using System.Threading;
using System.Threading.Tasks;
using Godot;

public partial class GameManager : Node
{
    [Export] Player player;

    [Export] double closeTickInterval = 1;
    [Export] double farTickInterval = 10;
    [Export] int maxFarThreads = 16;

    public static GameManager Singleton { get; private set; }
    public IGenerator Generator { get; private set; }

    public Universe GameUniverse { get; private set; }
    public Sector CurrentSector { get; private set; }

    private double closeTickTimer = 0;
    private double farTickTimer = 0;

    public override void _Ready()
    {
        Singleton = this;

        Generator = new TestGenerator();
        Generator.GenerateUniverse((universe) =>
        {
            GameUniverse = universe;
            CurrentSector = universe.Sectors[1, 1, 1];
        });
    }

    public override void _Process(double delta)
    {
        closeTickTimer += delta;
        farTickTimer += delta;

        if (closeTickTimer >= closeTickInterval)
        {
            SimulateClose(closeTickTimer);
            closeTickTimer = 0;
        }

        if (farTickTimer >= farTickInterval)
        {
            SimulateFar(farTickTimer);
            farTickTimer = 0;
        }
    }

    private void SimulateClose(double delta)
    {
        Vector3I currentCoordinates = CurrentSector.Coordinates;

        Sector[,,] sectors = GameUniverse.Sectors;

        int sizeX = sectors.GetLength(0);
        int sizeY = sectors.GetLength(1);
        int sizeZ = sectors.GetLength(2);

        int startX = Mathf.Clamp(currentCoordinates.X - 1, 0, sizeX);
        int startY = Mathf.Clamp(currentCoordinates.Y - 1, 0, sizeY);
        int startZ = Mathf.Clamp(currentCoordinates.Z - 1, 0, sizeZ);

        int endX = Mathf.Clamp(currentCoordinates.X + 1, 0, sizeX);
        int endY = Mathf.Clamp(currentCoordinates.Y + 1, 0, sizeY);
        int endZ = Mathf.Clamp(currentCoordinates.Z + 1, 0, sizeZ);

        for (int x = startX; x <= endX; x++)
        {
            for (int y = startY; y <= endY; y++)
            {
                for (int z = startZ; z <= endZ; z++)
                {
                    int taskX = x;
                    int taskY = y;
                    int taskZ = z;

                    Task.Run(() =>
                    {
                        sectors[taskX, taskY, taskZ].Simulate(delta);
                    });
                }
            }
        }
    }

    private void SimulateFar(double delta)
    {
        Sector[,,] sectors = GameUniverse.Sectors;

        int sizeX = sectors.GetLength(0);
        int countX = Mathf.Clamp(sizeX / maxFarThreads, 1, int.MaxValue);

        for (int x = 0; x < sizeX; x += countX)
        {
            double taskDelta = delta;
            int taskStartX = x;
            int taskCountX = countX;

            _ = SimulateFarThreaded(taskDelta, taskStartX, taskCountX);
        }
    }

    private async Task SimulateFarThreaded(double delta, int startX, int countX)
    {
        Vector3I currentCoordinates = CurrentSector.Coordinates;

        Sector[,,] sectors = GameUniverse.Sectors;

        int sizeX = sectors.GetLength(0);
        int sizeY = sectors.GetLength(1);
        int sizeZ = sectors.GetLength(2);

        int startSkipX = Mathf.Clamp(currentCoordinates.X - 1, 0, sizeX);
        int startSkipY = Mathf.Clamp(currentCoordinates.Y - 1, 0, sizeY);
        int startSkipZ = Mathf.Clamp(currentCoordinates.Z - 1, 0, sizeZ);

        int endSkipX = Mathf.Clamp(currentCoordinates.X + 1, 0, sizeX);
        int endSkipY = Mathf.Clamp(currentCoordinates.Y + 1, 0, sizeY);
        int endSkipZ = Mathf.Clamp(currentCoordinates.Z + 1, 0, sizeZ);

        int endX = Mathf.Clamp(startX + countX, 0, sizeX);

        for (int x = startX; x < endX; x++)
        {
            for (int y = 0; y < sizeY; y++)
            {
                for (int z = 0; z < sizeZ; z++)
                {
                    if (Helpers.IsBetweenInclusive(x, startSkipX, endSkipX))
                    {
                        if (Helpers.IsBetweenInclusive(y, startSkipY, endSkipY))
                        {
                            if (Helpers.IsBetweenInclusive(z, startSkipZ, endSkipZ))
                            {
                                continue;
                            }
                        }
                    }

                    sectors[x, y, z].Simulate(delta);
                }
            }
        }
    }
}