var channel = function(){
	this.name = null;
	this.TS = null;
	this.topic = { 'setter': null, 'TS': null, 'text': null };
	this.modes = {}; // indexed by mode name
	this.statusModes = {}; // indexed by UID
	this.listModes = {}; // indexed by mode name
	this.users = [];
	this.metadata = {};
	
	this.events = {};
	
	this.setEvents = function(events){
		this.events = events;
	};

	this.setTS = function(TS){
		this.TS = TS;
	};
	
	this.changeModes = function(modes){
		for(var mode in modes){
			if(mode == 'status'){
				for(var i=0; i<modes[mode].length; i++){
					var statusMode = modes[mode][i];
					this.statusModes[statusMode.user.uid][statusMode.name] = statusMode.status;
					console.log((statusMode.status?'Setting':'Unsetting')+' '+statusMode.name+' for '+statusMode.user.name+' on '+this.name);
					this.events.doEvent('channelStatusMode', this, statusMode);
				}
			} else if(mode == 'list'){
				for(var i=0; i<modes[mode].length; i++){
					var listMode = modes[mode][i];
					if(!(listMode.name in this.listModes)){
						this.listModes[listMode.name] = [];
					}
					
					if(listMode.status){ // add
						if(this.listModes[listMode.name].indexOf(listMode.value) < 0){
							this.listModes[listMode.name].push(listMode.value);
						}
					} else { // remove
						for(var j=this.listModes[listMode.name].length-1; j >= 0; j--){
							if(this.listModes[listMode.name][j] == listMode.value){
								this.listModes[listMode.name].splice(j, 1);
							}
						}
					}
					this.events.doEvent('channelListMode', this, listMode);
				}
			} else {
				this.modes[mode] = modes[mode];
				this.events.doEvent('channelModes', this);
			}
		}
	};
	
	this.joinUser = function(user){
		if(this.users.indexOf(user) >= 0) return;
		this.users.push(user);
		this.statusModes[user.uid] = {};
		user.joinChannel(this);
		this.events.doEvent('channelJoin', this, user);
	};
	
	this.removeUser = function(user){
		if(user.uid in this.statusModes){
			delete this.statusModes[user.uid]; // remove status modes for this user
		}
		for(var i=0; i<this.users.length; i++){
			if(this.users[i] == user){
				user.leaveChannel(this);
				this.users.splice(i, 1);
				this.events.doEvent('channelLeave', this, user);
				break;
			}
		}
	};
	
	this.setMetadata = function(name, visibility, value){
		if(value){
			this.metadata[name] = { 'visibility': visibility, 'value': value };
		} else {
			if(name in this.metadata){
				delete this.metadata[name];
			}
		}
		this.events.doEvent('channelMetadata', this, name);
	};
	
	this.setTopic = function(topic){
		this.topic = topic;
		this.events.doEvent('channelTopic', this);
	};
}

module.exports = channel;