oc-front/lib/models/workflow.dart

import 'package:flutter/material.dart';
import 'package:flutter_colorpicker/flutter_colorpicker.dart';
import 'package:flutter_flow_chart/flutter_flow_chart.dart';
import 'package:oc_front/models/abstract.dart';
import 'package:oc_front/models/logs.dart';
import 'package:oc_front/models/resources/compute.dart';
import 'package:oc_front/models/resources/data.dart';
import 'package:oc_front/models/resources/processing.dart';
import 'package:oc_front/models/resources/resources.dart';
import 'package:oc_front/models/resources/storage.dart';
import 'package:oc_front/models/resources/workflow.dart';
import 'package:oc_front/models/response.dart';
import 'package:oc_front/widgets/forms/sub_keys_forms.dart';

class Check extends SerializerDeserializer<Check> {
  bool isAvailable = false;

  Check({
    this.isAvailable = false,
  });

  @override deserialize(dynamic json) {
    try { json = json as Map<String, dynamic>;
    } catch (e) { return Check(); }   
    return Check(
      isAvailable: json.containsKey("is_available") ? json["is_available"] : false,
    );
  }
  @override Map<String, dynamic> serialize() {
    return {
      "is_available": isAvailable,
    };
  }
}

class WorkflowExecutions extends SerializerDeserializer<WorkflowExecutions> {
  List<WorkflowExecution> executions = [];
  
  WorkflowExecutions({
    this.executions = const [],
  });

  @override deserialize(dynamic json) {
    try { json = json as List<dynamic>;
    } catch (e) { return WorkflowExecutions(); }   
    return WorkflowExecutions(
      executions: fromListJson(json, WorkflowExecution()),
    );
  }
  
  @override Map<String, dynamic> serialize() {
    return {};
  }

}

class WorkflowExecution extends SerializerDeserializer<WorkflowExecution> {
  String? id;
  String? name;
  String? startDate;
  String? endDate;
  int? status;
  String? workflowId;

  List<Log>? logs;
  

  WorkflowExecution({
    this.id,
    this.startDate,
    this.status,
    this.workflowId,
    this.name,
    this.endDate,
  });

  @override deserialize(dynamic json) {
    try { json = json as Map<String, dynamic>;
    } catch (e) { return WorkflowExecution(); }   
    return WorkflowExecution(
      id: json.containsKey("id") ? json["id"] : "",
      endDate: json.containsKey("end_date") ? json["end_date"] : "",
      startDate: json.containsKey("execution_date") ? json["execution_date"] : "",
      status: json.containsKey("state") ? json["state"] : 1,
      workflowId: json.containsKey("workflow_id") ? json["workflow_id"] : "",
      name: json.containsKey("name") ? json["name"] : "",
    );
  }
  
  @override Map<String, dynamic> serialize() {
    return {
      "id": id,
      "name": name,
      "end_date": endDate,
      "execution_data": startDate,
      "status": status,
      "workflow_id": workflowId,
    };
  }

}

class Workflow extends SerializerDeserializer<Workflow>  implements ShallowData {
  String? id;
  String? name;
  List<dynamic> data;
  List<dynamic> compute;
  List<dynamic> storage;
  List<dynamic> processing;
  List<dynamic> workflows;
  Graph? graph;
  List<dynamic> shared;

  Workflow({
    this.id,
    this.name = "",
    this.data = const [],
    this.compute = const [],
    this.storage = const [],
    this.processing = const [],
    this.workflows = const [],
    this.graph,
    this.shared = const [],
  });

  @override String getID() => id ?? "";
  @override String getName() => name ?? "";
  String getDescription() => "";

