using System;
using System.Data;
using System.Numerics;
using AriasServerUtils;
using Vintagestory.API.Common;
using Vintagestory.API.Common.Entities;
using Vintagestory.API.MathTools;
using Vintagestory.API.Server;
using Vintagestory.GameContent;

public class RTPFactory
{
    /// <summary>
    /// This function searches for a safe position, honoring the max RTP distance in the global configuration
    /// </summary>
    /// <param name="isp">The player to be teleported</param>
    /// <returns>A random position +/- max distance from current position.</returns>
    public static PlayerPosition GetRandomPosition(IServerPlayer isp)
    {
        Random rng = new Random();
        EntityPos vPos = isp.Entity.Pos;
        BlockPos bPos = new BlockPos(isp.Entity.Pos.Dimension);
        IServerWorldAccessor iswa = isp.Entity.World as IServerWorldAccessor;

        int tries = 10;
        PlayerPosition PPos = PlayerPosition.from(isp.Entity);

        while (tries-- > 0)
        {
            // Generate random X and Z within max RTP distance
            bPos.X = (int)vPos.X + rng.Next(-ServerUtilities.config.MaxRTPBlockDistance, ServerUtilities.config.MaxRTPBlockDistance);
            bPos.Z = (int)vPos.Z + rng.Next(-ServerUtilities.config.MaxRTPBlockDistance, ServerUtilities.config.MaxRTPBlockDistance);
            bPos.Y = 255;

            Block lastAboveLast = null;
            Block lastBlock = null;
            Block curBlock;

            // Scan downwards to find a valid landing spot
            for (int i = 255; i > 25; i--)
            {
                bPos.Y = i;
                curBlock = iswa.BlockAccessor.GetBlock(bPos);

                if (curBlock.MatterState == EnumMatterState.Solid)
                {
                    if (lastBlock != null && lastBlock.BlockMaterial == EnumBlockMaterial.Air &&
                        lastAboveLast != null && lastAboveLast.BlockMaterial == EnumBlockMaterial.Air)
                    {
                        // Found a valid spot: curBlock is solid, lastBlock & lastAboveLast are gas (air)
                        PPos.X = bPos.X;
                        PPos.Y = bPos.Y + 1;
                        PPos.Z = bPos.Z;

                        return PPos;
                    }
                }

                lastAboveLast = lastBlock;
                lastBlock = curBlock;
            }
        }

        return null; // Return null if no valid position is found after retries
    }
    public static float GetDistance(Vec2i pos1, Vec2i pos2)
    {
        return MathF.Sqrt(MathF.Pow(pos2.X - pos1.X, 2) + MathF.Pow(pos2.Y - pos1.Y, 2));
    }

}