using System.Threading.Tasks;
using Godot;

public class TestGenerator : IGenerator
{
	public readonly static Vector3I UNIVERSE_SIZE = new(10, 10, 10);
	public readonly static Vector3 SECTOR_SIZE = new(50, 50, 50);
	public readonly static int STARS_PER_SECTOR = 1;
	public readonly static int STARS_PER_SECTOR_VARIANCE = 0;
	public readonly static int SHIPS_PER_SECTOR = 0;
	public readonly static int SHIPS_PER_SECTOR_VARIANCE = 0;
	public readonly static int STATIONS_PER_SECTOR = 0;
	public readonly static int STATIONS_PER_SECTOR_VARIANCE = 0;

	public Vector3I GetUniverseSize()
	{
		return UNIVERSE_SIZE;
	}

	public Vector3 GetSectorSize()
	{
		return SECTOR_SIZE;
	}

	public static Vector3I GetSectorOffset(Vector3I universeSize)
	{
		return new(
			(int)Mathf.Floor(universeSize.X / 2),
			(int)Mathf.Floor(universeSize.X / 2),
			(int)Mathf.Floor(universeSize.X / 2)
		);
	}

	public static Vector3I GetSectorOffset()
	{
		return GetSectorOffset(UNIVERSE_SIZE);
	}

	public Universe InitializeEmptyUniverse(Vector3I universeSize, Vector3 sectorSize)
	{
		Universe universe = new(universeSize);

		for (int x = 0; x < universeSize.X; x++)
		{
			for (int y = 0; y < universeSize.Y; y++)
			{
				for (int z = 0; z < universeSize.Z; z++)
				{
					universe.Sectors[x, y, z] = new Sector(
						new(x, y, z)
					);
				}
			}
		}

		return universe;
	}

	public Universe GenerateUniverse()
	{
		Universe universe = new(UNIVERSE_SIZE);

		Parallel.For(0, UNIVERSE_SIZE.X, x =>
		{
			GenerateClustered(universe, x);
		});

		return universe;
	}

	private void GenerateClustered(Universe universe, int x)
	{
		RandomNumberGenerator rng = new();
		rng.Randomize();

		for (int y = 0; y < UNIVERSE_SIZE.Y; y++)
		{
			for (int z = 0; z < UNIVERSE_SIZE.Z; z++)
			{
				universe.Sectors[x, y, z] = GenerateSector(new(x, y, z), rng);
			}
		}
	}

	public Sector GenerateSector(Vector3I coordinates, RandomNumberGenerator rng)
	{
		Sector sector = new(coordinates);

		int starCount = rng.RandiRange(
			STARS_PER_SECTOR - STARS_PER_SECTOR_VARIANCE,
			STARS_PER_SECTOR + STARS_PER_SECTOR_VARIANCE
		);
		starCount = Mathf.Clamp(starCount, 0, int.MaxValue);

		for (int i = 0; i < starCount; i++)
		{
			if (coordinates.X == 5 && coordinates.Y == 5 && coordinates.Z == 5)
			{
				Vector3 localCoordinates = GenerateLocalCoordinates(rng);
				Star star = GenerateStar(sector, localCoordinates);

				sector.GameObjects.Add(star);
			}
		}

		int shipCount = rng.RandiRange(
			SHIPS_PER_SECTOR - SHIPS_PER_SECTOR_VARIANCE,
			SHIPS_PER_SECTOR + SHIPS_PER_SECTOR_VARIANCE
		);
		shipCount = Mathf.Clamp(shipCount, 0, int.MaxValue);

		for (int i = 0; i < shipCount; i++)
		{
			Vector3 localCoordinates = GenerateLocalCoordinates(rng);
			Vessel ship = GenerateShip(sector, localCoordinates);

			sector.GameObjects.Add(ship);
		}

		int stationCount = rng.RandiRange(
			STATIONS_PER_SECTOR - STATIONS_PER_SECTOR_VARIANCE,
			STATIONS_PER_SECTOR + STATIONS_PER_SECTOR_VARIANCE
		);
		stationCount = Mathf.Clamp(stationCount, 0, int.MaxValue);

		for (int i = 0; i < stationCount; i++)
		{
			Vector3 localCoordinates = GenerateLocalCoordinates(rng);
			Vessel station = GenerateStation(sector, localCoordinates);

			sector.GameObjects.Add(station);
		}

		return sector;
	}

	public Star GenerateStar(Sector sector, Vector3 localCoordinates)
	{
		return new Star(sector, localCoordinates);
	}

	public Star GenerateStar(Sector sector, RandomNumberGenerator rng)
	{
		return GenerateStar(sector, GenerateLocalCoordinates(rng));
	}

	public Vessel GenerateShip(Sector sector, Vector3 localCoordinates)
	{
		return new Vessel(sector, localCoordinates);
	}

	public Vessel GenerateShip(Sector sector, RandomNumberGenerator rng)
	{
		return GenerateShip(sector, GenerateLocalCoordinates(rng));
	}

	public Vessel GenerateStation(Sector sector, Vector3 localCoordinates)
	{
		return new Vessel(sector, localCoordinates);
	}

	public Vessel GenerateStation(Sector sector, RandomNumberGenerator rng)
	{
		return GenerateStation(sector, GenerateLocalCoordinates(rng));
	}

	public static Vector3 GenerateLocalCoordinates(RandomNumberGenerator rng)
	{
		double x = (rng.Randf() - 0.5) * SECTOR_SIZE.X;
		double y = (rng.Randf() - 0.5) * SECTOR_SIZE.Y;
		double z = (rng.Randf() - 0.5) * SECTOR_SIZE.Z;

		return new(x, y, z);
	}
}