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using System;
using System.Collections.Generic;
using System.Configuration;
using System.Diagnostics;
using System.IO;
using System.Linq;
using System.Xml.Linq;
using CommandLine;
using CommandLine.Text;

namespace AccuRev2Git
{
class Options
{
[Option("d", "depot", HelpText = "Name of the AccuRev depot.", Required = true)]
public string DepotName { get; set; }

[Option("s", "stream", HelpText = "Name of the AccuRev stream.", DefaultValue = "")]
public string StreamName { get; set; }

[Option("w", "workingDir", HelpText = "Working directory of [new] git repo.", Required = true)]
public string WorkingDir { get; set; }

[Option("t", "startingTran", HelpText = "AccuRev transaction to start from.", DefaultValue = null)]
public int? StartingTransaction { get; set; }

[Option("r", "resume", HelpText = "Resume from last transaction completed.", DefaultValue = false)]
public bool Resume { get; set; }

[Option("u", "username", HelpText = "AccuRev username.", DefaultValue = null)]
public string AccuRevUserName { get; set; }

[Option("p", "password", HelpText = "AccuRev password.", DefaultValue = null)]
public string AccuRevPassword { get; set; }
}

class Program
{
private static Options _options = new Options();
private static string _accurevUsername;
private static List<GitUser> _gitUsers;

public static void Main(string[] args)
{
if (args == null || !CommandLineParser.Default.ParseArguments(args, _options))
{
Console.WriteLine(HelpText.AutoBuild(_options));
return;
}

var depotName = _options.DepotName;
var streamName = _options.StreamName;
var workingDir = _options.WorkingDir;
var startingTran = _options.StartingTransaction;
var resume = _options.Resume;

accurevLogin(_options);
loadUsers();
loadDepotFromScratch(depotName, streamName, workingDir, startingTran, resume);
}

private static void accurevLogin(Options options)
{
Console.WriteLine("AccuRev Login...");
_accurevUsername = options.AccuRevUserName;
if (string.IsNullOrEmpty(_accurevUsername))
{
Console.Write("Username: ");
_accurevUsername = Console.ReadLine();
}
var password = options.AccuRevPassword;
if (string.IsNullOrEmpty(password))
{
Console.Write("Password: ");
password = Console.ReadLine();
}
execAccuRev(string.Format("login -n {0} \"{1}\"", _accurevUsername, password), string.Empty);
}

private static void loadUsers()
{
if (!File.Exists("users.txt"))
throw new ApplicationException("No \"users.txt\" file found!");

var usersRaw = File.ReadAllLines("users.txt");
_gitUsers = new List<GitUser>(usersRaw.Length);
foreach (var parts in usersRaw.Where(userRaw => !string.IsNullOrEmpty(userRaw) && !userRaw.StartsWith("#")).Select(userRaw => userRaw.Split('|')))
_gitUsers.Add(new GitUser(parts[0], parts[1], parts[2]));
}

static void loadDepotFromScratch(string depotName, string streamName, string workingDir, int? startingTransaction, bool resume)
{
var xdoc = new XDocument();

var tempFile = string.Format("_{0}_{1}_.depot.hist.xml", depotName, streamName);
if (File.Exists(tempFile))
{
if (resume)
{
xdoc = XDocument.Load(tempFile);
}
else
{
Console.Write("Existing history file found. Re-use it? [y|n] ");
// ReSharper disable PossibleNullReferenceException
if (Console.ReadLine().ToUpper() == "Y")
// ReSharper restore PossibleNullReferenceException
{
xdoc = XDocument.Load(tempFile);
}
}
}

if (xdoc.Document == null || xdoc.Nodes().Any() == false)
{
Console.WriteLine("Retrieving complete history of {0} depot, {1} stream, from AccuRev server...", depotName, streamName);
var temp = execAccuRev(string.Format("hist -p \"{0}\" -s \"{0}{1}\" -k promote -fx", depotName, (string.IsNullOrEmpty(streamName) ? "" : "_" + streamName)), workingDir);
File.WriteAllText(tempFile, temp);
xdoc = XDocument.Parse(temp);
}

var n = 0;
// ReSharper disable PossibleNullReferenceException
var nodes = xdoc.Document.Descendants("transaction").Where(t => Int32.Parse(t.Attribute("id").Value) >= startingTransaction).OrderBy(t => Int32.Parse(t.Attribute("id").Value));
if (resume)
{
Console.WriteLine("Attempting to resume from last completed transaction.");
int lastTransaction;
var result = execGitRaw("config --get accurev2git.lasttran", workingDir);
if (!Int32.TryParse(result, out lastTransaction))
throw new ApplicationException("Cannot resume - no last transaction was found in git config key 'accurev2git.lasttran'.");

