functions.ts

import {ColorRange} from '@/lib/types'

/**
 * Convert UNIX time into human readable format.
 *
 * @see https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Intl/DateTimeFormat
 */
export function formatDate(time: number, timezone: string): string {
  const date = new Date(time * 1000)
  const options: Intl.DateTimeFormatOptions = {
    dateStyle: 'full',
    timeStyle: 'long',
    timeZone: timezone
  }
  return new Intl.DateTimeFormat('en-US', options).format(date)
}

/**
 * Convert the temperature from Fahrenheit to Celsius.
 */
export function fahrenheitToCelsius(fahrenheit: number): number {
  return (fahrenheit - 32) / 1.8
}

/**
 * Format the speed in either miles per hour or kilometers per hour.
 */
export function formatSpeed(speed: number, unit: string): string {
  const speedFormat = unit === 'imperial' ? speed : speed * 1.609344
  return new Intl.NumberFormat('en-US', {
    style: 'unit',
    unit: unit === 'imperial' ? 'mile-per-hour' : 'kilometer-per-hour'
  }).format(Math.round(speedFormat))
}

/**
 * Format the distance in either miles or kilometers.
 */
export function formatDistance(distance: number, unit: string): string {
  const distanceFormat = unit === 'imperial' ? distance : distance * 1.609344
  return new Intl.NumberFormat('en-US', {
    style: 'unit',
    unit: unit === 'imperial' ? 'mile' : 'kilometer'
  }).format(Math.round(distanceFormat))
}

/**
 * Format the temperature in either Fahrenheit or Celsius.
 *
 * @see https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Intl/NumberFormat
 */
export function formatTemp(temp: number, unit: string): string {
  const temperature = unit === 'imperial' ? temp : fahrenheitToCelsius(temp)

  return new Intl.NumberFormat('en-US', {
    style: 'unit',
    unit: unit === 'imperial' ? 'fahrenheit' : 'celsius'
  }).format(Math.round(temperature))
}

/**
 * Get the color for the temperature.
 */
export function getTempColor(temp: number): string {
  const temperature = Math.min(temp, 105)
  const colorRange = colorRanges.find(
    (range) => temperature >= range.minTemp && temperature < range.maxTemp
  )

  return colorRange?.color ?? 'rgb(255, 255, 255)'
}

/**
 * Convert Fahrenheit into an RGB color.
 */
const colorRanges: ColorRange[] = [
  {minTemp: -100, maxTemp: -20, color: 'rgb(55, 0, 55)'},
  {minTemp: -20, maxTemp: -15, color: 'rgb(88, 0, 88)'},
  {minTemp: -15, maxTemp: -10, color: 'rgb(144, 0, 144)'},
  {minTemp: -10, maxTemp: -5, color: 'rgb(192, 0, 192)'},
  {minTemp: -5, maxTemp: 0, color: 'rgb(240, 0, 240)'},
  {minTemp: 0, maxTemp: 5, color: 'rgb(176, 0, 240)'},
  {minTemp: 5, maxTemp: 10, color: 'rgb(94, 0, 240)'},
  {minTemp: 10, maxTemp: 15, color: 'rgb(0, 0, 240)'},
  {minTemp: 15, maxTemp: 20, color: 'rgb(0, 84, 240)'},
  {minTemp: 20, maxTemp: 25, color: 'rgb(0, 132, 240)'},
  {minTemp: 25, maxTemp: 30, color: 'rgb(0, 184, 240)'},
  {minTemp: 30, maxTemp: 35, color: 'rgb(0, 248, 240)'},
  {minTemp: 35, maxTemp: 40, color: 'rgb(0, 224, 192)'},
  {minTemp: 40, maxTemp: 45, color: 'rgb(0, 196, 112)'},
  {minTemp: 45, maxTemp: 50, color: 'rgb(0, 172, 0)'},
  {minTemp: 50, maxTemp: 55, color: 'rgb(112, 196, 0)'},
  {minTemp: 55, maxTemp: 60, color: 'rgb(192, 224, 0)'},
  {minTemp: 60, maxTemp: 65, color: 'rgb(240, 248, 0)'},
  {minTemp: 65, maxTemp: 70, color: 'rgb(240, 196, 0)'},
  {minTemp: 70, maxTemp: 75, color: 'rgb(240, 148, 0)'},
  {minTemp: 75, maxTemp: 80, color: 'rgb(240, 96, 0)'},
  {minTemp: 80, maxTemp: 85, color: 'rgb(240, 0, 0)'},
  {minTemp: 85, maxTemp: 90, color: 'rgb(192, 0, 0)'},
  {minTemp: 90, maxTemp: 95, color: 'rgb(144, 0, 0)'},
  {minTemp: 95, maxTemp: 100, color: 'rgb(88, 0, 0)'},
  {minTemp: 100, maxTemp: 150, color: 'rgb(255, 255, 255)'}
].sort((a, b) => a.minTemp - b.minTemp)