// Solutions to the Advent Of Code 2024.
// Copyright (C) 2025  Stefan Müller
//
// This program 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.
//
// This program 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
// this program.  If not, see <http://www.gnu.org/licenses/>.

#include <aoc/RestroomRedoubt.hpp>

#include <functional>
#include <numeric>
#include <sstream>

#include <aoc/Point2.hpp>

RestroomRedoubt::RestroomRedoubt(const int width, const int height)
    : width_{ width }, height_{ height }, halfWidth_{ width / 2 }, halfHeight_{ height / 2 }
{
    quadrants_.fill(0);
}

const std::string RestroomRedoubt::getPuzzleName() const
{
    return "Restroom Redoubt";
}

const int RestroomRedoubt::getPuzzleDay() const
{
    return 14;
}

void RestroomRedoubt::processDataLine(const std::string& line)
{
    std::istringstream stream{ line };
    char c;
    Point2 p;
    Point2 v;
    stream >> c >> c >> p.x >> c >> p.y >> c >> c >> v.x >> c >> v.y;

    Point2 position = p + v * getNPredictionSeconds();
    position.x %= width_;
    if (position.x < 0)
    {
        position.x += width_;
    }
    position.y %= height_;
    if (position.y < 0)
    {
        position.y += height_;
    }

    if (position.x < halfWidth_)
    {
        if (position.y < halfHeight_)
        {
            quadrants_[0]++;
        }
        else if (position.y > halfHeight_)
        {
            quadrants_[1]++;
        }
    }
    else if (position.x > halfWidth_)
    {
        if (position.y < halfHeight_)
        {
            quadrants_[2]++;
        }
        else if (position.y > halfHeight_)
        {
            quadrants_[3]++;
        }
    }
}

void RestroomRedoubt::finish()
{
    part1 = std::accumulate(quadrants_.cbegin(), quadrants_.cend(), 1, std::multiplies<int>{});
}

constexpr int RestroomRedoubt::getNPredictionSeconds()
{
    return 100;
}