/** Modified from original Node-Red source, for audio system visualization
 * vim: set ts=4:
 * Copyright 2013 IBM Corp.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 **/
RED.history = (function() {
	var undo_history = [];
	
	return {
		//TODO: this function is a placeholder until there is a 'save' event that can be listened to
		markAllDirty: function() {
			for (var i=0;i<undo_history.length;i++) {
				undo_history[i].dirty = true;
			}
		},
		depth: function() {
			return undo_history.length;
		},
		push: function(ev) {
			undo_history.push(ev);
		},
		pop: function() {
			var ev = undo_history.pop();
			var i;
			if (ev) {
				if (ev.t == 'add') {
					for (i=0;i<ev.nodes.length;i++) {
						RED.nodes.remove(ev.nodes[i]);
					}
					for (i=0;i<ev.links.length;i++) {
						RED.nodes.removeLink(ev.links[i]);
					}
					for (i=0;i<ev.workspaces.length;i++) {
						RED.nodes.removeWorkspace(ev.workspaces[i].id);
						RED.view.removeWorkspace(ev.workspaces[i]);
					}
				} else if (ev.t == "delete") {
					for (i=0;i<ev.workspaces.length;i++) {
						RED.nodes.addWorkspace(ev.workspaces[i]);
						RED.view.addWorkspace(ev.workspaces[i]);
					}
					for (i=0;i<ev.nodes.length;i++) {
						RED.nodes.add(ev.nodes[i]);
					}
					for (i=0;i<ev.links.length;i++) {
						RED.nodes.addLink(ev.links[i]);
					}
				} else if (ev.t == "move") {
					for (i=0;i<ev.nodes.length;i++) {
						var n = ev.nodes[i];
						n.n.x = n.ox;
						n.n.y = n.oy;
						n.n.dirty = true;
					}
				} else if (ev.t == "edit") {
					for (i in ev.changes) {
						if (ev.changes.hasOwnProperty(i)) {
							ev.node[i] = ev.changes[i];
						}
					}
					RED.editor.updateNodeProperties(ev.node);
					for (i=0;i<ev.links.length;i++) {
						RED.nodes.addLink(ev.links[i]);
					}
					RED.editor.validateNode(ev.node);
					ev.node.dirty = true;
					ev.node.changed = ev.changed;
				}
				RED.view.dirty(ev.dirty);
				RED.view.redraw();
			}
		}
	}

})();


RED.validators = {
	number: function(){return function(v) { return v!=='' && !isNaN(v);}},
	regex: function(re){return function(v) { return re.test(v);}}
};