  @override deserialize(dynamic json) {
    try { json = json as Map<String, dynamic>;
    } catch (e) { return Workflow(); }   
    return Workflow(
      id: json.containsKey("id") ? json["id"] : "",
      name: json.containsKey("name") ? json["name"] : "",
      workflows: json.containsKey("workflows") ? json["workflows"] : [],
      processing: json.containsKey("processings") ? json["processings"] : [],
      compute: json.containsKey("computes") ? json["computes"] : [],
      data: json.containsKey("datas") ? json["datas"] : [],
      storage: json.containsKey("storages") ? json["storages"] : [],
      shared: json.containsKey("shared") ? json["shared"] : [],
      graph: json.containsKey("graph") ? Graph().deserialize(json["graph"]) : null,
    );
  }
  @override Map<String, dynamic> serialize() {
    var obj = {
      "id": id,
      "name": name,
      "datas": data,
      "storages": storage,
      "computes" : compute,
      "workflows": workflows,
      "processings": processing,
    };
    if (graph != null) {
      obj["graph"] = graph!.serialize();
    }
    return obj;
  }

  void fromDashboard(Map<String, dynamic> j) {
    id = j["id"];
    name = j["name"];
    if (j.containsKey("graph")) { 
      graph = Graph();
      graph!.fromDashboard(j["graph"]);
    }
  }
  Map<String, dynamic> toDashboard() {
    return {
      "id": id,
      "name": name,
      "shared": shared,
      "graph": graph?.toDashboard(),
    };
  }
}

class Scheduler extends SerializerDeserializer<Scheduler> {
  String? id;
  String? name;
  String? cron;
  DateTime? start;
  DateTime? end;
  int? mode;

  Scheduler({
    this.id,
    this.name,
    this.cron,
    this.start,
    this.end,
    this.mode,
  });

  void fromDashboard(Map<String, dynamic> j) {
    id = j["id"];
    name = j["name"];
    cron = j["cron"];
    mode =j["mode"];
    try {
      start = j["start"] != null ? DateTime.parse(j["start"]) : DateTime.now().add( const Duration(minutes: 1)).toUtc();
      if (start == DateTime.utc(0)) {
        start = DateTime.now().add( const Duration(minutes: 1)).toUtc();
      }
      if (j.containsKey("end") && j["end"] != null) {
        end = DateTime.parse(j["end"]);
      }
      
    } catch (e) { /**/ }
  }
  Map<String, dynamic> toDashboard() {
    return {
      "id": id,
      "name": name,
      "cron": cron,
      "mode": mode ?? 1,
      "start": start?.toIso8601String(),
      "end": end?.toIso8601String(),
    };
  }

  @override deserialize(dynamic json) {
    try { json = json as Map<String, dynamic>;
    } catch (e) { return Scheduler(); }   
    return Scheduler(
      id: json.containsKey("id") ? json["id"] : null,
      name: json.containsKey("name") ? json["name"] : "",
      cron: json.containsKey("cron") ? json["cron"] : "",
      mode: json.containsKey("mode") ? json["mode"] : "",
      start: json.containsKey("start") && json["start"] != null ? DateTime.parse(json["start"]) : null,
      end: json.containsKey("end") && json["end"] != null ? DateTime.parse(json["end"]) : null,
    );
  }
  @override Map<String, dynamic> serialize() {
    try {
      return {
        "id": id,
        "name": name,
        "cron": cron ?? "",
        "mode": mode ?? 1,
        "start": start?.toIso8601String(),
        "end": end?.toIso8601String(),
      };
    } catch (e) {
      return {
        "id": id,
        "name": name,
        "cron": cron ?? "",
        "start": start?.toIso8601String(),
        "end": end?.toIso8601String(),
      };
    }
  }
}

class Graph extends SerializerDeserializer<Graph> {
  double zoom;
  Map<String, GraphItem> items = {};
  List<GraphLink> links = [];

  Graph({
    this.zoom = 1,
    this.items = const {},
    this.links = const [],
  });

  Map<String, List<dynamic>> getInfosToUpdate(SubMapFormsType type) {
      Map<String, List<dynamic>> infos = {};
      for (var item in items.values) {
        var inst = item.getElement()?.getSelectedInstance();
        if (inst == null) { return infos; }
        infos[item.id ?? ""] = (type == SubMapFormsType.INPUT ? inst.inputs : ( 
          type == SubMapFormsType.OUTPUT ? inst.outputs : inst.env)).map( (e) => e.serialize()).toList();
      }
      return infos;
  }

