/* ========================================================================
 * Copyright (c) 2005-2025 The OPC Foundation, Inc. All rights reserved.
 *
 * OPC Foundation MIT License 1.00
 *
 * Permission is hereby granted, free of charge, to any person
 * obtaining a copy of this software and associated documentation
 * files (the "Software"), to deal in the Software without
 * restriction, including without limitation the rights to use,
 * copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the
 * Software is furnished to do so, subject to the following
 * conditions:
 *
 * The above copyright notice and this permission notice shall be
 * included in all copies or substantial portions of the Software.
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
 * OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
 * HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
 * WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
 * OTHER DEALINGS IN THE SOFTWARE.
 *
 * The complete license agreement can be found here:
 * http://opcfoundation.org/License/MIT/1.00/
 * ======================================================================*/

using System;
using Opc.Ua.Schema.Model;

namespace Opc.Ua.SourceGeneration
{
    /// <summary>
    /// Resolves the effective method argument metadata used by generators.
    /// </summary>
    internal static class MethodDesignArgumentResolver
    {
        /// <summary>
        /// Resolves the effective input arguments for a method design.
        /// </summary>
        public static Parameter[] ResolveMethodInputs(MethodDesign method)
        {
            if (method == null)
            {
                throw new ArgumentNullException(nameof(method));
            }

            return ResolveArguments(
                method.InputArguments,
                method.MethodDeclarationNode?.InputArguments,
                method.MethodType?.InputArguments);
        }

        /// <summary>
        /// Resolves the effective output arguments for a method design.
        /// </summary>
        public static Parameter[] ResolveMethodOutputs(MethodDesign method)
        {
            if (method == null)
            {
                throw new ArgumentNullException(nameof(method));
            }

            return ResolveArguments(
                method.OutputArguments,
                method.MethodDeclarationNode?.OutputArguments,
                method.MethodType?.OutputArguments);
        }

        private static Parameter[] ResolveArguments(
            Parameter[] methodArguments,
            Parameter[] declarationArguments,
            Parameter[] methodTypeArguments)
        {
            if (methodArguments is { Length: > 0 })
            {
                return methodArguments;
            }

            if (declarationArguments is { Length: > 0 })
            {
                return declarationArguments;
            }

            if (methodTypeArguments is { Length: > 0 })
            {
                return methodTypeArguments;
            }

            return [];
        }
    }
}