;;~ title    "Shipping cost optimization"
;;~ author   "lacuna"
;;~ version  1
;;~ mode     automation
;;~ flavor   light-purple
;;~ id       shipping-cost-optimization
;;~ trigger  analysis-pattern
;;~ touches  ()
;;~ summary  "Compare actual shipping cost paid vs charged across recent orders, propose template changes."

;; Fetch shipping events from the ledger for the last 90 days. Reason
;; over per-template paid-vs-charged delta. Sonnet proposes the
;; template edits with rationale + expected per-order delta.

(cart 'shipping-cost-optimization
  '((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/ledger (list 'shipping '90d) 'check-fetch))

(define (check-fetch ctx)
  (let ((r (ctx-result ctx)))
    (cond
      ((null? r)                       (escalate 'no-data null))
      ((eq? r 'rate-limited)           (after 30 'fetch ctx))
      (else                            (next 'reason (ctx-set 'shipping-rows r ctx))))))

(define (reason ctx)
  (let ((rows (ctx-get 'shipping-rows ctx)))
    (act 'sakura/cloud-reason
         (list 'task 'shipping-cost-optimization rows)
         'check-reason)))

(define (check-reason ctx)
  (let ((r (ctx-result ctx)))
    (cond
      ((null? r)                       (escalate 'cloud-empty null))
      ((not (string? r))               (escalate 'cloud-garbled null))
      ((eq? r 'cloud-quota-exhausted)  (escalate 'cloud-quota null))
      ((eq? r 'cloud-consent-required) (escalate 'cloud-consent null))
      (else                            (next 'announce (ctx-set 'plan r ctx))))))

(define (announce ctx) (done))