// Example .NET bindings for Svn.RA
//
// Written by Jelmer Vernooij, 2006.
//
// Compile with:
//
// mcs /unsafe ra.cs
//
// Run like:
//
// mono ra.exe file://path/to/local/repository
//
// Example output:
//
// Latest revision of file:///home/jelmer/foo is 3

using System;
using System.Collections;
using System.Runtime.InteropServices;

namespace Subversion.Remote
{
	public class Session {
		[DllImport("libsvn_ra-1.so")] 
			internal static extern IntPtr svn_ra_open2(
				out IntPtr ctx, string repos_url, IntPtr callbacks,
				IntPtr callback_baton, IntPtr config, IntPtr pool);

		[DllImport("libsvn_ra-1.so")] 
			internal static extern IntPtr svn_ra_get_latest_revnum(
				IntPtr ctx, out long latest_revnum, IntPtr pool);

		[DllImport("libsvn_ra-1.so")] 
			internal static extern IntPtr svn_ra_initialize(IntPtr pool);

		[DllImport("libapr.so.0")] 
			internal static extern int apr_initialize();

		[DllImport("libapr.so.0")] 
			internal static extern int apr_pool_create_ex(
				ref IntPtr new_pool, IntPtr old_pool, 
				IntPtr abortfn, IntPtr allocater);

		public string url;

		public IntPtr ra_ctx;
		public static IntPtr pool = IntPtr.Zero;

		static Session() {
			apr_initialize();
			apr_pool_create_ex(ref pool, IntPtr.Zero, IntPtr.Zero, IntPtr.Zero);
			svn_ra_initialize(pool);
		}

		/// <summary>
		/// Connect to a Remote Subversion server.
		/// </summary>
		public Session(string url) {
			this.url = url;
			
			svn_ra_open2(out ra_ctx, url, IntPtr.Zero, IntPtr.Zero, IntPtr.Zero,
						pool);
		}

		public long GetLatestRevnum()
		{
			long revnum;
			svn_ra_get_latest_revnum(ra_ctx, out revnum, pool);
			return revnum;
		}

		public static void Main(string[] args) {
			Session s = new Session(args[0]);
			Console.WriteLine("Latest revision of {0} is {1}", args[0], 
						  s.GetLatestRevnum());
		}
	}
}