;; Game state and logic for the hero entity
(define-module (game model hero)
  #:use-module (srfi srfi-9)
  #:use-module (srfi srfi-9 gnu)
  #:use-module (srfi srfi-64)
  #:use-module (chickadee math vector)
  #:export (hero-load
            hero-x hero-with-x
            hero-y hero-with-y
            hero-state hero-with-state
            hero-bloat hero-with-bloat
            hero-position
            ))


(define-immutable-record-type <hero>
  (%make-hero x y state bloat)
  hero?
  (x hero-x hero-with-x)
  (y hero-y hero-with-y)
  (state hero-state hero-with-state)                    ;; 'go-left 'go-right 'climb 'fall 'stationary
  (bloat hero-bloat hero-with-bloat)                    ;; 0.0 to 2.0, how much the hero is inflated
  )

(define default-x 320)
(define default-y 32)
(define default-state 'stationary)
(define default-bloat 1.0)

(define (hero-load)
  (%make-hero default-x default-y default-state default-bloat))

(define (hero-position hero)
  (vec2 (hero-x hero) (hero-y hero)))

;; Tests
[test-begin "hero model"]
(test-assert (hero? (hero-load)))
(test-equal default-x (hero-x (hero-load)))
(test-equal default-y (hero-y (hero-load)))
(test-equal default-state (hero-state (hero-load)))
(test-equal default-bloat (hero-bloat (hero-load)))

(let ((hero (hero-load)))
  (test-equal 10 (hero-x (hero-with-x hero 10)))
  (test-equal default-x (hero-x hero))
  (test-equal 20 (hero-y (hero-with-y hero 20))) 
  (test-equal default-y (hero-y hero))
  (test-equal 'go-left (hero-state (hero-with-state hero 'go-left)))
  (test-equal default-state (hero-state hero))
  (test-equal 1.5 (hero-bloat (hero-with-bloat hero 1.5)))
  (test-equal default-bloat (hero-bloat hero)))

(test-equal (vec2 default-x default-y) (hero-position (hero-load)))

(test-end "hero model")