  Map<String, List<dynamic>> getEnvToUpdate() {
      return getInfosToUpdate(SubMapFormsType.ENV);
  }

  Map<String, List<dynamic>> getInputToUpdate() {
      return getInfosToUpdate(SubMapFormsType.INPUT);
  }

  Map<String, List<dynamic>> getOutputToUpdate() {
      return getInfosToUpdate(SubMapFormsType.OUTPUT);
  }


    GraphItem getItemByElementID(String id) {
      return items[id] ?? GraphItem();
    }
  Map<String,GraphItem?> getArrowByElementID(String id) {
    Map<String,GraphItem?> arr = {};
    for (var link in links) {
      var nested = false;
      var reverse = false;
      String? from = link.source?.id;
      String? to = link.destination?.id;
      bool isInLink = (from?.contains(id) ?? false) || (to?.contains(id) ?? false);
      if (isInLink && (["storage", "compute"].contains(getItemByElementID(from ?? "").getElement()?.getType()) 
      || ["storage", "compute"].contains(getItemByElementID(to ?? "").getElement()?.getType()))) {
        nested = true;
        reverse = link.source?.id?.contains(id) ?? false;
      }
      if (nested || isInLink) {
          arr[reverse ? (to ?? "") : (from ?? "") ] = getItemByElementID(reverse ? (to ?? "") : (from ?? "") );
      }
    }
    return arr;
  }

  void fillEnv(AbstractItem? mainItem, GraphItem? item, SubMapFormsType type, Map<String,int> alreadySeen) {
    if (mainItem == null || item == null) {
      return;
    }
    AbstractItem? el = item.getElement();
    if (el?.getSelectedInstance() == null) {
      return;
    }
    var inst = el!.getSelectedInstance()!;
    
    var inst2 = mainItem.getSelectedInstance()!;
    var what = type == SubMapFormsType.INPUT ? inst.inputs : ( 
      type == SubMapFormsType.OUTPUT ? inst.outputs : inst.env);
    var what2 = type == SubMapFormsType.INPUT ? inst2.inputs : ( 
      type == SubMapFormsType.OUTPUT ? inst2.outputs : inst2.env);
    for (var e in what2) {
      if (e.attr != null && e.value == null) {
        e.value = inst2.serialize()[e.attr!];
      }
    }
    // should find arrow env info and add it to the env
    List<Param> extParams = [];
    var arrows = links.where( (e) => (e.source?.id?.contains(item.id ?? "") ?? false) || (e.destination?.id?.contains(item.id ?? "") ?? false));
    for (var arrow in arrows) {
      for (var info in arrow.infos) {
        var i = info as Map<String, dynamic>;
        for (var entry in i.entries) {
          if (entry.value == null) { continue; }

          var varName =  "LINK_${el.getName().toUpperCase().replaceAll(" ", "_")}_${entry.key.toUpperCase()}";
          /*alreadySeen[varName] = (alreadySeen[varName] ?? -1) + 1;
          if ((alreadySeen[varName] ?? 0) > 1) {
            varName = "${varName}_${alreadySeen[varName]}";
          }*/
          if ((entry.value is String) && !isEnvAttr(entry.value, what2)) {
            extParams.add(Param( name: varName,
              attr: entry.key, value: entry.value, origin: item.id, readOnly: true));
          }
        }
      }
    }
    for ( var param in what) {
      if (param.attr == null) { continue; }
      var varName = param.name != null && (param.name!.contains("LINK_") 
            || param.name!.contains("DATA_")
            || param.name!.contains("PROCESSING_")
            || param.name!.contains("STORAGE_")
            || param.name!.contains("WORKFLOW_")
            || param.name!.contains("COMPUTE") ) ? param.name : "${el.topic.toUpperCase()}_${el.getName().toUpperCase().replaceAll(" ", "_")}_${param.attr!.toUpperCase()}";
      /*alreadySeen[varName] = (alreadySeen[varName] ?? -1) + 1;
      if ((alreadySeen[varName] ?? 0) > 0) {
        varName = "${varName}_${alreadySeen[varName]}";
      }*/
      dynamic env;
      if (param.value == null) { 
        var s =  el.serialize();
        s.addAll(el.getSelectedInstance()?.serialize() ?? {});
        env = s[param.attr!];
      } else {
        env = param.value;
      }
      // bool isSrc = param.origin == null;
      //if (isSrc) { continue; }
      if (!isEnvAttr(env, what2)) {
        extParams.add(Param( name: varName,
          attr: param.attr, value: env, origin: item.id, readOnly: true));
      }
    }
    for (var param in extParams) {
      what2.add(param);
    }
  }

