import { resolveDate } from './date.ts'
import { buildWeatherResponse } from './format.ts'
import { fetchWeatherData } from './open-meteo.ts'
import { resolveWeatherLocation } from './weather-geocode.ts'

export type WeatherLookupParams = {
	location?: string
	latitude?: number
	longitude?: number
	label?: string
	date?: string
	hour?: number | null
	hourlyLimit?: number
	units?: 'metric' | 'imperial'
}

/** Daily/hourly weather lookup with cached fallback when live Open-Meteo is degraded. */
export async function weatherLookup(params: WeatherLookupParams = {}) {
	const input = typeof params === 'object' && params ? params : {}
	const units = input.units === 'metric' ? 'metric' : 'imperial'
	const date = resolveDate(input.date, new Date())
	const hour =
		input.hour === null || input.hour === undefined ? null : Number(input.hour)
	const resolvedLocation = await resolveWeatherLocation(input)
	const weather = await fetchWeatherData({
		latitude: resolvedLocation.latitude,
		longitude: resolvedLocation.longitude,
		date,
		units,
	})
	return buildWeatherResponse({
		data: weather.data,
		date,
		displayName: resolvedLocation.displayName,
		latitude: resolvedLocation.latitude,
		longitude: resolvedLocation.longitude,
		locationSource: resolvedLocation.source,
		hour,
		hourlyLimit: input.hourlyLimit,
		units,
		isHistorical: weather.isHistorical,
		isForecast: weather.isForecast,
		source: weather.source,
		stale: weather.stale,
		attempts: weather.attempts,
		recordedAt: weather.recordedAt,
		fallbackError: weather.fallbackError,
	})
}

export default weatherLookup