// valac -o /tmp/ggit Git.vala --pkg libgit2-glib-1.0 --pkg libsoup-2.4 --pkg gee-0.8 -g
 

void main()
{
	 GLib.Log.set_handler(null, 
            GLib.LogLevelFlags.LEVEL_DEBUG | GLib.LogLevelFlags.LEVEL_WARNING | GLib.LogLevelFlags.LEVEL_INFO, 
            (dom, lvl, msg) => {
					
					
               // should we debug..
					
      			
               print("%s\n", msg);
            }
         ); 

	
	Ggit.init();
	var a = new GitLive.Repo("/home/alan/gitlive/gitlive");
	a.diffhead();
	//a.fetchAll();
	return;
	/*
	GLib.Timeout.add (1, () => {
      GLib.debug("Meanwhile");
      return true;
    }, GLib.Priority.HIGH);
	
	var loop = new MainLoop();
	 
	var a = new GitLive.Repo("/home/alan/gitlive/web.coba");
      GLib.debug("Starting");	
	a.loadRemoteHeads.begin(true, (obj,res) => {
		a.loadRemoteHeads.end(res);
		 GLib.debug("got results");
		a.loadLocalBranches();
		loop.quit();
	});
	loop.run();
	//a.mergeMasterIntoHead();
	//a.walkDiff();
	//return;
	//a.is_managed();
	//a.is_autocommit();
	

	//a.fetchAll();
	//
	/*
	var a = new GitLive.Repo("/home/alan/git/test1-clone");
	//a.fetchAll();
	var str = (new GLib.DateTime.now_utc()).format("%Y-%m-%d %H:%M:%S");
	GLib.FileUtils.set_contents("/home/alan/git/test1-clone/test1",  str); 
	
	var ix = a.repo.get_index();
	ix.add_path("test1");
	ix.write();
	var treeoid = ix.write_tree();

	var head = a.repo.get_head();
	var parent = head.lookup() as Ggit.Commit;
	Ggit.Commit[] parents = (parent == null) ? 
		new Ggit.Commit[] {} :
		new Ggit.Commit[] { parent };

	var tree = a.repo.lookup(treeoid,typeof (Ggit.Tree))  as   Ggit.Tree;// odd format.. 
	
	var sig = new Ggit.Signature.now("Alan Knowles", "alan@roojs.com");
	a.repo.create_commit("HEAD", sig, sig, null, "test commit " + str, tree, parents);
	*/
	// mmh.. no git add/commit in library...
//	string[] spawn_args = {"git", "commit", "-m", "test", "-a"};
	//string[] spawn_env = Environ.get ();
//	Process.spawn_sync ("/home/alan/git/test1-clone", spawn_args, spawn_env, SpawnFlags.SEARCH_PATH, null);
 
	//a.pushAll();
}
 

namespace  GitLive {

	public class Repo : Object {

		string name = "";
		public Ggit.Repository  repo;
		Callbacks callbacks;

		public Repo(string path)
		{
			this.name = GLib.Path.get_basename(path);
			this.repo = Ggit.Repository.open(GLib.File.new_for_path(path));
			this.callbacks = new Callbacks(this);
		
		}
		Ggit.Branch						head = null;
  	    Gee.ArrayList<Ggit.Branch> 		branches = null;
  	    Ggit.RemoteHead[] 				remote_heads = null;
		public void loadLocalBranches(bool force = false)
		{
			if (!force && this.branches != null) {
				return;
			}
			
			this.branches =  new Gee.ArrayList<Ggit.Branch>();
			var r = this.repo.enumerate_branches(Ggit.BranchType.LOCAL);
			while (r.next()) {
				var br = r.get() as Ggit.Branch;
				if (br == null) {
					continue;
				}
				if (br.is_tag()) {
					continue;
				}
				
				//var head = this.repo.revparse("refs/heads/" + br.get_name() ).get_id();
				//var rhead = this.repo.revparse(br.get_upstream().get_name() ).get_id();
				try {
					GLib.debug("got branch: N=%s", br.get_name() );
					GLib.debug("is_head %s", br.is_head() ? "Y" : "n");

