using System;
using System.Collections.Generic;
using Microsoft.CodeAnalysis;
using System.IO;

namespace Semmle.Extraction.CIL.Entities
{
    /// <summary>
    /// An entity representing a field.
    /// </summary>
    internal abstract class Field : GenericContext, IMember
    {
        protected Field(Context cx) : base(cx)
        {
        }

        public Label Label { get; set; }

        public void WriteId(TextWriter trapFile)
        {
            trapFile.WriteSubId(DeclaringType);
            trapFile.Write('.');
            trapFile.Write(Name);
        }

        public void WriteQuotedId(TextWriter trapFile)
        {
            trapFile.Write("@\"");
            WriteId(trapFile);
            trapFile.Write(idSuffix);
            trapFile.Write('\"');
        }

        private const string idSuffix = ";cil-field";

        public abstract string Name { get; }

        public abstract Type DeclaringType { get; }

        public Location ReportingLocation => throw new NotImplementedException();

        public abstract Type Type { get; }

        public virtual IEnumerable<IExtractionProduct> Contents
        {
            get
            {
                yield return Tuples.cil_field(this, DeclaringType, Name, Type);
            }
        }

        public void Extract(Context cx2)
        {
            cx2.Populate(this);
        }

        TrapStackBehaviour IEntity.TrapStackBehaviour => TrapStackBehaviour.NoLabel;
    }
}