  bool isEnvAttr(String value, List<Param> params) {
    for (var e in params) {
      if (value == e.value) { return true; }
    }
    return false;
  }

  void fill() {
    Map<String, int> alreadySeen = {};
    var its = items.values.toList();
    for (var type in [SubMapFormsType.INPUT, SubMapFormsType.OUTPUT, SubMapFormsType.ENV]) {
      for (var item in its) {
        var envs = type == SubMapFormsType.INPUT ? item.getElement()?.getSelectedInstance()?.inputs : (
          type == SubMapFormsType.OUTPUT ? item.getElement()?.getSelectedInstance()?.outputs : item.getElement()?.getSelectedInstance()?.env);
        if (envs != null) {
            envs.removeWhere( (e) => e.readOnly && e.name != null 
            && (e.name!.contains("LINK_") 
            || e.name!.contains("DATA_")
            || e.name!.contains("PROCESSING_")
            || e.name!.contains("STORAGE_")
            || e.name!.contains("WORKFLOW_")
            || e.name!.contains("COMPUTE") ));
        }
      }
      for (var item in [...its, ...its.reversed]) {
        var itss = getArrowByElementID(item.id ?? "");
        for (var i in itss.values) {
          fillEnv(item.getElement(), i, type, alreadySeen);
        }
      }
    }
  }

  void fromDashboard(Map<String, dynamic> j) {
    items = {};
    for (var el in (j["elements"] as Map<dynamic, dynamic>).values) {
      var d = GraphItem();
      d.fromDashboard(el as Map<String, dynamic>);
      items[d.id ?? ""] = d;
    }
    links = (j["arrows"] as List<dynamic>).map( (el) {
      var d = GraphLink();
      d.fromDashboard(el);
      return d;
    }).toList();
    j["zoom"] = zoom;
    fill();
  }

  Map<String, dynamic> toDashboard() {
    fill();
    List<Map<String, dynamic>> elements = [];
    List<Map<String, dynamic>> arrows = [];
    for (var el in items.values) {
      elements.add(el.toDashboard());
    }
    for (var l in links) {
      arrows.add(l.toDashboard());
    }
    return {
      "zoom": zoom,
      "elements": elements,
      "arrows": arrows,
    };
  }

  @override deserialize(dynamic json) {
    try { json = json as Map<String, dynamic>;
    } catch (e) { return Graph(); }   
    var g =  Graph(
      zoom: json.containsKey("zoom") ? double.parse(json["zoom"].toString()) : 0,
      links: json.containsKey("links") ? fromListJson(json["links"], GraphLink()) : [],
      items: json.containsKey("items") ? fromMapJson<GraphItem>(json["items"], GraphItem()) : {},
    );
    g.fill();
    return g;
  }
  @override Map<String, dynamic> serialize() {
    fill();
    return {
      "zoom": zoom,
      "items": toMapJson(items),
      "links": toListJson(links),
    };
  }
}

class StorageProcessingGraphLink extends SerializerDeserializer<StorageProcessingGraphLink> {
  bool write = false;
  String? source;
  String? destination;
  String? filename;

  StorageProcessingGraphLink({
    this.write = false,
    this.source,
    this.destination,
    this.filename,
  });

