store.js

import fetch from 'unfetch'

// Get the host from R4 or production or staging.
const getHost = () => {
	if (window && window.r4 && window.r4.databaseURL) {
		return window.r4.databaseURL
	}
	if (process.env.NODE_ENV === 'production') {
		return 'https://radio4000.firebaseio.com'
	}
	return 'https://radio4000-staging.firebaseio.com'
}
const host = getHost()

// Utilities for working with Firebase REST API.
const parse = res => {
	if (!res) return null
	return res.json().then(json => {
		if (!json) return null
		if (!Object.keys(json).length) throw new Error('404')
		return json
	})
}
const serializeId = (data, id) => {
	if (data) {
		return Object.assign(data, {id})
	}
}
const toArray = firebaseObj => {
	return Object.keys(firebaseObj).map(id => {
		return Object.assign(firebaseObj[id], {id})
	})
}
const getFirst = arr => arr[0]

export function findChannelBySlug(slug) {
	const url = `${host}/channels.json?orderBy="slug"&startAt="${slug}"&endAt="${slug}"`
	return fetch(url).then(parse).then(toArray).then(getFirst)
}

export function findChannelById(id) {
	const url = `${host}/channels/${id}.json`
	return fetch(url).then(parse).then(obj => serializeId(obj, id))
}

export function findChannelTracks(id) {
	const url = `${host}/tracks.json?orderBy="channel"&startAt="${id}"&endAt="${id}"`
	return fetch(url).then(parse).then(toArray).then(arr => {
		// Firebase queries through REST are not sorted.
		return arr.sort((a, b) => a.created - b.created)
	})
}

export function findTrack(id) {
	const url = `${host}/tracks/${id}.json`
	return fetch(url).then(parse).then(data => serializeId(data, id))
}

export function buildThumbnail(cloudinaryId) {
	return `https://res.cloudinary.com/radio4000/image/upload/w_250,h_250,q_60,c_thumb,fl_lossy/${cloudinaryId}`
}