package com.tterrag.advent2018.days;

import java.util.regex.Matcher;
import java.util.regex.Pattern;

import com.tterrag.advent2018.util.Day;

import lombok.Value;

public class Day03 extends Day {

    public static void main(String[] args) {
        new Day03().run();
    }

    @Value
    private static class Claim {
        int id;
        int x, y, h, w;

        void fill(long[][] area) {
            for (int i = x; i < x + w && i < area.length; i++) {
                for (int j = y; j < y + h && j < area[i].length; j++) {
                    area[i][j]++;
                }
            }
        }

        private static Pattern PATTERN = Pattern.compile("#(\\d+)\\s@\\s(\\d+),(\\d+):\\s(\\d+)x(\\d+)");

        static Claim parse(String s) {
            Matcher m = PATTERN.matcher(s);
            if (!m.matches()) {
                throw new IllegalArgumentException();
            }
            return new Claim(Integer.parseInt(m.group(1)), Integer.parseInt(m.group(2)), Integer.parseInt(m.group(3)), Integer.parseInt(m.group(4)), Integer.parseInt(m.group(5)));
        }
    }

    private long[][] claims = new long[2000][2000];

    @Override
    protected Result doParts() {
        parse(Claim::parse).forEach(c -> {
            c.fill(claims);
        });

        int part1 = 0;
        for (int i = 0; i < claims.length; i++) {
            for (int j = 0; j < claims[i].length; j++) {
                if (claims[i][j] > 1) {
                    part1++;
                }
            }
        }

        return new Result(part1, "");
    }
}