					GLib.debug("upstream = %s", br.get_upstream() == null ? "??" : br.get_upstream().get_name().substring(20));
					GLib.debug("oid = %s",br.get_target().to_string());
					this.branches.add(br);
					if (br.is_head()) {
						GLib.debug("HEAD= %s", br.get_name());
						this.head = br;
					}
				} catch (Error e) {
					GLib.debug("Skip branch");
				}
			}
			
			
		}
		 
		public bool is_managed()
		{
			GLib.debug("is_managed: %d", this.repo.get_config().get_int32("gitlive.managed"));
			return this.repo.get_config().get_int32("gitlive.managed") == 1;
		}
		
		
		public bool is_autocommit ()
		{    	
			GLib.debug("is_autocommit: %d", this.repo.get_config().get_int32("gitlive.autocommit"));
			return this.repo.get_config().get_int32("gitlive.autocommit") == 1;
		}
		public void set_autocommit(bool val)
		{
	 		this.repo.get_config().set_int32("gitlive.autocommit", val ? 1 : 0);
		
		}
		 
		public void walkDiff()
		{
			this.loadLocalBranches();
			
			
			
			var oid =  this.repo.revparse(this.head.get_name() ).get_id()  ;
			var moid =  this.repo.revparse("refs/heads/master" ).get_id()  ;
			
			var a = new Ggit.RevisionWalker(this.repo);
			a.set_sort_mode(Ggit.SortMode.TOPOLOGICAL);
			a.push(oid);
			a.hide(moid);
			var last = oid;
			for (var noid = a.next(); noid != null; noid= a.next()) {
				//var commit = this.repo.lookup(noid, typeof(Ggit.Commit)) as Ggit.Commit;
				GLib.debug("rev: %s",
					noid.to_string()
				);
				last = noid;
			}
			var commit = this.repo.lookup(last, typeof(Ggit.Commit)) as Ggit.Commit;
			var parent = commit.get_parents();
			GLib.debug("parent = %s", parent.get_id(0).to_string());
			var master_rev =  parent.get_id(0);
			var master_commit  = this.repo.lookup_commit(master_rev);;
			
			var head_commit = this.repo.lookup_commit(oid);
			
			var master_tree = master_commit.get_tree();
			var head_tree = head_commit.get_tree();
			
			var diff = new Ggit.Diff.tree_to_tree(this.repo, master_tree, head_tree, new Ggit.DiffOptions());
			
			diff.print(Ggit.DiffFormatType.PATCH, ( delta,  hunk,  line) => {
				GLib.debug("%d: %s, %s", line.get_new_lineno(), line.get_origin().to_string(), line.get_text());
				return 0;
			});
			// let's try a merge..
			var mo = new Ggit.MergeOptions();
			mo.set_file_favor(Ggit.MergeFileFavor.THEIRS);
			var ix = this.repo.merge_trees(master_tree, master_tree, head_tree, mo);
			
			if (ix.has_conflicts()) {
				GLib.debug("merge has conflicts");
				return;
			}
			 var treeoid = ix.write_tree();
			 
			 
			  
			var parents =   new Ggit.Commit[] { master_commit };


			var new_tree = this.repo.lookup(treeoid,typeof (Ggit.Tree))  as   Ggit.Tree;
			
			var sig = new Ggit.Signature.now(
					this.repo.get_config().get_string("user.name"),
					this.repo.get_config().get_string("user.email")
			);
			
			
			
			this.repo.create_commit("HEAD", sig, sig, null, "Test Merge", new_tree, parents);
	 
			
			
		}
		
		public void diffhead()
		{
			var r = this.repo.enumerate_branches(Ggit.BranchType.LOCAL);
			Ggit.Branch? head = null;
			while (r.next()) {
				var gbr = r.get() as Ggit.Branch;
				if (gbr.is_head()) {
					head = gbr;
				}
			}
			GLib.debug("checking head=%s",head == null ? "EMPTY" :  head.get_name());
			var br = this.repo.lookup_branch(head.get_name(),Ggit.BranchType.LOCAL);
			var commit  = this.repo.lookup_commit(br.get_target());

