using System;
using System.Globalization;
using System.Linq;
using System.Net.Mail;
using System.Text;
using Microsoft.Build.Framework;
using Microsoft.Build.Utilities;

namespace Jesper.MsbuildTasks
{
  public class SendMail: Task
  {
    [Required]
    public ITaskItem[] To { get; set; }
    public ITaskItem[] Contents { get; set; }
    public string Subject { get; set; }
    [Required]
    public string Host { get; set; }
    public string Port { get; set; }
    public string From { get; set; }

    private StringBuilder CreateContents()
    {
      var result = new StringBuilder();
      result.AppendLine("[[Sent from fxCop]]");
      if (Contents != null)
      {
        foreach (var content in Contents)
        {
          result.AppendLine(content.ItemSpec);
        }
      }
      Log.LogMessage(MessageImportance.Low, "Message contents: {0}", result);

      return result;
    }
    public override bool Execute()
    {
      var client = new SmtpClient(Host, ActualPort) {DeliveryMethod = SmtpDeliveryMethod.Network};

      Log.LogMessage(MessageImportance.Normal, "Sending via {0}:{1}", Host, ActualPort);
      try
      {
        client.Send(CreateMessage());
        return true;
      }
      catch (Exception e)
      {
        Log.LogErrorFromException(e);
        return false;
      }
    }

    protected int ActualPort
    {
      get
      {
        int port;
        return int.TryParse(Port, NumberStyles.Integer, CultureInfo.InvariantCulture, out port) ? port : 25;
      }
    }

    private MailMessage CreateMessage()
    {
      var result = new MailMessage {From = new MailAddress(From), Body = CreateContents().ToString(), Subject = ActualSubject};
      foreach (var r in To.Select(recipient => new MailAddress(recipient.ItemSpec)))
      {
        Log.LogMessage(MessageImportance.Normal, "Sending to {0}", r);
        result.To.Add(r);
      }
      return result;
    }

    protected string ActualSubject
    {
      get { return Subject ?? "Sent from fxcop"; }
    }
  }
}