Console.WriteLine("Resuming from last completed transaction {0}.", lastTransaction);
Console.WriteLine("Retrieving history as of {0} for {1} depot, {2} stream, from AccuRev server...", lastTransaction, depotName, streamName);
var temp = execAccuRev(string.Format("hist -p \"{0}\" -s \"{0}{1}\" -k promote -t {2}-now -fx", depotName, (string.IsNullOrEmpty(streamName) ? "" : "_" + streamName), lastTransaction), workingDir);
File.WriteAllText(tempFile, temp);
xdoc = XDocument.Parse(temp);

nodes = xdoc.Document.Descendants("transaction").Where(t => Int32.Parse(t.Attribute("id").Value) > lastTransaction).OrderBy(t => Int32.Parse(t.Attribute("id").Value));
try
{
startingTransaction = nodes.Select(t => Int32.Parse(t.Attribute("id").Value)).First();
}
catch (Exception)
{
Console.WriteLine("No transactions found after last transaction of {0}.", lastTransaction);
return;
}
}
else
{
startingTransaction = startingTransaction ?? 0;
}
var nCount = nodes.Count();
if (startingTransaction == 0)
{
var initialDate = long.Parse(nodes.First().Attribute("time").Value) - 60;
var defaultGitUserName = ConfigurationManager.AppSettings.Get("DefaultGitUserName");
var defaultGitUser = _gitUsers.SingleOrDefault(u => u.Name.Equals(defaultGitUserName, StringComparison.OrdinalIgnoreCase));
if (defaultGitUser == null)
throw new ApplicationException("Cannot initialize new repository without a DefaultGitUserName specified!");
if (Directory.Exists(Path.Combine(workingDir, ".git")))
throw new ApplicationException(string.Format("Cannot initialize new repository; repository already exists in '{0}'.", workingDir));
execGitRaw("init", workingDir);
File.WriteAllText(Path.Combine(workingDir, ".gitignore"), "#empty");
execGitRaw("add --all", workingDir);
execGitCommit(string.Format("commit --date={0} --author={1} -m \"Initial git commit.\"", initialDate, defaultGitUser), workingDir, initialDate.ToString(), defaultGitUser);
execGitRaw(string.Format("checkout -b \"{0}\"", streamName), workingDir, true);
}
foreach (var transaction in nodes)
{
n++;
var transactionId = Convert.ToInt32(transaction.Attribute("id").Value);
Console.Write("Loading transaction {0} of {1} [id={2}]\x0D", n.ToString("00000"), nCount, transactionId.ToString("00000"));
loadTransaction(depotName, streamName, transactionId, workingDir, transaction);
}
// ReSharper restore PossibleNullReferenceException
Console.WriteLine();
}

static void loadTransaction(string depotName, string streamName, int transactionId, string workingDir, XElement transaction)
{
// ReSharper disable PossibleNullReferenceException
var accurevUser = transaction.Attribute("user").Value;
var gitUser = translateUser(accurevUser);
var unixDate = long.Parse(transaction.Attribute("time").Value);
// ReSharper restore PossibleNullReferenceException
var issueNumNodes = transaction.Descendants("version").Descendants("issueNum");
var issueNums = (issueNumNodes == null || issueNumNodes.Count() == 0 ? string.Empty : issueNumNodes.Select(n => n.Value).Distinct().Aggregate(string.Empty, (seed, num) => seed + ", " + num).Substring(2));
var commentNode = transaction.Descendants("comment").FirstOrDefault();
var comment = (commentNode == null ? string.Empty : commentNode.Value);
comment = string.IsNullOrEmpty(comment) ? "[no original comment]" : comment;
var commentLines = comment.Split(new[] { "\n" }, 2, StringSplitOptions.None);
if (commentLines.Length > 1)
comment = commentLines[0] + Environment.NewLine + Environment.NewLine + commentLines[1];
comment += string.Format("{0}{0}[AccuRev Transaction #{1}]", Environment.NewLine, transactionId);
if (!string.IsNullOrEmpty(issueNums))
comment += string.Format("{0}[Issue #s: {1}]", Environment.NewLine, issueNums);
var commentFile = string.Format(".\\_{0}_Comment.txt", depotName);
var commentFilePath = Path.GetFullPath(commentFile);
File.WriteAllText(commentFile, comment);
execClean(workingDir);
execAccuRev(string.Format("pop -R -O -v \"{0}{1}\" -L . -t {2} .", depotName, (string.IsNullOrEmpty(streamName) ? "" : "_" + streamName), transactionId), workingDir);
execGitRaw("add --all", workingDir);
execGitCommit(string.Format("commit --date={0} --author={1} --file=\"{2}\"", unixDate, gitUser, commentFilePath), workingDir, unixDate.ToString(), gitUser);
execGitRaw(string.Format("config accurev2git.lasttran {0}", transactionId), workingDir);
}

static GitUser translateUser(string accurevUser)
{
return _gitUsers.SingleOrDefault(u => u.AccuRevUserName.Equals(accurevUser, StringComparison.OrdinalIgnoreCase));
}

