// Copyright (c) Ben A Adams. All rights reserved.
// Licensed under the Apache License, Version 2.0. See License.txt in the project root for license information.

using DTLib.Demystifier.Internal;

namespace DTLib.Demystifier;

public class ValueTupleResolvedParameter : ResolvedParameter
{
    public ValueTupleResolvedParameter(Type resolvedType, IList<string> tupleNames)
        : base(resolvedType)
    {
        TupleNames = tupleNames;
    }

    public IList<string> TupleNames { get; }

    protected override void AppendTypeName(StringBuilder sb)
    {
        if (ResolvedType is not null)
        {
            if (ResolvedType.IsValueTuple())
            {
                AppendValueTupleParameterName(sb, ResolvedType);
            }
            else
            {
                // Need to unwrap the first generic argument first.
                sb.Append(TypeNameHelper.GetTypeNameForGenericType(ResolvedType));
                sb.Append("<");
                AppendValueTupleParameterName(sb, ResolvedType.GetGenericArguments()[0]);
                sb.Append(">");
            }
        }
    }

    private void AppendValueTupleParameterName(StringBuilder sb, Type parameterType)
    {
        sb.Append('(');
        var args = parameterType.GetGenericArguments();
        for (var i = 0; i < args.Length; i++)
        {
            if (i > 0) sb.Append(", ");

            sb.AppendTypeDisplayName(args[i], false, true);

            if (i >= TupleNames.Count) continue;

            var argName = TupleNames[i];
            if (argName is null) continue;

            sb.Append(' ');
            sb.Append(argName);
        }

        sb.Append(')');
    }
}