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#!/usr/bin/env guile
!#
(use-modules (ice-9 rdelim))
(define port (open-input-file "input"))
(define seed
(let ()
(define nums-str
(string-trim
(list-ref (string-split (read-line port) #\:) 1)))
(define (pairing l)
(define (loop ret l)
(if (null? l)
ret
(loop
(cons (cons
(car l)
(+ (car l) (cadr l)))
ret)
(cddr l))))
(loop '() l))
(reverse
(pairing (map string->number (string-split nums-str #\space))))))
(read-line port)
(define (read-line-convert-eof port)
(define line (read-line port))
(if (eof-object? line) "" line))
(define (read-map)
(define (loop ret)
(define line (string-trim (read-line-convert-eof port)))
(if (= 0 (string-length line))
(sort (reverse ret) (lambda (x y) (< (cadr x) (cadr y))))
(loop (cons (map string->number (string-split line #\space))
ret))))
(read-line port)
(loop '()))
(define s2s (read-map))
(define s2f (read-map))
(define f2w (read-map))
(define w2l (read-map))
(define l2t (read-map))
(define t2h (read-map))
(define h2l (read-map))
(define maps (list s2s s2f f2w w2l l2t t2h h2l))
(define (range-map mlist r)
;; r :: Range :: (start . end)
;; mlist :: List of (Map :: (dest, src, len))
(define (loop result mlist r)
(define start (car r))
(define end (cdr r))
(if (null? mlist)
(cons r result)
(let ()
(define cur-map (car mlist))
(define map-target (car cur-map))
(define map-start (cadr cur-map))
(define map-end (+ map-start (caddr cur-map)))
(define offset (- map-target map-start))
(define (pair-offset p) (cons (+ offset (car p)) (+ offset (cdr p))))
(cond ((<= end start)
result)
((>= start map-end)
(loop result (cdr mlist) r))
((>= start map-start)
(loop
(cons (pair-offset (cons start (min end map-end)))
result)
(cdr mlist)
(cons (min end map-end) end)))
((<= end map-start)
(cons r result))
((< start map-start)
(loop
(cons (cons start map-start) result)
mlist
(cons map-start end)))
(else (error "unhandled cond in range-map"))))))
(reverse (loop '() mlist r)))
(define (gen-range-mapper the-map)
(define (mapper range-list)
(apply append
(map
(lambda (range)
(range-map the-map range))
range-list)))
mapper)
(define mappers (map gen-range-mapper maps))
(define (comp-func funcs)
(define procs (reverse funcs))
(define (comp-rec arg)
(if (null? procs)
arg
(let ((proc (car procs))
(rest (cdr procs)))
(set! procs rest)
(proc (comp-rec arg)))))
comp-rec)
(define (find-location x)
((comp-func mappers) x))
(display (apply min (map car (find-location seed))))
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