public class GameResource
{
	private const float NormalExtractionSpeed = 1f;
	private const float EndlessExtractionSpeed = 4f;

	public string name;
	public ItemData item;

	private int currentAmount;
	private int maxAmount;
	private bool isEndless;
	private float extractionSpeed;
	private double timeSinceLastExtraction;

	public GameResource(string name)
	{
		this.name = name;
		maxAmount = GameData.rand.Next(1000, 10000);
		currentAmount = maxAmount;
		isEndless = false;
		extractionSpeed = NormalExtractionSpeed;
		item = GameData.availableItems[name];
	}

	public static GameResource FromSaveData(ResourceSaveData saveData)
	{
		GameResource resource = new GameResource(saveData.Name)
		{
			currentAmount = saveData.CurrentAmount,
			maxAmount = saveData.MaxAmount,
			isEndless = saveData.IsEndless,
			extractionSpeed = saveData.ExtractionSpeed,
			timeSinceLastExtraction = saveData.TimeSinceLastExtraction
		};
		resource.NormalizeExtractionSpeed();
		return resource;
	}

	public ResourceSaveData CreateSaveData()
	{
		return new ResourceSaveData
		{
			Name = name,
			CurrentAmount = currentAmount,
			MaxAmount = maxAmount,
			IsEndless = isEndless,
			ExtractionSpeed = extractionSpeed,
			TimeSinceLastExtraction = timeSinceLastExtraction
		};
	}

	public bool Extract(double delta)
	{
		timeSinceLastExtraction += delta;
		if (timeSinceLastExtraction < extractionSpeed) return false;

		timeSinceLastExtraction = 0;
		if (isEndless) return true;

		if (currentAmount <= 0) return false;

		currentAmount--;
		return true;
	}

	public bool CanExtract()
	{
		return (isEndless || currentAmount > 0)
			&& GameData.availableResearch[item.Research].state == ResearchState.RESEARCHED;
	}

	public void MakeEndless()
	{
		isEndless = true;
		extractionSpeed = EndlessExtractionSpeed;
	}

	public bool IsEndless()
	{
		return isEndless;
	}

	public float GetExtractionSpeed()
	{
		return extractionSpeed;
	}

	private void NormalizeExtractionSpeed()
	{
		if (!isEndless) return;
		if (extractionSpeed > NormalExtractionSpeed) return;

		extractionSpeed = EndlessExtractionSpeed;
	}
}