;;-*-Lisp-*-
(in-package goal)

;; name: elevator.gc
;; name in dgo: elevator
;; dgos: GAME, COMMON

;; +++elevator-flags
(defenum elevator-flags
  :type uint64
  :bitfield #t
  (elevator-flags-0)
  (elevator-flags-1)
  (elevator-flags-2)
  (elevator-flags-3)
  (elevator-flags-4)
  (prevent-jump)
  (elevator-flags-6)
  (elevator-flags-7)
  (elevator-flags-8)
  (elevator-flags-9)
  (elevator-flags-10)
  (elevator-flags-11)
  (elevator-flags-12)
  (elevator-flags-13)
  (elevator-flags-14)
  (elevator-flags-15)
  (airlock-opened)
  (elevator-flags-17)
  )
;; ---elevator-flags


;; +++elevator-status
(defenum elevator-status
  :type uint64
  :bitfield #t
  (waiting-to-descend)
  (waiting-to-ascend)
  (moving)
  (elevator-status-3)
  (elevator-status-4)
  (elevator-status-5)
  (elevator-status-6)
  (elevator-status-7)
  (elevator-status-8)
  (elevator-status-9)
  )
;; ---elevator-status


;; DECOMP BEGINS

(deftype elevator-params (structure)
  ((xz-threshold  float)
   (y-threshold   float)
   (start-pos     float)
   (move-rate     float)
   (flags         elevator-flags)
   )
  )


(deftype path-step (structure)
  ((next-pos  float)
   (dist      float)
   )
  )


(deftype path-step-inline-array (inline-array-class)
  ((data  path-step  :inline :dynamic)
   )
  )


(set! (-> path-step-inline-array heap-base) (the-as uint 16))

(deftype elevator (base-plat)
  ((params                        elevator-params  :inline)
   (path-seq                      path-step-inline-array)
   (path-dest                     float)
   (bottom-top                    float            2)
   (move-pos                      float            2)
   (move-dist                     float)
   (path-pos                      float)
   (path-eased-pos                float)
   (ride-timer                    time-frame)
   (sticky-player-last-ride-time  time-frame)
   (elevator-status               elevator-status)
   (on-activate                   pair)
   (on-deactivate                 pair)
   )
  (:state-methods
    dormant
    waiting
    running
    arrived
    )
  (:methods
    (elevator-method-38 (_type_) none)
    (calc-dist-between-points! (_type_ int int) none)
    (activate-elevator (_type_) object)
    (init-defaults! (_type_) none)
    (set-ambient-sound! (_type_) none)
    (move-between-points (_type_ vector float float) symbol)
    (elevator-method-44 (_type_) symbol)
    (commited-to-ride? (_type_) symbol)
    (move-to-next-point! (_type_) none)
    (find-closest-point-in-path! (_type_ vector (pointer float) symbol symbol) symbol)
    (elevator-method-48 (_type_) none)
    )
  )


(defmethod move-between-points ((this elevator) (arg0 vector) (arg1 float) (arg2 float))
  "Move between two points on the elevator's path
@param vec TODO not sure
@param point-a The first point fetched from the elevator's path
@param point-b The second point fetched from the path
@see [[path-control]] and [[elevator]]"
  #f
  )

(defmethod elevator-method-48 ((this elevator))
  "TODO - collision related"
  (let ((target *target*))
    (when target
      (let ((s4-0 (-> target control collision-spheres 0))
            (s5-0 (new 'stack-no-clear 'collide-query))
            )
        (set! (-> s5-0 start-pos quad) (-> s4-0 prim-core world-sphere quad))
        (+! (-> s5-0 start-pos y) 8192.0)
        (set! (-> s5-0 start-pos w) 1.0)
        (vector-reset! (-> s5-0 move-dist))
        (set! (-> s5-0 move-dist y) -90112.0)
        (let ((collide-query s5-0))
          (set! (-> collide-query radius) (-> s4-0 local-sphere w))
          (set! (-> collide-query collide-with) (collide-spec hit-by-others-list pusher))
          (set! (-> collide-query ignore-process0) target)
          (set! (-> collide-query ignore-process1) #f)
          (set! (-> collide-query ignore-pat) (-> target control pat-ignore-mask))
          (set! (-> collide-query action-mask) (collide-action solid))
          )
        (let ((f0-5 (fill-and-probe-using-line-sphere *collide-cache* s5-0)))
          (when (< 0.0 f0-5)
            (vector-float*! (-> s5-0 move-dist) (-> s5-0 move-dist) f0-5)
            (vector+! (-> s5-0 move-dist) (-> s5-0 move-dist) (-> s5-0 start-pos))
            (vector-! (-> s5-0 move-dist) (-> s5-0 move-dist) (the-as vector (-> s4-0 prim-core)))
            (move-by-vector! (-> target control) (-> s5-0 move-dist))
            )
          )
        )
      )
    )
  (none)
  )

