// 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/>.

#include "KeyDispatcher.hpp"

#include <cassert>
#include <cstddef>

#include <string>

#include "engine/keys.h"

using namespace vle;

KeyDispatcher::KeyDispatcher() : lastResult(0)
{ }

void
KeyDispatcher::dispatch(wchar_t key)
{
    buffer.push_back(key);

    std::size_t counter = vle_keys_counter();
    lastResult = vle_keys_exec(buffer.c_str());

    std::size_t consumedCount = vle_keys_counter() - counter;
    if (consumedCount > 0) {
        assert(consumedCount <= buffer.size());
        buffer.erase(0, consumedCount);
    }

    if (lastResult == KEYS_UNKNOWN) {
        reset();
    }
}

std::wstring
KeyDispatcher::getPendingInput() const
{
    return buffer;
}

void
KeyDispatcher::reset()
{
    buffer.clear();
    lastResult = 0;
}