using System;
using System.Collections.Generic;
using System.Diagnostics;
using System.Drawing;
using System.IO;
using System.Linq;
using System.Reflection;
using Klocman.Extensions;
using Klocman.Native;
using Klocman.Tools;

namespace UninstallTools
{
    public static class UninstallToolsGlobalConfig
    {
        static UninstallToolsGlobalConfig()
        {
            AssemblyLocation = Assembly.GetExecutingAssembly().Location;
            if (AssemblyLocation.ContainsAny(new[] { ".dll", ".exe" }, StringComparison.OrdinalIgnoreCase))
                AssemblyLocation = PathTools.GetDirectory(AssemblyLocation);

            QuestionableDirectoryNames = new[]
            {
                "install", "settings", "config", "configuration", "users", "data"
            }.AsEnumerable();

            DirectoryBlacklist = new[]
            {
                "Microsoft", "Microsoft Games", "Temp", "Programs", "Common", "Common Files", "Clients",
                "Desktop", "Internet Explorer", "Windows NT", "Windows Photo Viewer", "Windows Mail",
                "Windows Defender", "Windows Media Player", "Uninstall Information", "Reference Assemblies",
                "InstallShield Installation Information"
            }.AsEnumerable();

            StockProgramFiles = new[]
            {
                WindowsTools.GetEnvironmentPath(CSIDL.CSIDL_PROGRAM_FILES),
                WindowsTools.GetProgramFilesX86Path()
            }.Distinct().ToList().AsEnumerable();

            // JunkSearchDirs --------------
            var localData = WindowsTools.GetEnvironmentPath(CSIDL.CSIDL_LOCAL_APPDATA);
            var paths = new List<string>
            {
                WindowsTools.GetEnvironmentPath(CSIDL.CSIDL_PROGRAMS),
                WindowsTools.GetEnvironmentPath(CSIDL.CSIDL_COMMON_PROGRAMS),
                WindowsTools.GetEnvironmentPath(CSIDL.CSIDL_APPDATA),
                WindowsTools.GetEnvironmentPath(CSIDL.CSIDL_COMMON_APPDATA),
                localData
                //Environment.GetFolderPath(Environment.SpecialFolder.MyDocuments) danger?
            };

            var appDataParentDir = Path.GetDirectoryName(localData.TrimEnd('\\', '/', ' '));
            if (!string.IsNullOrEmpty(appDataParentDir))
            {
                var lowDir = Path.Combine(appDataParentDir, "LocalLow");
                if(Directory.Exists(lowDir))
                    paths.Add(lowDir);
            }

            var vsPath = Path.Combine(localData, "VirtualStore");
            if (Directory.Exists(vsPath))
                paths.AddRange(Directory.GetDirectories(vsPath));

            JunkSearchDirs = paths.Distinct().ToList().AsEnumerable();
        }

        /// <summary>
        ///     Path to directory this assembly sits in.
        /// </summary>
        internal static string AssemblyLocation { get; }

        public static bool AutoDetectCustomProgramFiles { get; set; }

        /// <summary>
        ///     Custom "Program Files" directories. Use with dirs that get used to install applications to.
        /// </summary>
        public static string[] CustomProgramFiles { get; set; }

        /// <summary>
        ///     Directory names that should be ignored for safety.
        /// </summary>
        internal static IEnumerable<string> DirectoryBlacklist { get; }

        /// <summary>
        ///     Directories that can contain program junk.
        /// </summary>
        internal static IEnumerable<string> JunkSearchDirs { get; }

        /// <summary>
        ///     Directory names that probably aren't top-level or contain applications.
        /// </summary>
        internal static IEnumerable<string> QuestionableDirectoryNames { get; }

        /// <summary>
        ///     Automatize non-quiet uninstallers.
        /// </summary>
        public static bool QuietAutomatization { get; set; }

        /// <summary>
        ///     Kill stuck automatized uninstallers.
        /// </summary>
        public static bool QuietAutomatizationKillStuck { get; set; }

        public static bool ScanSteam { get; set; }

        public static bool ScanStoreApps { get; set; }

        public static bool ScanWinFeatures { get; set; }

        public static bool ScanWinUpdates { get; set; }

        /// <summary>
        ///     Built-in program files paths.
        /// </summary>
        internal static IEnumerable<string> StockProgramFiles { get; }

        public static bool ScanRegistry { get; set; }
        public static bool ScanDrives { get; set; }
        public static bool ScanPreDefined { get; set; }

        /// <summary>
        ///     Directiories containing programs, both built in "Program Files" and user-defined ones. Fast.
        /// </summary>
        internal static IEnumerable<string> GetAllProgramFiles()
        {
            if (CustomProgramFiles == null || CustomProgramFiles.Length == 0)
                return StockProgramFiles;

            // Create copy of custom dirs in case they change
            return StockProgramFiles.Concat(CustomProgramFiles).ToList();
        }

        /// <summary>
        ///     Get a list of directiories containing programs. Optionally user-defined directories are added.
        ///     The boolean value is true if the directory is confirmed to contain 64bit applications.
        /// </summary>
        /// <param name="includeUserDirectories">Add user-defined directories.</param>
        internal static IEnumerable<KeyValuePair<DirectoryInfo, bool?>> GetProgramFilesDirectories(
            bool includeUserDirectories)
        {
            var pfDirectories = new List<KeyValuePair<string, bool?>>(2);

            var pf64 = WindowsTools.GetEnvironmentPath(CSIDL.CSIDL_PROGRAM_FILES);
            var pf32 = WindowsTools.GetProgramFilesX86Path();
            pfDirectories.Add(new KeyValuePair<string, bool?>(pf32, false));
            if (!PathTools.PathsEqual(pf32, pf64))
                pfDirectories.Add(new KeyValuePair<string, bool?>(pf64, true));

            if (includeUserDirectories)
                pfDirectories.AddRange(CustomProgramFiles.Where(
                    x => !pfDirectories.Any(y => PathTools.PathsEqual(x, y.Key)))
                    .Select(x => new KeyValuePair<string, bool?>(x, null)));

            var output = new List<KeyValuePair<DirectoryInfo, bool?>>();
            foreach (var directory in pfDirectories.ToList())
            {
                // Ignore missing or inaccessible directories
                try
                {
                    var di = new DirectoryInfo(directory.Key);
                    if (di.Exists)
                        output.Add(new KeyValuePair<DirectoryInfo, bool?>(di, directory.Value));
                }
                catch (Exception ex)
                {
                    Debug.Fail("Failed to open dir", ex.Message);
                }
            }

            return output;
        }

        /// <summary>
        ///     Check if dir is a system directory and should be left alone.
        /// </summary>
        public static bool IsSystemDirectory(DirectoryInfo dir)
        {
            return //dir.Name.StartsWith("Windows ") //Probably overkill
                DirectoryBlacklist.Any(y => y.Equals(dir.Name, StringComparison.InvariantCultureIgnoreCase))
                || (dir.Attributes & FileAttributes.System) == FileAttributes.System;
        }

        /// <summary>
        ///     Safely try to extract icon from specified file. Return null if failed.
        /// </summary>
        internal static Icon TryExtractAssociatedIcon(string path)
        {
            if (path != null && File.Exists(path))
            {
                try
                {
                    return DrawingTools.ExtractAssociatedIcon(path);
                }
                catch (Exception ex)
                {
                    Debug.Fail(ex.Message);
                }
            }
            return null;
        }
    }
}