using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using System;

public static class VesselExtension
{

    public static bool IsNullOrEmpty<T>(this List<T> vessel)
    {
        return vessel == null || vessel.Count == 0;
    }

    public static bool IsNullOrEmpty<T>(this T[] vessel)
    {
        return vessel == null || vessel.Length == 0;
    }

    public static bool IsNullOrEmpty<T0, T1>(this Dictionary<T0, T1> dictionary)
    {
        return dictionary == null || dictionary.Count == 0;
    }

    public static T GetFirst<T>(this List<T> list)
    {
        if (list == null)
        {
            throw new ArgumentNullException("List is null.");
        }

        if (list.Count == 0)
        {
            Debug.Log("List count can't be zero.");
            return default(T);
        }

        return list[0];
    }

    public static T GetLast<T>(this List<T> list)
    {
        if (list == null)
        {
            throw new ArgumentNullException("List is null.");
        }

        if (list.Count == 0)
        {
            Debug.Log("List count can't be zero.");
            return default(T);
        }

        return list[list.Count - 1];
    }

    public static T GetFirst<T>(this T[] list)
    {
        if (list == null)
        {
            throw new ArgumentNullException("Array is null.");
        }

        if (list.Length == 0)
        {
            Debug.Log("Array count can't be zero.");
            return default(T);
        }

        return list[0];
    }

    public static T GetLast<T>(this T[] list)
    {
        if (list == null)
        {
            throw new ArgumentNullException("Array is null.");
        }

        if (list.Length == 0)
        {
            Debug.Log("Array count can't be zero.");
            return default(T);
        }

        return list[list.Length - 1];
    }

    public static T GetRandom<T>(this List<T> list)
    {
        if (list == null)
        {
            throw new ArgumentNullException("List is null.");
        }

        if (list.Count == 0)
        {
            Debug.Log("List count can't be zero.");
            return default(T);
        }

        var randomIndex = UnityEngine.Random.Range(0, list.Count);
        return list[randomIndex];
    }

}