#ifndef OLLIE9PCLIENT_H
#define OLLIE9PCLIENT_H

#include <QObject>
#include <QVariantList>
#include <QHash>
#include <QSet>
#if QT_VERSION_MAJOR >= 6
#include <QQmlEngine>
#endif

#include "streamfsm.h"
#include "ninepconnection.h"

// 9P-based client for ollie. Uses ollie-9p subprocess for transport.
// Streaming files (chat, statewait) use StreamFsm instances for lifecycle.
class Ollie9pClient : public QObject
{
    Q_OBJECT
#if QT_VERSION_MAJOR >= 6
    QML_ELEMENT
    QML_SINGLETON
#endif

    Q_PROPERTY(QVariantList sessions READ sessions NOTIFY sessionsChanged)
    Q_PROPERTY(QString activeSessionId READ activeSessionId WRITE setActiveSessionId NOTIFY activeSessionIdChanged)
    Q_PROPERTY(QString activeAgentId READ activeAgentId NOTIFY activeAgentIdChanged)
    Q_PROPERTY(QString activeState READ activeState NOTIFY activeStateChanged)
    Q_PROPERTY(bool rootBackendsLoaded READ rootBackendsLoaded NOTIFY rootBackendsLoadedChanged)
    Q_PROPERTY(QStringList availableBackends READ availableBackends NOTIFY availableBackendsChanged)
    Q_PROPERTY(bool rootAgentsLoaded READ rootAgentsLoaded NOTIFY rootAgentsLoadedChanged)
    Q_PROPERTY(QStringList availableAgents READ availableAgents NOTIFY availableAgentsChanged)
    Q_PROPERTY(bool rootModelsLoaded READ rootModelsLoaded NOTIFY rootModelsLoadedChanged)
    Q_PROPERTY(QString currentBackend READ currentBackend WRITE setCurrentBackend NOTIFY currentBackendChanged)
    Q_PROPERTY(bool daemonConnected READ daemonConnected NOTIFY daemonConnectedChanged)

public:
    explicit Ollie9pClient(QObject *parent = nullptr);
    ~Ollie9pClient();

    QVariantList sessions() const { return m_sessions; }
    QString activeSessionId() const { return m_activeSessionId; }
    Q_INVOKABLE void setActiveSessionId(const QString &id);
    QString activeAgentId() const { return m_agentId; }
    QString activeState() const { return m_activeState; }

    bool rootBackendsLoaded() const { return m_rootBackendsLoaded; }
    QStringList availableBackends() const { return m_availableBackends; }
    bool rootAgentsLoaded() const { return m_rootAgentsLoaded; }
    QStringList availableAgents() const { return m_availableAgents; }
    bool rootModelsLoaded() const { return m_rootModelsLoaded; }
    QString currentBackend() const { return m_currentBackend; }
    bool daemonConnected() const { return m_daemonConnected; }
    Q_INVOKABLE bool agentConnected(const QString &sessionId, const QString &agentId) const;
    Q_INVOKABLE QString sessionConnectionColor(const QString &sessionId) const;
    Q_INVOKABLE void setCurrentBackend(const QString &backend) {
        if (m_currentBackend == backend) return;
        m_currentBackend = backend;
        emit currentBackendChanged();
    }

    Q_INVOKABLE void refreshSessions();
    Q_INVOKABLE QString readLog();
    Q_INVOKABLE QString readLogForSession(const QString &sessionId, const QString &agentId);
    Q_INVOKABLE bool submit(const QString &prompt);
    Q_INVOKABLE bool interrupt();
    Q_INVOKABLE bool kill();
    Q_INVOKABLE bool killSession(const QString &sessionId);
    Q_INVOKABLE QString getConfig();
    Q_INVOKABLE QStringList getAgents(const QString &sessionId);

    struct AgentRecord {
        QString id;
        QString name;
        bool connected = false;
    };

    QList<AgentRecord> readAgentRecords(const QString &sessionId);
    void reconcileAgentConnections(const QVariantList &sessions);
    void setAgentConnected(const QString &key, bool connected);
    QString agentKey(const QString &sessionId, const QString &agentId) const;
    Q_INVOKABLE void setActiveAgentId(const QString &agentId);
    Q_INVOKABLE void switchAgent(const QString &sessionId, const QString &agentId);
    Q_INVOKABLE void loadRootBackends();
    Q_INVOKABLE void loadRootAgents();
    Q_INVOKABLE QStringList getAvailableModels(const QString &backend) const;
    Q_INVOKABLE bool createSession(const QString &cwd, const QString &name, const QString &backend, const QString &model, const QString &agent, const QString &remote, const QString &agentAlias);
    Q_INVOKABLE bool createQuickSession();
    Q_INVOKABLE QString createAgent(const QString &sessionId, const QString &cwd, const QString &backend, const QString &model, const QString &agent, const QString &remote, const QString &agentAlias);
    Q_INVOKABLE bool killAgent(const QString &sessionId, const QString &agentId);
    Q_INVOKABLE bool renameSession(const QString &sessionId, const QString &newName);
    Q_INVOKABLE bool renameAgent(const QString &sessionId, const QString &agentId, const QString &newName);

signals:
    void sessionsChanged();
    void activeSessionIdChanged();
    void activeAgentIdChanged();
    void activeStateChanged();
    void chatReceived(const QString &text);
    void sessionConnected();
    void streamingDone();  // chat process exited (session killed)
    void rootBackendsLoadedChanged();
    void availableBackendsChanged();
    void rootAgentsLoadedChanged();
    void availableAgentsChanged();
    void rootModelsLoadedChanged();
    void currentBackendChanged();
    void daemonConnectedChanged();

private:
    void stopAgentStreams();
    void stopStreams();
    QString agentPath() const;
    QByteArray run9p(const QStringList &args);
    void ensureRootDataLoaded();
    void setDaemonConnected(bool connected);
    void startAgentConnections();
    void startActiveAgentStreams();
    void reconcileAgentConnections();
    void stopAgentConnections();

    QVariantList m_sessions;
    QString m_activeSessionId;
    QString m_activeState = "idle";
    QString m_agentId;

    // Root data cache
    bool m_rootBackendsLoaded = false;
    QStringList m_availableBackends;
    bool m_rootAgentsLoaded = false;
    QStringList m_availableAgents;
    bool m_rootModelsLoaded = false;
    QVariantMap m_rootModels;
    QString m_currentBackend;
    bool m_daemonConnected = false;
    QHash<QString, NinePConnection *> m_agentConnections;
    QHash<QString, bool> m_agentConnected;
    QSet<QString> m_seenAgentConnections;
    NinePConnection *m_daemon = nullptr;

    // Streaming FSMs — each wraps a QProcess lifecycle
    StreamFsm *m_chat = nullptr;   // Oneshot  — reads agent chat log
    StreamFsm *m_state = nullptr;  // Guarded  — reads agent statewait
    StreamFsm *m_event = nullptr;  // Looping  — reads server eventwait
};

#endif // OLLIE9PCLIENT_H