  @override deserialize(dynamic json) {
    try { json = json as Map<String, dynamic>;
    } catch (e) { return StorageProcessingGraphLink(); }   
    return StorageProcessingGraphLink(
      write: json.containsKey("write") ? json["write"] : false,
      source: json.containsKey("source") ? json["source"] : "",
      destination: json.containsKey("destination") ? json["destination"] : "",
      filename: json.containsKey("filename") && json["filename"] != null ? json["filename"] : "",
    );
  }
  @override Map<String, dynamic> serialize() {
    return {
      "write": write,
      "source": source,
      "destination": destination,
      "filename": filename,
    };
  }
}

class GraphLink extends SerializerDeserializer<GraphLink> {
  Position? source;
  Position? destination;
  GraphLinkStyle? style;
  List<StorageProcessingGraphLink> infos = [];
  List<Param> env = [];

  GraphLink({
    this.source,
    this.destination,
    this.style,
    this.infos = const [],
    this.env = const [],
  });

  void fromDashboard(Map<String, dynamic> j) {
    source = Position(id: j["from"]["id"], x: j["from"]["x"], y: j["from"]["y"]);
    destination = Position(id: j["to"]["id"], x: j["to"]["x"], y: j["to"]["y"]);
    style = GraphLinkStyle();
    style!.fromDashboard(j["params"]);
    infos = fromListJson(j["infos"], StorageProcessingGraphLink());
    env = fromListJson(j["env"], Param());
  }

  Map<String, dynamic> toDashboard() {
    return {
      "from": {
        "id": source?.id ?? "",
        "x" : source?.x  ?? 0,
        "y": source?.y ?? 0,
      },
      "to": {
        "id": destination?.id ?? "",
        "x" : destination?.x  ?? 0,
        "y": destination?.y ?? 0,
      },
      "params": style?.toDashboard(),
      "infos":  toListJson(infos),
      "env": env.map( (el) => el.serialize()).toList(),
    };
  }

  @override deserialize(dynamic json) {
    try { json = json as Map<String, dynamic>;
    } catch (e) { return GraphLink(); }   
    return GraphLink(
      source: json.containsKey("source") && json["source"] != null  ? Position().deserialize(json["source"]) : null,
      destination: json.containsKey("destination") && json["destination"] != null  ? Position().deserialize(json["destination"]) : null,
      style: json.containsKey("style") && json["style"] != null  ? GraphLinkStyle().deserialize(json["style"]) : null,
      infos: json.containsKey("storage_link_infos") && json["storage_link_infos"] != null ? fromListJson(json["storage_link_infos"], StorageProcessingGraphLink()) : [],
      env: json.containsKey("env") && json["env"] != null ? fromListJson(json["env"], Param()) : [],
    );
  }
  @override Map<String, dynamic> serialize() {
    var obj = <String, dynamic>{};
    if (source != null) {
      obj["source"] = source!.serialize();
    }
    if (destination != null) {
      obj["destination"] = destination!.serialize();
    }
    if (style != null) {
      obj["style"] = style!.serialize();
    }
    obj["storage_link_infos"] = toListJson(infos);
    obj["env"] = toListJson(env);
    return obj;
  }
}

class GraphLinkStyle extends SerializerDeserializer<GraphLinkStyle> {
  Color color = Colors.black;
  double stroke = 1;
  double tension = 23;
  double headRadius = 10;
  double dashWidth = 0;
  double dashSpace = 0;
  double startArrowWidth = 1;
  double endArrowWidth = 10;
  Position? startArrow;
  Position? endArrow;
  ArrowStyle arrowStyle = ArrowStyle.curve;
  ArrowDirection arrowDirection = ArrowDirection.forward;

