public class GameResource
{
    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 = 1f;
        item = GameData.availableItems[name];
    }

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

        return false;
    }

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