// libvle -- library for building Vim-like applications
// Copyright (C) 2019 xaizek <xaizek@posteo.net>
//
// This file is part of libvle.
//
// libvle is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// libvle 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 General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with libvle.  If not, see <https://www.gnu.org/licenses/>.

#ifndef LIBVLE__KEYDISPATCHER_HPP__
#define LIBVLE__KEYDISPATCHER_HPP__

#include <string>

namespace vle {

// Dispatches input events and manages current input state.
class KeyDispatcher
{
public:
    // Setups an empty state.
    KeyDispatcher();

    KeyDispatcher(const KeyDispatcher &rhs) = delete;
    KeyDispatcher(KeyDispatcher &&rhs) = delete;
    KeyDispatcher & operator=(const KeyDispatcher &rhs) = delete;
    KeyDispatcher & operator=(KeyDispatcher &&rhs) = delete;

public:
    // Processes the key updating state and triggering matched shortcuts of
    // current mode.
    void dispatch(wchar_t key);

    // Retrieves current state of the input buffer that has not yet been
    // processed.
    std::wstring getPendingInput() const;

    // Resets to an empty state.
    void reset();

private:
    std::wstring buffer; // Current input sequence.
    int lastResult;      // Result of the last attempt to process input sequence
                         // or 0.
};

}

#endif // LIBVLE__KEYDISPATCHER_HPP__