using System;
using System.Collections.Generic;
using System.Collections.ObjectModel;
using System.ComponentModel;
using System.Linq;

namespace PRSDesktop
{
    
    public class DocumentSetNode : INotifyPropertyChanged
    {

        private DocumentSetNodes _owner = null;
        
        public ObservableCollection<DocumentSetNode> Children => _owner.GetChilden(_id);
        
        private Guid _id;
        public Guid ID 
        {
            get { return _id; }
            set
            {
                _id = value;
                RaisedOnPropertyChanged("ID");
            }
        }
        
        private Guid _parent;
        public Guid Parent 
        {
            get { return _parent; }
            set
            {
                _parent = value;
                RaisedOnPropertyChanged("Parent");
            }
        }
        
        private string _description;
        public string Description
        {
            get { return _description; }
            set
            {
                _description = value;
                RaisedOnPropertyChanged("Description");
            }
        }        
        
        private string _details;
        public string Details
        {
            get { return _details; }
            set
            {
                _details = value;
                RaisedOnPropertyChanged("Details");
            }
        }
        
        public Dictionary<String,String> Blocks { get; private set; }
        
        public event PropertyChangedEventHandler PropertyChanged;

        public void RaisedOnPropertyChanged(string propertyName)
        {
            PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(propertyName));
        }

        public DocumentSetNode(DocumentSetNodes owner)
        {
            _owner = owner;
            Blocks = new Dictionary<String,String>();
            foreach (var column in owner.Columns)
                Blocks[column] = "";
        }
        
        public DocumentSetNode(DocumentSetNodes owner, Guid id, Guid parent) : this(owner)
        {
            _id = id;
            _parent = parent;
        }
    }


    public class DocumentSetNodes 
    {

        private List<DocumentSetNode> _nodes = null;

        public ObservableCollection<DocumentSetNode> Nodes => new ObservableCollection<DocumentSetNode>(_nodes.Where(x=>x.Parent == Guid.Empty));

        public IEnumerable<String> Columns { get; private set; }
        
        public DocumentSetNodes(IEnumerable<String> columns)
        {
            _nodes = new List<DocumentSetNode>();
            Columns = columns;
        }

        public DocumentSetNode Add(Guid id, Guid parent)
        {
            var node = new DocumentSetNode(this, id, parent);
            _nodes.Add(node);
            return node;
        }

        public ObservableCollection<DocumentSetNode> GetChilden(Guid id)
        {
            return new ObservableCollection<DocumentSetNode>(_nodes.Where(x => x.Parent.Equals(id) && (x.ID != id)));
        }
  
        public DocumentSetNode? GetNode(Guid id)
        {
            return _nodes.FirstOrDefault(x => x.ID == id);
        }
        
    }
}