import tap from 'tap'
import isRoughlyEqual from 'is-roughly-equal'
import maxBy from 'lodash/maxBy.js'
import flatMap from 'lodash/flatMap.js'
import last from 'lodash/last.js'

import {createWhen} from './lib/util.js'
import {createClient} from '../../index.js'
import {profile as dbProfile} from '../../p/db/index.js'
import {
    createValidateStation,
	createValidateTrip
} from './lib/validators.js'
import {createValidateFptfWith as createValidate} from './lib/validate-fptf-with.js'
import {testJourneysStationToStation} from './lib/journeys-station-to-station.js'
import {testJourneysStationToAddress} from './lib/journeys-station-to-address.js'
import {testJourneysStationToPoi} from './lib/journeys-station-to-poi.js'
import {testEarlierLaterJourneys} from './lib/earlier-later-journeys.js'
import {testLegCycleAlternatives} from './lib/leg-cycle-alternatives.js'
import {testRefreshJourney} from './lib/refresh-journey.js'
import {journeysFailsWithNoProduct} from './lib/journeys-fails-with-no-product.js'
import {testDepartures} from './lib/departures.js'
import {testDeparturesInDirection} from './lib/departures-in-direction.js'
import {testArrivals} from './lib/arrivals.js'
import {testJourneysWithDetour} from './lib/journeys-with-detour.js'
import {testReachableFrom} from './lib/reachable-from.js'
import {testServerInfo} from './lib/server-info.js'

const isObj = o => o !== null && 'object' === typeof o && !Array.isArray(o)
const minute = 60 * 1000

const T_MOCK = 1668495600 * 1000 // 2022-11-15T08:00:00+01:00
const when = createWhen(dbProfile.timezone, dbProfile.locale, T_MOCK)

const cfg = {
	when,
	stationCoordsOptional: false,
	products: dbProfile.products,
	minLatitude: 46.673100,
	maxLatitude: 55.030671,
	minLongitude: 6.896517,
	maxLongitude: 16.180237
}

const validate = createValidate(cfg)

const assertValidPrice = (t, p) => {
	t.ok(p)
	if (p.amount !== null) {
		t.equal(typeof p.amount, 'number')
		t.ok(p.amount > 0)
	}
	if (p.hint !== null) {
		t.equal(typeof p.hint, 'string')
		t.ok(p.hint)
	}
}

const client = createClient(dbProfile, 'public-transport/hafas-client:test')

const berlinHbf = '8011160'
const münchenHbf = '8000261'
const jungfernheide = '8011167'
const blnSchwedterStr = '732652'
const westhafen = '8089116'
const wedding = '8089131'
const württembergallee = '731084'
const regensburgHbf = '8000309'
const blnOstbahnhof = '8010255'
const blnTiergarten = '8089091'
const blnJannowitzbrücke = '8089019'
const potsdamHbf = '8012666'
const berlinSüdkreuz = '8011113'
const kölnHbf = '8000207'

tap.test('journeys – Berlin Schwedter Str. to München Hbf', async (t) => {
	const res = await client.journeys(blnSchwedterStr, münchenHbf, {
		results: 4,
		departure: when,
		stopovers: true
	})

	await testJourneysStationToStation({
		test: t,
		res,
		validate,
		fromId: blnSchwedterStr,
		toId: münchenHbf
	})
	// todo: find a journey where there pricing info is always available
	for (let journey of res.journeys) {
		if (journey.price) assertValidPrice(t, journey.price)
	}

	t.end()
})

// todo: journeys, only one product

tap.test('journeys – fails with no product', async (t) => {
	await journeysFailsWithNoProduct({
		test: t,
		fetchJourneys: client.journeys,
		fromId: blnSchwedterStr,
		toId: münchenHbf,
		when,
		products: dbProfile.products,
	})
	t.end()
})

tap.test('Berlin Schwedter Str. to Torfstraße 17', async (t) => {
	const torfstr = {
		type: 'location',
		address: 'Torfstraße 17',
		latitude: 52.5416823,
		longitude: 13.3491223
	}
	const res = await client.journeys(blnSchwedterStr, torfstr, {
		results: 3,
		departure: when
	})

	await testJourneysStationToAddress({
		test: t,
		res,
		validate,
		fromId: blnSchwedterStr,
		to: torfstr
	})
	t.end()
})

tap.test('Berlin Schwedter Str. to ATZE Musiktheater', async (t) => {
	const atze = {
		type: 'location',
		id: '991598902',
		poi: true,
		name: 'Berlin, Atze Musiktheater für Kinder (Kultur und U',
		latitude: 52.542417,
		longitude: 13.350437
	}
	const res = await client.journeys(blnSchwedterStr, atze, {
		results: 3,
		departure: when
	})

	await testJourneysStationToPoi({
		test: t,
		res,
		validate,
		fromId: blnSchwedterStr,
		to: atze
	})
	t.end()
})

tap.test('journeys: via works – with detour', async (t) => {
	// Going from Westhafen to Wedding via Württembergalle without detour
	// is currently impossible. We check if the routing engine computes a detour.
	const res = await client.journeys(westhafen, wedding, {
		via: württembergallee,
		results: 1,
		departure: when,
		stopovers: true
	})

	await testJourneysWithDetour({
		test: t,
		res,
		validate,
		detourIds: [württembergallee]
	})
	t.end()
})

