using System;
using System.Collections.Generic;

namespace Graph
{
    public class Graph<T> where T : IComparable<T>
    {
        public List<Vertex<T>> Vertices { get; set; } = new List<Vertex<T>>();

        public Graph() { }

        public Graph(List<Vertex<T>> vertices)
        {
            Vertices = vertices;
        }

        public void AddEdge(Edge<T> edge)
        {
            Vertex<T> vertex = Vertices.Find(u => u.Id == edge.U);

            if (vertex == null) {
                Vertices.Add(vertex = new Vertex<T>(edge.U));
                vertex = Vertices[Vertices.Count - 1];
            }

            vertex.Edges.Add(edge);
        }

        public override string ToString() => $"{String.Join("\n", Vertices)}";
    }

}