import { store } from '../api_deps.js'
import { stateAwait } from './utils/stateAwait.js'
import { Sha512 } from 'asmcrypto.js'
import utils from '../api/deps/utils.js'

export const kdf = async (seed, salt, status = () => { }) => {
	const state = store.getState()
	const config = state.config
	const workers = state.app.workers.workers
	status('Waiting for workers to be ready')
	await stateAwait(state => state.app.workers.ready)
	status('Deriving key parts')
	salt = new Uint8Array(salt)
	const seedParts = await Promise.all(workers.map((worker, index) => {
		const nonce = index
		return worker.request('kdf', {
			key: seed,
			salt,
			nonce,
			staticSalt: config.crypto.staticSalt,
			staticBcryptSalt: config.crypto.staticBcryptSalt
		}).then(data => {
			let jsonData
			try {
				jsonData = JSON.parse(data)
				data = jsonData
			} catch (e) {
				// ...
			}
			if (seed !== data.key) throw new Error('Error, incorrect key. ' + seed + ' !== ' + data.key)
			if (nonce !== data.nonce) throw new Error('Error, incorrect nonce')
			return data.result
		})
	}))
	status('Combining key parts')
	const result = new Sha512().process(utils.stringtoUTF8Array(config.crypto.staticSalt + seedParts.reduce((a, c) => a + c))).finish().result
	status('Key is ready ')
	return result
}