// :autocmd BufWritePost *.cpp :silent exec "!./build 2"
#include <fstream>
#include <iostream>
#include <numeric>
#include <string>
#include <vector>

struct Data {
  int64_t min;
  int64_t max;
};

using std::cout, std::endl, std::vector, std::ifstream;

int64_t part_1(const vector<Data> &);
unsigned long long part_2(const vector<Data> &);

int main() {
  ifstream file{"input/2025-2.txt"};
  Data line;
  char throwaway;
  vector<Data> v;
  while (file >> line.min >> throwaway >> line.max) {
    v.push_back(line);
    file >> throwaway;
  }
  cout << "Part 1: " << part_1(v) << endl;
  cout << "Part 2: " << part_2(v) << endl;
}

int64_t part_1(const vector<Data> &v) {
  int64_t answer{0};
  for (auto d : v) {
    for (auto n{d.min}; n <= d.max; ++n) {
      auto temp{std::to_string(n)};
      auto lhs{temp.substr(0, (temp.size() / 2))};
      auto rhs{temp.substr(lhs.size())};
      if (lhs == rhs) {
        answer += std::stoll(lhs + rhs);
      }
    }
  }
  return answer;
}

int64_t solve_n(int64_t n) {
  auto n_str{std::to_string(n)};
  for (size_t i{1}; i <= n_str.size() / 2; ++i) {
    auto lhs{n_str.substr(0, i)};
    if (n_str.size() % lhs.size() == 0) {
      int64_t repeat_cnt = n_str.size() / lhs.size();
      std::string comparator{""};
      for (auto i{0}; i < repeat_cnt; ++i) {
        comparator += lhs;
      }
      if (comparator == n_str) {
        return n;
      }
    }
  }
  return 0;
}

unsigned long long part_2(const vector<Data> &v) {
  unsigned long long ans{0};
  for (auto d : v) {
    for (auto n{d.min}; n <= d.max; ++n) {
      ans += solve_n(n);
    }
  }

  // todo: dead code, delete me
  unsigned long long foobar = std::accumulate(v.begin(), v.end(), 0, [&ans](unsigned long long acc, Data d) {
    for (auto n{d.min}; n <= d.max; ++n) {
          acc += solve_n(n);
    }
    return acc;
  });

  // help please :)
  // why ans != foobar? looks like same but not same
  // stepping through with debugger, it even seems the same on last iteration of accumulate

  return ans;
}