//
// PackageCompatibility.cs
//
// Author:
//       Matt Ward <matt.ward@xamarin.com>
//
// Copyright (c) 2014 Xamarin Inc. (http://xamarin.com)
//
// 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.

using System;
using System.Collections.Generic;
using System.Linq;
using System.Runtime.Versioning;
using ICSharpCode.PackageManagement;
using NuGet;

namespace MonoDevelop.PackageManagement
{
	public class PackageCompatibility
	{
		IDotNetProject project;
		IPackage package;
		FrameworkName packageTargetFramework;
		List<IPackageFile> packageFiles;
		IEnumerable<IPackageFile> oldProjectFrameworkCompatibleItems;
		IEnumerable<IPackageFile> newProjectFrameworkCompatibleItems;

		public PackageCompatibility (IDotNetProject project, IPackage package, FrameworkName packageTargetFramework)
		{
			this.project = project;
			this.package = package;
			this.packageTargetFramework = packageTargetFramework;
		}

		public void CheckCompatibility ()
		{
			GetPackageFiles ();
			CheckCompatibilityWithOriginalProjectTargetFramework ();
			CheckCompatibilityWithNewProjectTargetFramework ();

			ShouldReinstallPackage = !IsCompatibleWithOriginalAndNewProjectTargetFramework;

			if (!ShouldReinstallPackage) {
				ShouldReinstallPackage = !PackageItemsUnchangedForNewProjectTargetFramework ();
			}
		}

		public IPackage Package {
			get { return package; }
		}

		public bool ShouldReinstallPackage { get; private set; }
		public bool IsCompatibleWithNewProjectTargetFramework { get; private set; }
		public bool IsCompatibleWithOriginalProjectTargetFramework { get; private set; }

		public bool IsCompatibleWithOriginalAndNewProjectTargetFramework {
			get {
				return IsCompatibleWithOriginalProjectTargetFramework &&
					IsCompatibleWithNewProjectTargetFramework;
			}
		}

		void GetPackageFiles ()
		{
			packageFiles = package.GetFiles ().ToList ();
		}

		void CheckCompatibilityWithOriginalProjectTargetFramework ()
		{
			IsCompatibleWithOriginalProjectTargetFramework =
				VersionUtility.TryGetCompatibleItems (
					packageTargetFramework,
					packageFiles,
					out oldProjectFrameworkCompatibleItems);
		}

		void CheckCompatibilityWithNewProjectTargetFramework ()
		{
			var projectTargetFramework = new ProjectTargetFramework (project);

			IsCompatibleWithNewProjectTargetFramework =
				VersionUtility.TryGetCompatibleItems (
					projectTargetFramework.TargetFrameworkName,
					packageFiles,
					out newProjectFrameworkCompatibleItems);
		}

		bool PackageItemsUnchangedForNewProjectTargetFramework ()
		{
			return Enumerable.SequenceEqual<IPackageFile> (
				oldProjectFrameworkCompatibleItems,
				newProjectFrameworkCompatibleItems);
		}

		public string GenerateReport ()
		{
			return null;
		}
	}
}

