diff --git a/app/app.class.js b/app/app.class.js
new file mode 100644
index 0000000..83b7040
--- /dev/null
+++ b/app/app.class.js
@@ -0,0 +1,136 @@
+'use strict'
+
+// Depedencies
+let chokidar         = require( 'chokidar' ),
+	path             = require( 'path' ),
+	colors           = require( 'colors' ),
+	ip               = require( 'ip' ),
+	socket_io_client = require( 'socket.io-client' )
+
+/**
+ * App class
+ */
+class App
+{
+	/**
+	 * Constructor
+	 */
+	constructor( options )
+	{
+		this.set_options( options )
+		this.set_args()
+		this.set_watcher()
+		this.set_socket()
+	}
+
+	/**
+	 * Set options
+	 */
+	set_options( options )
+	{
+		// No option
+		if( typeof options !== 'object' )
+			options = {}
+
+		// Defaults
+		if( typeof options.domain === 'undefined' )
+			options.domain = ip.address()
+
+		if( typeof options.port === 'undefined' )
+			options.port = 3000
+
+		// Save
+		this.options = options
+	}
+
+	/**
+	 * Set args
+	 * Test missing arg
+	 */
+	set_args()
+	{
+		// Set up
+		this.arguments = process.argv.slice( 2 )
+
+		// Missing project slug
+		if( this.arguments.length === 0 )
+		{
+			// Stop process
+			console.log( 'Missing arguments: first argument should be the projet slug'.red )
+			process.exit()
+		}
+
+		// Wrong project slug
+		if( !this.arguments[ 0 ].match( /^[a-z_-][a-z0-9_-]+$/ ) )
+		{
+			// Stop process
+			console.log( 'Wrong arguments: projet slug'.red )
+			process.exit()
+		}
+	}
+
+	/**
+	 * Set socket
+	 * Connect to site
+	 */
+	set_socket()
+	{
+		// Set up
+		this.socket = socket_io_client( `http://${this.options.domain}:${this.options.port}` )
+
+		// Connect event
+		this.socket.on( 'connect', () =>
+		{
+			console.log( 'connected' )
+			this.socket.emit( 'start_project', { slug : this.arguments[ 0 ] } )
+		} )
+	}
+
+	/**
+	 * Set watcher
+	 * Listen to modifications on file and folders
+	 */
+	set_watcher()
+	{
+		// Set up
+		this.watcher = chokidar.watch(
+				process.cwd(),
+				{
+					ignored : /[\/\\]\./,
+					ignoreInitial : true
+				}
+			)
+
+		// Add event
+		this.watcher.on( 'add', ( path ) =>
+		{
+			console.log( 'add:'.green.bold, path )
+		} )
+
+		// Change event
+		this.watcher.on( 'change', ( path ) =>
+		{
+			console.log( 'change:'.green.bold, path )
+		} )
+
+		// Unlink event
+		this.watcher.on( 'unlink', ( path ) =>
+		{
+			console.log( 'unlink:'.green.bold, path )
+		} )
+
+		// AddDir event
+		this.watcher.on( 'addDir', ( path ) =>
+		{
+			console.log( 'addDir:'.green.bold, path )
+		} )
+
+		// UnlinkDir event
+		this.watcher.on( 'unlinkDir', ( path ) =>
+		{
+			console.log( 'unlinkDir:'.green.bold, path )
+		} )
+	}
+}
+
+module.exports = App
\ No newline at end of file
diff --git a/app/index.js b/app/index.js
index 897bd65..3f06c73 100644
--- a/app/index.js
+++ b/app/index.js
@@ -1,41 +1,4 @@
-// Depedencies
-var chokidar = require( 'chokidar' ),
-	path     = require( 'path' ),
-	colors   = require( 'colors' );
+'use strict'
 
-// Working directory
-var cwd = process.cwd();
-
-// Watcher
-var watcher = chokidar.watch(
-		cwd,
-		{
-			ignored : /[\/\\]\./,
-			ignoreInitial : true
-		}
-	);
-
-watcher.on( 'add', ( path ) =>
-{
-	console.log( 'add:'.green.bold, path );
-} );
-
-watcher.on( 'change', ( path ) =>
-{
-	console.log( 'change:'.green.bold, path );
-} );
-
-watcher.on( 'unlink', ( path ) =>
-{
-	console.log( 'unlink:'.green.bold, path );
-} );
-
-watcher.on( 'addDir', ( path ) =>
-{
-	console.log( 'addDir:'.green.bold, path );
-} );
-
-watcher.on( 'unlinkDir', ( path ) =>
-{
-	console.log( 'unlinkDir:'.green.bold, path );
-} );
\ No newline at end of file
+let App = require( './app.class.js' ),
+	app = new App()
\ No newline at end of file
diff --git a/app/package.json b/app/package.json
index ac80b83..e6b147f 100644
--- a/app/package.json
+++ b/app/package.json
@@ -18,6 +18,8 @@
   "homepage": "https://github.com/brunosimon/code-spectactor",
   "dependencies": {
     "chokidar": "^1.5.1",
-    "colors": "^1.1.2"
+    "colors": "^1.1.2",
+    "ip": "^1.1.3",
+    "socket.io-client": "^1.4.6"
