var Command = function(terminal) {

	this.terminal = terminal;

	this.commandList = [];

	this.parser = new Parser();

	var self = this;

	this.run = function(line) {
		if (self.inputEcho) {
			self.terminal.ui.print(terminal.ui.prompt.textContent);
			self.terminal.ui.println(line);
		}
		if (line.length > 0) {
			self.parser.setLine(line);
			self.parser.parse();
			var args = self.parser.tokens;
			var f = self['command_' + args[0]];
			if (f != null) {
				try {
					f(args);
				} catch (e) {
					self.printErrorLine(e);
				}
			} else {
				if (self.terminal.ws.webSocket.readyState == WebSocket.OPEN) {
					var id = self.terminal.nextID();
					self.terminal.callbacks[id.toString()] = self.terminal.printResult;
					var command = args.shift();
					self.terminal.ws.webSocket.send(JSON.stringify(
						{ id: id, opcode: 'Command', command: command, args: args }
					));
				} else {
					self.println('Not connected');
				}
			}
		}
		if (self.inputCallback != null) {
			self.inputCallback();
		}
	};

	this.helpCallback = function(packet, args) {
		if (packet.opcode == 'StringList') {
			self.println('- Remote Command List -');
			for (var i = 0; i < packet.list.length; i++) {
				self.print(' ' + packet.list[i]);
			}
			self.println('');
		} else {
			self.printErrorLine(packet.opcode);
		}
	};

	this.command_help = function(args) {
		self.println('- Short Help -');
		self.println('Press TAB to use input completion.');
		self.println('To show input history press UP or DOWN.');
		self.println('');
		self.println('- Local Command List -');
		for (var i = 0; i < self.commandList.length; i++) {
			self.print(' ' + self.commandList[i]);
		}
		self.println('');
		self.println('');

		self.terminal.api.commandList(self.helpCallback, null);
	};

	this.command_clear = function(args) {
		self.terminal.ui.clear();
	};

	this.whoCallback = function(packet, args) {
		if (packet.opcode == 'AccountList') {
			for (var i = 0; i < packet.list.length; i++) {
				self.println(packet.list[i].name);
			}
		} else {
			self.printErrorLine(packet.opcode);
		}
	};

	this.command_who = function(args) {
		self.terminal.api.who(self.whoCallback, null);
	};

	this.loginCallback = function(account, password) {
		self.terminal.api.login(self.terminal.printResult, null, account, password);
		self.terminal.loop();
	};

	this.command_login = function(args) {
		self.terminal.ui.login(self.loginCallback);
	};

	this.command_args = function(args) {
		for (var i = 0; i < args.length; i++) {
			self.println(i + ': ' + args[i]);
		}
	};

	this.command_echo = function(args) {
		args.shift();
		self.println(args.join(' '));
	};

	this.command_date = function(args) {
		self.println(new Date());
	};

	this.command_pwd = function(args) {
		self.println(self.terminal.session.currentDirectory);
	};

	this.command_cd = function(args) {
		if (args.length < 2) {
			self.terminal.session.changeDirectory(self.terminal.session.homeDirectory);
		} else {
			self.terminal.session.changeDirectory(args[1]);
		}
	};

	this.lsCallback = function(packet, args) {
		if (packet.opcode == 'FileList') {
			for (var i = 0; i < packet.list.length; i++) {
				if (packet.list[i].type == 'DIRECTORY') {
					self.terminal.ui.println(packet.list[i].name, '#4080ff');
				} else if (packet.list[i].type == 'FILE') {
					self.terminal.ui.println(packet.list[i].name);
				} else if (packet.list[i].type == 'OTHER') {
				} else {
					self.terminal.ui.println(packet.list[i].name, '#ff4040');
				}
			}
		} else if (packet.opcode == 'FileException') {
			self.printErrorLine(packet.type);
		}
	};

	this.command_ls = function(args) {
		if (args.length < 2) {
			self.terminal.fileAPI.list(self.lsCallback, null, self.terminal.session.currentDirectory);
		} else {
			self.terminal.fileAPI.list(self.lsCallback, null, self.terminal.session.toAbsolutePath(args[1]));
		}
	};

	this.catCallback = function(packet, args) {
		if (packet.opcode == 'File') {
			self.print(Unicode.fromUTF8(Base64.decode(packet.content)));
		} else if (packet.opcode == 'FileException') {
			self.printErrorLine(packet.type);
		} else {
			self.printErrorLine('Unknown opcode: ' + packet.opcode);
		}
	};

	this.command_cat = function(args) {
		if (args.length < 2) {
			self.printErrorLine(args[0] + ': missing operand');
			return;
		}
		self.terminal.fileAPI.load(self.catCallback, null, self.terminal.session.toAbsolutePath(args[1]));
	};

	this.rmCallback = function(packet, args) {
		if (packet.opcode == 'FileException') {
			self.printErrorLine(packet.type);
		}
	};

	this.command_rm = function(args) {
		if (args.length < 2) {
			self.printErrorLine(args[0] + ': missing operand');
			return;
		}
		self.terminal.fileAPI.delete(self.rmCallback, null, self.terminal.session.toAbsolutePath(args[1]));
	};

	this.mkdirCallback = function(packet, args) {
		if (packet.opcode == 'FileException') {
			self.printErrorLine(packet.type);
		}
	};

	this.command_mkdir = function(args) {
		if (args.length < 2) {
			self.printErrorLine(args[0] + ': missing operand');
			return;
		}
		self.terminal.fileAPI.createDirectory(self.mkdirCallback, null, self.terminal.session.toAbsolutePath(args[1]));
	};

	this.viCallback = function(packet, args) {
		var content = '';
		if (packet.opcode == 'File') {
			content = Unicode.fromUTF8(Base64.decode(packet.content));
		} else if (packet.opcode == 'FileException') {
			if (packet.type == 'IS_DIRECTORY') {
				self.printErrorLine(packet.type);
				return;
			}
		}

		var path = self.terminal.session.toAbsolutePath(args[0]);
		var editor = new TextEditor(self.terminal);
		editor.name.textContent = path;
		editor.area.value = content;
		self.terminal.ui.append(editor.node);
	};

	this.command_vi = function(args) {
		if (args.length < 2) {
			self.printErrorLine(args[0] + ': missing operand');
			return;
		}
		var path = self.terminal.session.toAbsolutePath(args[1]);
		self.terminal.fileAPI.load(self.viCallback, [ path ], path);
	};

	this.command_upload = function(args) {
		var uploader = new Uploader(self.terminal);
		self.terminal.ui.append(uploader.node);
	};

	for (var v in this) {
		if (v.indexOf('command_') == 0) {
			this.commandList.push(v.substr('command_'.length));
		}
	}

};

Command.prototype.COLOR = '#40a060';
Command.prototype.ERROR_COLOR = '#e050b0';

Command.prototype.print = function(s) {
	this.terminal.ui.print(s, this.COLOR);
};

Command.prototype.println = function(s) {
	this.print(s + '\n');
};

Command.prototype.printError = function(s) {
	this.terminal.ui.print(s, this.ERROR_COLOR);
};

Command.prototype.printErrorLine = function(s) {
	this.printError(s + '\n');
};

Command.prototype.readLine = function(callback, echo) {
	this.inputCallback = callback;
	this.inputEcho = echo;
	this.terminal.ui.readLine(this.run, this.commandList);
};