;;~ title    "Favorites velocity watcher"
;;~ author   "lacuna"
;;~ version  1
;;~ mode     automation
;;~ flavor   pink
;;~ id       favorites-velocity-watcher
;;~ trigger  cron:daily
;;~ touches  ()
;;~ summary  "Daily: which listings picked up favorites fastest in the last 24h. Catch the climbers early."

;; Pulls active listings + 24h favorite delta from Cortex, ranks by
;; velocity, returns the top movers as a table. The numeric work is
;; pure Scheme; we don't need the model here.

(cart 'favorites-velocity-watcher
  '((author    . "lacuna")
    (version   . 1)
    (read-only . #t)))

(define (start ctx)
  (let ((connected (ctx-get 'shop-connected ctx)))
    (cond
      ((not connected) (escalate 'shop-not-connected null))
      (else            (next 'fetch ctx)))))

(define (fetch ctx)
  (act 'etsy/listings (list 'favorites-velocity '24h) 'render))

(define (render ctx)
  (let ((rows (ctx-result ctx)))
    (cond
      ((null? rows)              (escalate 'no-data null))
      ((eq? rows 'rate-limited)  (after 30 'fetch ctx))
      (else                      (begin
                                   (table rows '(listing-id title favs-24h velocity))
                                   (done))))))