   }
 }
diff --git a/site/app.class.js b/site/app.class.js
new file mode 100644
index 0000000..acca289
--- /dev/null
+++ b/site/app.class.js
@@ -0,0 +1,121 @@
+'use strict'
+
+// Dependencies
+let express   = require( 'express' ),
+	helmet    = require( 'helmet' ),
+	http      = require( 'http' ),
+	socket_io = require( 'socket.io' ),
+	colors    = require( 'colors' ),
+	path      = require( 'path' ),
+	ip        = require( 'ip' ),
+	util = require( 'util' )
+
+/**
+ * App class
+ */
+class App
+{
+	/**
+	 * Constructor
+	 */
+	constructor( _options )
+	{
+		this.set_options( _options )
+		this.set_models()
+		this.set_express()
+		this.set_server()
+		this.set_socket()
+	}
+
+	/**
+	 * Set models
+	 */
+	set_models()
+	{
+		let Projects = require( './models/projects.class.js' )
+		this.projects = new Projects()
+
+		var project = this.projects.create_project( 'test' )
+
+		project.update_file( 'toto/tata/tete/tutu.txt', 'content 1' )
+		project.update_file( 'toto/tata/lorem.txt', 'content 2' )
+		project.update_file( 'toto/tata/ipsum.txt', 'content 3' )
+
+		project.delete_file( 'toto/tata/tete/tutu.txt' )
+		project.delete_file( 'toto/tata/lorem.txt' )
+		project.delete_file( 'toto/tata/ipsum.txt' )
+
+		console.log( util.inspect( project.folders, { depth: null, colors: true } ) )
+	}
+
+	/**
+	 * Set options
+	 */
+	set_options( _options )
+	{
+		// No option
+		if( typeof _options !== 'object' )
+			_options = {}
+
+		if( typeof _options.port === 'undefined' )
+			_options.port = 3000
+
+		// Save
+		this.options = _options
+	}
+
+	/**
+	 * Set express
+	 * Start express and set controllers
+	 */
+	set_express()
+	{
+		// Set up
+		this.express = express()
+
+		// Controllers
+		this.express.use( '/codes', require( './controllers/index.js' ) )
+	}
+
+	/**
+	 * Set server
+	 */
+	set_server()
+	{
+		// Set up
+		this.server = http.createServer( this.express )
+
+		// Start
+		this.server.listen( this.options.port, () =>
+		{
+		    // URL
+		    let url = 'http://' + ip.address() + ':' + this.options.port
+
+		    console.log( colors.green( '---------------------------' ) )
+		    console.log( 'server'.green.bold + ' - ' + 'started'.cyan )
+		    console.log( 'server'.green.bold + ' - ' + url.cyan )
+		} )
+	}
+
+	/**
+	 * Set socket
+	 */
+	set_socket()
+	{
+		// Set up
+		this.io = socket_io.listen( this.server )
+
+		// Connection event
+		this.io.on( 'connection', ( socket ) =>
+		{
+		    console.log( 'socket'.green.bold + ' - ' + 'connect'.cyan + ' - ' + socket.id.cyan )
+
+		    socket.on( 'start_project', ( data ) =>
+		    {
+
+		    } )
+		} )
+	}
+}
+
+module.exports = App
\ No newline at end of file
diff --git a/site/index.js b/site/index.js
index 782b194..3f06c73 100644
--- a/site/index.js
+++ b/site/index.js
@@ -1,31 +1,4 @@
-// Dependencies
-var express   = require( 'express' ),
-	helmet    = require( 'helmet' ),
-	http      = require( 'http' ),
-	socket_io = require( 'socket.io' ),
-	colors    = require( 'colors' ),
-	path      = require( 'path' ),
-	ip        = require( 'ip' );
+'use strict'
 
-// Express
-var express = express();
-
-express.use( '/codes', require( './controllers/index.js' ) )
-
-// Server
-var server = http.createServer( express ),
-	server_port = 3000;
-
-// Server
-server.listen( server_port, function()
-{
-    // URL
-    var url = 'http://' + ip.address() + ':' + server_port;
-
-    console.log( colors.green( '---------------------------' ) );
-    console.log( 'server'.green.bold + ' - ' + 'started'.cyan );
-    console.log( 'server'.green.bold + ' - ' + url.cyan );
-} );
-
-// Socket
-var io = socket_io.listen( server );
+let App = require( './app.class.js' ),
+	app = new App()
\ No newline at end of file
diff --git a/site/models/file.class.js b/site/models/file.class.js
new file mode 100644
index 0000000..08345f8
--- /dev/null
+++ b/site/models/file.class.js
@@ -0,0 +1,34 @@
+'use strict'
+
+class File
+{
+	constructor( _name, _content )
+	{
+		// Set up
+		this.name     = _name
+		this.versions = []
+
+		// Create first version
