import { computed, reactive } from 'vue'
import { RECIPROCAL, STAGE_WIDTH, STAGE_HEIGHT } from '../level/def'

const player: Player = reactive({
  x: Math.round((STAGE_WIDTH + 2) / 2),
  y: Math.round((STAGE_HEIGHT + 2) / 2),
  lastDir: 0,
  vx: 0,
  vy: 1, // always falling, because of gravity
  inventory: [], // not yet in use
})

export default function usePlayer() {
  const dx = computed(() => player.vx * RECIPROCAL)
  const dy = computed(() => player.vy * RECIPROCAL)
  const direction = computed(() => (player.lastDir < 0 ? 'left' : 'right'))

  return { player, direction, dx, dy }
}