(defmethod init-defaults! ((this elevator))
  "Initializes default settings related to the [[elevator]]:
- `elevator-xz-threshold`
- `elevator-y-threshold`
- `elevator-start-pos`
- `elevator-move-rate`
- `elevator-flags`"
  (let ((entity (-> this entity)))
    (set! (-> this params xz-threshold) ((method-of-object entity get-property-value-float)
                                         entity
                                         'elevator-xz-threshold
                                         'interp
                                         -1000000000.0
                                         81920.0
                                         (the-as (pointer res-tag) #f)
                                         *res-static-buf*
                                         )
          )
    (set! entity (-> this entity))
    (set! (-> this params y-threshold) ((method-of-object entity get-property-value-float)
                                        entity
                                        'elevator-y-threshold
                                        'interp
                                        -1000000000.0
                                        20480.0
                                        (the-as (pointer res-tag) #f)
                                        *res-static-buf*
                                        )
          )
    (set! entity (-> this entity))
    (set! (-> this params start-pos) ((method-of-object entity get-property-value-float)
                                      entity
                                      'elevator-start-pos
                                      'interp
                                      -1000000000.0
                                      0.0
                                      (the-as (pointer res-tag) #f)
                                      *res-static-buf*
                                      )
          )
    (set! entity (-> this entity))
    (set! (-> this params move-rate) ((method-of-object entity get-property-value-float)
                                      entity
                                      'elevator-move-rate
                                      'interp
                                      -1000000000.0
                                      25600.0
                                      (the-as (pointer res-tag) #f)
                                      *res-static-buf*
                                      )
          )
    (set! entity (-> this entity))
    (set! (-> this params flags) (the-as elevator-flags ((method-of-object entity get-property-value)
                                                         entity
                                                         'elevator-flags
                                                         'interp
                                                         -1000000000.0
                                                         (the-as uint128 1)
                                                         (the-as (pointer res-tag) #f)
                                                         *res-static-buf*
                                                         )
                                         )
          )
    )
  0
  (none)
  )

(defun ease-value-in-out ((value float) (step-amount float))
  "TODO - the math in this function is full of duplication and isn't totally clear
but if the name is to be believed, it's to slow a values grow at the beginning and end of it's range
which is obviously useful for an elevator."
  (let* ((step step-amount)
         (f4-0 (- 1.0 step-amount))
         (f3-0 (/ step (- 1.0 f4-0)))
         (f2-1 (* step step))
         (f1-6 (+ (* 2.0 step (- f4-0 step)) f2-1))
         (f1-7 (+ (* (- 1.0 f4-0) (- 1.0 f4-0) f3-0) f1-6))
         )
    (/ (cond
         ((< value step)
          (* value value)
          )
         ((< value f4-0)
          (+ (* 2.0 step (- value step)) f2-1)
          )
         (else
           (let ((f0-7 (- 1.0 value)))
             (- f1-7 (* f0-7 f0-7 f3-0))
             )
           )
         )
       f1-7
       )
    )
  )

