;; Wave effect - sinusoidal distortion
;; Usage: python3 plan.py effects/wave.sexp -p amplitude=30 -p wavelength=60 | python3 execute.py - -d . -o output.mp4
;;
;; Parameters:
;;   amplitude: wave height in pixels (5 to 100, default: 30)
;;   wavelength: wave period in pixels (20 to 200, default: 60)

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

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

  ;; Default parameters (overridden by -p amplitude=N -p wavelength=N)
  (def amplitude 30)
  (def wavelength 60)

  (def video (source :path "monday.webm"))
  (def clip (-> video (segment :start 0 :duration 10)))
  (def result (-> clip (effect wave :amplitude amplitude :wavelength wavelength)))
  result)