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import { calibrate } from './fuel'
import { arm } from './time'

type Reading = {
  fuelVariance: number
  targetVariance: number
  fieldVariance: number
  velocityMph: number
}

const IGNITION_GW = 1.21
const MAX_DRIFT = 0.03
const JUMP_SPEED = 88

export function stabilize(r: Reading) {
  const fuelDrift = r.fuelVariance - r.targetVariance
  const fieldError = Math.abs(r.fieldVariance)

  // Keep the field inside the safe temporal envelope.
  const cell = calibrate({
    targetGigawatts: IGNITION_GW,
    variance: fuelDrift,
  })

  if (r.velocityMph < JUMP_SPEED) {
    return {
      status: 'charging',
      cell,
    }
  }

  const unstable =
    fuelDrift > MAX_DRIFT ||
    fieldError > MAX_DRIFT

  if (unstable) {
    return {
      status: 'recalibrating',
      cell,
    }
  }

  return arm({
    loadGigawatts: IGNITION_GW,
    velocityMph: r.velocityMph,
  })
}