import 'package:flutter_test/flutter_test.dart';
import 'package:kouyu_english/core/ai_config.dart';
import 'package:kouyu_english/core/ai_service.dart';
import 'package:kouyu_english/core/models.dart';

void main() {
  TestWidgetsFlutterBinding.ensureInitialized();

  group('AiService resolveEndpointUri', () {
    test('resolves OpenAI endpoint ending in /v1 to /v1/chat/completions', () {
      final uri = AiService.resolveEndpointUri(
        provider: AiProviderType.openAi,
        endpoint: 'https://api.openai.com/v1',
        model: 'gpt-4o-mini',
      );
      expect(uri.toString(), equals('https://api.openai.com/v1/chat/completions'));
    });

    test('resolves OpenAI endpoint without /v1 to /v1/chat/completions', () {
      final uri = AiService.resolveEndpointUri(
        provider: AiProviderType.openAi,
        endpoint: 'https://api.openai.com',
        model: 'gpt-4o-mini',
      );
      expect(uri.toString(), equals('https://api.openai.com/v1/chat/completions'));
    });

    test('resolves custom compatible endpoint to /v1/chat/completions', () {
      final uri = AiService.resolveEndpointUri(
        provider: AiProviderType.compatible,
        endpoint: 'https://codex.slcydia.fun/v1',
        model: 'gpt-4o-mini',
      );
      expect(uri.toString(), equals('https://codex.slcydia.fun/v1/chat/completions'));
    });

    test('preserves endpoint already ending in /v1/chat/completions', () {
      final uri = AiService.resolveEndpointUri(
        provider: AiProviderType.compatible,
        endpoint: 'https://codex.slcydia.fun/v1/chat/completions',
        model: 'gpt-4o-mini',
      );
      expect(uri.toString(), equals('https://codex.slcydia.fun/v1/chat/completions'));
    });

    test('preserves /responses endpoint for OpenAI Responses API support', () {
      final uri = AiService.resolveEndpointUri(
        provider: AiProviderType.compatible,
        endpoint: 'https://codex.slcydia.fun/v1/responses',
        model: 'gpt-4o-mini',
      );
      expect(uri.toString(), equals('https://codex.slcydia.fun/v1/responses'));
    });

    test('resolves Gemini endpoint to :generateContent', () {
      final uri = AiService.resolveEndpointUri(
        provider: AiProviderType.gemini,
        endpoint: 'https://generativelanguage.googleapis.com/v1beta',
        model: 'gemini-2.5-flash',
      );
      expect(
        uri.toString(),
        equals('https://generativelanguage.googleapis.com/v1beta/models/gemini-2.5-flash:generateContent'),
      );
    });
  });

  group('AiConfigFile', () {
    test('parses standard JSON configuration correctly', () {
      const rawJson = '''{
        "provider": "compatible",
        "endpoint": "https://api.openai.com/v1",
        "model": "gpt-4o-mini",
        "apiKey": "sk-test-key-12345",
        "description": "Default AI configuration"
      }''';

      final config = AiConfigFile.parse(rawJson);
      expect(config.provider, equals(AiProviderType.compatible));
      expect(config.endpoint, equals('https://api.openai.com/v1'));
      expect(config.model, equals('gpt-4o-mini'));
      expect(config.apiKey, equals('sk-test-key-12345'));
      expect(config.description, equals('Default AI configuration'));
    });

    test('handles case-insensitive provider mapping and fallbacks', () {
      const openAiJson = '{"provider": "openAi", "endpoint": "https://api.openai.com/v1", "model": "gpt-4o"}';
      expect(AiConfigFile.parse(openAiJson).provider, equals(AiProviderType.openAi));

      const geminiJson = '{"provider": "GEMINI", "endpoint": "https://generativelanguage.googleapis.com/v1beta", "model": "gemini-2.5-flash"}';
      expect(AiConfigFile.parse(geminiJson).provider, equals(AiProviderType.gemini));

      const mockJson = '{"provider": "mock", "endpoint": "", "model": ""}';
      expect(AiConfigFile.parse(mockJson).provider, equals(AiProviderType.mock));

      const unknownJson = '{"provider": "unknown_provider", "endpoint": "", "model": ""}';
      expect(AiConfigFile.parse(unknownJson).provider, equals(AiProviderType.compatible));
    });

    test('serializes to JSON correctly', () {
      const config = AiConfigFile(
        provider: AiProviderType.compatible,
        endpoint: 'http://localhost:8000/v1',
        model: 'llama3',
        apiKey: 'sk-local',
        description: 'Local proxy',
      );
      final json = config.toJson();
      expect(json['provider'], equals('compatible'));
      expect(json['endpoint'], equals('http://localhost:8000/v1'));
      expect(json['model'], equals('llama3'));
      expect(json['apiKey'], equals('sk-local'));
      expect(json['description'], equals('Local proxy'));
    });
  });

  group('AiService API Key Resolution', () {
    test('uses explicit key over fallback key', () async {
      AiService.instance.setFallbackApiKey('fallback-key');
      final key = await AiService.instance.resolveApiKey('explicit-override');
      expect(key, equals('explicit-override'));
    });

    test('falls back to fallbackApiKey when no explicit or secure key is set', () async {
      AiService.instance.setFallbackApiKey('config-file-key');
      final key = await AiService.instance.resolveApiKey();
      expect(key, equals('config-file-key'));
    });
  });
}