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#lang racket
(require "../../jj-aoc.rkt"
threading)
(define passports
(~> (open-day 4 2020) (port->string) (string-split "\n\n") (map (λ~> (string-replace "\n" " ")) _)))
;; part 1
(define required-fields (list "byr:" "iyr:" "eyr:" "hgt:" "hcl:" "ecl:" "pid:"))
(define (valid-passport? p)
(andmap (λ (s) (string-contains? p s)) required-fields))
(count valid-passport? passports)
;; part 2
(define passport-fields
(for/list ([p (in-list passports)] #:when (valid-passport? p))
(~> p string-split (map (curryr string-split ":") _) flatten (apply hash _))))
(define (between x low high)
(and (x . >= . low) (x . <= . high)))
(define (valid-byr? p)
(define year (string->number (hash-ref p "byr")))
(between year 1920 2002))
(define (valid-iyr? p)
(define year (string->number (hash-ref p "iyr")))
(between year 2010 2020))
(define (valid-eyr? p)
(define year (string->number (hash-ref p "eyr")))
(between year 2020 2030))
(define (valid-hgt? p)
(define height (hash-ref p "hgt"))
(cond
[(string-suffix? height "cm")
(let ([h (string->number (string-trim height "cm"))]) (between h 150 193))]
[(string-suffix? height "in")
(let ([h (string->number (string-trim height "in"))]) (between h 59 76))]
[else #false]))
(define (valid-hcl? p)
(define color (hash-ref p "hcl"))
(regexp-match #px"^#[0-9a-f]{6}$" color))
(define (valid-ecl? p)
(member (hash-ref p "ecl") (list "amb" "blu" "brn" "gry" "grn" "hzl" "oth")))
(define (valid-pid? p)
(regexp-match #px"^\\d{9}$" (hash-ref p "pid")))
(define (valid-stricter-passport? p)
(and (valid-byr? p)
(valid-iyr? p)
(valid-eyr? p)
(valid-hgt? p)
(valid-hcl? p)
(valid-ecl? p)
(valid-pid? p)))
(count valid-stricter-passport? passport-fields)
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