#include <aocpp/Parsing.hpp>
#include <aocpp/Startup.hpp>

#include <boost/spirit/include/qi.hpp>
#include <boost/fusion/include/std_tuple.hpp>

#include <cstdint>
#include <iostream>
#include <string_view>
#include <string>
#include <tuple>
#include <vector>

namespace qi = boost::spirit::qi;

using std::istream;
using std::ostream;
using std::size_t;
using std::string_view;
using std::string;
using std::tuple;
using std::uint64_t;
using std::vector;

namespace {

auto ways(vector<string> const& towels, string const& design) -> uint64_t
{
  vector<uint64_t> counts(design.size() + 1);
  counts[0] = 1;

  for (size_t i = 0; i < design.size(); i++) {
    auto const suffix = string_view{ begin(design) + i, end(design) };
    for (auto && towel : towels) {
      if (suffix.starts_with(towel)) {
        counts[i + towel.size()] += counts[i];
      }
    }
  }

  return counts.back();
}

} // namespace

auto Main(istream & in, ostream & out) -> void
{
  auto const [towels, designs] = 
    aocpp::ParseSimple
      <tuple<vector<string>, vector<string>>>
      (in, +qi::alpha % ", " >> "\n\n" >> *(+qi::alpha >> "\n"));

  uint64_t p1 = 0, p2 = 0;
  for (auto && d : designs) {
    auto const n = ways(towels, d);
    if (n > 0) { p1++; }
    p2 += n;
  }

  out << "Part 1: " << p1 << "\n"
      << "Part 2: " << p2 << "\n";
}