  GraphLinkStyle({
    this.color = Colors.black,
    this.stroke = 1,
    this.tension = 23,
    this.headRadius = 10,
    this.dashWidth = 0,
    this.dashSpace = 0,
    this.startArrowWidth = 10,
    this.endArrowWidth = 10,
    this.startArrow,
    this.endArrow,
    this.arrowStyle = ArrowStyle.curve,
    this.arrowDirection = ArrowDirection.forward
  });

  void fromDashboard(Map<String, dynamic> j) {
    dashSpace = j["dash_space"];
    dashWidth = j["dash_width"];
    endArrowWidth = j["backward_arrow_width"];
    startArrowWidth = j["forward_arrow_width"];
    stroke = j["thickness"];
    arrowDirection = ArrowDirection.values.firstWhere((element) => element.index == j["direction"]);
    headRadius = j["head_radius"];
    color = Color(j["color"]);
    arrowStyle = ArrowStyle.values.firstWhere((element) => element.index == j["arrow_style"]);
    tension = j["tension"];
    startArrow = Position(x: j["start_arrow_position_x"], y: j["start_arrow_position_y"]);
    endArrow = Position(x: j["end_arrow_position_x"], y: j["end_arrow_position_y"]);
  }

  Map<String, dynamic> toDashboard() {
    return {
      "dash_space": dashSpace,
      "dash_width": dashWidth,
      "backward_arrow_width": endArrowWidth,
      "forward_arrow_width": startArrowWidth,
      "thickness": stroke,
      "direction": arrowDirection.index,
      "head_radius": headRadius,
      "tail_length": 25.0,
      "color": int.parse(color.toHexString(), radix: 16),
      "arrow_style" : arrowStyle.index,
      "tension" : tension,
      "start_arrow_position_x": startArrow?.x ?? 0,
      "start_arrow_position_y": startArrow?.y ?? 0,
      "end_arrow_position_x": endArrow?.x ?? 0,
      "end_arrow_position_y": endArrow?.y ?? 0,
    };
  }

  @override deserialize(dynamic json) {
    try { json = json as Map<String, dynamic>;
    } catch (e) { return GraphLinkStyle(); }   
    return GraphLinkStyle(
      color: json.containsKey("color") ? Color(json["color"] as int) : Colors.black,
      stroke: json.containsKey("stroke") ? double.parse(json["stroke"].toString()) : 0,
      tension: json.containsKey("tension") ? double.parse(json["tension"].toString()) : 0,
      headRadius: json.containsKey("head_radius") ? double.parse(json["head_radius"].toString()) : 0,
      dashWidth: json.containsKey("dash_width") ? double.parse(json["dash_width"].toString()) : 0,
      dashSpace: json.containsKey("dash_space") ? double.parse(json["dash_space"].toString()) : 0,
      startArrow: json.containsKey("start_arrow") ? Position().deserialize(json["start_arrow"]) : null,
      endArrow: json.containsKey("end_arrow") ? Position().deserialize(json["end_arrow"]) : null,
      arrowDirection: json.containsKey("arrow_direction") ? ArrowDirection.values.firstWhere((el) => el.index == json["arrow_direction"]) : ArrowDirection.forward,
      arrowStyle: json.containsKey("arrow_style") ? ArrowStyle.values.firstWhere((el) => el.index == json["arrow_style"]) : ArrowStyle.curve,
      startArrowWidth: json.containsKey("start_arrow_width") ? double.parse(json["start_arrow_width"].toString()) : 0,
      endArrowWidth: json.containsKey("end_arrow_width") ? double.parse(json["end_arrow_width"].toString()) : 0,
    );
  }
  @override Map<String, dynamic> serialize() {
    var obj = <String, dynamic> {
      "color" : int.parse(color.toHexString(), radix: 16),
      "stroke" : stroke,
      "tension" : tension,
      "head_radius" : headRadius,
      "dash_width" : dashWidth,
      "dash_space" : dashSpace,
      "arrow_direction" : arrowDirection.index,
      "arrow_style" : arrowStyle.index,
      "start_arrow_width" : startArrowWidth,
      "end_arrow_width" : endArrowWidth,
    };
    if (startArrow != null) {
      obj["start_arrow"] = startArrow!.serialize();
    }
    if (endArrow != null) {
      obj["end_arrow"] = endArrow!.serialize();
    }
    return obj;
  }
}

class GraphItem extends SerializerDeserializer<GraphItem> {
  String? id;
  double? width;
  double? height;
  Position? position;
  DataItem? data;
  ProcessingItem? processing;
  StorageItem? storage;
  ComputeItem? compute;
  WorkflowItem? workflow;