;; WARN: disable def twice: 11. This may happen when a cond (no else) is nested inside of another conditional, but it should be rare.
(defbehavior elevator-event elevator ((proc process) (arg1 int) (event-type symbol) (event event-message-block))
  (case event-type
    (('status?)
     (and (= (the float (/ (the-as int (-> event param 0)) 8)) (-> self move-pos 0))
          (= (the float (/ (the-as int (-> event param 1)) 8)) (-> self move-pos 1))
          )
     )
    (('ridden)
     (let ((proc-focus (handle->process (-> (the-as focus (-> event param 0)) handle))))
       (if (= (-> proc-focus type) target)
           (set-time! (-> self sticky-player-last-ride-time))
           )
       )
     #t
     )
    (('use-camera)
     (if (-> event param 0)
         (set-setting! 'entity-name (-> event param 0) 0.0 0)
         (remove-setting! 'entity-name)
         )
     )
    (('move-to)
     (when (and (-> self next-state) (let ((next-state-0 (-> self next-state name)))
                                       (or (= next-state-0 'waiting) (= next-state-0 'arrived))
                                       )
                )
       (set! (-> self move-pos 0) (-> self move-pos 1))
       (cond
         ((not (logtest? (-> event param 0) 7))
          (let ((gp-0 (the-as number (-> event param 0))))
            (set! (-> self move-pos 1) (if (type? (the-as uint gp-0) float)
                                           (the-as float gp-0)
                                           )
                  )
            )
          )
         (else
           (case (-> event param 0)
             (('quote 'bottom)
              (set! (-> self move-pos 1) (-> self bottom-top 0))
              )
             (('quote 'top)
              (set! (-> self move-pos 1) (-> self bottom-top 1))
              )
             )
           )
         )
       (go-virtual running)
       )
     )
    (('jump-to)
     (cond
       ((not (logtest? (-> event param 0) 7))
        (let ((gp-1 (the-as number (-> event param 0))))
          (set! (-> self move-pos 1) (if (type? (the-as uint gp-1) float)
                                         (the-as float gp-1)
                                         )
                )
          )
        )
       (else
         (case (-> event param 0)
           (('quote 'bottom)
            (set! (-> self move-pos 1) (-> self bottom-top 0))
            )
           (('quote 'top)
            (set! (-> self move-pos 1) (-> self bottom-top 1))
            )
           )
         )
       )
     (set! (-> self move-pos 0) (-> self move-pos 1))
     (get-point-in-path! (-> self path) (-> self basetrans) (-> self move-pos 0) 'interp)
     (go-virtual waiting)
     )
    (('trigger)
     (when (and (-> self next-state) (let ((next-state-1 (-> self next-state name)))
                                       (or (= next-state-1 'waiting) (= next-state-1 'arrived))
                                       )
                )
       (set! (-> self move-pos 0) (-> self move-pos 1))
       (cond
         ((= (-> self move-pos 0) (-> self bottom-top 0))
          (set! (-> self move-pos 1) (-> self bottom-top 1))
          )
         ((= (-> self move-pos 0) (-> self bottom-top 1))
          (set! (-> self move-pos 1) (-> self bottom-top 0))
          )
         )
       (go-virtual running)
       )
     )
    (('query)
     (case (-> event param 0)
       (('waiting?)
        (and (-> self next-state) (= (-> self next-state name) 'waiting))
        )
       (('arrived?)
        (and (-> self next-state) (let ((v1-61 (-> self next-state name)))
                                    (or (= v1-61 'arrived) (= v1-61 'waiting))
                                    )
             )
        )
       (('running?)
        (and (-> self next-state) (= (-> self next-state name) 'running))
        )
       (('path-pos?)
        (+ (-> self move-pos 0) (* (-> self path-pos) (- (-> self move-pos 1) (-> self move-pos 0))))
        )
       (('player-standing-on?)
        (= (-> self sticky-player-last-ride-time) (current-time))
        )
       (('point-inside-shaft?)
        (move-between-points self (the-as vector (-> event param 1)) (-> self bottom-top 1) (-> self bottom-top 0))
        )
       (('going-down?)
        (< (-> (get-point-in-path! (-> self path) (new 'stack-no-clear 'vector) (-> self move-pos 1) 'interp) y)
           (-> (get-point-in-path! (-> self path) (new 'stack-no-clear 'vector) (-> self move-pos 0) 'interp) y)
           )
        )
       (('going-up?)
        (< (-> (get-point-in-path! (-> self path) (new 'stack-no-clear 'vector) (-> self move-pos 0) 'interp) y)
           (-> (get-point-in-path! (-> self path) (new 'stack-no-clear 'vector) (-> self move-pos 1) 'interp) y)
           )
        )
       )
     )
    (('go-dormant)
     (go-virtual dormant)
     )
    (else
      (plat-event proc arg1 event-type event)
      )
    )
  )