// todo: walkingSpeed "Berlin - Charlottenburg, Hallerstraße" -> jungfernheide
// todo: without detour

// todo: with the DB endpoint, earlierRef/laterRef is missing queries many days in the future
tap.skip('earlier/later journeys, Jungfernheide -> München Hbf', async (t) => {
	await testEarlierLaterJourneys({
		test: t,
		fetchJourneys: client.journeys,
		validate,
		fromId: jungfernheide,
		toId: münchenHbf,
		when,
	})

	t.end()
})

if (!process.env.VCR_MODE) {
	tap.test('journeys – leg cycle & alternatives', async (t) => {
		await testLegCycleAlternatives({
			test: t,
			fetchJourneys: client.journeys,
			fromId: blnTiergarten,
			toId: blnJannowitzbrücke,
			when,
		})
		t.end()
	})
}

tap.test('refreshJourney', async (t) => {
	await testRefreshJourney({
		test: t,
		fetchJourneys: client.journeys,
		refreshJourney: client.refreshJourney,
		validate,
		fromId: jungfernheide,
		toId: münchenHbf,
		when
	})
	t.end()
})

tap.skip('journeysFromTrip – U Mehringdamm to U Naturkundemuseum, reroute to Spittelmarkt.', async (t) => {
	const blnMehringdamm = '730939'
	const blnStadtmitte = '732541'
	const blnNaturkundemuseum = '732539'
	const blnSpittelmarkt = '732543'

	const isU6Leg = leg => (
		leg.line && leg.line.name
		&& leg.line.name.toUpperCase().replace(/\s+/g, '') === 'U6'
	)
	const sameStopOrStation = (stopA) => (stopB) => {
		if (stopA.id && stopB.id && stopA.id === stopB.id) return true
		const statA = stopA.stat && stopA.stat.id || NaN
		const statB = stopB.stat && stopB.stat.id || NaN
		return (statA === statB || stopA.id === statB || stopB.id === statA)
	}
	const departureOf = st => +new Date(st.departure || st.scheduledDeparture)
	const arrivalOf = st => +new Date(st.arrival || st.scheduledArrival)

	// `journeysFromTrip` only supports queries *right now*, so we can't use `when` as in all
	// other tests. To make the test less brittle, we pick a connection that is served all night. 🙄
	const when = new Date()
	const validate = createValidate({...cfg, when})

	const findTripBetween = async (stopAId, stopBId, products = {}) => {
		const {journeys} = await client.journeys(stopAId, stopBId, {
			departure: new Date(when - 10 * minute),
			transfers: 0, products,
			results: 8, stopovers: false, remarks: false,
		})
		for (const j of journeys) {
			const l = j.legs.find(isU6Leg)
			if (!l) continue
			const t = await client.trip(l.tripId, {
				stopovers: true, remarks: false
			})

			const pastStopovers = t.stopovers
			.filter(st => departureOf(st) < Date.now()) // todo: <= ?
			const hasStoppedAtA = pastStopovers
			.find(sameStopOrStation({id: stopAId}))
			const willStopAtB = t.stopovers
			.filter(st => arrivalOf(st) > Date.now()) // todo: >= ?
			.find(sameStopOrStation({id: stopBId}))

			if (hasStoppedAtA && willStopAtB) {
				const prevStopover = maxBy(pastStopovers, departureOf)
				return {trip: t, prevStopover}
			}
		}
		return {trip: null, prevStopover: null}
	}

	// Find a vehicle from U Mehringdamm to U Stadtmitte (to the north) that is currently
	// between these two stations.
	const {trip, prevStopover} = await findTripBetween(blnMehringdamm, blnStadtmitte, {
		regionalExpress: false, regional: false, suburban: false
	})
	t.ok(trip, 'precondition failed: trip not found')
	t.ok(prevStopover, 'precondition failed: previous stopover missing')

	// todo: "Error: Suche aus dem Zug: Vor Abfahrt des Zuges"
	const newJourneys = await client.journeysFromTrip(trip.id, prevStopover, blnSpittelmarkt, {
		results: 3, stopovers: true, remarks: false
	})

