PlugBoard.cpp

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#include "PlugBoard.hpp"
#include <iostream>
#include <numeric>
#include <stdexcept>
#include <string>
#include "config.hpp"
 
PlugBoard::PlugBoard() { std::iota(mapping.begin(), mapping.end(), 0); }
 
PlugBoard::PlugBoard(const std::array<PlugBoardPair, PLUGBOARD_MAX_PAIRS>& pairs) : PlugBoard() {
    for (const auto& [sourcePortIndex, destinationPortIndex] : pairs) {
        // Skip uninitialized/empty pairs
        if (sourcePortIndex == -1 || destinationPortIndex == -1) {
            continue;
        }
 
        if (sourcePortIndex < 0 || sourcePortIndex >= TRANSFORMER_SIZE || destinationPortIndex < 0 ||
            destinationPortIndex >= TRANSFORMER_SIZE) {
            throw std::invalid_argument("PlugBoard error: Port index out of range (" + std::to_string(sourcePortIndex) +
                                        ", " + std::to_string(destinationPortIndex) + ").");
        }
 
        if (sourcePortIndex == destinationPortIndex) {
            continue;
        }
 
        if (mapping.at(sourcePortIndex) != sourcePortIndex ||
            mapping.at(destinationPortIndex) != destinationPortIndex) {
            throw std::invalid_argument("PlugBoard error: Conflict for pair (" + std::to_string(sourcePortIndex) +
                                        ", " + std::to_string(destinationPortIndex) + "). Port already in use.");
        }
 
        mapping.at(sourcePortIndex) = destinationPortIndex;
        mapping.at(destinationPortIndex) = sourcePortIndex;
    }
}
 
AlphabetIndex PlugBoard::swap(AlphabetIndex key) const {
    if (key < 0 || key >= TRANSFORMER_SIZE) {
        return key;
    }
    return mapping.at(key);
}