import { describe, it, expect, beforeEach } from 'vitest'
import {
  cacheKey, getCachedForecast, setCachedForecast, clearForecastCache, TTL_MS,
} from '../../../src/lib/stores/forecast-cache.js'

describe('forecast cache', () => {
  beforeEach(() => clearForecastCache())

  it('builds a stable key from coords/source/units', () => {
    expect(cacheKey({ lat: 36.35, lon: -95.81 }, 'open-meteo', 'metric'))
      .toBe('36.35,-95.81|open-meteo|metric')
  })

  it('returns data within TTL', () => {
    const now = 1_000_000
    setCachedForecast('k', { hi: 1 }, now)
    expect(getCachedForecast('k', now + TTL_MS - 1)).toEqual({ hi: 1 })
  })

  it('expires and deletes after TTL', () => {
    const now = 1_000_000
    setCachedForecast('k', { hi: 1 }, now)
    expect(getCachedForecast('k', now + TTL_MS + 1)).toBeNull()
    expect(getCachedForecast('k', now + TTL_MS + 2)).toBeNull()
  })

  it('misses on unknown key', () => {
    expect(getCachedForecast('nope')).toBeNull()
  })
})