// 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__MODES_HPP__
#define LIBVLE__MODES_HPP__

#include <string>
#include <unordered_map>
#include <vector>

#include "Mode.hpp"

namespace vle {

// Handles initialization and deinitialization of modes.
class Modes
{
public:
    // Initializes no modes.
    Modes();
    // Deinitializes all modes.
    ~Modes();

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

public:
    // Initializes modes.  Throws `std::invalid_argument` on duplicated mode ids
    // or empty list of modes.
    void setModes(std::vector<Mode> modesInfo);
    // Switches to the mode specified by its id.  Throws `std::invalid_argument`
    // on unknown mode id.
    void switchTo(const std::string &modeId);

private:
    // Deinitializes all modes.
    void reset();
    // Initializes modes.  Throws `std::invalid_argument` on duplicated mode
    // ids.
    void init(std::vector<Mode> &&modesInfo);

private:
    // Data that describes modes.
    std::unordered_map<std::string, Mode> modes;
    // Key processing flags of each mode.
    std::vector<int> modeKeyFlags;
};

}

#endif // LIBVLE__MODES_HPP__