using System;
using System.Diagnostics;
using System.IO;
using System.Linq;
#pragma warning disable IDE0005
using System.Windows;

#pragma warning restore IDE0005

namespace Flow.Launcher.Plugin.SharedCommands
{
    /// <summary>
    /// Commands that are useful to run on files... and folders!
    /// </summary>
    public static class FilesFolders
    {
        private const string FileExplorerProgramName = "explorer";

        /// <summary>
        /// Copies the folder and all of its files and folders 
        /// including subFolders to the target location
        /// </summary>
        /// <param name="sourcePath"></param>
        /// <param name="targetPath"></param>
        public static void CopyAll(this string sourcePath, string targetPath)
        {
            // Get the subdirectories for the specified directory.
            DirectoryInfo dir = new DirectoryInfo(sourcePath);

            if (!dir.Exists)
            {
                throw new DirectoryNotFoundException(
                    "Source directory does not exist or could not be found: "
                    + sourcePath);
            }

            try
            {
                DirectoryInfo[] dirs = dir.GetDirectories();
                // If the destination directory doesn't exist, create it.
                if (!Directory.Exists(targetPath))
                {
                    Directory.CreateDirectory(targetPath);
                }

                // Get the files in the directory and copy them to the new location.
                FileInfo[] files = dir.GetFiles();
                foreach (FileInfo file in files)
                {
                    string tempPath = Path.Combine(targetPath, file.Name);
                    file.CopyTo(tempPath, false);
                }

                // Recursively copy subdirectories by calling itself on each subdirectory until there are no more to copy
                foreach (DirectoryInfo subDir in dirs)
                {
                    string tempPath = Path.Combine(targetPath, subDir.Name);
                    CopyAll(subDir.FullName, tempPath);
                }
            }
            catch (Exception)
            {
#if DEBUG
                throw;
#else
                MessageBox.Show(string.Format("Copying path {0} has failed, it will now be deleted for consistency", targetPath));
                RemoveFolderIfExists(targetPath);
#endif
            }
        }

        /// <summary>
        /// Check if the files and directories are identical between <paramref name="fromPath"/> 
        /// and <paramref name="toPath"/>
        /// </summary>
        /// <param name="fromPath"></param>
        /// <param name="toPath"></param>
        /// <returns></returns>
        public static bool VerifyBothFolderFilesEqual(this string fromPath, string toPath)
        {
            try
            {
                var fromDir = new DirectoryInfo(fromPath);
                var toDir = new DirectoryInfo(toPath);

                if (fromDir.GetFiles("*", SearchOption.AllDirectories).Length !=
                    toDir.GetFiles("*", SearchOption.AllDirectories).Length)
                    return false;

                if (fromDir.GetDirectories("*", SearchOption.AllDirectories).Length !=
                    toDir.GetDirectories("*", SearchOption.AllDirectories).Length)
                    return false;

                return true;
            }
            catch (Exception)
            {
#if DEBUG
                throw;
#else
                MessageBox.Show(string.Format("Unable to verify folders and files between {0} and {1}", fromPath, toPath));
                return false;
#endif
            }
        }

        /// <summary>
        /// Deletes a folder if it exists
        /// </summary>
        /// <param name="path"></param>
        public static void RemoveFolderIfExists(this string path)
        {
            try
            {
                if (Directory.Exists(path))
                    Directory.Delete(path, true);
            }
            catch (Exception)
            {
#if DEBUG
                throw;
#else
                MessageBox.Show(string.Format("Not able to delete folder {0}, please go to the location and manually delete it", path));
#endif
            }
        }

        /// <summary>
        /// Checks if a directory exists
        /// </summary>
        /// <param name="path"></param>
        /// <returns></returns>
        public static bool LocationExists(this string path)
        {
            return Directory.Exists(path);
        }

        /// <summary>
        /// Checks if a file exists
        /// </summary>
        /// <param name="filePath"></param>
        /// <returns></returns>
        public static bool FileExists(this string filePath)
        {
            return File.Exists(filePath);
        }

        /// <summary>
        /// Open a directory window (using the OS's default handler, usually explorer)
        /// </summary>
        /// <param name="fileOrFolderPath"></param>
        public static void OpenPath(string fileOrFolderPath)
        {
            var psi = new ProcessStartInfo
            {
                FileName = FileExplorerProgramName, UseShellExecute = true, Arguments = '"' + fileOrFolderPath + '"'
            };
            try
            {
                if (LocationExists(fileOrFolderPath) || FileExists(fileOrFolderPath))
                    Process.Start(psi);
            }
            catch (Exception)
            {
#if DEBUG
                throw;
#else
                MessageBox.Show(string.Format("Unable to open the path {0}, please check if it exists", fileOrFolderPath));
#endif
            }
        }

