using System;
using System.IO;
using Newtonsoft.Json.Linq;

namespace Luneraria.EditorTools
{
    /// <summary>
    /// The world bake of tools/godot-golden/world_export.gd: g1_world.json (structure, transforms,
    /// materials) and g1_world.bytes (little-endian arrays referenced as [offset, count]).
    /// </summary>
    public sealed class LuneWorldBake
    {
        public const string Folder = "Assets/Luneraria/World/Bake";
        public readonly JObject Data;
        readonly byte[] _blob;

        LuneWorldBake(JObject data, byte[] blob)
        {
            Data = data;
            _blob = blob;
        }

        public static LuneWorldBake Load(string folder = Folder)
        {
            return new LuneWorldBake(JObject.Parse(File.ReadAllText(Path.Combine(folder, "g1_world.json"))), File.ReadAllBytes(Path.Combine(folder, "g1_world.bytes")));
        }

        public float[] Floats(JToken reference, int components = 1)
        {
            int offset = (int)reference[0];
            int count = (int)reference[1] * components;
            var values = new float[count];
            Buffer.BlockCopy(_blob, offset, values, 0, count * 4);
            return values;
        }

        public int[] Ints(JToken reference)
        {
            int offset = (int)reference[0];
            int count = (int)reference[1];
            var values = new int[count];
            Buffer.BlockCopy(_blob, offset, values, 0, count * 4);
            return values;
        }

        public static float[] Transform(JToken values)
        {
            var result = new float[12];
            for (int i = 0; i < 12; i++)
                result[i] = (float)values[i];
            return result;
        }
    }
}