(module (s9fes char-canvas shape hgroup)

(;export
  ;
  real-shape-hgroup
  ;
  shape-hgroup)

(import scheme utf8)
(import (chicken base))
(import (chicken fixnum))
(import (chicken type))
(import (only (srfi 1) list-copy))
(import record-variants)
(import (s9fes char-canvas)
        (s9fes char-canvas rect)
        (s9fes char-canvas shape shape)
        (s9fes char-canvas shape shape group))

(include-relative "s9fes.char-canvas.types")
(include-relative "s9fes.char-canvas.inlines")

(include-relative "s9fes.char-canvas.shape.types")
(include-relative "s9fes.char-canvas.shape.inlines")

;group rest arg is (list-of shape-plotter) or (list (list-ofshape-plotter))
;due to new group not using `apply'

(: real-shape-hgroup (#!rest real-shape-plotter -> real-shape-plotter))
(: shape-hgroup (#!rest shape-plotter -> shape-plotter))

;; Private

(define-inline (%info-elements info) (the shape-plotters (@info 0 info)))

(define (*new-hgroup info elms)
  (case (@info-coords info)
    ((real) (real-shape-hgroup elms))
    (else   (shape-hgroup elms))) )

(define (*canvas-draw-hgroup cv x0 y0 shps)
  ;FIXME
  (define (next shp x y) (receive (w h) (shape-size shp) (values (fx+ x w) y)))
  (let loop ((shps shps) (x x0) (y y0))
    (unless (null? shps)
      (let ((shp (car shps)))
        (shp cv x y)
        (receive (x y) (next shp x y)
          (loop (cdr shps) x y) ) ) ) )
  cv )

(define (*canvas-plot-hgroup cv x0 y0 shps)
  ;FIXME
  (define (next shp x y) (receive (w h) (shape-size shp) (values x (+ y h))))
  (let loop ((shps shps) (x x0) (y y0))
    (unless (null? shps)
      (let ((shp (car shps)))
        (shp cv x y)
        (receive (x y) (next shp x y)
          (loop (cdr shps) x y) ) ) ) )
  cv )

;; Public

(define (real-shape-hgroup . args)
  (let ((shps (if (%length-1/kind? args list?) (car args) args)))
    (assert (%shapes? shps) 'real-shape-hgroup "bad argument type - not list-of shape" shps)
    (shape-lambda-info!
      (lambda (#!optional cv x0 y0)
        (if cv
            (*canvas-draw-hgroup cv x0 y0 shps)
            (^real-info 'hgroup shps) ) ) ) ) )

(define (shape-hgroup . args)
  (let ((shps (if (%length-1/kind? args list?) (car args) args)))
    (assert (%shapes? shps) 'shape-hgroup "bad argument type - not list-of shape" shps)
    (shape-lambda-info!
      (lambda (#!optional cv x0 y0)
        (if cv
            (*canvas-plot-hgroup cv x0 y0 shps)
            (^virtual-info 'hgroup shps) ) ) ) ) )

;;

(define (class-shape-size shp info)
  (let* ((shps (%info-elements info))
         (sizs (map (lambda (shp) (receive (shape-size shp))) shps)) )
    (values (apply + (map car sizs)) (apply max (map cadr sizs))) ) )

(define (class-shape-layout shp info bb parent)
  (receive (jshps ret-wd ret-ht)
           (group-layout shp (%info-elements info) bb parent
                         (lambda (lbb)
                           (let ((lbb-x (%rect-x lbb)) (lbb-y (%rect-y lbb))
                                 (lbb-wd (%rect-wd lbb)) (lbb-ht (%rect-ht lbb)) )
                             (values (%rect lbb-x (%rect-y bb)
                                            lbb-wd (%rect-ht bb))
                                     (+ lbb-x lbb-wd)
                                     (%rect-y bb)))))
;(print "hgroup layout res " ret-wd " " ret-ht)
   (if jshps (*new-hgroup info jshps)
        (error 'hgroup-layout "overflows bounding-box" ret-wd ret-ht bb)) ) )

(register-shape 'hgroup shape-hgroup real-shape-hgroup)
(register-shape-method 'hgroup 'size class-shape-size)
(register-shape-method 'hgroup 'cardinality class-group-cardinality)
(register-shape-method 'hgroup 'elements class-group-elements)
(register-shape-method 'hgroup 'layout class-shape-layout)
(register-shape-method 'hgroup 'justified? class-group-justified?)
(register-shape-method 'hgroup 'reify-args class-group-reify-args)
(register-shape-method 'hgroup 'reflect class-group-reflect)

) ;module (s9fes char-canvas shape hgroup)