import 'package:fis_jsonrpc/utils.dart';

class JsonRpcRequest {
  static const String _serverVersion = '2.0';

  final String method;
  final Object? args;
  final bool notify;

  int? get id => !this.notify ? this.hashCode : null;

  JsonRpcRequest(this.method, this.args, {this.notify = false});

  Map<String, dynamic> toJson() {
    var map = <String, dynamic>{};
    map = {
      'jsonrpc': _serverVersion,
      'method': method,
      'params': _buildParams(),
    };
    if (!notify) map['id'] = id;
    return map;
  }

  bool _isComplexType(dynamic v) {
    if (v is String) return false;
    if (v is num) return false;
    if (v is bool) return false;
    if (v is Symbol) return false;
    if (v is List) return false;
    if (v is Map) return false;
    if (v is Set) return false;
    return true;
  }

  dynamic _doComplexValToJson(dynamic v) {
    if (v is DateTime) {
      return JsonRpcUtils.dateFormat(v);
    }
    dynamic fn;
    try {
      fn = v.toJson;
    } catch (e) {
      try {
        final idx = v.index;
        fn = () => idx;
      } catch (e) {
        fn = () => null;
      }
    }
    return fn();
  }

  List _buildListParams() {
    final arr = (args as List);
    for (var i = 0; i < arr.length; i++) {
      final v = arr[i];
      if (_isComplexType(v)) {
        arr[i] = _doComplexValToJson(v);
      }
    }
    return arr;
  }

  Map _buildMapParams() {
    final map = (args as Map);
    map.forEach((k, v) {
      if (_isComplexType(v)) {
        map[k] = _doComplexValToJson(v);
      }
    });
    return map;
  }

  List _buildSetParams() {
    final set = (args as Set);
    final arr = [];
    set.forEach((v) {
      if (_isComplexType(v)) {
        arr.add(_doComplexValToJson(v));
      } else {
        arr.add(v);
      }
    });
    return arr;
  }

  dynamic _buildParams() {
    if (args == null) return [];
    if (args is List) {
      return _buildListParams();
    }
    if (args is Map) {
      return _buildMapParams();
    }
    if (args is Set) {
      return _buildSetParams();
    }
    return [args];
  }

  @override
  String toString() => 'JsonRpcRequest: ${toJson()}';
}