        /// <summary>
        /// Open a file with associated application
        /// </summary>
        /// <param name="filePath">File path</param>
        /// <param name="workingDir">Working directory</param>
        /// <param name="asAdmin">Open as Administrator</param>
        public static void OpenFile(string filePath, string workingDir = "", bool asAdmin = false)
        {
            var psi = new ProcessStartInfo
            {
                FileName = filePath,
                UseShellExecute = true,
                WorkingDirectory = workingDir,
                Verb = asAdmin ? "runas" : string.Empty
            };
            try
            {
                if (FileExists(filePath))
                    Process.Start(psi);
            }
            catch (Exception)
            {
#if DEBUG
                throw;
#else
                MessageBox.Show(string.Format("Unable to open the path {0}, please check if it exists", filePath));
#endif
            }
        }

        ///<summary>
        /// This checks whether a given string is a zip file path.
        /// By default does not check if the zip file actually exist on disk, can do so by
        /// setting checkFileExists = true.
        ///</summary>
        public static bool IsZipFilePath(string querySearchString, bool checkFileExists = false)
        {
            if (IsLocationPathString(querySearchString) && querySearchString.Split('.').Last() == "zip")
            {
                if (checkFileExists)
                    return FileExists(querySearchString);

                return true;
            }

            return false;
        }

        ///<summary>
        /// This checks whether a given string is a directory path or network location string. 
        /// It does not check if location actually exists.
        ///</summary>
        public static bool IsLocationPathString(this string querySearchString)
        {
            if (string.IsNullOrEmpty(querySearchString) || querySearchString.Length < 3)
                return false;

            // // shared folder location, and not \\\location\
            if (querySearchString.StartsWith(@"\\")
                && querySearchString[2] != '\\')
                return true;

            // c:\
            if (char.IsLetter(querySearchString[0])
                && querySearchString[1] == ':'
                && querySearchString[2] == '\\')
            {
                return querySearchString.Length == 3 || querySearchString[3] != '\\';
            }

            return false;
        }

        ///<summary>
        /// Gets the previous level directory from a path string.
        /// Checks that previous level directory exists and returns it 
        /// as a path string, or empty string if doesn't exist
        ///</summary>
        public static string GetPreviousExistingDirectory(Func<string, bool> locationExists, string path)
        {
            var index = path.LastIndexOf('\\');
            if (index > 0 && index < (path.Length - 1))
            {
                string previousDirectoryPath = path.Substring(0, index + 1);
                return locationExists(previousDirectoryPath) ? previousDirectoryPath : "";
            }
            else
            {
                return "";
            }
        }

        ///<summary>
        /// Returns the previous level directory if path incomplete (does not end with '\').
        /// Does not check if previous level directory exists.
        /// Returns passed in string if is complete path
        ///</summary>
        public static string ReturnPreviousDirectoryIfIncompleteString(string path)
        {
            if (!path.EndsWith("\\"))
            {
                // not full path, get previous level directory string
                var indexOfSeparator = path.LastIndexOf('\\');

                return path.Substring(0, indexOfSeparator + 1);
            }

            return path;
        }

        /// <summary>
        /// Returns if <paramref name="parentPath"/> contains <paramref name="subPath"/>. Equal paths are not considered to be contained by default.
        /// From https://stackoverflow.com/a/66877016
        /// </summary>
        /// <param name="parentPath">Parent path</param>
        /// <param name="subPath">Sub path</param>
        /// <param name="allowEqual">If <see langword="true"/>, when <paramref name="parentPath"/> and <paramref name="subPath"/> are equal, returns <see langword="true"/></param>
        /// <returns></returns>
        public static bool PathContains(this string parentPath, string subPath, bool allowEqual = false)
        {
            var rel = Path.GetRelativePath(parentPath.EnsureTrailingSlash(), subPath);
            return (rel != "." || allowEqual)
                   && rel != ".."
                   && !rel.StartsWith("../")
                   && !rel.StartsWith(@"..\")
                   && !Path.IsPathRooted(rel);
        }

        /// <summary>
        /// Returns path ended with "\"
        /// </summary>
        /// <param name="path"></param>
        /// <returns></returns>
        public static string EnsureTrailingSlash(this string path)
        {
            return path.TrimEnd(Path.DirectorySeparatorChar) + Path.DirectorySeparatorChar;
        }
    }
}