import { cfg }       from './config.mjs'
import { writeFile, readFile, existsSync } from 'fs'
import { resolve, dirname } from 'path'
import { fileURLToPath }    from 'url'

const DIR        = dirname(fileURLToPath(import.meta.url))
const SHAPES_PATH = resolve(DIR, 'shapes.json')

export async function getShapes() {
	if (existsSync(SHAPES_PATH)) {
		return JSON.parse(await readFile(SHAPES_PATH, 'utf8'))
	}

	const r    = await fetch('https://raw.githubusercontent.com/wiedehopf/tar1090/master/html/markers.min.js')
	const text = await r.text()

	// tar1090 exposes a var with all the shape definitions
	let shapes = {}
	try {
		const match = text.match(/var\s+_aircraft_markers\s*=\s*(\{[\s\S]*?\});/)
		if (match) shapes = JSON.parse(match[1])
	} catch (e) {
		console.error('Failed to parse tar1090 shapes:', e)
	}

	writeFile(SHAPES_PATH, JSON.stringify(shapes), () => {})
	return shapes
}

export async function getAirTraffic() {
	const { ADSB_URL } = cfg()
	if (!ADSB_URL) return { data: [] }
	const r = await fetch(`${ADSB_URL}/re-api/?all`)
	const j = await r.json()
	return { data: j.aircraft || [] }
}

export async function getAirTrafficHistory(icao) {
	const { ADSB_URL } = cfg()
	if (!ADSB_URL) return { history: [] }
	const r = await fetch(`${ADSB_URL}/re-api/?trace&icao=${icao}`)
	const j = await r.json()
	const history = (j.trace || []).map(t => ({
		latitude:  t[1],
		longitude: t[2],
		altitude:  t[3] || 0,
	}))
	return { history }
}