// Utils informations
const KEYCODE_Q     = 81
const KEYCODE_ENTER = 13
const KEYCODE_LEFT_ARROW  = 37
const KEYCODE_RIGHT_ARROW = 39

urlParams = new URLSearchParams(window.location.search)

const scene    = urlParams.get('scene')
const expe     = urlParams.get('expe')
var example    = urlParams.get('example')

if (example === null || example === ''){
     example = 0
}

const checkKey = e => {
     if (e.keyCode === KEYCODE_Q) {
          // `q` to quit expe
          console.log('`q` key is pressed')
          window.location = ''
     }
     else if (e.keyCode === KEYCODE_ENTER) {
          // right arrow
          const experimentId = document.getElementsByName('experimentId')[0].value
          const params = `?scene=${scene}&expe=${expe}&experimentId=${experimentId}&iteration=0`
          console.log(expeUrl + params)
          window.location = expeUrl + params
     }
     else if (e.keyCode === KEYCODE_LEFT_ARROW || e.keyCode === KEYCODE_RIGHT_ARROW) {
          
          // increment number of example
          example = parseInt(example) + 1

          console.log("I'm here")
          // construct url with params for experiments
          const params = `?scene=${scene}&expe=${expe}&example=${example}`
          window.location = indicationsUrl + params
     }
}

// implement `key` events
document.addEventListener('keydown', checkKey)