using UnityEngine;
using System.Collections;

/// <summary>
/// This singleton is responsible for keeping an instance of System.Random which we can reset to a specific seed.
/// This is important for replaying the exact same sequence of pseudo-random numbers.
/// </summary>
public class RandomSingleton
{
	#region Singleton
	private static RandomSingleton instance;
	public static RandomSingleton Instance
	{
		get
		{
			if (instance == null)
			{
				instance = new RandomSingleton();
			}
			return instance;
		}
	}
	#endregion

	System.Random _random;

	RandomSingleton()
	{
		SetSeed(0);
	}

	public void SetSeed(int seed)
	{
		AVDebug.Log("Random Singleton Seed set to "+seed);
		_random = new System.Random(seed);
	}

	public int NextInt()
	{
		int r = _random.Next();
		//AVDebug.Log("!!!Got Random int "+r);
		return r;
	}

	public int NextInt(int min, int max)
	{
		AVDebug.Assert(max >= min, "Max must be >= min");
		int range = max - min;
		int r = min + (int)(_random.NextDouble() * range);
		//AVDebug.Log("!!!Got Random int from range "+r);
		return r;
	}

	public float NextFloat()
	{
		float r = (float)_random.NextDouble();
		//AVDebug.Log("!!!Got Random float "+r);
		return r;
	}

	public float NextFloat(float min, float max)
	{
		AVDebug.Assert(max >= min, "Max must be >= min");
		float range = max - min;
		float r = min + (float)(_random.NextDouble() * range);
		//AVDebug.Log("!!!Got Random float from range "+r);
		return r;
	}

}