namespace Nbt.Serialization;

using System.Globalization;
using Nbt.Tag;

public static class SNbt
{
    #region Serialize

    public enum SerializationStyle
    {
        Compact, Spaced, Indented
    }

    public class SerializerOptions
    {
        public static readonly SerializerOptions Default = new();

        public SerializationStyle Style { get; init; } = SerializationStyle.Compact;
        public string Indent { get; init; } = "  ";
        public bool AlwaysQuoteTagNames { get; init; } = false;
        // public bool AlwaysQuoteStringTags { get; init; } = false;
    }

    public static string Serialize(INbtTag tag, SerializerOptions? options = null) => Serialize(options, serializer => serializer.Serialize(tag));
    public static string Serialize(NamedTag tag, SerializerOptions? options = null) => Serialize(options, serializer => serializer.Serialize(tag));
    public static string Serialize(INbtList tag, SerializerOptions? options = null) => Serialize(options, serializer => serializer.Serialize(tag));
    public static string Serialize(INbtCompound tag, SerializerOptions? options = null) => Serialize(options, serializer => serializer.Serialize(tag));
    public static string Serialize(INbtArray tag, SerializerOptions? options = null) => Serialize(options, serializer => serializer.Serialize(tag));
    public static string Serialize(INbtValue tag, SerializerOptions? options = null) => Serialize(options, serializer => serializer.Serialize(tag));
    public static string Serialize(INbtArray<sbyte> tag, SerializerOptions? options = null) => Serialize(options, serializer => serializer.Serialize(tag));
    public static string Serialize(INbtArray<int> tag, SerializerOptions? options = null) => Serialize(options, serializer => serializer.Serialize(tag));
    public static string Serialize(INbtArray<long> tag, SerializerOptions? options = null) => Serialize(options, serializer => serializer.Serialize(tag));
    public static string Serialize(INbtValue<sbyte> tag, SerializerOptions? options = null) => Serialize(options, serializer => serializer.Serialize(tag));
    public static string Serialize(INbtValue<short> tag, SerializerOptions? options = null) => Serialize(options, serializer => serializer.Serialize(tag));
    public static string Serialize(INbtValue<int> tag, SerializerOptions? options = null) => Serialize(options, serializer => serializer.Serialize(tag));
    public static string Serialize(INbtValue<long> tag, SerializerOptions? options = null) => Serialize(options, serializer => serializer.Serialize(tag));
    public static string Serialize(INbtValue<float> tag, SerializerOptions? options = null) => Serialize(options, serializer => serializer.Serialize(tag));
    public static string Serialize(INbtValue<double> tag, SerializerOptions? options = null) => Serialize(options, serializer => serializer.Serialize(tag));
    public static string Serialize(INbtValue<string> tag, SerializerOptions? options = null) => Serialize(options, serializer => serializer.Serialize(tag));

    public static void Serialize(TextWriter writer, INbtTag tag, SerializerOptions? options = null) => Serialize(writer, options, serializer => serializer.Serialize(tag));
    public static void Serialize(TextWriter writer, NamedTag tag, SerializerOptions? options = null) => Serialize(writer, options, serializer => serializer.Serialize(tag));
    public static void Serialize(TextWriter writer, INbtList tag, SerializerOptions? options = null) => Serialize(writer, options, serializer => serializer.Serialize(tag));
    public static void Serialize(TextWriter writer, INbtCompound tag, SerializerOptions? options = null) => Serialize(writer, options, serializer => serializer.Serialize(tag));
    public static void Serialize(TextWriter writer, INbtArray tag, SerializerOptions? options = null) => Serialize(writer, options, serializer => serializer.Serialize(tag));
    public static void Serialize(TextWriter writer, INbtValue tag, SerializerOptions? options = null) => Serialize(writer, options, serializer => serializer.Serialize(tag));
    public static void Serialize(TextWriter writer, INbtArray<sbyte> tag, SerializerOptions? options = null) => Serialize(writer, options, serializer => serializer.Serialize(tag));
    public static void Serialize(TextWriter writer, INbtArray<int> tag, SerializerOptions? options = null) => Serialize(writer, options, serializer => serializer.Serialize(tag));
    public static void Serialize(TextWriter writer, INbtArray<long> tag, SerializerOptions? options = null) => Serialize(writer, options, serializer => serializer.Serialize(tag));
    public static void Serialize(TextWriter writer, INbtValue<sbyte> tag, SerializerOptions? options = null) => Serialize(writer, options, serializer => serializer.Serialize(tag));
    public static void Serialize(TextWriter writer, INbtValue<short> tag, SerializerOptions? options = null) => Serialize(writer, options, serializer => serializer.Serialize(tag));
    public static void Serialize(TextWriter writer, INbtValue<int> tag, SerializerOptions? options = null) => Serialize(writer, options, serializer => serializer.Serialize(tag));
    public static void Serialize(TextWriter writer, INbtValue<long> tag, SerializerOptions? options = null) => Serialize(writer, options, serializer => serializer.Serialize(tag));
    public static void Serialize(TextWriter writer, INbtValue<float> tag, SerializerOptions? options = null) => Serialize(writer, options, serializer => serializer.Serialize(tag));
    public static void Serialize(TextWriter writer, INbtValue<double> tag, SerializerOptions? options = null) => Serialize(writer, options, serializer => serializer.Serialize(tag));
    public static void Serialize(TextWriter writer, INbtValue<string> tag, SerializerOptions? options = null) => Serialize(writer, options, serializer => serializer.Serialize(tag));

