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

using System;

namespace NuGet.Protocol.Plugins
{
    /// <summary>
    /// Represents a plugin file.
    /// </summary>
    public sealed class PluginFile
    {
        /// <summary>
        /// Gets the plugin's file path.
        /// </summary>
        public string Path { get; }

        /// <summary>
        /// Gets the plugin file state.
        /// </summary>
        public Lazy<PluginFileState> State { get; }

        /// <summary>
        /// Indicates if the plugin file requires a dotnet host.
        /// </summary>
        internal bool RequiresDotnetHost { get; }

        /// <summary>
        /// Instantiates a new <see cref="PluginFile" /> class.
        /// </summary>
        /// <param name="filePath">The plugin's file path.</param>
        /// <param name="state">A lazy that evaluates the plugin file state.</param>
        /// <param name="requiresDotnetHost">Indicates if the plugin file requires a dotnet host.</param>
        public PluginFile(string filePath, Lazy<PluginFileState> state, bool requiresDotnetHost)
        {
            if (string.IsNullOrEmpty(filePath))
            {
                throw new ArgumentException(Strings.ArgumentCannotBeNullOrEmpty, nameof(filePath));
            }

            RequiresDotnetHost = requiresDotnetHost;
            Path = filePath;
            State = state;
        }

#if IS_DESKTOP
        /// <summary>
        /// Instantiates a new <see cref="PluginFile" /> class.
        /// The plug-in will be executed directly.
        /// If it needs to run under the dotnet host, use <see cref="PluginFile(string, Lazy{PluginFileState}, bool)" /> and specify <see langword="true" /> for the <c>requiresDotnetHost</c> parameter.
        /// </summary>
        /// <param name="filePath">The plugin's file path.</param>
        /// <param name="state">A lazy that evaluates the plugin file state.</param>
#else
        /// <summary>
        /// Instantiates a new <see cref="PluginFile" /> class.
        /// The plug-in will be executed under the dotnet host.
        /// If it needs to be executed directly, use <see cref="PluginFile(string, Lazy{PluginFileState}, bool)" /> and specify <see langword="false" /> for the <c>requiresDotnetHost</c> parameter.
        /// </summary>
        /// <param name="filePath">The plugin's file path.</param>
        /// <param name="state">A lazy that evaluates the plugin file state.</param>
#endif
        public PluginFile(string filePath, Lazy<PluginFileState> state)
#if IS_DESKTOP
            : this(filePath, state, requiresDotnetHost: false)
#else
            : this(filePath, state, requiresDotnetHost: true)
#endif
        {
        }

        public override string ToString()
        {
            return $"{Path} : {State}";
        }
    }
}