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//#define ENABLE_ASSERTS

using System.Numerics;
using System.Globalization;
using System.Runtime.CompilerServices;
#if ENABLE_ASSERTS
using System.Diagnostics;
#endif

using SharpPluginLoader.Core;
using SharpPluginLoader.Core.Memory;

namespace WorldTuningTool
{
    internal static class Utility
    {
        internal const float defaultParamWidth = 0.21f;
        internal const float fadeAlphaFactor = 0.7f;
        internal const float disableAlphaFactor = 0.6f;

        private static bool loggedAssertFailed = false;
        internal static void Assert(bool condition = false, [CallerLineNumber] int line = 0)
        {
            if (!condition && !loggedAssertFailed)
            {
                Log.Error($"Assert failed on line {line}, further asserts won't be logged.");
                loggedAssertFailed = true;
            }
#if ENABLE_ASSERTS
            Trace.Assert(condition);
#endif
        }

        internal static byte ByteFlag(bool f) { return f ? (byte)0x1 : (byte)0x0; }

        internal static T Get<T>(nint addr, nint offset = 0x0) where T : unmanaged
        {
            return MemoryUtil.Read<T>(addr + offset);
        }

        internal static T Get<T>(long addr, nint offset = 0x0) where T : unmanaged
        {
            return MemoryUtil.Read<T>((nint)addr + offset);
        }

        internal static unsafe T *GetPtrInline<T>(nint addr, nint offset = 0x0) where T : unmanaged
        {
            return (T *)(addr + offset);
        }

        internal static ref T GetRef<T>(nint addr, nint offset = 0x0) where T : unmanaged
        {
            return ref MemoryUtil.GetRef<T>(addr + offset);
        }

        internal static int BitIndex(int mask)
        {
            return BitOperations.Log2((uint)(mask & (-mask)));
        }

        internal static Vector4 ColorVectorFromInt(int c)
        {
            return new Vector4(
                ((c      ) & 0xFF) / 255.0f,
                ((c >> 8 ) & 0xFF) / 255.0f,
                ((c >> 16) & 0xFF) / 255.0f,
                ((c >> 24) & 0xFF) / 255.0f);
        }

        internal static int ColorVectorToInt(Vector4 v)
        {
            return ((int)MathF.Round(v.X * 255.0f)     |
                ((int)MathF.Round(v.Y * 255.0f) << 8)  |
                ((int)MathF.Round(v.Z * 255.0f) << 16) |
                ((int)MathF.Round(v.W * 255.0f) << 24));
        }

        internal static float StringToSingle(string s) { return Convert.ToSingle(s, CultureInfo.InvariantCulture); }
        internal static bool StringToBoolean(string s) { return Convert.ToBoolean(s, CultureInfo.InvariantCulture); }
        internal static int StringToInt32(string s, int fromBase = 10)
        {
            if (fromBase == 10) return Convert.ToInt32(s, CultureInfo.InvariantCulture);
            return Convert.ToInt32(s, fromBase);
        }
        internal static string SingleToString(float f, string? format = null) { return f.ToString(format, CultureInfo.InvariantCulture); }
        internal static string BooleanToString(bool b) { return b.ToString(CultureInfo.InvariantCulture); }
        internal static string Int32ToString(int i, string? format = null) { return i.ToString(format, CultureInfo.InvariantCulture); }

        internal static Vector2 StringToVector2(string s, char delim = ',')
        {
            if (String.IsNullOrEmpty(s)) throw new FormatException();
            string[] sp = s.Split(delim).Select((v) => v.Trim()).ToArray();
            if (sp.Length != 2) throw new FormatException();
            return new(StringToSingle(sp[0]), StringToSingle(sp[1]));
        }

        internal static Vector3 StringToVector3(string s, char delim = ',')
        {
            if (String.IsNullOrEmpty(s)) throw new FormatException();
            string[] sp = s.Split(delim).Select((v) => v.Trim()).ToArray();
            if (sp.Length != 3) throw new FormatException();
            return new(StringToSingle(sp[0]), StringToSingle(sp[1]), StringToSingle(sp[2]));
        }

        internal static Vector4 StringToVector4(string s, char delim = ',')
        {
            if (String.IsNullOrEmpty(s)) throw new FormatException();
            string[] sp = s.Split(delim).Select((v) => v.Trim()).ToArray();
            if (sp.Length != 4) throw new FormatException();
            return new(StringToSingle(sp[0]), StringToSingle(sp[1]), StringToSingle(sp[2]), StringToSingle(sp[3]));
        }

        internal static string Vector2ToString(Vector2 v)
        {
            return string.Format(CultureInfo.InvariantCulture, "{0},{1}", v.X, v.Y);
        }

        internal static string Vector3ToString(Vector3 v)
        {
            return string.Format(CultureInfo.InvariantCulture, "{0},{1},{2}", v.X, v.Y, v.Z);
        }

        internal static string Vector4ToString(Vector4 v)
        {
            return string.Format(CultureInfo.InvariantCulture, "{0},{1},{2},{3}", v.X, v.Y, v.Z, v.W);
        }
    }
}