	// Validate with fake prices.
	const withFakePrice = (j) => {
		const clone = Object.assign({}, j)
		clone.price = {amount: 123, currency: 'EUR'}
		return clone
	}
	// todo: there is no such validator!
	validate(t, newJourneys.map(withFakePrice), 'journeysFromTrip', 'newJourneys')

	for (let i = 0; i < newJourneys.length; i++) {
		const j = newJourneys[i]
		const n = `newJourneys[${i}]`

		const legOnTrip = j.legs.find(l => l.tripId === trip.id)
		t.ok(legOnTrip, n + ': leg with trip ID not found')
		t.equal(last(legOnTrip.stopovers).stop.id, blnStadtmitte)
	}
})

tap.test('trip details', async (t) => {
	const res = await client.journeys(berlinHbf, münchenHbf, {
		results: 1, departure: when
	})

	const p = res.journeys[0].legs.find(l => !l.walking)
	t.ok(p.tripId, 'precondition failed')
	t.ok(p.line.name, 'precondition failed')

	const tripRes = await client.trip(p.tripId, {when})

	const validate = createValidate(cfg, {
		trip: (cfg) => {
			const validateTrip = createValidateTrip(cfg)
			const validateTripWithFakeDirection = (val, trip, name) => {
				validateTrip(val, {
					...trip,
					direction: trip.direction || 'foo', // todo, see #49
				}, name)
			}
			return validateTripWithFakeDirection
		}
	})
	validate(t, tripRes, 'tripResult', 'tripRes')

	t.end()
})

tap.test('departures at Berlin Schwedter Str.', async (t) => {
	const res = await client.departures(blnSchwedterStr, {
		duration: 5, when,
	})

	await testDepartures({
		test: t,
		res,
		validate,
		id: blnSchwedterStr
	})
	t.end()
})

tap.test('departures with station object', async (t) => {
	const res = await client.departures({
		type: 'station',
		id: jungfernheide,
		name: 'Berlin Jungfernheide',
		location: {
			type: 'location',
			latitude: 1.23,
			longitude: 2.34
		}
	}, {when})

	validate(t, res, 'departuresResponse', 'res')
	t.end()
})

tap.test('departures at Berlin Hbf in direction of Berlin Ostbahnhof', async (t) => {
	await testDeparturesInDirection({
		test: t,
		fetchDepartures: client.departures,
		fetchTrip: client.trip,
		id: berlinHbf,
		directionIds: [blnOstbahnhof, '8089185', '732676'],
		when,
		validate
	})
	t.end()
})

tap.test('arrivals at Berlin Schwedter Str.', async (t) => {
	const res = await client.arrivals(blnSchwedterStr, {
		duration: 5, when,
	})

	await testArrivals({
		test: t,
		res,
		validate,
		id: blnSchwedterStr
	})
	t.end()
})

tap.test('nearby Berlin Jungfernheide', async (t) => {
	const nearby = await client.nearby({
		type: 'location',
		latitude: 52.530273,
		longitude: 13.299433
	}, {
		results: 2, distance: 400
	})

	validate(t, nearby, 'locations', 'nearby')

	t.equal(nearby.length, 2)

	const s0 = nearby[0]
	t.equal(s0.id, jungfernheide)
	t.equal(s0.name, 'Berlin Jungfernheide')
	t.ok(isRoughlyEqual(.0005, s0.location.latitude, 52.530408))
	t.ok(isRoughlyEqual(.0005, s0.location.longitude, 13.299424))
	t.ok(s0.distance >= 0)
	t.ok(s0.distance <= 100)

	t.end()
})

tap.test('locations named Jungfernheide', async (t) => {
	const locations = await client.locations('Jungfernheide', {
		results: 10
	})

	validate(t, locations, 'locations', 'locations')
	t.ok(locations.length <= 10)
	t.ok(locations.some((l) => {
		return l.station && l.station.id === jungfernheide || l.id === jungfernheide
	}), 'Jungfernheide not found')

	t.end()
})

tap.test('stop', async (t) => {
	const s = await client.stop(regensburgHbf)

	validate(t, s, ['stop', 'station'], 'stop')
	t.equal(s.id, regensburgHbf)

	t.end()
})

tap.test('line with additionalName', async (t) => {
	const {departures} = await client.departures(potsdamHbf, {
		when,
		duration: 12 * 60, // 12 minutes
		products: {bus: false, suburban: false, tram: false}
	})
	t.ok(departures.some(d => d.line && d.line.additionalName))
	t.end()
})

tap.test('radar', async (t) => {
	const res = await client.radar({
		north: 52.52411,
		west: 13.41002,
		south: 52.51942,
		east: 13.41709
	}, {
		duration: 5 * 60, when
	})

	validate(t, res, 'radarResult', 'res')
	t.end()
})

tap.test('reachableFrom', {timeout: 20 * 1000}, async (t) => {
	const torfstr17 = {
		type: 'location',
		address: 'Torfstraße 17',
		latitude: 52.5416823,
		longitude: 13.3491223
	}

	await testReachableFrom({
		test: t,
		reachableFrom: client.reachableFrom,
		address: torfstr17,
		when,
		maxDuration: 15,
		validate
	})
	t.end()
})

tap.test('serverInfo works', async (t) => {
	await testServerInfo({
		test: t,
		fetchServerInfo: client.serverInfo,
	})
})