(defmethod find-closest-point-in-path! ((this elevator) (arg0 vector) (arg1 (pointer float)) (arg2 symbol) (arg3 symbol))
  "Finds and sets the provided [[path-step]]'s `next-pos` field to the vertex index in the path which is closest to
the provided [[vector]]

@param vec The point at which distance calculations are based off
@param! next-step If a point is found, `next-pos` will be set to the correct point
@param arg2 TODO
@param arg3 TODO
@returns [[#t]] if a point in the path was found"
  (local-vars (path-point vector))
  (let ((elev-params (-> this params))
        (smallest-dist 0.0)
        (point-idx-tracker -1.0)
        )
    (dotimes (path-vertex-idx (-> this path curve num-cverts))
      (set! path-point
            (get-point-in-path! (-> this path) (new 'stack-no-clear 'vector) (the float path-vertex-idx) 'interp)
            )
      (when (and (or (not arg2) (< (vector-vector-xz-distance path-point arg0) (-> elev-params xz-threshold)))
                 (or (not arg3)
                     (< (fabs (- (-> path-point y) (-> arg0 y))) (-> elev-params y-threshold))
                     (and (= path-vertex-idx (the int (-> this bottom-top 0))) (< (-> arg0 y) (-> path-point y)))
                     (and (= path-vertex-idx (the int (-> this bottom-top 1))) (< (-> path-point y) (-> arg0 y)))
                     )
                 )
        (let* ((t9-2 vector-vector-distance)
               (a1-3 arg0)
               (dist (t9-2 path-point a1-3))
               )
          (when (or (= point-idx-tracker -1.0) (< dist smallest-dist))
            (set! smallest-dist dist)
            (set! point-idx-tracker (the float path-vertex-idx))
            )
          )
        )
      )
    (when (!= point-idx-tracker -1.0)
      (set! (-> arg1 0) point-idx-tracker)
      #t
      )
    )
  )

;; WARN: Return type mismatch object vs symbol.
(defmethod elevator-method-44 ((this elevator))
  (let* ((target-temp *target*)
         (target (if (type? target-temp process-focusable)
                     target-temp
                     )
                 )
         )
    (the-as
      symbol
      (and target (move-between-points this (get-trans target 0) (-> this move-pos 0) (-> this move-pos 1)))
      )
    )
  )

(defmethod commited-to-ride? ((this elevator))
  "@returns if the target is considered within the elevator area enough to begin descending/ascending"
  #t
  )

(defmethod move-to-next-point! ((this elevator))
  "If the [[*target*]] is in a valid state and there is a point to transition to in the elevator's path
do so.
@see [[elevator::47]]"
  (local-vars (zero float))
  (let ((target *target*))
    (when (and target
               (not (logtest? (focus-status dead inactive in-air grabbed edge-grab pole pilot-riding pilot teleporting)
                              (-> target focus-status)
                              )
                    )
               )
      (set! zero (the-as float 0.0))
      (when (and (find-closest-point-in-path! this (get-trans target 0) (& zero) #t #t) (!= (-> this move-pos 1) zero))
        (set! (-> this move-pos 0) (-> this move-pos 1))
        (set! (-> this move-pos 1) zero)
        (logior! (-> this elevator-status) (elevator-status moving))
        (go (method-of-object this running))
        )
      )
    )
  0
  (none)
  )

(defbehavior move-post elevator ()
  (when (nonzero? (-> self sound))
    (let ((f0-3 (sqrtf (sin-rad (* 3.1415925 (-> self path-pos))))))
      (update-vol! (-> self sound) f0-3)
      )
    (update-trans! (-> self sound) (-> self root trans))
    (update! (-> self sound))
    )
  (plat-post)
  (none)
  )

(defstate dormant (elevator)
  :virtual #t
  :event (behavior ((proc process) (argc int) (message symbol) (block event-message-block))
    (case message
      (('trigger)
       (go-virtual waiting)
       )
      (('bonk)
       #f
       )
      (else
        (plat-event proc argc message block)
        )
      )
    )
  :trans plat-trans
  :code sleep-code
  :post plat-post
  )