			
			var diff = new Ggit.Diff.tree_to_workdir(this.repo, commit.get_tree(), new Ggit.DiffOptions());
			var ret = "";
			diff.print(Ggit.DiffFormatType.PATCH, (delta, hunk, line) => {
				switch(line.get_origin()) {
					case Ggit.DiffLineType.ADDITION: ret+="+"; break;
					case Ggit.DiffLineType.DELETION: ret+="-";break;
					case Ggit.DiffLineType.CONTEXT:  ret+=" ";break;
					case Ggit.DiffLineType.HUNK_HDR: break;					
					case Ggit.DiffLineType.FILE_HDR: break;
					default: ret+=" ";break;
				}
				ret += " " + line.get_text();
				return 0;
			});
			GLib.debug("%s", ret);
		}
		
		
		public void mergeMasterIntoHead()
		{
			// assumes head is not master...
			this.loadLocalBranches();
			GLib.debug("head rev = %s", this.head.get_name());
			var head_oid =  this.repo.revparse(this.head.get_name() ).get_id()  ;
			//var master_oid =  this.repo.revparse("refs/heads/master" ).get_id()  ;
			var master_oid =  this.repo.revparse("HEAD" ).get_id()  ;

			var master_commit  = this.repo.lookup_commit(master_oid);;
			var head_commit = this.repo.lookup_commit(head_oid);
			 
		
			var anc_oid = this.repo.merge_base(master_commit.get_id(), head_commit.get_id());
			
			var anc_commit = this.repo.lookup_commit(anc_oid);
			var anc_tree = anc_commit.get_tree();
			
			var mo = new Ggit.MergeOptions();
			var co = new Ggit.CheckoutOptions();
			var the_ref = this.repo.lookup_reference_dwim("refs/heads/master");

		    var ac = new Ggit.AnnotatedCommit.from_ref(this.repo, the_ref);
			
			var commits =   new Ggit.AnnotatedCommit[] { ac };
			
			this.repo.merge(commits, mo, co);
			
			var cfg = this.repo.get_config().snapshot();
			
		    var sig = new Ggit.Signature.now(
					cfg.get_string("user.name"),
					cfg.get_string("user.email")
			);
			var new_head = this.repo.get_head();
			var oid = new_head.get_target();

			var ix = this.repo.get_index();
 
			ix.write();
			var treeoid = ix.write_tree();

			var new_tree = this.repo.lookup(treeoid,typeof (Ggit.Tree))  as   Ggit.Tree;
			
			var parent = new_head.lookup() as Ggit.Commit;
			Ggit.Commit[] parents =  new Ggit.Commit[] { parent };
			
			this.repo.create_commit("refs/heads/" + this.head.get_name(), sig, sig, null, "Test Merge", new_tree, parents);
	 
		}
		
		

		
		
		/*
		public bool doMergeClose(string commit_message)
		{
			this.loadLocalBranches(true);
			var oldbranch = this.head.get_name();
            // going to asume this is merge trees..
		           string [] cmd = { "merge",   "--squash",  oldbranch };
		           this.git( cmd );
		           cmd = { "commit",   "-a" , "-m",  commit_message };
		           this.git( cmd );
		           this.push();
		           this.loadBranches(); // updates lastrev..
               
	               var notification = new Notify.Notification(
                               "Merged branch %s to %s".printf(oldbranch, master),
                               "",
                                "dialog-information"
                               
                       );

                       notification.set_timeout(5);
                       notification.show();   
               
		
		}
		*/
		
		
		public bool is_auto_branch ()
		{
			if (this.name == "gitlog") {
				return false;
			}
			// check remote...
			if (this.is_managed()) {
				return true;
			}
			return false;
			
	 
		}
		
		public async void loadRemoteHeads(bool force = false)
		{
		    SourceFunc callback = loadRemoteHeads.callback;
			
			ThreadFunc<bool> run = () => {
				
				if (!force && this.remote_heads != null) {
					return true;;
				}
				var r = this.repo.lookup_remote("origin");
				r.connect(Ggit.Direction.FETCH, this.callbacks, null, null);
				yield;
				this.remote_heads = r.list();
				
				foreach(var br in this.remote_heads) {
					if (!br.get_name().has_prefix("refs/heads/")) {
						continue;
					}
					
					GLib.debug("Remote: name=%s  oid=%s local_oid=%s is_local=%s",
						br.get_name(),
						br.get_oid().to_string(),
						br.get_local_oid().to_string(),
						br.is_local() ? "Y" : "n"
						);
				}
				Idle.add((owned) callback);
				return true;;
			};
			new Thread<bool>("loadRemoteHeads-" , run);
			yield;
			

