using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Text;
using Perforce.P4;
using log4net;
using log4net.Appender;
using log4net.Config;

namespace P4NetContentTrigger
{
 
    class P4SubmitContentTrigger
    {
        private static readonly ILog _log = LogManager.GetLogger(typeof(P4SubmitContentTrigger));

        private void ReportError(string msg)
        {
            _log.Error(msg);
            Console.WriteLine(msg);
            Console.Error.WriteLine(msg);
        }

        public int Validate(CmdLineOptions options)
        {
            P4Interface p4 = null;
            try
            {
                p4 = new P4Interface(options.Port, options.User);
                if (!p4.Connect())
                {
                    ReportError("Failed to connect");
                    return 1;
                }

                _log.InfoFormat("Processing changelist: {0}", options.Change);

                Changelist change = p4.repo.GetChangelist(options.Change, new Perforce.P4.Options());
                // Following section get's the content of each file into a local temp
                foreach (var file in change.Files)
                {
                    var depotPath = file.DepotPath.ToString();
                    _log.InfoFormat("File: {0}", depotPath);
                    if (string.IsNullOrEmpty(depotPath))
                        break;
                    var path = Path.GetTempPath();
                    var tempFileName = Guid.NewGuid().ToString();
                    var tempFilePath = Path.Combine(path, tempFileName);
                    var fcoptions = new GetFileContentsCmdOptions(GetFileContentsCmdFlags.None, tempFilePath);
                    var contentVer = new ShelvedInChangelistIdVersion(options.Change);
                    var spec = new FileSpec(new DepotPath(depotPath), contentVer);
                    var results = p4.repo.GetFileContents(fcoptions, spec);
                    if (options.Testing)
                    {
                        // Decide what to do based on contents of files - in test mode only
                        using (var reader = new StreamReader(tempFilePath))
                        {
                            var line = reader.ReadLine();
                            _log.DebugFormat("First line of file: {0}", line);
                            if (line.ToLower().Contains("fail"))
                            {
                                ReportError("Testing: Trigger failed");
                                return 1;
                            }
                        }
                        _log.Debug("File contents read and validated successfully");
                    }
                    else
                    {
                        // TODO - the real content validation as desired when not in test mode.
                    }
                }
                return 0;
            }
            catch (Exception ex)
            {
                ReportError(ex.Message);
                if (ex.Message.Contains("Perforce password (P4PASSWD) invalid or unset"))
                {
                    string p4user = "unknown";
                    if (p4 != null)
                    {
                        p4user = p4.repo.Connection.UserName;
                    }
                    string msg = string.Format(
@"Password error during trigger execution.
Please inform your administrator and ask them to check:
- 'p4 triggers' definition
- P4TICKET value for user '{0}'
- server log file.", p4user);
                    ReportError(msg);
                }
                else
                {
                    _log.Error(ex.StackTrace);
                }
                return 1;
            }
        }

    }
}