(use-modules (chickadee)
             (chickadee math vector)
             (chickadee math rect)
             (chickadee graphics font)
             (chickadee graphics tiled)
             (ice-9 format)
             (ice-9 match)
             (srfi srfi-11))

(define map #f)
(define camera #v(0.0 0.0))
(define text-position #v(4.0 4.0))
(define text "0, 0")

(define (load)
  (set! map (load-tile-map "maps/example.tmx")))

(define (draw alpha)
  (draw-tile-map map #:position camera)
  (draw-text text text-position))

(define inc 8.0)
(define (key-press key scancode modifiers repeat?)
  (match key
    ('up (set-vec2-y! camera (- (vec2-y camera) inc)))
    ('down (set-vec2-y! camera (+ (vec2-y camera) inc)))
    ('right (set-vec2-x! camera (- (vec2-x camera) inc)))
    ('left (set-vec2-x! camera (+ (vec2-x camera) inc)))
    ('q (abort-game))
    (_ #t)))

(define (mouse-move x y x-rel y-rel buttons)
  (let-values (((tx ty) (point->tile map x y)))
    (set! text (format #f "~d, ~d" tx ty))))

(run-game #:window-width 320
          #:window-height 240
          #:window-title "tile map demo"
          #:load load
          #:draw draw
          #:key-press key-press
          #:mouse-move mouse-move)