(load (sb-ext:posix-getenv "ASDF"))
(asdf:load-system 'cl-dates)

;; week is 7 days
;; 52 weeks in a year
;; 13 weeks in a quarter

;; cycle is 4 weeks
;; standing in for a month
;; 3 cycles in a quarter

;; quarter is 3 cycles + a week
;; 4 quarters in a year


; ---

(defun add-weeks (date weeks)
	(+ date (* weeks 7)))
(defun week-number (date)
	(mod (cl-dates:week-number date) 52))

(defun write-page-header (stream header-text)
  (format stream "
		#set page(
			paper: \"a4\",
			flipped: true,
			header: align(bottom)[~A],
			margin: (
        top: 1.5cm,
        bottom: 0.5cm,
        x: 0.5cm
      ))
		" header-text)
  )
(defun write-page-cycle (stream cl-date year-number quarter-number cycle-number)
  (write-page-header stream (format nil "Y~d #h(1fr) Q~d #h(1fr) C~d" year-number quarter-number cycle-number))
	(format stream "#table(
		columns: (auto ,1fr, 1fr, 1fr, 1fr, 1fr, 1fr, 1fr),
		rows: (auto, 1fr),
		table.header([],align(center)[Monday],align(center)[Tuesday],align(center)[Wednesday],align(center)[Thursday],align(center)[Friday],align(center)[Saturday],align(center)[Sunday])")
	(loop for week from 0 to 3
				do (format stream "~%,align(horizon)[#rotate(270deg, reflow: true)[Week ~d]]" (week-number (+ cl-date (* week 7))))
				do (loop for day from 0 to 6
							do (let ((cycle-day (+ cl-date day (* week 7))))
									 (multiple-value-bind (yy mm dd) (cl-dates:date->ymd cycle-day)
										 (if (= 1 dd)
											 (format stream ",[#h(1fr) ~A]" (cl-dates:month->string mm))
											 (format stream ",[#h(1fr) ~d]" dd))))))
	(format stream ")~%"))
(defun write-page-reset-week (stream cl-date year-number quarter-number)
  (write-page-header stream (format nil "Y~d #h(1fr) Q~d #h(1fr) Reset Week" year-number quarter-number))
  (format stream "#table(
		columns: (1fr, 1fr, 1fr),
		rows: (1fr),
		align(center)[_Going In_]")
	(loop for day from 0 to 6
				do (let* ((week-day (+ cl-date day))
								 (day-of-week (cl-dates:dow->string (cl-dates:day-of-week week-day))))
						 (multiple-value-bind (yy mm dd) (cl-dates:date->ymd week-day)
							 (if (= 1 dd)
								 (format stream ",[~A #h(1fr) ~A]~%" day-of-week (cl-dates:month->string mm))
								 (format stream ",[~A #h(1fr) ~d]~%" day-of-week dd))
							 )))
	(format stream ",align(center)[_Coming Out_]")
	(format stream ")~%"))
(defun write-pages-quarter (stream cl-date year-number quarter-number)
	(loop for c from 0 to 2 do (write-page-cycle stream (add-weeks cl-date (* c 4)) year-number quarter-number (+ c 1)))
	(write-page-reset-week stream (add-weeks cl-date 12) year-number quarter-number))
(with-open-file (stream "main.typ"
												:direction :output
												:if-exists :supersede
												:if-does-not-exist :create)
  (format stream "/* This is an auto-generated file
    You can run `sbcl --script ./cal.lisp` to create a new one */~%")
	(let ((year-start (cl-dates:ymd->date 2025 12 29)))
		(loop for q from 0 to 3 do (write-pages-quarter stream (add-weeks year-start (* q 13)) 2026 (+ q 1)))
		))