    public static void Serialize(Stream stream, INbtTag tag, SerializerOptions? options = null) => Serialize(stream, options, serializer => serializer.Serialize(tag));
    public static void Serialize(Stream stream, NamedTag tag, SerializerOptions? options = null) => Serialize(stream, options, serializer => serializer.Serialize(tag));
    public static void Serialize(Stream stream, INbtList tag, SerializerOptions? options = null) => Serialize(stream, options, serializer => serializer.Serialize(tag));
    public static void Serialize(Stream stream, INbtCompound tag, SerializerOptions? options = null) => Serialize(stream, options, serializer => serializer.Serialize(tag));
    public static void Serialize(Stream stream, INbtArray tag, SerializerOptions? options = null) => Serialize(stream, options, serializer => serializer.Serialize(tag));
    public static void Serialize(Stream stream, INbtValue tag, SerializerOptions? options = null) => Serialize(stream, options, serializer => serializer.Serialize(tag));
    public static void Serialize(Stream stream, INbtArray<sbyte> tag, SerializerOptions? options = null) => Serialize(stream, options, serializer => serializer.Serialize(tag));
    public static void Serialize(Stream stream, INbtArray<int> tag, SerializerOptions? options = null) => Serialize(stream, options, serializer => serializer.Serialize(tag));
    public static void Serialize(Stream stream, INbtArray<long> tag, SerializerOptions? options = null) => Serialize(stream, options, serializer => serializer.Serialize(tag));
    public static void Serialize(Stream stream, INbtValue<sbyte> tag, SerializerOptions? options = null) => Serialize(stream, options, serializer => serializer.Serialize(tag));
    public static void Serialize(Stream stream, INbtValue<short> tag, SerializerOptions? options = null) => Serialize(stream, options, serializer => serializer.Serialize(tag));
    public static void Serialize(Stream stream, INbtValue<int> tag, SerializerOptions? options = null) => Serialize(stream, options, serializer => serializer.Serialize(tag));
    public static void Serialize(Stream stream, INbtValue<long> tag, SerializerOptions? options = null) => Serialize(stream, options, serializer => serializer.Serialize(tag));
    public static void Serialize(Stream stream, INbtValue<float> tag, SerializerOptions? options = null) => Serialize(stream, options, serializer => serializer.Serialize(tag));
    public static void Serialize(Stream stream, INbtValue<double> tag, SerializerOptions? options = null) => Serialize(stream, options, serializer => serializer.Serialize(tag));
    public static void Serialize(Stream stream, INbtValue<string> tag, SerializerOptions? options = null) => Serialize(stream, options, serializer => serializer.Serialize(tag));

    private static void Serialize(TextWriter writer, SerializerOptions? options, Action<Serializer> serialize)
    {
        var serializer = new Serializer(writer, options);
        serialize(serializer);
    }

    private static void Serialize(Stream stream, SerializerOptions? options, Action<Serializer> serialize)
    {
        using var writer = new StreamWriter(stream, leaveOpen: true);
        Serialize(writer, options, serialize);
    }

    private static string Serialize(SerializerOptions? options, Action<Serializer> serialize)
    {
        using var writer = new StringWriter();
        Serialize(writer, options, serialize);
        return writer.ToString();
    }

    private sealed class Serializer(TextWriter writer, SerializerOptions? options)
    {
        private readonly TextWriter writer = writer;
        private readonly SerializerOptions options = options ?? SerializerOptions.Default;
        private uint depth = 0u;

        private void WriteIndent()
        {
            for (var i = 0u; i < depth; i++)
            {
                writer.Write(options.Indent);
            }
        }

        public void Serialize(INbtTag tag)
        {
            switch (tag)
            {
                case INbtArray arrayTag:
                    Serialize(arrayTag);
                    break;

                case INbtValue valueTag:
                    Serialize(valueTag);
                    break;

                case INbtList listTag:
                    Serialize(listTag);
                    break;

                case INbtCompound compoundTag:
                    Serialize(compoundTag);
                    break;
            }
        }

        public void Serialize(NamedTag namedTag)
        {
            if (!string.IsNullOrEmpty(namedTag.Name))
            {
                writer.Write(NbtUtils.QuoteString(namedTag.Name, onlyIfNeeded: !options.AlwaysQuoteTagNames));
                writer.Write(':');
                if (options.Style is not SerializationStyle.Compact)
                {
                    writer.Write(' ');
                }
            }

