using System;
using System.Collections.Generic;
using System.Text;
using Microsoft.Build.Utilities;
using Microsoft.Build.Framework;

namespace Tools.MSBuildTasks
{
    /// <summary>
    /// From: http://ozgrant.com/2008/04/04/createguid-msbuild-task/
    /// 
    /// This task creates a new GUID using System.Guid.NewGuid()
    /// 
    /// The Format parameter is optional.
    /// 
    /// <example>
    ///     <CreateGuid Format="D">
    ///       <Output TaskParameter="Output" PropertyName="MyGuid" />
    ///     </CreateGuid>
    /// 
    ///     <Message Text="Guid: $(MyGuid)" />
    ///     
    /// </example>
    /// </summary>
    public class CreateGuid : Task
    {
        /// <summary>
        /// The format specifier of the GUID.
        /// Must be one of "N" "D" "B" "P" ""
        /// Default is "D"
        /// 
        /// N = 32 digits: xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
        /// D = 32 digits separated by hyphens: xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx
        /// B = 32 digits separated by hyphens, enclosed in brackets: {xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx}
        /// P = 32 digits separated by hyphens, enclosed in parentheses: (xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx) 
        /// </summary>
        public String Format { get; set; }

        /// <summary>
        /// Outputs a new GUID in the default format: d36dda5f-1e18-4848-9407-2d733e8f680f
        /// </summary>
        [Output]
        public String Output { get; set; }

        public override bool Execute()
        {
            try
            {
                Output = Guid.NewGuid().ToString(Format); 
                Log.LogMessage("GUID Created: {0}", Output);
            }
            catch (FormatException e)
            {
                Log.LogErrorFromException(e);
                return false;
            }

            return true;
        }
    }
}