/*************************************************************************
 * ModernUO                                                              *
 * Copyright 2019-2024 - ModernUO Development Team                       *
 * Email: hi@modernuo.com                                                *
 * File: IGenericWriter.cs                                               *
 *                                                                       *
 * This program is free software: you can redistribute it and/or modify  *
 * it under the terms of the GNU General Public License as published by  *
 * the Free Software Foundation, either version 3 of the License, or     *
 * (at your option) any later version.                                   *
 *                                                                       *
 * You should have received a copy of the GNU General Public License     *
 * along with this program.  If not, see <http://www.gnu.org/licenses/>. *
 *************************************************************************/

using System;
using System.Buffers;
using System.Collections;
using System.IO;
using System.Net;

namespace Server;

public interface IGenericWriter
{
    long Position { get; }
    void Write(string value);
    void Write(long value);
    void Write(ulong value);
    void Write(int value);
    void Write(uint value);
    void Write(short value);
    void Write(ushort value);
    void Write(double value);
    void Write(float value);
    void Write(byte value);
    void Write(sbyte value);
    void Write(bool value);
    void Write(Serial serial);
    void Write(Type type);
    void Write(decimal value);

    void Write(DateTime value)
    {
        // If DateTimeKind is Unspecified, we can't assume it needs to be converted.
        if (value.Kind == DateTimeKind.Local)
        {
            value = value.ToUniversalTime();
        }

        Write(value.Ticks);
    }
    void WriteDeltaTime(DateTime value)
    {
        if (value == DateTime.MinValue)
        {
            Write(long.MinValue);
            return;
        }

        if (value == DateTime.MaxValue)
        {
            Write(long.MaxValue);
            return;
        }

        if (value.Kind == DateTimeKind.Local)
        {
            value = value.ToUniversalTime();
        }

        // Technically supports negative deltas for times in the past
        Write(value.Ticks - DateTime.UtcNow.Ticks);
    }
    void Write(IPAddress value)
    {
        Span<byte> stack = stackalloc byte[16];
        value.TryWriteBytes(stack, out var bytesWritten);
        Write((byte)bytesWritten);
        Write(stack[..bytesWritten]);
    }

    void Write(TimeSpan value)
    {
        Write(value.Ticks);
    }

    void WriteEncodedInt(int value)
    {
        var v = (uint)value;

        while (v >= 0x80)
        {
            Write((byte)(v | 0x80));
            v >>= 7;
        }

        Write((byte)v);
    }

    void Write(Point3D value)
    {
        Write(value.m_X);
        Write(value.m_Y);
        Write(value.m_Z);
    }
    void Write(Point2D value)
    {
        Write(value.m_X);
        Write(value.m_Y);
    }
    void Write(Rectangle2D value)
    {
        Write(value.Start);
        Write(value.End);
    }
    void Write(Rectangle3D value)
    {
        Write(value.Start);
        Write(value.End);
    }
    void Write(Map value) => Write((byte)(value?.MapIndex ?? 0xFF));
    void Write(Race value) => Write((byte)(value?.RaceIndex ?? 0xFF));
    void Write(byte[] bytes);
    void Write(byte[] bytes, int offset, int count);
    void Write(ReadOnlySpan<byte> bytes);
    unsafe void WriteEnum<T>(T value) where T : unmanaged, Enum
    {
        switch (sizeof(T))
        {
            default:
                {
                    throw new ArgumentException($"Argument of type {typeof(T)} is not a normal enum");
                }
            case 1:
                {
                    Write(*(byte*)&value);
                    break;
                }
            case 2:
                {
                    Write(*(ushort*)&value);
                    break;
                }
            case 4:
                {
                    WriteEncodedInt(*(int*)&value);
                    break;
                }
            case 8:
                {
                    Write(*(ulong*)&value);
                    break;
                }
        }
    }
    void Write(Guid guid)
    {
        Span<byte> stack = stackalloc byte[16];
        guid.TryWriteBytes(stack);
        Write(stack);
    }

    public void Write(BitArray bitArray)
    {
        var bytesLength = (bitArray.Length - 1 + (1 << 3)) >>> 3;
        var arrayBuffer = ArrayPool<byte>.Shared.Rent(bytesLength);

        WriteEncodedInt(bytesLength);
        bitArray.CopyTo(arrayBuffer, 0);

        Write(arrayBuffer.AsSpan(0, bytesLength));
        ArrayPool<byte>.Shared.Return(arrayBuffer);
    }

    void Write(TextDefinition def)
    {
        if (def == null)
        {
            WriteEncodedInt(3);
        }
        else if (def.Number > 0)
        {
            WriteEncodedInt(1);
            WriteEncodedInt(def.Number);
        }
        else if (def.String != null)
        {
            WriteEncodedInt(2);
            Write(def.String);
        }
        else
        {
            WriteEncodedInt(0); // Empty
        }
    }

    long Seek(long offset, SeekOrigin origin);
}