(defstate waiting (elevator)
  :virtual #t
  :event (behavior ((proc process) (argc int) (message symbol) (block event-message-block))
    (case message
      (('ridden)
       (if (commited-to-ride? self)
           (logior! (-> self elevator-status) (elevator-status waiting-to-descend))
           )
       (elevator-event proc argc message block)
       )
      (else
        (elevator-event proc argc message block)
        )
      )
    )
  :enter (behavior ()
    (set-time! (-> self ride-timer))
    (logclear! (-> self elevator-status) (elevator-status waiting-to-descend moving))
    (logior! (-> self mask) (process-mask actor-pause))
    (if (nonzero? (-> self sound))
        (update-vol! (-> self sound) 0.0)
        )
    )
  :trans (behavior ()
    (plat-trans)
    (when (not (logtest? (-> self elevator-status) (elevator-status waiting-to-descend)))
      (set-time! (-> self ride-timer))
      (-> self params)
      (if (and (logtest? (-> self params flags) (elevator-flags elevator-flags-0))
               (not (logtest? (-> self params flags) (elevator-flags elevator-flags-3)))
               )
          (move-to-next-point! self)
          )
      )
    (when (and (not (logtest? (-> self params flags) (elevator-flags elevator-flags-3)))
               (time-elapsed? (-> self ride-timer) (seconds 1))
               )
      (set! (-> self move-pos 0) (-> self move-pos 1))
      (set! (-> self move-pos 1) (-> self path-seq data (the int (-> self move-pos 1)) next-pos))
      (go-virtual running)
      )
    )
  :code sleep-code
  :post (behavior ()
    (logclear! (-> self elevator-status) (elevator-status waiting-to-descend))
    (debug-draw (-> self path))
    (plat-post)
    )
  )

(defstate running (elevator)
  :virtual #t
  :event (behavior ((proc process) (argc int) (message symbol) (block event-message-block))
    (case message
      (('running?)
       #t
       )
      (('player-ridden?)
       (logtest? (-> self elevator-status) (elevator-status waiting-to-descend))
       )
      (else
        (elevator-event proc argc message block)
        )
      )
    )
  :enter (behavior ()
    (if (not (logtest? (-> self params flags) (elevator-flags elevator-flags-7)))
        (process-entity-status! self (entity-perm-status no-kill) #t)
        )
    (logclear! (-> self elevator-status) (elevator-status waiting-to-ascend))
    (when (logtest? (-> self params flags) (elevator-flags elevator-flags-2))
      (logclear! (-> self params flags) (elevator-flags elevator-flags-2))
      (logior! (-> self params flags) (elevator-flags elevator-flags-0))
      )
    (set! (-> self move-dist) 0.0)
    (let ((v1-13 (the int (-> self move-pos 0)))
          (a0-3 (the int (-> self move-pos 1)))
          (a1-1 0)
          )
      (while (let ((a2-3 (abs (- a0-3 v1-13))))
               (< a1-1 a2-3)
               )
        (+! (-> self move-dist) (-> self path-seq data (+ (min v1-13 a0-3) a1-1) dist))
        (+! a1-1 1)
        )
      )
    (logclear! (-> self mask) (process-mask actor-pause))
    (set-setting! 'board #f 0.0 0)
    (let ((gp-0 (-> self on-activate)))
      (if gp-0
          (script-eval gp-0 :key (* (the int (-> self move-pos 0)) 8) :vector (-> self root trans))
          )
      )
    (set! (-> self path-pos) 0.0)
    (if (nonzero? (-> self sound))
        (update-vol! (-> self sound) 0.0)
        )
    (when (logtest? (-> self params flags) (elevator-flags prevent-jump))
      (set-setting! 'jump #f 0.0 0)
      (apply-settings *setting-control*)
      )
    )
  :exit (behavior ()
    (if (not (logtest? (-> self params flags) (elevator-flags elevator-flags-7)))
        (process-entity-status! self (entity-perm-status no-kill) #f)
        )
    (remove-setting! 'board)
    (if (logtest? (-> self params flags) (elevator-flags prevent-jump))
        (remove-setting! 'jump)
        )
    )
  :trans (behavior ()
    (if (and (not (logtest? (-> self elevator-status) (elevator-status waiting-to-ascend)))
             (= (-> self path-pos) 1.0)
             )
        (go-virtual arrived)
        )
    (if (elevator-method-44 self)
        (set! (-> self path-dest) 0.0)
        (set! (-> self path-dest) 1.0)
        )
    (if (logtest? (-> self params flags) (elevator-flags prevent-jump))
        (elevator-method-48 self)
        )
    (plat-trans)
    )
  :code (behavior ()
    (logior! (-> self elevator-status) (elevator-status waiting-to-ascend))
    (until #f
      (suspend)
      (if (= (-> self path-pos) 1.0)
          (logclear! (-> self elevator-status) (elevator-status waiting-to-ascend))
          )
      )
    #f
    )
  :post (behavior ()
    (when (logtest? (-> self elevator-status) (elevator-status waiting-to-ascend))
      (seek!
        (-> self path-pos)
        (-> self path-dest)
        ;; og:preserve-this pc port fast elevator option
        (* (/ (* (#if PC_PORT (if (eligible-for-fast-elevator? *pc-settings* self) 1.5 1.0)
                              1.0)
              (-> self params move-rate)) (-> self move-dist)) (seconds-per-frame))
        )
      (let* ((f30-0 (-> self move-pos 0))
             (f28-0 (-> self move-pos 1))
             (f0-9 (+ f30-0 (* (ease-value-in-out (-> self path-pos) 0.08) (- f28-0 f30-0))))
             )
        (get-point-in-path! (-> self path) (-> self basetrans) f0-9 'interp)
        )
      )
    (move-post)
    )
  )

