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// SparkleShare, a collaboration and sharing tool.
// Copyright (C) 2010 Hylke Bons <hylkebons@gmail.com>
//
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with this program. If not, see <http://www.gnu.org/licenses/>.


using System;
using System.Collections.Generic;
using System.Diagnostics;
using System.IO;
using System.Security.Cryptography;
using System.Threading;

namespace SparkleLib {

    // Sets up a fetcher that can get remote folders
    public abstract class SparkleFetcherBase {

        public event Action Started = delegate { };
        public event Action Failed = delegate { };

        public event FinishedEventHandler Finished = delegate { };
        public delegate void FinishedEventHandler (bool repo_is_encrypted, bool repo_is_empty, string [] warnings);

        public event ProgressChangedEventHandler ProgressChanged = delegate { };
        public delegate void ProgressChangedEventHandler (double percentage);


        public abstract bool Fetch ();
        public abstract void Stop ();
        public abstract bool IsFetchedRepoEmpty { get; }
        public abstract bool IsFetchedRepoPasswordCorrect (string password);
        public abstract void EnableFetchedRepoCrypto (string password);

        public Uri RemoteUrl { get; protected set; }
        public string RequiredFingerprint { get; protected set; }
        public readonly bool FetchPriorHistory = false;
        public string TargetFolder { get; protected set; }
        public bool IsActive { get; private set; }
        public string Identifier;

        public string [] Warnings {
            get {
                return this.warnings.ToArray ();
            }
        }

        public string [] Errors {
            get {
                return this.errors.ToArray ();
            }
        }

        
        protected List<string> warnings = new List<string> ();
        protected List<string> errors = new List<string> ();

        protected string [] ExcludeRules = new string [] {
            "*.autosave", // Various autosaving apps
            "*~", // gedit and emacs
            ".~lock.*", // LibreOffice
            "*.part", "*.crdownload", // Firefox and Chromium temporary download files
            ".*.sw[a-z]", "*.un~", "*.swp", "*.swo", // vi(m)
            ".directory", // KDE
            ".DS_Store", "Icon\r\r", "._*", ".Spotlight-V100", ".Trashes", // Mac OS X
            "*(Autosaved).graffle", // Omnigraffle
            "Thumbs.db", "Desktop.ini", // Windows
            "~*.tmp", "~*.TMP", "*~*.tmp", "*~*.TMP", // MS Office
            "~*.ppt", "~*.PPT", "~*.pptx", "~*.PPTX",
            "~*.xls", "~*.XLS", "~*.xlsx", "~*.XLSX",
            "~*.doc", "~*.DOC", "~*.docx", "~*.DOCX",
            "*/CVS/*", ".cvsignore", "*/.cvsignore", // CVS
            "/.svn/*", "*/.svn/*", // Subversion
            "/.hg/*", "*/.hg/*", "*/.hgignore", // Mercurial
            "/.bzr/*", "*/.bzr/*", "*/.bzrignore" // Bazaar
        };


        private Thread thread;


        public SparkleFetcherBase (string server, string required_fingerprint,
            string remote_path, string target_folder, bool fetch_prior_history)
        {
            RequiredFingerprint = required_fingerprint;
            FetchPriorHistory = fetch_prior_history;
            remote_path = remote_path.Trim ("/".ToCharArray ());

            if (server.EndsWith ("/"))
                server = server.Substring (0, server.Length - 1);

            if (!remote_path.StartsWith ("/"))
                remote_path = "/" + remote_path;

            if (!server.Contains ("://"))
                server = "ssh://" + server;

            TargetFolder = target_folder;
            RemoteUrl = new Uri (server + remote_path);
            IsActive = false;
        }


        public void Start ()
        {
            IsActive = true;
            Started ();

            SparkleLogger.LogInfo ("Fetcher", TargetFolder + " | Fetching folder: " + RemoteUrl);

            if (Directory.Exists (TargetFolder))
                Directory.Delete (TargetFolder, true);

            string host_key = "";

            if (!RemoteUrl.Scheme.StartsWith ("http")) {
                host_key = FetchHostKey ();
                
                if (string.IsNullOrEmpty (RemoteUrl.Host) || host_key == null) {
                    Failed ();
                    return;
                }
            
                bool warn = true;
                if (RequiredFingerprint != null) {
                    string host_fingerprint = DeriveFingerprint (host_key);

                    if (host_fingerprint == null || !RequiredFingerprint.Equals (host_fingerprint)) {
                        SparkleLogger.LogInfo ("Auth", "Fingerprint doesn't match");

                        this.errors.Add ("error: Host fingerprint doesn't match");
                        Failed ();

                        return;
                    }

                    warn = false;
                    SparkleLogger.LogInfo ("Auth", "Fingerprint matches");

                } else {
                   SparkleLogger.LogInfo ("Auth", "Skipping fingerprint check");
                }

                AcceptHostKey (host_key, warn);
            }

            this.thread = new Thread (() => {
                if (Fetch ()) {
                    Thread.Sleep (500);
                    SparkleLogger.LogInfo ("Fetcher", "Finished");

                    IsActive = false;

                    bool repo_is_encrypted = RemoteUrl.AbsolutePath.Contains ("-crypto");
                    Finished (repo_is_encrypted, IsFetchedRepoEmpty, Warnings);

                } else {
                    Thread.Sleep (500);
                    SparkleLogger.LogInfo ("Fetcher", "Failed");

