/*************************************************************************
 * ModernUO                                                              *
 * Copyright (C) 2019-2021 - ModernUO Development Team                   *
 * Email: hi@modernuo.com                                                *
 * File: SourceGeneration.Arguments.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.Collections.Generic;
using System.Collections.Immutable;
using System.Text;
using Microsoft.CodeAnalysis;

namespace SerializationGenerator
{
    public static partial class SourceGeneration
    {
        public static void GetTypesFromTypedConstant(TypedConstant arg, List<ITypeSymbol> list)
        {
            if (arg.Kind == TypedConstantKind.Type)
            {
                list.Add((ITypeSymbol)arg.Value);
            }
            else if (arg.Kind == TypedConstantKind.Array)
            {
                for (var i = 0; i < arg.Values.Length; i++)
                {
                    GetTypesFromTypedConstant(arg.Values[i], list);
                }
            }
        }

        public static void GenerateSignatureArguments(this StringBuilder source, ImmutableArray<(ITypeSymbol, string)> parameters)
        {
            for (var i = 0; i < parameters.Length; i++)
            {
                var (t, v) = parameters[i];
                source.AppendFormat("{0} {1}", t.ToDisplayString(), v);
                if (i < parameters.Length - 1)
                {
                    source.Append(", ");
                }
            }
        }

        public static void GenerateNamedArgument(this StringBuilder source, KeyValuePair<string, TypedConstant> namedArg)
        {
            source.AppendFormat("{0} = ", namedArg.Key);
            source.GenerateTypedConstant(namedArg.Value);
        }

        public static void GenerateTypedConstants(this StringBuilder source, ImmutableArray<TypedConstant> args)
        {
            source.Append("new []{");
            for (var i = 0; i < args.Length; i++)
            {
                source.GenerateTypedConstant(args[i]);
                if (i < args.Length - 1)
                {
                    source.Append(", ");
                }
            }
            source.Append('}');
        }

        public static void GenerateTypedConstant(this StringBuilder source, TypedConstant arg)
        {
            if (arg.IsNull)
            {
                source.Append("null");
                return;
            }

            switch (arg.Kind)
            {
                default:
                    {
                        return;
                    }
                case TypedConstantKind.Primitive:
                    {

                        if (arg.Value is string str)
                        {
                            source.AppendFormat("\"{0}\"", str);
                        }
                        else
                        {
                            source.Append(arg.Value);
                        }
                        break;
                    }
                case TypedConstantKind.Enum:
                    {
                        if (arg.Type == null || arg.Value == null)
                        {
                            source.Append("null");
                        }
                        else
                        {
                            source.AppendFormat("({0}){1}", arg.Type.ToDisplayString(), arg.Value);
                        }
                        break;
                    }
                case TypedConstantKind.Type:
                    {
                        source.AppendFormat("typeof({0})", ((ITypeSymbol)arg.Value)?.Name);
                        break;
                    }
                case TypedConstantKind.Array:
                    {
                        source.GenerateTypedConstants(arg.Values);
                        break;
                    }
            }
        }
    }
}