(defstate arrived (elevator)
  :virtual #t
  :event (behavior ((proc process) (argc int) (message symbol) (block event-message-block))
    (case message
      (('ridden)
       (set-time! (-> self ride-timer))
       (elevator-event proc argc message block)
       )
      (else
        (elevator-event proc argc message block)
        )
      )
    )
  :enter (behavior ()
    (set-time! (-> self ride-timer))
    (if (not (-> *setting-control* user-current jump))
        (remove-setting! 'jump)
        )
    (let ((gp-0 (-> self on-deactivate)))
      (if gp-0
          (script-eval gp-0 :key (* (the int (-> self move-pos 1)) 8) :vector (-> self root trans))
          )
      )
    )
  :trans (behavior ()
    (if (and (< (- (-> self ride-timer) (-> self sticky-player-last-ride-time)) (seconds 2))
             (begin *target* *target*)
             (focus-test? *target* in-air)
             )
        (set-time! (-> self ride-timer))
        )
    (when (or (logtest? (-> self elevator-status) (elevator-status moving))
              (time-elapsed? (-> self ride-timer) (seconds 0.5))
              )
      (cond
        ((and (logtest? (-> self params flags) (elevator-flags elevator-flags-1))
              (!= (-> self move-pos 1) (-> self params start-pos))
              )
         (set! (-> self move-pos 0) (-> self move-pos 1))
         (set! (-> self move-pos 1) (-> self params start-pos))
         (go-virtual running)
         )
        (else
          (go-virtual waiting)
          )
        )
      )
    (plat-trans)
    )
  :code sleep-code
  :post plat-post
  )

(defmethod calc-dist-between-points! ((this elevator) (path-point-x int) (path-point-y int))
  "Calculates the distance between two points in the elevator's path.

@param path-point-x The index of the first point in the distance calculation, and where `next-pos` and `dist` are stored in the `path-seq` array
@param path-point-y The second point in the distance calculation"
  (set! (-> this path-seq data path-point-x next-pos) (the float path-point-y))
  (let ((point-x (get-point-in-path! (-> this path) (new 'stack-no-clear 'vector) (the float path-point-x) 'interp))
        (point-y (get-point-in-path! (-> this path) (new 'stack-no-clear 'vector) (the float path-point-y) 'interp))
        )
    (set! (-> this path-seq data path-point-x dist) (vector-vector-distance point-x point-y))
    )
  0
  (none)
  )

