/**
 * @file llgestureautocompletehelper.h
 *
 * $LicenseInfo:firstyear=2026&license=viewerlgpl$
 * Second Life Viewer Source Code
 * Copyright (C) 2026, Linden Research, Inc.
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation;
 * version 2.1 of the License only.
 *
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
 *
 * Linden Research, Inc., 945 Battery Street, San Francisco, CA  94111  USA
 * $/LicenseInfo$
 */

#pragma once

#include "llhandle.h"
#include "llsingleton.h"

#include <boost/signals2.hpp>
#include <functional>
#include <string>
#include <vector>

class LLFloater;
class LLUICtrl;

class LLGestureAutocompleteHelper : public LLSingleton<LLGestureAutocompleteHelper>
{
    LLSINGLETON(LLGestureAutocompleteHelper) {}
    ~LLGestureAutocompleteHelper() override {}

public:
    struct Row
    {
        std::string value;
        std::string trigger;
        std::string name;
    };

    bool isActive(const LLUICtrl* ctrl) const;
    void showHelper(
        LLUICtrl* host_ctrl,
        const std::vector<Row>& rows,
        size_t total,
        std::function<void(std::string)> commit_cb);
    void hideHelper(const LLUICtrl* ctrl = nullptr);
    bool handleKey(const LLUICtrl* ctrl, KEY key, MASK mask);
    void onCommitGesture(const std::string& trigger);

    const std::vector<Row>& rows() const { return mRows; }
    size_t total() const { return mTotal; }

protected:
    void setHostCtrl(LLUICtrl* host_ctrl);
    LLUICtrl* getHostCtrl() const { return mHostHandle.get(); }

private:
    void refreshPicker();

    LLHandle<LLUICtrl>  mHostHandle;
    LLHandle<LLFloater> mHelperHandle;
    boost::signals2::connection mHostCtrlFocusLostConn;
    boost::signals2::connection mHelperCommitConn;
    std::function<void(std::string)> mGestureCommitCb;

    std::vector<Row> mRows;
    size_t mTotal = 0;
};