;;; simple test procedures
#!r6rs
(import
  (rnrs)
  (rnrs mutable-pairs)
  (srfi :19 time)
  (srfi :48 intermediate-format-strings))

(define (printf fmt-str . args)
  (display (apply format fmt-str args)))

(define s19-tests (list))

(define (define-s19-test! name thunk)
  (let ((name (if (symbol? name) name (string->symbol name)))
	(pr (assoc name s19-tests)))
    (if pr
	(set-cdr! pr thunk)
	(set! s19-tests (append s19-tests (list (cons name thunk)))))))

(define (run-s19-test name thunk verbose)
  (if verbose (begin (display ";;; Running ") (display name)))
  (let ((result (thunk)))
    (if verbose (begin (display ": ") (display (not (not result))) (newline)))
    result))

(define (run-s19-tests . verbose)
  (let ((runs 0) (goods 0) (bads 0) (verbose (if (cdr verbose) (cdr verbose) #f)))
    (for-each (lambda (pr)
		(set! runs (+ runs 1))
		(if (run-s19-test (car pr) (cdr pr) verbose)
		    (set! goods (+ goods 1))
		    (set! bads (+ bads 1))))
	      s19-tests)
    (if verbose
	(begin
	  (display ";;; Results: Runs: ")
	  (display runs)
	  (display "; Goods: ")
	  (display goods)
	  (display "; Bads: ")
	  (display bads)
	  (if (> runs 0)
	      (begin
		(display "; Pass rate: ")
		(display (/ goods runs)))
	      (display "; No tests."))
	  (newline)))
    (values runs goods bads)))

(set! s19-tests (list))

(define-s19-test! "Creating time structures"
  (lambda ()
    (not (null? (list (current-time 'time-tai)
		      (current-time 'time-utc)
		      (current-time 'time-monotonic)
		      #|(current-time 'time-thread)
		      (current-time 'time-process)|#)))))

(define-s19-test! "Testing time resolutions"
  (lambda ()
    (not (null? (list (time-resolution 'time-tai)
		      (time-resolution 'time-utc)
		      (time-resolution 'time-monotonic)
		      #|(time-resolution 'time-thread)
		      (time-resolution 'time-process)|#)))))

(define-s19-test! "Time comparisons (time=?, etc.)"
  (lambda ()
    (let ((t1 (make-time 'time-utc 0 1))
	  (t2 (make-time 'time-utc 0 1))
	  (t3 (make-time 'time-utc 0 2))
	  (t11 (make-time 'time-utc 1001 1))
	  (t12 (make-time 'time-utc 1001 1))
	  (t13 (make-time 'time-utc 1001 2))
	  )
      (and (time=? t1 t2)
	   (time>? t3 t2)
	   (time<? t2 t3)
	   (time>=? t1 t2)
	   (time>=? t3 t2)
	   (time<=? t1 t2)
	   (time<=? t2 t3)
	   (time=? t11 t12)
	   (time>? t13 t12)
	   (time<? t12 t13)
	   (time>=? t11 t12)
	   (time>=? t13 t12)
	   (time<=? t11 t12)
	   (time<=? t12 t13)
	   ))))

(define-s19-test! "Time difference"
  (lambda ()
    (let ((t1 (make-time 'time-utc 0 3000))
	  (t2 (make-time 'time-utc 0 1000))
	  (t3 (make-time 'time-duration 0 2000))
	  (t4 (make-time 'time-duration 0 -2000)))
      (and
       (time=? t3 (time-difference t1 t2))
       (time=? t4 (time-difference t2 t1))))))


(define (test-one-utc-tai-edge utc tai-diff tai-last-diff)
  (let* (;; right on the edge they should be the same
	 (utc-basic (make-time 'time-utc 0 utc))
	 (tai-basic (make-time 'time-tai 0 (+ utc tai-diff)))
	 (utc->tai-basic (time-utc->time-tai utc-basic))
	 (tai->utc-basic (time-tai->time-utc tai-basic))
	 ;; a second before they should be the old diff
	 (utc-basic-1 (make-time 'time-utc 0 (- utc 1)))
	 (tai-basic-1 (make-time 'time-tai 0 (- (+ utc tai-last-diff) 1)))
	 (utc->tai-basic-1 (time-utc->time-tai utc-basic-1))
	 (tai->utc-basic-1 (time-tai->time-utc tai-basic-1))
	 ;; a second later they should be the new diff
	 (utc-basic+1 (make-time 'time-utc 0 (+ utc 1)))
	 (tai-basic+1 (make-time 'time-tai 0 (+ (+ utc tai-diff) 1)))
	 (utc->tai-basic+1 (time-utc->time-tai utc-basic+1))
	 (tai->utc-basic+1 (time-tai->time-utc tai-basic+1))
	 ;; ok, let's move the clock half a month or so plus half a second
	 (shy (* 15 24 60 60))
	 (hs (/ (expt 10 9) 2))
	 ;; a second later they should be the new diff
	 (utc-basic+2 (make-time 'time-utc hs (+ utc shy)))
	 (tai-basic+2 (make-time 'time-tai hs (+ (+ utc tai-diff) shy)))
	 (utc->tai-basic+2 (time-utc->time-tai utc-basic+2))
	 (tai->utc-basic+2 (time-tai->time-utc tai-basic+2))
	 )
    (and (time=? utc-basic tai->utc-basic)
	 (time=? tai-basic utc->tai-basic)
	 (time=? utc-basic-1 tai->utc-basic-1)
	 (time=? tai-basic-1 utc->tai-basic-1)
	 (time=? utc-basic+1 tai->utc-basic+1)
	 (time=? tai-basic+1 utc->tai-basic+1)
	 (time=? utc-basic+2 tai->utc-basic+2)
	 (time=? tai-basic+2 utc->tai-basic+2) 
	 )))

