// 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;
using System.Collections.Generic;
using System.IO;

namespace Microsoft.Extensions.Configuration.UserSecrets.Tests
{
    public class UserSecretsTestFixture : IDisposable
    {
        private Stack<Action> _disposables = new Stack<Action>();

        public const string TestSecretsId = "b918174fa80346bbb7f4a386729c0eff";

        public UserSecretsTestFixture()
        {
            _disposables.Push(() => TryDelete(Path.GetDirectoryName(PathHelper.GetSecretsPathFromSecretsId(TestSecretsId))));
        }

        public void Dispose()
        {
            while (_disposables.Count > 0)
            {
                _disposables.Pop()?.Invoke();
            }
        }

        public string GetTempSecretProject()
        {
            string userSecretsId;
            return GetTempSecretProject(out userSecretsId);
        }

        private const string ProjectTemplate = @"<Project ToolsVersion=""15.0"" Sdk=""Microsoft.NET.Sdk"">
  <PropertyGroup>
    <OutputType>Exe</OutputType>
    <TargetFrameworks>netcoreapp2.1</TargetFrameworks>
    {0}
    <EnableDefaultCompileItems>false</EnableDefaultCompileItems>
  </PropertyGroup>

  <ItemGroup>
    <Compile Include=""**\*.cs"" Exclude=""Excluded.cs;$(DefaultItemExcludes)"" />
  </ItemGroup>
</Project>";

        public string GetTempSecretProject(out string userSecretsId)
        {
            userSecretsId = Guid.NewGuid().ToString();
            return CreateProject(userSecretsId);
        }

        public string CreateProject(string userSecretsId)
        {
            var projectPath = Directory.CreateDirectory(Path.Combine(Path.GetTempPath(), "usersecretstest", Guid.NewGuid().ToString()));
            var prop = string.IsNullOrEmpty(userSecretsId)
                ? string.Empty
                : $"<UserSecretsId>{userSecretsId}</UserSecretsId>";

            File.WriteAllText(
                Path.Combine(projectPath.FullName, "TestProject.csproj"),
                string.Format(ProjectTemplate, prop));

            var id = userSecretsId;
            _disposables.Push(() =>
            {
                try
                {
                    // may throw if id is bad
                    var secretsDir = Path.GetDirectoryName(PathHelper.GetSecretsPathFromSecretsId(id));
                    TryDelete(secretsDir);
                }
                catch { }
            });
            _disposables.Push(() => TryDelete(projectPath.FullName));

            return projectPath.FullName;
        }

        private static void TryDelete(string directory)
        {
            try
            {
                if (Directory.Exists(directory))
                {
                    Directory.Delete(directory, true);
                }
            }
            catch (Exception)
            {
                // Ignore failures.
                Console.WriteLine("Failed to delete " + directory);
            }
        }
    }
}