;; 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)
  #:use-module (game model level)
  #:export (hero-load
            hero-state hero-with-state
            hero-bloat hero-with-bloat
            hero-position hero-with-position
            hero-x hero-with-x
            hero-y hero-with-y
            ))


(define-immutable-record-type <hero>
  (%make-hero position state bloat)
  hero?
  (position hero-position hero-with-position)
  (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-state 'stationary)
(define default-bloat 1.0)

(define (hero-load level)
  (let ((initial-position (level-find-hero level)))
    (%make-hero initial-position default-state default-bloat)))

(define (hero-x hero)
  (inexact->exact (floor (vec2-x (hero-position hero)))))
(define (hero-y hero)
  (inexact->exact (floor (vec2-y (hero-position hero)))))

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

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

;; Tests
[test-begin "hero model"]

(let* ((level (level-parse "WWWWW\nW...W\nW.P.W\nW...W\nWWWWW\n"))
       (hero (hero-load level))
       (default-position (level-find-hero level)))
  (test-assert (hero? hero))
  (test-equal default-position (hero-position hero))
  (test-equal default-state (hero-state hero))
  (test-equal default-bloat (hero-bloat hero))
  
  (test-equal (vec2 10 20)  (hero-position (hero-with-position hero (vec2 10 20))))
  (test-equal default-position (hero-position 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 16 (hero-x (hero-with-position hero (vec2 16.34 20.78))))
  (test-equal 20 (hero-y (hero-with-position hero (vec2 16.34 20.78))))
  )

(test-end "hero model")