import { describe, expect, it } from 'vitest'
import { estimateTrainTrip } from '../../server/utils/estimate'

describe('estimateTrainTrip', () => {
  const grenoble = { lat: 45.1885, lon: 5.7245 }
  const marseille = { lat: 43.2965, lon: 5.3698 }
  const lille = { lat: 50.6292, lon: 3.0573 }
  const paris = { lat: 48.8566, lon: 2.3522 }

  it('renvoie un objet marque comme estime', () => {
    const trip = estimateTrainTrip(grenoble, marseille)
    expect(trip.estimated).toBe(true)
    expect(trip.mode).toBe('train')
  })

  it('estime Grenoble-Marseille (vol oiseau 216 km, ferroviaire ~260 km)', () => {
    const trip = estimateTrainTrip(grenoble, marseille)
    expect(trip.distanceKm).toBeGreaterThan(230)
    expect(trip.distanceKm).toBeLessThan(290)
    // A 90 km/h : entre 2h30 et 3h20 environ
    expect(trip.durationMin).toBeGreaterThan(150)
    expect(trip.durationMin).toBeLessThan(200)
  })

  it('estime Lille-Paris (vol oiseau 203 km, ferroviaire ~245 km)', () => {
    const trip = estimateTrainTrip(lille, paris)
    expect(trip.distanceKm).toBeGreaterThan(220)
    expect(trip.distanceKm).toBeLessThan(280)
  })

  it('renvoie une geometrie a deux points', () => {
    const trip = estimateTrainTrip(grenoble, marseille)
    expect(trip.geometry).toHaveLength(2)
    expect(trip.geometry[0]).toEqual([grenoble.lon, grenoble.lat])
    expect(trip.geometry[1]).toEqual([marseille.lon, marseille.lat])
  })

  it('calcule le CO2 avec le facteur ADEME train (2.4 g/km)', () => {
    const trip = estimateTrainTrip(grenoble, marseille)
    expect(trip.co2Grams).toBeCloseTo(trip.distanceKm * 2.4, 0)
  })
})