package foundation.state;

import java.util.HashMap;
import java.util.List;
import java.util.Map;

import foundation.dao.preload.Bucket;
import foundation.util.Util;

public class MachineBucket extends Bucket<StateMachine> {

	private static Object locker = new Object();
	private static MachineBucket instance;
	private Map<String, StateMachine> dataMachineMap;
	
	
	public MachineBucket() {
		dataMachineMap = new HashMap<String, StateMachine>();
	}
	
	public static MachineBucket getInstance() {
		if (instance == null) {
			synchronized (locker) {
				if (instance == null) {
					instance = new MachineBucket();
				}
			}
		}
		
		return instance;
	}
	
	public static MachineBucket newInstance() {
		return new MachineBucket();
	}
	
	@Override
	public void activate() {
		instance = this;
	}

	public void loadtarget(String dataName, StateMachine machine) {
		dataMachineMap.put(dataName, machine);
	}

	public static StateMachine getMachineByDataName(String dataName) {
		StateMachine result = instance.dataMachineMap.get(dataName);
		
		if (result == null) {
			logger.error("数据对象{}对应的状态机没有找到", dataName);
		}
		
		return result;
	}
	
	public static StateMachine getMachineById(String machineId) {
		StateMachine result = instance.get(machineId);
		
		if (result == null) {
			logger.error("状态机{}没有找到", machineId);
		}
		
		return result;
	}
	
	public static boolean isInFreedom(String dataName, String stateCode) {
		if (Util.isEmpty(stateCode)) {
			return true;
		}
		
		StateMachine machine = getMachineByDataName(dataName);
		
		if (machine == null) {
			return false;
		}
		
		State state = machine.getState(stateCode);
		
		if (state == null) {
			return false;
		}
		
		return state.isInFreedom();
	}
	
	public static StateField getStateField(String dataName) {
		StateMachine machine = getMachineByDataName(dataName);
		
		if (machine == null) {
			return null;
		}
		
		return machine.getStateField();
	}
}