#include "common.h"


namespace aoc2022 {

struct rucksacks {
  char rs1[52] = {0};
  char rs2[52] = {0};
  char rs3[52] = {0};

  void reset() {
    memset(rs1, 0, 52);
    memset(rs2, 0, 52);
    memset(rs3, 0, 52);
  }

  void load(const char *p, char rs[], int len) {
    int i{0};
    while (i++ < len) {
      char c = *p;
      if ( c >= 'a' && c <= 'z') {
        rs[c - 'a'] += 1;
      }
      if ( c >= 'A' && c <= 'Z') {
        rs[c - 'A' + 26] += 1;
      }
      p++;
    }
  }

  void load(line_view lv) {
    int len = (lv.length - 1) / 2;
    const char *p1 = lv.line;
    const char *p2 = lv.line + len;
    load(p1, rs1, len);
    load(p2, rs2, len);
  }

  void load(line_view lv, int i) {
    int len = (lv.length - 1);
    const char *p = lv.line;
    switch (i) {
      case 0: load(p, rs1, len); break;
      case 1: load(p, rs2, len); break;
      case 2: load(p, rs3, len); break;
    }
  }

  int score() const noexcept {
    for (int i = 0; i < 52; i++) {
      if (rs1[i] > 0 && rs2[i] > 0) {
        return i+1;
      }
    }
    return 0;
  }

  int score3() const noexcept {
    for (int i = 0; i < 52; i++) {
      if (rs1[i] > 0 && rs2[i] > 0 && rs3[i] > 0) {
        return i+1;
      }
    }
    return 0;
  }};

std::pair<int, int> day3(line_view file);

}