            Serialize(namedTag.Tag);
        }

        public void Serialize(INbtList tag)
        {
            writer.Write('[');

            depth++;

            var style = options.Style;
            var isSpaced = style is SerializationStyle.Spaced;
            var isIndented = style is SerializationStyle.Indented;

            var b = false;

            foreach (var entry in tag)
            {
                if (b)
                {
                    writer.Write(',');
                    if (isSpaced)
                    {
                        writer.Write(' ');
                    }
                }
                else
                {
                    b = true;
                }

                if (isIndented)
                {
                    writer.WriteLine();
                    WriteIndent();
                }

                Serialize(entry);
            }

            depth--;

            if (b && isIndented)
            {
                writer.WriteLine();
                WriteIndent();
            }

            writer.Write(']');
        }

        public void Serialize(INbtCompound tag)
        {
            writer.Write('{');

            depth++;

            var style = options.Style;
            var isSpaced = style is SerializationStyle.Spaced;
            var isIndented = style is SerializationStyle.Indented;

            var b = false;

            foreach (var entry in tag as IEnumerable<NamedTag>)
            {
                if (b)
                {
                    writer.Write(',');
                    if (isSpaced)
                    {
                        writer.Write(' ');
                    }
                }
                else
                {
                    b = true;
                }

                if (isIndented)
                {
                    writer.WriteLine();
                    WriteIndent();
                }

                Serialize(entry);
            }

            depth--;

            if (b && isIndented)
            {
                writer.WriteLine();
                WriteIndent();
            }

            writer.Write('}');
        }

        public void Serialize(INbtArray tag)
        {
            switch (tag)
            {
                case INbtArray<sbyte> byteArrayTag:
                    Serialize(byteArrayTag);
                    break;

                case INbtArray<int> intArrayTag:
                    Serialize(intArrayTag);
                    break;

                case INbtArray<long> longArrayTag:
                    Serialize(longArrayTag);
                    break;
            }
        }

        public void Serialize(INbtValue valueTag)
        {
            switch (valueTag)
            {
                case INbtValue<sbyte> tag:
                    Serialize(tag);
                    break;

                case INbtValue<short> tag:
                    Serialize(tag);
                    break;

                case INbtValue<int> tag:
                    Serialize(tag);
                    break;

                case INbtValue<long> tag:
                    Serialize(tag);
                    break;

                case INbtValue<float> tag:
                    Serialize(tag);
                    break;

                case INbtValue<double> tag:
                    Serialize(tag);
                    break;

                case INbtValue<string> tag:
                    Serialize(tag);
                    break;
            }
        }

        public void Serialize(INbtArray<sbyte> tag) => Serialize(tag, 'B', Serialize);

        public void Serialize(INbtArray<int> tag) => Serialize(tag, 'I', Serialize);

        public void Serialize(INbtArray<long> tag) => Serialize(tag, 'L', Serialize);

        public void Serialize(INbtValue<sbyte> tag) => Serialize(tag.Value);

        public void Serialize(INbtValue<short> tag) => Serialize(tag.Value);

        public void Serialize(INbtValue<int> tag) => Serialize(tag.Value);

        public void Serialize(INbtValue<long> tag) => Serialize(tag.Value);

        public void Serialize(INbtValue<float> tag) => Serialize(tag.Value);

        public void Serialize(INbtValue<double> tag) => Serialize(tag.Value);

        public void Serialize(INbtValue<string> tag) => Serialize(tag.Value);

        private void Serialize<T>(INbtArray<T> tag, char decorator, Action<T> writeValue) where T : notnull
        {
            writer.Write('[');
            writer.Write(decorator);
            writer.Write(';');

            if (tag.Value.Length > 0)
            {
                var isNotCompact = options.Style is not SerializationStyle.Compact;

                if (isNotCompact)
                {
                    writer.Write(' ');
                }

                var b = false;

                foreach (var e in tag)
                {
                    if (b)
                    {
                        writer.Write(',');
                        if (isNotCompact)
                        {
                            writer.Write(' ');
                        }
                    }
                    else
                    {
                        b = true;
                    }

                    writeValue(e);
                }
            }

            writer.Write(']');
        }

        private void Serialize(sbyte value)
        {
            writer.Write(value.ToString(CultureInfo.InvariantCulture));
            writer.Write('b');
        }

        private void Serialize(short value)
        {
            writer.Write(value.ToString(CultureInfo.InvariantCulture));
            writer.Write('s');
        }

        private void Serialize(int value)
        {
            writer.Write(value.ToString(CultureInfo.InvariantCulture));
        }

        private void Serialize(long value)
        {
            writer.Write(value.ToString(CultureInfo.InvariantCulture));
            writer.Write('L');
        }

        private void Serialize(float value)
        {
            writer.Write(value.ToString(CultureInfo.InvariantCulture));

            if (float.IsFinite(value))
            {
                writer.Write('F');
            }
        }

        private void Serialize(double value)
        {
            writer.Write(value.ToString(CultureInfo.InvariantCulture));

            if (double.IsFinite(value))
            {
                writer.Write('D');
            }
        }

        private void Serialize(string value)
        {
            // Utils.Quote(writer, value, NbtUtils.DOUBLE_QUOTE_CHAR, NbtUtils.ESCAPE_CHAR);
            writer.Write(NbtUtils.QuoteString(value, onlyIfNeeded: false));
        }
    }

    #endregion
}