                    IsActive = false;
                    Failed ();
                }
            });

            this.thread.Start ();
        }


        public virtual void Complete ()
        {
            string identifier_path = Path.Combine (TargetFolder, ".sparkleshare");

            if (File.Exists (identifier_path)) {
                Identifier = File.ReadAllText (identifier_path).Trim ();

            } else {
                Identifier = CreateIdentifier ();
                File.WriteAllText (identifier_path, Identifier);

                CreateInitialChangeSet ();
            }
        }


        // Create an initial change set when the
        // user has fetched an empty remote folder
        private void CreateInitialChangeSet ()
        {
            string file_path = Path.Combine (TargetFolder, "SparkleShare.txt");
            string n = Environment.NewLine;

            UriBuilder uri_builder = new UriBuilder (RemoteUrl);

            if (RemoteUrl.Scheme.StartsWith ("http")) {
                uri_builder.UserName = "";
                uri_builder.Password = "";
            }

            bool repo_is_encrypted = RemoteUrl.AbsolutePath.Contains ("-crypto");
            string text;

            if (repo_is_encrypted) {
                text = GenerateCryptoSalt () + " Secret project! " + GenerateCryptoSalt ();

            } else {
                text = "Congratulations, you've successfully created a SparkleShare repository!" + n +
                    n +
                    "Any files you add or change in this folder will be automatically synced to " + n +
                    uri_builder.ToString () + " and everyone connected to it." + n +
                    n +
                    "SparkleShare is an Open Source software program that helps people " + n +
                    "collaborate and share files. If you like what we do, please consider a small " + n +
                    "donation to support the project: http://www.sparkleshare.org/" + n +
                    n +
                    "Have fun! :)" + n;
            }

            File.WriteAllText (file_path, text);
        }


        public static string CreateIdentifier ()
        {
            string random = Path.GetRandomFileName ();
            return random.SHA1 ();
        }


        public void Dispose ()
        {
            if (this.thread != null)
                this.thread.Abort ();
        }


        protected void OnProgressChanged (double percentage) {
            ProgressChanged (percentage);
        }


        protected string GenerateCryptoSalt ()
        {
            string salt = Path.GetRandomFileName ().SHA1 ();
            return salt.Substring (0, 16);
        }


        private string FetchHostKey ()
        {
            string host = RemoteUrl.Host;
            int port = RemoteUrl.Port;

            if (port < 1)
                port = 22;

            SparkleLogger.LogInfo ("Auth", "Fetching host key for " + host);

            Process process = new Process () {
                EnableRaisingEvents = true
            };

            process.StartInfo.FileName = "ssh-keyscan";
            process.StartInfo.Arguments = "-t rsa -p " + port + " " + host;
            process.StartInfo.WorkingDirectory = SparkleConfig.DefaultConfig.TmpPath;
            process.StartInfo.UseShellExecute = false;
            process.StartInfo.RedirectStandardOutput = true;
            process.StartInfo.CreateNoWindow = true;

            process.Start ();

            // Reading the standard output HAS to go before
            // WaitForExit, or it will hang forever on output > 4096 bytes
            string host_key = process.StandardOutput.ReadToEnd ().Trim ();
            process.WaitForExit ();

            if (process.ExitCode == 0 && !string.IsNullOrEmpty (host_key))
                return host_key;
            else
                return null;
        }


        private string DeriveFingerprint (string public_key)
        {
            try {
                MD5 md5 = new MD5CryptoServiceProvider ();
                string key = public_key.Split (" ".ToCharArray ()) [2];
                byte [] b64_bytes = Convert.FromBase64String (key);
                byte [] md5_bytes = md5.ComputeHash (b64_bytes);
                string fingerprint = BitConverter.ToString (md5_bytes);

                return fingerprint.ToLower ().Replace ("-", ":");

            } catch (Exception e) {
                SparkleLogger.LogInfo ("Fetcher", "Failed creating fingerprint: " + e.Message + e.StackTrace);
                return null;
            }
        }


        private void AcceptHostKey (string host_key, bool warn)
        {
            string ssh_config_path = Path.Combine (SparkleConfig.DefaultConfig.HomePath, ".ssh");
            string known_hosts_file_path = Path.Combine (ssh_config_path, "known_hosts");

            if (!File.Exists (known_hosts_file_path)) {
                if (!Directory.Exists (ssh_config_path))
                    Directory.CreateDirectory (ssh_config_path);

                File.Create (known_hosts_file_path).Close ();
            }

            string host = RemoteUrl.Host;
            string known_hosts = File.ReadAllText (known_hosts_file_path);
            string [] known_hosts_lines = File.ReadAllLines (known_hosts_file_path);

            foreach (string line in known_hosts_lines) {
                if (line.StartsWith (host + " "))
                    return;
            }

            if (known_hosts.EndsWith ("\n"))
                File.AppendAllText (known_hosts_file_path, host_key + "\n");
            else
                File.AppendAllText (known_hosts_file_path, "\n" + host_key + "\n");

            SparkleLogger.LogInfo ("Auth", "Accepted host key for " + host);

            if (warn)
                this.warnings.Add ("The following host key has been accepted:\n" + DeriveFingerprint (host_key));
        }


        public static string GetBackend (string path)
        {
            string extension = Path.GetExtension (path);
            
            if (!string.IsNullOrEmpty (extension)) {
                extension = extension.Substring (1);
                char [] letters = extension.ToCharArray ();
                letters [0] = char.ToUpper (letters [0]);
                
                return new string (letters);
                
            } else {
                return "Git";
            }
        }
    }
}
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