package com.tuoheng.status.statemachine.manager;

import com.tuoheng.status.statemachine.events.Event;
import com.tuoheng.status.statemachine.status.Status;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.statemachine.StateMachine;
import org.springframework.statemachine.config.StateMachineFactory;
import org.springframework.statemachine.state.State;
import org.springframework.stereotype.Component;

import java.util.Map;
import java.util.concurrent.ConcurrentHashMap;
import java.util.logging.Logger;

/**
 * 状态机管理器
 * 用于管理多个状态机实例，通过ID获取和查询状态机
 */
@Component
public class StateMachineManager {

    private static final Logger logger = Logger.getLogger(StateMachineManager.class.getName());

    @Autowired
    private StateMachineFactory<Status, Event> stateMachineFactory;

    // 存储状态机实例的Map，key为状态机ID
    private final Map<String, StateMachine<Status, Event>> stateMachineMap = new ConcurrentHashMap<>();

    /**
     * 创建或获取状态机实例
     * 如果ID对应的状态机不存在，则创建新实例；如果存在，则返回现有实例
     *
     * @param machineId 状态机ID
     * @return 状态机实例
     */
    public StateMachine<Status, Event> getOrCreateStateMachine(String machineId) {
        return stateMachineMap.computeIfAbsent(machineId, id -> {
            logger.info("创建新状态机实例，ID: " + id);
            StateMachine<Status, Event> stateMachine = stateMachineFactory.getStateMachine(id);
            // 将machineId存储到扩展状态中
            stateMachine.getExtendedState().getVariables().put("machineId", id);
            // 启动状态机
            stateMachine.start();
            return stateMachine;
        });
    }

    /**
     * 获取状态机实例（如果不存在则返回null）
     *
     * @param machineId 状态机ID
     * @return 状态机实例，如果不存在则返回null
     */
    public StateMachine<Status, Event> getStateMachine(String machineId) {
        return stateMachineMap.get(machineId);
    }

    /**
     * 创建新的状态机实例（如果已存在则先停止并移除旧的）
     *
     * @param machineId 状态机ID
     * @return 新创建的状态机实例
     */
    public StateMachine<Status, Event> createStateMachine(String machineId) {
        // 如果已存在，先停止并移除
        StateMachine<Status, Event> existing = stateMachineMap.remove(machineId);
        if (existing != null) {
            logger.info("停止并移除已存在的状态机，ID: " + machineId);
            try {
                existing.stop();
            } catch (Exception e) {
                logger.warning("停止状态机时发生错误: " + e.getMessage());
            }
        }

        // 创建新实例
        logger.info("创建新状态机实例，ID: " + machineId);
        StateMachine<Status, Event> stateMachine = stateMachineFactory.getStateMachine(machineId);
        stateMachine.getExtendedState().getVariables().put("machineId", machineId);
        stateMachine.start();
        stateMachineMap.put(machineId, stateMachine);
        return stateMachine;
    }

    /**
     * 获取状态机的当前状态
     *
     * @param machineId 状态机ID
     * @return 当前状态，如果状态机不存在则返回null
     */
    public Status getCurrentStatus(String machineId) {
        StateMachine<Status, Event> stateMachine = stateMachineMap.get(machineId);
        if (stateMachine == null) {
            logger.warning("状态机不存在，ID: " + machineId);
            return null;
        }
        
        State<Status, Event> state = stateMachine.getState();
        if (state == null) {
            return null;
        }
        
        return state.getId();
    }

    /**
     * 获取状态机的详细信息（包括当前状态和扩展状态）
     *
     * @param machineId 状态机ID
     * @return 状态机信息，如果状态机不存在则返回null
     */
    public StateMachineInfo getStateMachineInfo(String machineId) {
        StateMachine<Status, Event> stateMachine = stateMachineMap.get(machineId);
        if (stateMachine == null) {
            return null;
        }

        StateMachineInfo info = new StateMachineInfo();
        info.setMachineId(machineId);
        
        State<Status, Event> state = stateMachine.getState();
        if (state != null) {
            info.setCurrentStatus(state.getId());
            info.setIsSubState(state.isSubmachineState());
        }
        
        info.setExtendedState(stateMachine.getExtendedState().getVariables());
        // 通过检查状态机是否有状态来判断是否在运行
        // Spring StateMachine 3.2.0 没有 isRunning() 方法，使用状态判断
        info.setIsRunning(state != null);
        
        return info;
    }

    /**
     * 移除状态机实例
     *
     * @param machineId 状态机ID
     * @return 是否成功移除
     */
    public boolean removeStateMachine(String machineId) {
        StateMachine<Status, Event> stateMachine = stateMachineMap.remove(machineId);
        if (stateMachine != null) {
            logger.info("移除状态机实例，ID: " + machineId);
            try {
                stateMachine.stop();
                return true;
            } catch (Exception e) {
                logger.warning("停止状态机时发生错误: " + e.getMessage());
                return false;
            }
        }
        return false;
    }

    /**
     * 检查状态机是否存在
     *
     * @param machineId 状态机ID
     * @return 是否存在
     */
    public boolean exists(String machineId) {
        return stateMachineMap.containsKey(machineId);
    }

    /**
     * 获取所有状态机的ID列表
     *
     * @return 状态机ID集合
     */
    public java.util.Set<String> getAllMachineIds() {
        return stateMachineMap.keySet();
    }

    /**
     * 获取当前管理的状态机数量
     *
     * @return 状态机数量
     */
    public int getStateMachineCount() {
        return stateMachineMap.size();
    }

    /**
     * 清空所有状态机实例
     */
    public void clearAll() {
        logger.info("清空所有状态机实例，数量: " + stateMachineMap.size());
        for (Map.Entry<String, StateMachine<Status, Event>> entry : stateMachineMap.entrySet()) {
            try {
                entry.getValue().stop();
            } catch (Exception e) {
                logger.warning("停止状态机时发生错误，ID: " + entry.getKey() + ", 错误: " + e.getMessage());
            }
        }
        stateMachineMap.clear();
    }

    /**
     * 状态机信息类
     */
    public static class StateMachineInfo {
        private String machineId;
        private Status currentStatus;
        private boolean isSubState;
        private boolean isRunning;
        private Map<Object, Object> extendedState;

        // Getters and Setters
        public String getMachineId() {
            return machineId;
        }

        public void setMachineId(String machineId) {
            this.machineId = machineId;
        }

        public Status getCurrentStatus() {
            return currentStatus;
        }

        public void setCurrentStatus(Status currentStatus) {
            this.currentStatus = currentStatus;
        }

        public boolean isSubState() {
            return isSubState;
        }

        public void setIsSubState(boolean subState) {
            isSubState = subState;
        }

        public boolean isRunning() {
            return isRunning;
        }

        public void setIsRunning(boolean running) {
            isRunning = running;
        }

        public Map<Object, Object> getExtendedState() {
            return extendedState;
        }

        public void setExtendedState(Map<Object, Object> extendedState) {
            this.extendedState = extendedState;
        }

        @Override
        public String toString() {
            return "StateMachineInfo{" +
                    "machineId='" + machineId + '\'' +
                    ", currentStatus=" + currentStatus +
                    ", isSubState=" + isSubState +
                    ", isRunning=" + isRunning +
                    ", extendedState=" + extendedState +
                    '}';
        }
    }
}