#include "elna/history.hpp"

namespace elna
{
    editor_history::editor_history()
        : commands{}, current_pointer(commands.cend())
    {
    }

    void editor_history::push(const std::string& entry)
    {
        commands.push_back(entry);
        current_pointer = commands.cend();
    }

    void editor_history::clear()
    {
        commands.clear();
        current_pointer = commands.cend();
    }

    editor_history::const_iterator editor_history::prev() noexcept
    {
        if (this->current_pointer != cbegin())
        {
            this->current_pointer = std::prev(this->current_pointer);
        }
        return this->current_pointer;
    }

    editor_history::const_iterator editor_history::next() noexcept
    {
        if (this->current_pointer != cend())
        {
            this->current_pointer = std::next(this->current_pointer);
        }
        return this->current_pointer;
    }

    editor_history::const_iterator editor_history::cbegin() const noexcept
    {
        return this->commands.cbegin();
    }

    editor_history::const_iterator editor_history::cend() const noexcept
    {
        return this->commands.cend();
    }

    editor_history::const_iterator editor_history::current() const noexcept
    {
        return this->current_pointer;
    }
}