		}
		 
		
		Ggit.Branch? getBranch(string remote_name, string remote_branch_name)
		{
			 //GLib.debug("bn=%s",remote_branch_name);
			 if (remote_branch_name.has_prefix("refs/remotes/")) {
				 return null;
			 }

			 var target = remote_branch_name.replace("refs/heads/", remote_name+"/") .replace("refs/remotes/", "");
			if (target == "HEAD") {
				target = remote_name +"/master";
			}
			 
			foreach(var br in this.branches) {
			//	GLib.debug("test:%s=%s", br.get_upstream().get_shorthand() , target);
				if ( br.get_upstream().get_shorthand() == target) {
					return br;
				}
				
			}
			//GLib.debug("missing %s", remote_branch_name);			
			return null;
		
		}
		 
		
		public void fetchAll()
		{
			this.loadLocalBranches();
			this.loadRemoteHeads();
			
			// remotes probably will not work with http auth..
			//var ar = this.repo.list_remotes();
			//foreach(var n in ar) {
			var n = "origin"; 
			
				GLib.debug("got remote '%s'", n);
				var r = this.repo.lookup_remote(n);
				GLib.debug("connecting '%s'", r.get_url());
				 
				try {
					string[] h = { "a = 1" };
					r.connect(Ggit.Direction.FETCH, this.callbacks, null, null);
					
				} catch (Error e) {
					GLib.debug("Got Error Message: %s", e.message);
					return;
				}
				string[] far = {};

				foreach(var rh in this.remote_heads) {
					if (rh.get_name().has_prefix("refs/remotes/")) {
						   continue;
					 }
				
					var br = this.getBranch(n, rh.get_name());
				 
					/*GLib.debug("got heads: name=%s   rev=%s  localrev=%s",
						rh.get_name(), 
						rh.get_oid().to_string(),
						br == null ? "?": this.repo.revparse(br.get_name() ).get_id().to_string()
					);
					*/
					//var loc_oid = this.repo.revparse(br.get_name() ).get_id();
					
					var loc_oid = br.get_target();
					
					size_t ahead, behind;
					this.repo.get_ahead_behind(
						loc_oid,
						rh.get_oid(),
						out ahead,
						out behind
					);
					
					if (rh.get_oid().to_string() == this.repo.revparse(br.get_name() ).get_id().to_string()) {
						continue;
					}
					if (ahead > 0) {
						continue;
					}
					far += ("+refs/heads/" + br.get_name()) + ":refs/remotes/" + n + "/" + rh.get_name().replace("refs/heads/","");
				} 
				
				if (far.length < 1) {
					GLib.debug("no fetch required.. it's uptodate");
					r.disconnect();
					return;
				}
				
				GLib.debug("getting remote specs '%s', %d", n, far.length);
				
/*
				var far = r.get_fetch_specs();
				*/
				foreach(var rs in far) {
					GLib.debug("got remote spec: %s", rs);
					
				}

				var options = new Ggit.FetchOptions();
				options.set_remote_callbacks(this.callbacks);
				//yield Async.thread(() => {
	
					r.download(far, options);
				//});
				r.disconnect();
				
				//r.download(
			 
		
		}
		
		
		
		public void pushAll()
		{
			
			this.loadLocalBranches();
			this.loadRemoteHeads();
			// remotes probably will not work with http auth..
			//var ar = this.repo.list_remotes();
			var n = "origin";
			
				GLib.debug("got remote '%s'", n);
				var r = this.repo.lookup_remote(n);
				GLib.debug("connecting '%s'", r.get_url());
				 
				r.connect(Ggit.Direction.PUSH, this.callbacks, null, null);
				
				//GLib.debug("getting specs '%s'", n);
				/* 
				
				this.repo.add_remote_push(
					"origin",
					"+%s:%s".printf(head.get_shorthand(),head.get_name())
				);
 */
 
 				string[] far = {};
				var heads = r.list();
				foreach(var rh in heads) {
					if (rh.get_name().has_prefix("refs/remotes/")) {
						   continue;
					 }
				
