#ifndef PRINTERSTATEMANAGER_H
#define PRINTERSTATEMANAGER_H
#pragma once
#include <QObject>
#include <QVector>
#include "SysPara.h"

enum class PrinterState {
    IDLE,           // 空闲
    SELF_CHECK,     // 自检中
    READY,          // 就绪
    PRINTING,       // 打印中
    STOPPING,       // 停止中
    ERROR,          // 故障
    POWER_OFF,      // 关机中
    NORMAL          // 一种常规状态，表明机器运行中，true
};

enum class PrinterEvent {
    PowerOn,
    SelfCheckDone,
    SelfCheckFailed,
    StartPrint,
    StopPrint,
    StopComplete,
    ErrorOccurred,
    ErrorCleared,
    PowerOff,
    PowerOffDone
};

class PrinterStateManager : public QObject
{
    Q_OBJECT
public:
    static PrinterStateManager* instance();
    // 绑定 sysPara（用于守卫条件）
    void bindSysPara(SysPara* para) { m_sysPara = para; }


    // ============ 状态查询 ============
    PrinterState currentState() const { return m_currentState; }
    QString stateName() const;
    bool isState(PrinterState state) const { return m_currentState == state; }
    bool canStartPrint() const { return m_currentState == PrinterState::READY; }
    bool canStopPrint() const { return m_currentState == PrinterState::PRINTING; }

    // ============ 状态管理 ============
    // 初始化状态（只在开机时调用一次）
    void initFromSysPara();

    // 外部唯一接口：请求切换状态
    void requestTransition(PrinterEvent event);

signals:
    // 状态变化信号（外部监听执行具体业务）
    void sig_stateChanged(PrinterState newState, PrinterState oldState, QString reason);

private:
    PrinterStateManager();
    ~PrinterStateManager();

    SysPara* m_sysPara = nullptr;
    static PrinterStateManager* s_instance;

    PrinterState m_currentState = PrinterState::IDLE;
    PrinterState m_previousState = PrinterState::IDLE;

    // 状态转移表
    // 守卫条件函数类型
    using GuardFunc = std::function<bool()>;

    struct Transition {
        PrinterState fromState;
        PrinterEvent event;
        PrinterState toState;
        QString description;
        GuardFunc guard;
    };

    QVector<Transition> m_transitions;

    void initTransitions();
    Transition* findTransition(PrinterEvent event);

    // 内部状态切换（不对外暴露）
    void setState(PrinterState newState, const QString& reason = "");

    QString stateNameFromEnum(PrinterState state) const;

    // ============ 守卫条件函数 ============
    // 检查回收槽是否已打开
    bool guardReclaimTankOpen();

    // 检查墨线是否已打开
    bool guardInkSwintOpen();

    // 检查是否无故障
    bool guardNoError();

    // 检查是否无墨水警告
    bool guardNoInkWarn();

    // 检查是否无溶剂警告
    bool guardNoSolventWarn();

    // 检查自检是否已完成
    bool guardSelfCheckDone();

    // 检查是否满足所有打印条件
    bool guardCanStartPrint();

};
#endif // PRINTERSTATEMANAGER_H