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#pragma once
#include "common.h"
#include <iostream>
namespace aoc2020 {
struct passport {
line_view byr;
line_view iyr;
line_view eyr;
line_view hgt;
line_view hcl;
line_view ecl;
line_view pid;
line_view cid;
friend std::ostream& operator<<(std::ostream& o, const passport& p) {
o << p.byr << " " << p.iyr << " " << p.eyr << " ";
o << p.hgt << " " << p.hcl << " " << p.ecl << " ";
o << p.pid << " " << p.cid << " ";
return o;
}
void get_number(const char** pp, int* d) {
const char* p = *pp;
while (*p >= '0' && *p <= '9') {
*d = *d * 10 + *p - '0';
p++;
}
*pp = p;
}
typedef bool (passport::*cf)(line_view);
template <int A, int B, int C>
bool chk1(line_view lv) {
int y{0};
const char* p = lv.line;
get_number(&p, &y);
return lv.length == A && y >= B && y <= C;
}
bool chk2(line_view lv) {
int d{0};
const char* p = lv.line;
get_number(&p, &d);
bool b1 = (*p == 'c' && *(p + 1) == 'm') && d >= 150 && d <= 193;
bool b2 = (*p == 'i' && *(p + 1) == 'n') && d >= 59 && d <= 76;
return b1 || b2;
}
bool chk3(line_view lv) {
static const char* cs[] = {"amb", "blu", "brn", "gry", "grn", "hzl", "oth"};
for (auto c : cs) {
if (lv == c) {
return true;
}
}
return false;
}
template <int A, char B, char C>
bool chk4(line_view lv) {
const char* p = lv.line;
for (int i = 0; i < A; i++) {
if (*(p + i) < B || *(p + i) > C) {
return false;
}
}
return lv.length == A;
}
bool chk5(line_view lv) {
const char* p = lv.line + 1;
auto is_az = [](char c) { return c >= 'a' && c <= 'z'; };
auto is_09 = [](char c) { return c >= '0' && c <= '9'; };
while (p < lv.line + lv.length) {
if (!is_az(*p) && !is_09(*p)) {
return false;
}
p++;
}
return *lv.line == '#' && lv.length == 7;
}
// byr (Birth Year) - four digits; at least 1920 and at most 2002.
// iyr (Issue Year) - four digits; at least 2010 and at most 2020.
// eyr (Expiration Year) - four digits; at least 2020 and at most 2030.
// hgt (Height) - a number followed by either cm or in:
// If cm, the number must be at least 150 and at most 193.
// If in, the number must be at least 59 and at most 76.
// hcl (Hair Color) - a # followed by exactly six characters 0-9 or a-f.
// ecl (Eye Color) - exactly one of: amb blu brn gry grn hzl oth.
// pid (Passport ID) - a nine-digit number, including leading zeroes.
// cid (Country ID) - ignored, missing or not.
void is_valid(bool* b1, bool* b2) {
*b1 = byr.length > 0 && iyr.length > 0 && eyr.length > 0 && hgt.length > 0 && hcl.length > 0 && ecl.length > 0 &&
pid.length > 0;
*b2 = false;
if (*b1) {
struct {
cf f;
line_view* field;
} checkers[] = {
{&passport::chk1<4, 1920, 2002>, &byr},
{&passport::chk1<4, 2010, 2020>, &iyr},
{&passport::chk1<4, 2020, 2030>, &eyr},
{&passport::chk2, &hgt},
{&passport::chk5, &hcl},
{&passport::chk3, &ecl},
{&passport::chk4<9, '0', '9'>, &pid},
};
for (auto c : checkers) {
if (!((this->*(c.f))(*c.field))) {
return;
}
}
*b2 = true;
}
}
passport(const char* p1, const char* p2) {
struct {
line_view* field;
const char* label;
} attributes[] = {{&byr, "byr"}, {&iyr, "iyr"}, {&eyr, "eyr"}, {&hgt, "hgt"},
{&hcl, "hcl"}, {&ecl, "ecl"}, {&pid, "pid"}, {&cid, "cid"}};
auto set_field = [&attributes](const char* p1, const char* p2) {
auto match = [](const char* x, const char* y) -> bool {
for (int i : {0, 1, 2}) {
if (*(x + i) != *(y - (3 - i))) {
return false;
}
}
return true;
};
for (auto& a : attributes) {
if (match(a.label, p1)) {
*a.field = line_view{p1 + 1, p2};
break;
}
}
};
const char* p = p1;
while (p < p2) {
if (*p == ':') {
p1 = p;
}
if (*p == ' ' || *p == '\n') {
set_field(p1, p);
}
p++;
}
set_field(p1, p);
}
};
std::pair<int, int> day4(line_view);
} // namespace aoc2020
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