angular.module('MyApp')

.directive('edit', function ($parse) {
	var directive = {}

	directive.scope = true
	directive.link = function (scope, element, attrs) {
		var callback = function (item) {}
		var model = $parse(attrs.edit)
		var editor = scope.editor = {}

		if (attrs.callback != null)
			callback = $parse(attrs.callback)(scope)

		editor.save = function () {
			var data = model(scope)
			callback(scope.item)
			if (scope.item._key !== editor.key)
				delete data[editor.key];
			data[scope.item._key] = scope.item
			delete scope.item._key
			editor.revert()
		}

		editor.revert = function () {
			editor.key = null
			scope.item = {}
		}

		scope.$watch('editor.key', function (value) {
			if (value == null) {
				editor.revert()
			} else {
				var data = model(scope)
				scope.item = angular.copy(data[value] || {})
				scope.item._key = value
			}
		})

		editor.revert()
	}

	return directive
})