;; Scanlines effect - horizontal line overlay
;; Usage: python3 plan.py effects/scanlines.sexp -p spacing=3 -p intensity=0.4 | python3 execute.py - -d . -o output.mp4
;;
;; Parameters:
;;   spacing: pixels between lines (1 to 8, default: 3)
;;   intensity: line darkness (0 to 1, default: 0.4)

(recipe "scanlines"
  :version "1.0"
  :encoding (:codec "libx264" :crf 20 :preset "medium" :audio-codec "aac" :fps 30)

  (effect scanlines :path "sexp_effects/effects/scanlines.sexp")

  ;; Default parameters (overridden by -p spacing=N -p intensity=N)
  (def spacing 3)
  (def intensity 0.4)

  (def video (source :path "monday.webm"))
  (def clip (-> video (segment :start 0 :duration 10)))
  (def result (-> clip (effect scanlines :spacing spacing :intensity intensity)))
  result)