#lang scheme/base
(require scheme/class fluxus-016/fluxus "logic.ss" "view.ss")
(provide (all-defined-out))

; reads input events and tells the logic side what to do

(define controller%
  (class object% 
    (init-field
     (game-view #f))
    
    (field 
     (fwd (vector 0 0 1))
     (up (vector 0 1 0))
     (pos (vector 0 0 0))
     (mtx (mident))
     (cam (build-locator))
     (current-twig #f)
     (current-twig-growing #f)
     (current-point 0)
     (tilt 0)
     (yaw 0)
     (player-plant #f)
     (player-pos (vector 0 0 0))
	 (last-pos (vector 0 0 0))
	 (debounce-space #t)
	 (seed-return #f)
	 (seed-return-timer 0)
	 (seed-return-secs-per-point 3)
	 (twig-stack '()))   
    
    (define/public (set-player-plant s)
      (set! pos (send s get-pos))
      (set! player-pos (send s get-pos))
      (set! player-plant s))
    
    (define/public (get-cam-obj)
      cam)
    
    (define/public (set-pos s)
      (set! pos s))
    
    (define/public (set-fwd s)
      (set! fwd s))
    
    (define/public (get-fwd)
      fwd)
    
    (define/public (setup)
      (lock-camera cam)
      (camera-lag 0.2)
      (clip 1 100)
      (set-camera-transform (mtranslate (vector 0 0 -4))))
    
	    ; moveme
    (define (collide? line objs)
        (foldl
         (lambda (ob r)
           (if r r
               (with-primitive ob
                               (cond ((bb/point-intersect? (cadr line) 0)
                                      (cond
                                        ((not (null? (geo/line-intersect 
                                                      (car line) (cadr line))))
                                         #t)                                        
                                        (else #f)))
                                     (else #f)))))
                                      
         #f
         objs))

	
	
    (define/public (update t d)
      (when (and (key-pressed " ") debounce-space (not current-twig-growing))
	      (set! seed-return #f)
	      (set! debounce-space #f)
		  (set! last-pos pos)
          (cond (current-twig      
               (let ((new-twig (send player-plant add-sub-twig current-twig current-point 
                                     (vector 0 1 0) #;(vsub (send current-twig get-point current-point)
                                                            (send current-twig get-point (- current-point 1))))))
                 (set! current-twig-growing #t)
				 (set! twig-stack (cons (list current-point current-twig) twig-stack))
                 (set! current-twig new-twig)))
              (else
               (set! current-twig (make-object twig-logic%  (vector 0 0 0) 0 player-plant 'root 
                                    (vmul fwd -1)
                                    start-twig-width (send player-plant get-twig-size) 'extruded))
               (send player-plant add-twig current-twig)
               (set! current-twig-growing #t))))			   
			   
	  (when (and (key-pressed " ") current-twig-growing)	  
	    (let ((vel (vmul fwd (* d -3))))
		  (when 
            (not (collide? (list pos (vadd pos vel)) (send game-view get-stones)))
  	  	    (set! pos (vadd pos vel))
		    (when (> (vdist last-pos pos) (send current-twig get-dist))
		  		(set! last-pos pos)		  		
		  		(send player-plant grow (vsub pos player-pos))))))
				
	  (when (and (not current-twig-growing) (not (key-pressed " ")))
	     (set! debounce-space #t))
      
      (when (or (key-pressed "a") (key-special-pressed 100)) (set! yaw (+ yaw 2)))
      (when (or (key-pressed "d") (key-special-pressed 102)) (set! yaw (- yaw 2)))
      (when (or (key-pressed "w") (key-special-pressed 101)) (set! tilt (- tilt 2)))
      (when (or (key-pressed "s") (key-special-pressed 103)) (set! tilt (+ tilt 2)))  
            
      ; clamp tilt to prevent gimbal lock
      (when (> tilt 88) (set! tilt 88))
      (when (< tilt -88) (set! tilt -88))
      	  
	  (when seed-return
	  	(cond ((< current-point 2)
		      (cond ((null? twig-stack)
	              (set! current-twig #f)
    	          (set! pos player-pos) 
				  (set! seed-return #f))
			   (else
            	 (set! current-point (car (car twig-stack)))
             	 (set! current-twig (cadr (car twig-stack)))
				 (set! twig-stack (cdr twig-stack)))))
			     
			(else
		 (set! seed-return-timer (- seed-return-timer d))
		 (set! pos (vadd player-pos (vmix (send current-twig get-point current-point)
		 							      (send current-twig get-point (- current-point 1))
										  (/ seed-return-timer seed-return-secs-per-point))))
		 (when (< seed-return-timer 0)
		    (set! seed-return-timer seed-return-secs-per-point)
			(set! current-point (- current-point 1))))))
      
      ; get camera fwd vector from key-presses                   
      (set! fwd (vtransform (vector 0 0 1) 
                            (mmul 
                             (mrotate (vector 0 yaw 0))
                             (mrotate (vector tilt 0 0)))))
      
      
      ; if we are on a twig not growing
     (when (and current-twig-growing (not (send current-twig growing?)))
         (set! current-twig-growing #f)			
		 (set! seed-return #t)
         (set! current-point (- (send current-twig get-num-points) 1)))

      (let* ((side (vnormalise (vcross up fwd)))
             (up (vnormalise (vcross fwd side))))
        
        (with-primitive cam
                        (identity)
                        (concat (vector (vx side) (vy side) (vz side) 0
                                        (vx up) (vy up) (vz up) 0
                                        (vx fwd) (vy fwd) (vz fwd) 0
                                        (vx pos) (vy pos) (vz pos) 1)))))
    
    (super-new)))