import { describe, it, expect } from 'vitest'
import { readFileSync } from 'node:fs'
import path from 'node:path'
import {
  compassToDeg,
  parseWind,
  shortForecastToWmo,
  dateKey,
  localTimeString,
  normalizeNWS,
} from '../src/lib/api/nws.js'

const FIX = (name) => JSON.parse(readFileSync(path.join('tests/fixtures/nws', name), 'utf8'))

describe('nws helpers', () => {
  it('shortForecastToWmo maps text to WMO codes', () => {
    expect(shortForecastToWmo('Sunny')).toBe(0)
    expect(shortForecastToWmo('Mostly Sunny')).toBe(2)
    expect(shortForecastToWmo('Partly Cloudy')).toBe(2)
    expect(shortForecastToWmo('Overcast')).toBe(3)
    expect(shortForecastToWmo('Slight Chance Showers And Thunderstorms')).toBe(95)
    expect(shortForecastToWmo('Heavy Rain')).toBe(65)
    expect(shortForecastToWmo('Light Snow')).toBe(71)
    expect(shortForecastToWmo('Areas of Fog')).toBe(45)
  })

  it('compassToDeg maps compass points to degrees', () => {
    expect(compassToDeg('N')).toBe(0)
    expect(compassToDeg('NE')).toBe(45)
    expect(compassToDeg('SW')).toBe(225)
    expect(compassToDeg('W')).toBe(270)
    expect(compassToDeg(null)).toBeNull()
  })

  it('parseWind takes the max speed from a range string', () => {
    expect(parseWind('5 to 10 mph')).toBe(10)
    expect(parseWind('12 mph')).toBe(12)
    expect(parseWind('gusts up to 20 mph')).toBe(20)
    expect(parseWind(null)).toBeNull()
  })

  it('dateKey and localTimeString produce naive local times (no UTC shift)', () => {
    const tz = 'America/Chicago'
    expect(dateKey('2026-08-16T15:00:00-05:00', tz)).toBe('2026-08-16')
    expect(localTimeString('2026-08-16T15:00:00-05:00', tz)).toBe('2026-08-16T15:00')
    expect(localTimeString('2026-08-19T15:00:00-05:00', tz)).toMatch(/^2026-08-19T/)
  })
})

describe('normalizeNWS (recorded live fixture for Rogers County, OK)', () => {
  const points = FIX('points.json')
  const forecast = FIX('forecast.json')
  const hourly = FIX('hourly.json')
  const grid = FIX('grid.json')
  const timeZone = points.properties.timeZone

  const data = normalizeNWS({ points, forecast, hourly, grid, timeZone, units: 'imperial' })

  it('marks the source as nws', () => {
    expect(data._source).toBe('nws')
  })

  it('normalizes air high (not heat index) for the 7-day, matching NWS values', () => {
    // NWS daytime highs: Today 103, Mon 94, Wed 104 ... (NO 116 outlier)
    expect(data.daily.time).toHaveLength(7)
    expect(data.daily.temperature_2m_max[0]).toBe(103) // Today
    expect(data.daily.temperature_2m_max[1]).toBe(94) // Monday
    expect(data.daily.temperature_2m_max[3]).toBe(104) // Wednesday
    expect(Math.max(...data.daily.temperature_2m_max)).toBeLessThan(115)
    expect(data.daily.temperature_2m_min[0]).toBe(75)
    expect(data.daily.precipitation_probability_max[0]).toBe(24)
  })

  it('builds a realistic current from the first hourly period', () => {
    expect(data.current.temperature_2m).toBe(102)
    expect(data.current.relative_humidity_2m).toBe(35)
    expect(data.current.wind_direction_10m).toBe(225) // SW
    expect(data.current.time).toMatch(/^\d{4}-\d{2}-\d{2}T\d{2}:\d{2}$/)
  })

  it('normalizes to metric on request', () => {
    const m = normalizeNWS({ points, forecast, hourly, grid, timeZone, units: 'metric' })
    expect(m.current.temperature_2m).toBeCloseTo((102 - 32) * 5 / 9, 1)
    expect(m.daily.temperature_2m_max[0]).toBeCloseTo((103 - 32) * 5 / 9, 1)
    expect(m.current.wind_speed_10m).toBeCloseTo(10 * 1.609344, 1)
  })
})