(define-s19-test! "TAI-UTC Conversions"
  (lambda ()
    (and
     (test-one-utc-tai-edge 915148800  32 31)
     (test-one-utc-tai-edge 867715200  31 30)
     (test-one-utc-tai-edge 820454400  30 29)
     (test-one-utc-tai-edge 773020800  29 28)
     (test-one-utc-tai-edge 741484800  28 27)
     (test-one-utc-tai-edge 709948800  27 26)
     (test-one-utc-tai-edge 662688000  26 25)
     (test-one-utc-tai-edge 631152000  25 24)
     (test-one-utc-tai-edge 567993600  24 23)
     (test-one-utc-tai-edge 489024000  23 22)
     (test-one-utc-tai-edge 425865600  22 21)
     (test-one-utc-tai-edge 394329600  21 20)
     (test-one-utc-tai-edge 362793600  20 19)
     (test-one-utc-tai-edge 315532800  19 18)
     (test-one-utc-tai-edge 283996800  18 17)
     (test-one-utc-tai-edge 252460800  17 16)
     (test-one-utc-tai-edge 220924800  16 15)
     (test-one-utc-tai-edge 189302400  15 14)
     (test-one-utc-tai-edge 157766400  14 13)
     (test-one-utc-tai-edge 126230400  13 12)
     (test-one-utc-tai-edge 94694400   12 11)
     (test-one-utc-tai-edge 78796800   11 10)
     (test-one-utc-tai-edge 63072000   10 0)
     (test-one-utc-tai-edge 0   0 0) ;; at the epoch
     (test-one-utc-tai-edge 10   0 0) ;; close to it ...
     (test-one-utc-tai-edge 1045789645 32 32) ;; about now ...
     )))

(define (tm:date= d1 d2)
  (and (= (date-year d1) (date-year d2))
       (= (date-month d1) (date-month d2))
       (= (date-day d1) (date-day d2))
       (= (date-hour d1) (date-hour d2))
       (= (date-second d1) (date-second d2))
       (= (date-nanosecond d1) (date-nanosecond d2))
       (= (date-zone-offset d1) (date-zone-offset d2))))

(define-s19-test! "TAI-Date Conversions"
  (lambda ()
    (and
     (tm:date= (time-tai->date (make-time time-tai 0 (+ 915148800 29)) 0)
	       (make-date 0 58 59 23 31 12 1998 0))
     (tm:date= (time-tai->date (make-time time-tai 0 (+ 915148800 30)) 0)
	       (make-date 0 59 59 23 31 12 1998 0))
     (tm:date= (time-tai->date (make-time time-tai 0 (+ 915148800 31)) 0)
	       (make-date 0 60 59 23 31 12 1998 0))
     (tm:date= (time-tai->date (make-time time-tai 0 (+ 915148800 32)) 0)
	       (make-date 0 0 0 0 1 1 1999 0)))))

(define-s19-test! "Date-UTC Conversions"
  (lambda ()
    (and
     (time=? (make-time time-utc 0 (- 915148800 2))
	     (date->time-utc (make-date 0 58 59 23 31 12 1998 0)))
     (time=? (make-time time-utc 0 (- 915148800 1))
	     (date->time-utc (make-date 0 59 59 23 31 12 1998 0)))
     ;; yes, I think this is acutally right.
     (time=? (make-time time-utc 0 (- 915148800 0))
	     (date->time-utc (make-date 0 60 59 23 31 12 1998 0)))
     (time=? (make-time time-utc 0 (- 915148800 0))
	     (date->time-utc (make-date 0 0 0 0 1 1 1999 0)))
     (time=? (make-time time-utc 0 (+ 915148800 1))
	     (date->time-utc (make-date 0 1 0 0 1 1 1999 0))))))

(define-s19-test! "TZ Offset conversions"
  (lambda ()
    (let ((ct-utc (make-time time-utc 6320000 1045944859))
	  (ct-tai (make-time time-tai 6320000 1045944891))
	  (cd (make-date 6320000 19 14 15 22 2 2003 -18000)))
      (and
       (time=? ct-utc (date->time-utc cd))
       (time=? ct-tai (date->time-tai cd))))))

(begin (newline) (run-s19-tests #t))


(define (date->string/all-formats)
  ;; TODO: figure out why ~f isn't working
  ;; TODO: figure out why ~x and ~X aren't doing what the srfi-19 doc says they do
  (define fs
    '("~~" "~a" "~A" "~b" "~B" "~c" "~d" "~D" "~e" #;"~f" "~h" "~H"
      "~I" "~j" "~k" "~l" "~m" "~M" "~n" "~N" "~p" "~r" "~s"
      "~S" "~t" "~T" "~U" "~V" "~w" "~W" "~x" "~X" "~y" "~Y"
      "~z" "~Z" "~1" "~2" "~3" "~4" "~5"))
  (define cd (current-date))
  (display "\n;;; Running date->string format exercise\n")
  (printf "(current-date)\n => ~s\n" cd)
  (for-each
   (lambda (f)
     (printf "\n--- Format: ~a ----------------------------------------\n" f) 
     (display (date->string cd f)) (newline))
   fs))

;;TODO
#;(define (string->date/all-formats)
  )

(date->string/all-formats)
#;(string->date/all-formats)