(defmethod set-ambient-sound! ((this elevator))
  "Sets the elevator's [[ambient-sound]] up"
  (set! (-> this sound) (the-as ambient-sound 0))
  0
  (none)
  )

(defmethod init-plat! ((this elevator))
  "Does any necessary initial platform setup.
For example for an elevator pre-compute the distance between the first and last points (both ways) and clear the sound."
  0
  (none)
  )

(defmethod relocate ((this elevator) (arg0 int))
  (if (nonzero? (-> this path-seq))
      (&+! (-> this path-seq) arg0)
      )
  (call-parent-method this arg0)
  )

(defmethod activate-elevator ((this elevator))
  "Puts the elevator initially into the correct state. This is typically based upon game completion"
  (if (logtest? (-> this params flags) (elevator-flags elevator-flags-6))
      (go (method-of-object this arrived))
      (go (method-of-object this waiting))
      )
  )

;; WARN: Return type mismatch object vs none.
(defmethod init-from-entity! ((this elevator) (entity entity-actor))
  "Typically the method that does the initial setup on the process, potentially using the [[entity-actor]] provided as part of that.
This commonly includes things such as:
- stack size
- collision information
- loading the skeleton group / bones
- sounds"
  (local-vars (sv-32 float) (sv-36 path-control) (sv-40 target))
  (init-plat-collision! this)
  (process-drawable-from-entity! this entity)
  (initialize-skeleton this (the-as skeleton-group (get-art-group this)) (the-as pair 0))
  (stop-bouncing! this)
  (set! (-> this elevator-status) (elevator-status))
  (update-transforms (-> this root))
  (base-plat-method-32 this)
  (init-defaults! this)
  (set! (-> this on-activate) (res-lump-struct (-> this entity) 'on-activate pair))
  (set! (-> this on-deactivate) (res-lump-struct (-> this entity) 'on-deactivate pair))
  (set! (-> this path) (new 'process 'path-control this 'path 0.0 entity #f))
  (if (logtest? (-> this path flags) (path-control-flag not-found))
      (go process-drawable-art-error "error in path")
      )
  (logior! (-> this path flags) (path-control-flag display draw-line draw-point draw-text))
  (let ((num-path-points (-> this path curve num-cverts))
        (s4-1 0)
        (f30-0 0.0)
        (f28-0 0.0)
        )
    (set! (-> this path-seq) (new 'process 'path-step-inline-array num-path-points))
    (dotimes (path-point-idx num-path-points)
      (calc-dist-between-points! this path-point-idx (mod (+ path-point-idx 1) num-path-points))
      (let ((v1-31 (get-point-in-path! (-> this path) (new 'stack-no-clear 'vector) (the float path-point-idx) 'interp)))
        (when (or (not (logtest? s4-1 1)) (< (-> v1-31 y) f28-0))
          (set! (-> this bottom-top 0) (the float path-point-idx))
          (set! f28-0 (-> v1-31 y))
          (set! s4-1 (logior s4-1 1))
          )
        (when (or (not (logtest? s4-1 2)) (< f30-0 (-> v1-31 y)))
          (set! (-> this bottom-top 1) (the float path-point-idx))
          (set! f30-0 (-> v1-31 y))
          (set! s4-1 (logior s4-1 2))
          )
        )
      )
    )
  (set! sv-32 (the-as float 0.0))
  (set! sv-36 (-> this path))
  (let ((s5-2 *target*))
    (set! sv-40 (if (type? s5-2 process-focusable)
                    s5-2
                    )
          )
    )
  (if (not (and sv-40
                (logtest? (-> this params flags) (elevator-flags elevator-flags-4))
                (find-closest-point-in-path! this (get-trans sv-40 0) (& sv-32) #f #t)
                )
           )
      (set! sv-32 (-> this params start-pos))
      )
  (set! (-> this move-pos 0) sv-32)
  (set! (-> this move-pos 1) sv-32)
  (get-point-in-path! sv-36 (-> this basetrans) sv-32 'interp)
  (set! (-> this root pause-adjust-distance)
        (+ 122880.0 (-> this params xz-threshold) (total-distance (-> this path)))
        )
  (set-ambient-sound! this)
  (init-plat! this)
  (activate-elevator this)
  (none)
  )