import * as EmailValidator from 'email-validator'
import logger from 'log'
import zxcvbn from 'zxcvbn'
import {parseDocument} from 'htmlparser2'

let _verbose: boolean = false
export function verbose(v: boolean) {
    _verbose = v
}

const log = logger('validation')

export enum PasswordStrength {
    Weak = 0,
    Easy = 1,
    Medium = 2,
    Strong = 3,
    Hard = 4,
}

export function password_is_strong(password: string, strength: PasswordStrength = PasswordStrength.Medium, email?: string) : boolean {
    log.trace("Verify password's strength")

    if (zxcvbn(password, email !== undefined ? [email] : []).score < strength) {
        if (_verbose) log.warn("Password is too weak")
        return false
    }

    return true
}

export function contains_html(text: string) : boolean {
    log.trace("Verify if text contains HTML")

    if (parseDocument(text).children.some(node => node.nodeType === 1)) {
        if (_verbose) log.warn("")
        return true
    }

    return false
}

export function email_is_valid(email: string) : boolean {
    log.trace("Verify email's validity")

    if (!EmailValidator.validate(email)) {
        if (_verbose) log.warn("Invalid email")
        return false
    }

    return true
}