/// <summary>
/// Depth-first recursive delete, with handling for descendant
/// directories open in Windows Explorer.
/// See http://stackoverflow.com/a/1703799/264822
/// </summary>
public static void deleteDirectory(string path)
{
foreach (string directory in Directory.GetDirectories(path))
{
deleteDirectory(directory);
}

try
{
Directory.Delete(path, true);
}
catch (IOException)
{
Directory.Delete(path, true);
}
catch (UnauthorizedAccessException)
{
Directory.Delete(path, true);
}
}

static void execClean(string workingDir)
{
foreach (var dir in Directory.GetDirectories(workingDir).Where(dir => !dir.EndsWith(".git")))
deleteDirectory(dir);
foreach (var file in Directory.GetFiles(workingDir).Where(file => !file.EndsWith(".gitignore")))
File.Delete(file);
}

static string execAccuRev(string arguments, string workingDir)
{
var accuRevPath = ConfigurationManager.AppSettings["AccuRevPath"];
var process = new Process
{
StartInfo = new ProcessStartInfo(accuRevPath, arguments)
};
if (!string.IsNullOrEmpty(workingDir))
process.StartInfo.WorkingDirectory = workingDir;
process.StartInfo.UseShellExecute = false;
process.StartInfo.CreateNoWindow = true;
process.StartInfo.RedirectStandardError = true;
process.StartInfo.RedirectStandardOutput = true;
if (!process.StartInfo.EnvironmentVariables.ContainsKey("ACCUREV_PRINCIPAL"))
process.StartInfo.EnvironmentVariables.Add("ACCUREV_PRINCIPAL", _accurevUsername);
process.Start();
var result = process.StandardOutput.ReadToEnd();
if (process.StandardError.EndOfStream == false)
{
var errors = process.StandardError.ReadToEnd();
if (!errors.Contains("is defunct") && !errors.Contains("No element named") && !errors.Contains("Unable to proceed with annotate.") && !errors.Contains("Specified version not found for:"))
{
Debug.WriteLine(errors);
throw new ApplicationException(string.Format("AccuRev has returned an error: {0}", errors));
}
}
return result;
}

static string execGitRaw(string arguments, string workingDir, bool ignoreErrors = false)
{
var gitPath = ConfigurationManager.AppSettings["GitPath"];
var process = new Process
{
StartInfo = new ProcessStartInfo(gitPath, arguments)
};
if (!string.IsNullOrEmpty(workingDir))
process.StartInfo.WorkingDirectory = workingDir;
process.StartInfo.UseShellExecute = false;
process.StartInfo.CreateNoWindow = true;
process.StartInfo.RedirectStandardError = true;
process.StartInfo.RedirectStandardOutput = true;
process.Start();
var output = process.StandardOutput.ReadToEnd();
if (!ignoreErrors && process.StandardError.EndOfStream == false)
{
var errors = process.StandardError.ReadToEnd();
throw new ApplicationException(string.Format("Git has returned an error: {0}", errors));
}
return output;
}

static void execGitCommit(string arguments, string workingDir, string commitDate, GitUser gitUser)
{
var gitPath = ConfigurationManager.AppSettings["GitPath"];
var process = new Process
{
StartInfo = new ProcessStartInfo(gitPath, arguments)
};
if (!string.IsNullOrEmpty(workingDir))
process.StartInfo.WorkingDirectory = workingDir;
process.StartInfo.EnvironmentVariables.Add("GIT_COMMITTER_DATE", commitDate);
process.StartInfo.EnvironmentVariables.Add("GIT_COMMITTER_NAME", gitUser.Name);
process.StartInfo.EnvironmentVariables.Add("GIT_COMMITTER_EMAIL", gitUser.Email);
process.StartInfo.UseShellExecute = false;
process.StartInfo.CreateNoWindow = true;
process.StartInfo.RedirectStandardError = true;
process.StartInfo.RedirectStandardOutput = true;
process.Start();
var output = process.StandardOutput.ReadToEnd();
if (process.StandardError.EndOfStream == false)
{
var errors = process.StandardError.ReadToEnd();
throw new ApplicationException(string.Format("Git has returned an error: {0}", errors));
}
}

internal class GitUser
{
public string Name { get; set; }
public string Email { get; set; }
public string AccuRevUserName { get; set; }

public GitUser(string accuRevUserName, string name, string email)
{
Name = name;
Email = email;
AccuRevUserName = accuRevUserName;
}

public override string ToString()
{
return string.Format("\"{0} <{1}>\"", Name, Email);
}
}
}
}
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