+		if( typeof _content !== 'undefined' )
+			this.create_version( _content )
+	}
+
+	create_version( content )
+	{
+		// Create version
+		let version = {}
+
+		// Set up
+		version.date    = new Date()
+		version.content = content
+
+		this.versions.push( version )
+	}
+
+	destructor()
+	{
+		console.log( 'destruct' )
+	}
+}
+
+module.exports = File
\ No newline at end of file
diff --git a/site/models/project.class.js b/site/models/project.class.js
new file mode 100644
index 0000000..4918c97
--- /dev/null
+++ b/site/models/project.class.js
@@ -0,0 +1,135 @@
+'use strict'
+
+// Dependencies
+let path = require( 'path' ),
+	util = require( 'util' ),
+	File = require( './file.class.js' )
+
+class Project
+{
+	constructor()
+	{
+		this.folders = {
+			root:
+			{
+				name   : 'root',
+				files  : {},
+				folders: {}
+			}
+		}
+	}
+
+	update_file( _path, _content )
+	{
+		// Set up
+		let normalize_path = path.normalize( _path ),
+			parsed_path    = path.parse( normalize_path )
+
+		// Retrieve folder
+		let folder = this.get_folder( parsed_path.dir )
+
+		// Folder doesn't exist
+		if( !folder )
+		{
+			// Create folders
+			folder = this.create_folder( parsed_path.dir )
+		}
+
+		// Retrieve file
+		let file = folder.files[ parsed_path.base ]
+
+		// File doesn't exist
+		if( !file )
+		{
+			file = new File( parsed_path.base )
+			folder.files[ file.name ] = file
+		}
+
+		file.create_version( _content )
+	}
+
+	get_folder( _path )
+	{
+		let path_parts = _path.split( path.sep ),
+			folder     = this.folders.root
+
+		for( let _path_part of path_parts )
+		{
+			folder = folder.folders[ _path_part ]
+
+			// Folder not found
+			if(typeof folder === 'undefined')
+				return false
+		}
+
+		return folder
+	}
+
+	create_folder( _path )
+	{
+		// Set up
+		let path_parts = _path.split( path.sep ),
+			folder     = this.folders.root
+
+		for( let _path_part of path_parts )
+		{
+			// Temporary folder
+			let __folder = folder.folders[ _path_part ]
+
+			// Folder doesn't exist
+			if( typeof __folder === 'undefined' )
+			{
+				__folder         = {}
+				__folder.name    = _path_part
+				__folder.files   = {}
+				__folder.folders = {}
+
+				folder.folders[ _path_part ] = __folder
+			}
+
+			folder = __folder
+		}
+
+		return folder;
+	}
+
+	// clean_folders()
+	// {
+	// 	// Empty all
+	// 	this.folders.all = {}
+
+	// 	let clean_folder = function( folder )
+	// 		{
+	// 			for( let _folder_name in folder.folders )
+	// 			{
+	// 				clean_folder( folder.folders[ _folder_name ] )
+	// 			}
+	// 		}
+
+	// 	clean_folder( this.folders.root )
+	// }
+
+	delete_file( _path )
+	{
+		// Set up
+		let normalize_path = path.normalize( _path ),
+			parsed_path    = path.parse( normalize_path )
+
+		// Retrieve folder
+		let folder = this.get_folder( parsed_path.dir )
+
+		// Folder found
+		if( folder )
+		{
+			let file = folder.files[ parsed_path.base ]
+
+			// File found
+			if( file )
+			{
+				delete folder.files[ parsed_path.base ]
+			}
+		}
+	}
+}
+
+module.exports = Project
\ No newline at end of file
diff --git a/site/models/projects.class.js b/site/models/projects.class.js
new file mode 100644
index 0000000..9301daf
--- /dev/null
+++ b/site/models/projects.class.js
@@ -0,0 +1,38 @@
+'use strict'
+
+let Project = require( './project.class.js' )
+
+class Projects
+{
+	constructor()
+	{
+		this.all = {}
+	}
+
+	create_project( _slug )
+	{
+		// Create project
+		let project = new Project( _slug )
+
+		// Save
+		this.all[ project.slug ] = project
+
+		// Return
+		return project
+	}
+
+	get_project_by_slug( _slug )
+	{
+		// Find project
+		let project = this.all[ _slug ]
+
+		// Found
+		if( project )
+			return project
+
+		// Not found
+		return false
+	}
+}
+
+module.exports = Projects
\ No newline at end of file
diff --git a/test-folder/udshfiuhsdf/iuisduhfsdf b/test-folder/udshfiuhsdf/iuisduhfsdf
index e69de29..c1f5866 100644
--- a/test-folder/udshfiuhsdf/iuisduhfsdf
+++ b/test-folder/udshfiuhsdf/iuisduhfsdf
@@ -0,0 +1 @@
+sdfsdfdsf
\ No newline at end of file