  GraphItem({
    this.id,
    this.width,
    this.height,
    this.position,
    this.data,
    this.processing,
    this.storage,
    this.compute,
    this.workflow,
  });

  AbstractItem? getElement() {
    if (data != null) { return data!; }
    if (processing != null) { return processing!; }
    if (storage != null) { return storage!; }
    if (compute != null) { return compute!; }
    if (workflow != null) { return workflow!; }
    return null;
  }


  void fromDashboard(Map<String, dynamic> j) {
    id = j["id"];
    position = Position(x: j["x"], y: j["y"]);
    width = j["width"];
    height = j["height"];
    
    if (j["element"] != null) {
      if (j["element"]["type"] == "data") {  data = DataItem().deserialize(j["element"]); 
      } else if (j["element"]["type"] == "processing") {  processing = ProcessingItem().deserialize(j["element"]);
      } else if (j["element"]["type"] == "compute") { compute = ComputeItem().deserialize(j["element"]); 
      } else if (j["element"]["type"] == "storage") { storage = StorageItem().deserialize(j["element"]); 
      } else if (j["element"]["type"] == "workflow") { workflow = WorkflowItem().deserialize(j["element"]); 
      } else {
        compute = null;
        data = null;
        processing = null;
        storage = null;
        workflow = null;
      }
    } else {
        compute = null;
        data = null;
        processing = null;
        storage = null;
        workflow = null;
      } 
  }

  Map<String, dynamic> toDashboard() {
    Map<String, dynamic> element = {};
    List<AbstractItem?> items = [data, processing, storage, compute, workflow];
    for(var el in items) {
      if (el != null && el.getID() != "") {
        element = el.serialize();
        break;
      }
    }
    return {
      "id": id,
      "x": (position?.x ?? 0),
      "y": (position?.y ?? 0),
      "width": width ?? 0,
      "height": height ?? 0,
      "element": element, 
    };
  }

  @override deserialize(dynamic json) {
    try { json = json as Map<String, dynamic>;
    } catch (e) { return GraphItem(); }   
    return GraphItem(
      id: json.containsKey("id") ? json["id"] : null,
      width: json.containsKey("width") ? double.parse(json["width"].toString()) : null,
      height: json.containsKey("height") ? double.parse(json["height"].toString()) : null,
      position: json.containsKey("position") ? Position().deserialize(json["position"]) : null,
      data: json.containsKey("data") ? DataItem().deserialize(json["data"]) : null,
      processing: json.containsKey("processing") ? ProcessingItem().deserialize(json["processing"]) : null,
      storage: json.containsKey("storage") ? StorageItem().deserialize(json["storage"]) : null,
      compute: json.containsKey("compute") ? ComputeItem().deserialize(json["compute"]) : null,
      workflow: json.containsKey("workflow") ? WorkflowItem().deserialize(json["workflow"]) : null,
    );
  }
  @override Map<String, dynamic> serialize() { 
    return {
      "id": id,
      "width": width,
      "height": height,
      "data": data?.serialize(),
      "processing": processing?.serialize(),
      "storage": storage?.serialize(),
      "compute": compute?.serialize(),
      "workflow": workflow?.serialize(),
      "position": position?.serialize(),
    };
  }
}

class Position extends SerializerDeserializer<Position> {
  String? id;
  double? x;
  double? y;

  Position({
    this.id,
    this.x,
    this.y,
  });

  @override deserialize(dynamic json) {
    try { json = json as Map<String, dynamic>;
    } catch (e) { return Position(); }   
    return Position(
      id: json.containsKey("id") ? json["id"] : null,
      x: json.containsKey("x") ? double.parse(json["x"].toString()) : null,
      y: json.containsKey("y") ? double.parse(json["y"].toString()) : null,
    );
  }
  @override Map<String, dynamic> serialize() => {
    "id": id,
    "x": x ,
    "y": y,
  };
}