import { ZOOM_STEPS } from './constants'
import { clamp } from '../../util'

export const positionToTime = (y, { start_ts, zoom, duration }) => {
  const secondsPerPixel = ZOOM_STEPS[zoom] * 0.1
  const widthTimeDuration = window.innerHeight * secondsPerPixel
  const timeMin = start_ts
  const timeMax = Math.min(start_ts + widthTimeDuration, duration)
  const timeWidth = timeMax - timeMin
  return clamp(y * secondsPerPixel + start_ts, 0, timeMax)
}

export const timeToPosition = (ts, { start_ts, zoom, duration }) => {
  const height = window.innerHeight
  const secondsPerPixel = ZOOM_STEPS[zoom] * 0.1
  const widthTimeDuration = height * secondsPerPixel
  const timeMin = start_ts
  const timeMax = Math.min(start_ts + widthTimeDuration, duration)
  const timeWidth = timeMax - timeMin
  const timeHalfHeight = height * secondsPerPixel / 2
  if (ts < timeMin - timeHalfHeight) {
    return -9999
  }
  if (ts > timeMax) {
    return -9999
  }
  return (ts - timeMin) / timeWidth * height
}