using System.Collections.Generic;
using Godot;

public static class ResourceDistributor
{
	public static Dictionary<string, Texture2D> resources = ResourceLoader.LoadResourceSymbols();
	public static Dictionary<string, float[]> weights = ResourceLoader.LoadResourceWeights();

	public static string GetResource(int layer)
	{
		return ChooseWeighted(layer);
	}

	private static string ChooseWeighted(int layer)
	{
		float totalWeight = 0f;

		foreach (string resource in resources.Keys)
		{
			totalWeight += GetWeight(resource, layer);
		}

		float randomWeight = (float)(GameData.rand.NextDouble() * totalWeight);
		float cumulative = 0f;

		foreach (string resource in resources.Keys)
		{
			cumulative += GetWeight(resource, layer);

			if (randomWeight <= cumulative) return resource;
		}

		return "stone";
	}

	private static float GetWeight(string resource, int layer)
	{
		return Mathf.Lerp(weights[resource][0], weights[resource][1], layer);
	}
}