect(filtered.length, 0);
    });
  });

  group('CommunityPickerScreen Member Count Formatting', () {
    String formatCount(int? count) {
      if (count == null) {
        return '0';
      }
      if (count >= 1000000) {
        return '${(count / 1000000).toStringAsFixed(1)}M';
      } else if (count >= 1000) {
        return '${(count / 1000).toStringAsFixed(1)}K';
      }
      return count.toString();
    }

    test('should format null count as 0', () {
      expect(formatCount(null), '0');
    });

    test('should format small numbers as-is', () {
      expect(formatCount(0), '0');
      expect(formatCount(1), '1');
      expect(formatCount(100), '100');
      expect(formatCount(999), '999');
    });

    test('should format thousands with K suffix', () {
      expect(formatCount(1000), '1.0K');
      expect(formatCount(1500), '1.5K');
      expect(formatCount(10000), '10.0K');
      expect(formatCount(999999), '1000.0K');
    });

    test('should format millions with M suffix', () {
      expect(formatCount(1000000), '1.0M');
      expect(formatCount(1500000), '1.5M');
      expect(formatCount(10000000), '10.0M');
    });
  });

  group('CommunityPickerScreen Description Building', () {
    test('should build description with member count only', () {
      const memberCount = 1000;
      const subscriberCount = 0;

      String formatCount(int count) {
        if (count >= 1000) {
          return '${(count / 1000).toStringAsFixed(1)}K';
        }
        return count.toString();
      }

      var descriptionLine = '';
      if (memberCount > 0) {
        descriptionLine = '${formatCount(memberCount)} members';
      }

      expect(descriptionLine, '1.0K members');
    });

    test('should build description with member and subscriber counts', () {
      const memberCount = 1000;
      const subscriberCount = 500;

      String formatCount(int count) {
        if (count >= 1000) {
          return '${(count / 1000).toStringAsFixed(1)}K';
        }
        return count.toString();
      }

      var descriptionLine = '';
      if (memberCount > 0) {
        descriptionLine = '${formatCount(memberCount)} members';
        if (subscriberCount > 0) {
          descriptionLine += ' · ${formatCount(subscriberCount)} subscribers';
        }
      }

      expect(descriptionLine, '1.0K members · 500 subscribers');
    });

    test('should build description with subscriber count only', () {
      const memberCount = 0;
      const subscriberCount = 500;

      String formatCount(int count) {
        if (count >= 1000) {
          return '${(count / 1000).toStringAsFixed(1)}K';
        }
        return count.toString();
      }

      var descriptionLine = '';
      if (memberCount > 0) {
        descriptionLine = '${formatCount(memberCount)} members';
      } else if (subscriberCount > 0) {
        descriptionLine = '${formatCount(subscriberCount)} subscribers';
      }

      expect(descriptionLine, '500 subscribers');
    });

    test('should append community description with separator', () {
      const memberCount = 100;
      const description = 'A great community';

      String formatCount(int count) => count.toString();

      var descriptionLine = '';
      if (memberCount > 0) {
        descriptionLine = '${formatCount(memberCount)} members';
      }
      if (description.isNotEmpty) {
        if (descriptionLine.isNotEmpty) {
          descriptionLine += ' · ';
        }
        descriptionLine += description;
      }

      expect(descriptionLine, '100 members · A great community');
    });
  });
}