export const getBostonAreaWeather = functions.https.onRequest((request, response) => {
    admin.firestore().doc("areas/greater-boston").get()
    .then(areaSnapshot => {
        const cities = areaSnapshot.data().cities
        const promises = []
        cities.forEach(city => {
            const p = admin.firestore().doc(`cities-weather/${city}`).get()
            promises.push(p)
        })
        return Promise.all(promises)
    })
    .then(snapshots => {
        const results = []
        snapshots.forEach(snap => {
            const data = snap.data()
            data.city = snap.id
            results.push(data)
        })
        response.send(results)
    })
    .catch(error => {
        console.log(error)
        response.status(500).send(error)
    })
})