using Luban.Job.Cfg.Datas;
using Luban.Job.Cfg.Defs;
using Luban.Job.Cfg.Utils;
using System.Collections.Generic;
using System.Text;

namespace Luban.Job.Cfg.DataVisitors
{
    class ToErlangLiteralVisitor : ToLiteralVisitorBase
    {
        public static ToErlangLiteralVisitor Ins { get; } = new();

        public override string Accept(DText type)
        {
            return $"#{{{DText.KEY_NAME}=>\"{type.Key}\",{DText.TEXT_NAME}=>\"{DataUtil.EscapeString(type.TextOfCurrentAssembly)}\"}}";
        }

        public override string Accept(DBean type)
        {
            var x = new StringBuilder();
            if (type.Type.IsAbstractType)
            {
                x.Append($"#{{name__ => \"{DataUtil.GetImplTypeName(type)}\"");
                if (type.Fields.Count > 0)
                {
                    x.Append(',');
                }
            }
            else
            {
                x.Append("#{");
            }

            int index = 0;
            foreach (var f in type.Fields)
            {
                var defField = type.ImplType.HierarchyFields[index++];
                if (f == null)
                {
                    continue;
                }
                if (index > 1)
                {
                    x.Append(',');
                }
                x.Append($"{defField.Name} => {f.Apply(this)}");
            }
            x.Append('}');
            return x.ToString();
        }


        protected void Append(List<DType> datas, StringBuilder x)
        {
            x.Append('[');
            int index = 0;
            foreach (var e in datas)
            {
                if (index++ > 0)
                {
                    x.Append(',');
                }
                x.Append(e.Apply(this));
            }
            x.Append(']');
        }

        public override string Accept(DArray type)
        {
            var x = new StringBuilder();
            Append(type.Datas, x);
            return x.ToString();
        }

        public override string Accept(DList type)
        {
            var x = new StringBuilder();
            Append(type.Datas, x);
            return x.ToString();
        }

        public override string Accept(DSet type)
        {
            var x = new StringBuilder();
            Append(type.Datas, x);
            return x.ToString();
        }

        public override string Accept(DMap type)
        {
            var x = new StringBuilder();
            x.Append("#{");
            int index = 0;
            foreach (var e in type.Datas)
            {
                if (index++ > 0)
                {
                    x.Append(',');
                }
                x.Append($"{e.Key.Apply(this)} => {e.Value.Apply(this)}");
            }
            x.Append('}');
            return x.ToString();
        }

        public override string Accept(DVector2 type)
        {
            var v = type.Value;
            return $"#{{x=>{v.X},y=>{v.Y}}}";
        }

        public override string Accept(DVector3 type)
        {
            var v = type.Value;
            return $"#{{x=>{v.X},y=>{v.Y},z=>{v.Z}}}";
        }

        public override string Accept(DVector4 type)
        {
            var v = type.Value;
            return $"#{{x=>{v.X},y=>{v.Y},z=>{v.Z},w=>{v.W}}}";
        }
    }
}