import 'dart:convert';
import 'package:flutter/services.dart';
import 'models.dart';

class AiConfigFile {
  const AiConfigFile({
    required this.provider,
    required this.endpoint,
    required this.model,
    this.apiKey,
    this.description,
  });

  final AiProviderType provider;
  final String endpoint;
  final String model;
  final String? apiKey;
  final String? description;

  static const String defaultAssetPath = 'assets/config/ai_config.json';

  factory AiConfigFile.fromJson(Map<String, dynamic> json) {
    final providerStr = json['provider'] as String? ?? 'compatible';
    final provider = AiProviderType.values.firstWhere(
      (p) => p.name.toLowerCase() == providerStr.toLowerCase(),
      orElse: () => AiProviderType.compatible,
    );
    return AiConfigFile(
      provider: provider,
      endpoint: (json['endpoint'] as String? ?? '').trim(),
      model: (json['model'] as String? ?? '').trim(),
      apiKey: json['apiKey'] as String?,
      description: json['description'] as String?,
    );
  }

  factory AiConfigFile.parse(String rawJson) {
    final data = jsonDecode(rawJson) as Map<String, dynamic>;
    return AiConfigFile.fromJson(data);
  }

  Map<String, dynamic> toJson() => {
    'provider': provider.name,
    'endpoint': endpoint,
    'model': model,
    if (apiKey != null) 'apiKey': apiKey,
    if (description != null) 'description': description,
  };

  static Future<AiConfigFile?> loadFromAsset([
    String path = defaultAssetPath,
  ]) async {
    try {
      final content = await rootBundle.loadString(path);
      return AiConfigFile.parse(content);
    } catch (_) {
      return null;
    }
  }

  AiConfigFile copyWith({
    AiProviderType? provider,
    String? endpoint,
    String? model,
    String? apiKey,
    String? description,
  }) => AiConfigFile(
    provider: provider ?? this.provider,
    endpoint: endpoint ?? this.endpoint,
    model: model ?? this.model,
    apiKey: apiKey ?? this.apiKey,
    description: description ?? this.description,
  );
}