class TaskModel {
  final DateTime assignmentDate;
  final DateTime? reportedDate;
  final String id;
  final WorkItem? workItem;
  final String workItemId;
  final int plannedTask;
  final int completedTask;
  final AssignedBy assignedBy;
  final List<TeamMember> teamMembers;
  final List<Comment> comments;

  TaskModel({
    required this.assignmentDate,
    this.reportedDate, 
    required this.id,
    required this.workItem,
    required this.workItemId,
    required this.plannedTask,
    required this.completedTask,
    required this.assignedBy,
    required this.teamMembers,
    required this.comments,
  });

  factory TaskModel.fromJson(Map<String, dynamic> json) {
    return TaskModel(
      assignmentDate: DateTime.parse(json['assignmentDate']),
      reportedDate: json['reportedDate'] != null
          ? DateTime.tryParse(json['reportedDate']) 
          : null,
      id: json['id'],
      workItem:
          json['workItem'] != null ? WorkItem.fromJson(json['workItem']) : null,
      workItemId: json['workItemId'],
      plannedTask: json['plannedTask'],
      completedTask: json['completedTask'],
      assignedBy: AssignedBy.fromJson(json['assignedBy']),
      teamMembers: (json['teamMembers'] as List)
          .map((e) => TeamMember.fromJson(e))
          .toList(),
      comments:
          (json['comments'] as List).map((e) => Comment.fromJson(e)).toList(),
    );
  }
}

class WorkItem {
  final String? id;
  final ActivityMaster? activityMaster;
  final WorkArea? workArea;
  final int? plannedWork;
  final int? completedWork;

  WorkItem({
    this.id,
    this.activityMaster,
    this.workArea,
    this.plannedWork,
    this.completedWork,
  });

  factory WorkItem.fromJson(Map<String, dynamic> json) {
    return WorkItem(
      id: json['id']?.toString(),
      activityMaster: json['activityMaster'] != null
          ? ActivityMaster.fromJson(json['activityMaster'])
          : null,
      workArea:
          json['workArea'] != null ? WorkArea.fromJson(json['workArea']) : null,
      plannedWork: json['plannedWork'],
      completedWork: json['completedWork'],
    );
  }
}

class ActivityMaster {
  final String activityName;

  ActivityMaster({required this.activityName});

  factory ActivityMaster.fromJson(Map<String, dynamic> json) {
    return ActivityMaster(activityName: json['activityName'] ?? '');
  }
}

class WorkArea {
  final String areaName;
  final Floor? floor;

  WorkArea({required this.areaName, this.floor});

  factory WorkArea.fromJson(Map<String, dynamic> json) {
    return WorkArea(
      areaName: json['areaName'] ?? '',
      floor: json['floor'] != null ? Floor.fromJson(json['floor']) : null,
    );
  }
}

class Floor {
  final String floorName;
  final Building? building;

  Floor({required this.floorName, this.building});

  factory Floor.fromJson(Map<String, dynamic> json) {
    return Floor(
      floorName: json['floorName'] ?? '',
      building:
          json['building'] != null ? Building.fromJson(json['building']) : null,
    );
  }
}

class Building {
  final String name;

  Building({required this.name});

  factory Building.fromJson(Map<String, dynamic> json) {
    return Building(name: json['name'] ?? '');
  }
}

class AssignedBy {
  final String id;
  final String firstName;
  final String? lastName;

  AssignedBy({
    required this.id,
    required this.firstName,
    this.lastName,
  });

  factory AssignedBy.fromJson(Map<String, dynamic> json) {
    return AssignedBy(
      id: json['id']?.toString() ?? '',
      firstName: json['firstName'] ?? '',
      lastName: json['lastName'],
    );
  }
}

class TeamMember {
  final String id;
  final String firstName;
  final String? lastName;

  TeamMember({
    required this.id,
    required this.firstName,
    this.lastName,
  });

  factory TeamMember.fromJson(Map<String, dynamic> json) {
    return TeamMember(
      id: json['id']?.toString() ?? '',
      firstName: json['firstName']?.toString() ?? '',
      lastName: json['lastName']?.toString(),
    );
  }
}

class Comment {
  final String comment;
  final TeamMember commentedBy;
  final DateTime timestamp;

  Comment({
    required this.comment,
    required this.commentedBy,
    required this.timestamp,
  });

  factory Comment.fromJson(Map<String, dynamic> json) {
    return Comment(
      comment: json['comment']?.toString() ?? '',
      commentedBy: json['employee'] != null
          ? TeamMember.fromJson(json['employee'])
          : TeamMember(id: '', firstName: '', lastName: null),
      timestamp: DateTime.parse(json['commentDate'] ?? ''),
    );
  }
}