					var br = this.getBranch(n, rh.get_name());
				 	/*
					GLib.debug("got heads: name=%s   rev=%s  localrev=%s",
						rh.get_name(), 
						rh.get_oid().to_string(),
						br == null ? "?": this.repo.revparse(br.get_name() ).get_id().to_string()
					);*/
					var loc_oid = this.repo.revparse(br.get_name() ).get_id();
					size_t ahead, behind;
					this.repo.get_ahead_behind(
						loc_oid,
						rh.get_oid(),
						out ahead,
						out behind
					);
					
					if (rh.get_oid().to_string() == this.repo.revparse(br.get_name() ).get_id().to_string()) {
						continue;
					}
					if (behind > 0) {
						continue;
					}
					far += ("+refs/heads/" + br.get_name()) + ":"+ rh.get_name();
				}  
				
				if (far.length < 1) {
					GLib.debug("no push required.. it's uptodate");
					r.disconnect();
					return;
				}
 
 				/*var head = this.repo.get_head();
				string[] far = {};
				far += "+%s:%s".printf(head.get_name(),head.get_name());
				*/
				foreach(var rs in far) {
					GLib.debug("got remote spec: %s", rs);
					
				}
			 		
				var popts = new Ggit.PushOptions();
				 popts.callbacks = this.callbacks;
				GLib.debug("Push?");
				r.upload(far,popts);
				GLib.debug("Push done?");
				r.disconnect();
				
				
				//r.download(
			 
		
		}
		
		 

	}
	
	private class Callbacks : Ggit.RemoteCallbacks
	{
		//private Remote d_remote;
		private Ggit.RemoteCallbacks? d_proxy = null;

		public delegate void TransferProgress(Ggit.TransferProgress stats);
		//private TransferProgress? d_transfer_progress;

		public Callbacks( Repo repo)  //, Ggit.RemoteCallbacks? proxy) //,Remote remote, owned TransferProgress? transfer_progress)
		{
			//d_remote = remote;
			//d_proxy = proxy;
			//d_transfer_progress = (owned)transfer_progress;
		}

		protected override void progress(string message)
		{
			GLib.debug("progress: %s", message);
			if (d_proxy != null)
			{
				d_proxy.progress(message);
			}
		}

		protected override void transfer_progress(Ggit.TransferProgress stats)
		{
			GLib.debug("transfer_progress");
			/*
			if (d_transfer_progress != null)
			{
				d_transfer_progress(stats);
			}

			if (d_proxy != null)
			{
				d_proxy.transfer_progress(stats);
			}
			*/
		}

		protected override void update_tips(string refname, Ggit.OId a, Ggit.OId b)
		{
			GLib.debug("update_tips");
			//d_remote.tip_updated(refname, a, b);

			if (d_proxy != null)
			{
				d_proxy.update_tips(refname, a, b);
			}
		}

		protected override void completion(Ggit.RemoteCompletionType type)
		{
			GLib.debug("completion");
			if (d_proxy != null)
			{
				d_proxy.completion(type);
			}
		}

		protected override Ggit.Cred? credentials(string url, string? username_from_url, Ggit.Credtype allowed_types) throws Error
		{
 
			GLib.debug("get credentials %s  UN=%s", url, username_from_url);
			var uri = new Soup.URI(url);

			if (uri != null) {
				var ret = this.netrc(uri.get_host());
				if (ret != null) {
					return ret;
				}
				
				//return new Ggit.CredPlaintext(username_from_url, "test");
			}
			return null;
			/*var provider = d_remote.credentials_provider;

			if (provider != null)
			{
				ret = provider.credentials(url, username_from_url, allowed_types);
			}

			if (ret == null && d_proxy != null)
			{
				ret = d_proxy.credentials(url, username_from_url, allowed_types);
			}
			
			return ret;
			*/
		}
		public  Ggit.Cred netrc(string domain) 
		{
			string str;
			GLib.FileUtils.get_contents(GLib.Environment.get_home_dir() + "/.netrc", out str);
			var lines = str.split("\n");
			for(var i=0; i< lines.length; i++) {
				// assumes one line per entry.. if not we are buggered...
				//GLib.debug("got %s" , lines[i]);
			
				var bits =  Regex.split_simple ("[ \t]+", lines[i].strip());
				if (bits.length < 6 || bits[0] != "machine" || bits[1] != domain) {
					continue;
				}
				GLib.debug("found password?");
				// we are gussing.... 
				return new Ggit.CredPlaintext(bits[3], bits[5]);

			}
			return null;


		
		
		}
		
	}
	
	

}