import {Instantiable, isInstantiable} from '../di'
import {AuthenticatableRepository} from './types'
import {hasOwnProperty} from '../util'

export interface AuthenticationConfig {
    storage: Instantiable<AuthenticatableRepository>,
    sources?: {
        [key: string]: Instantiable<AuthenticatableRepository>,
    },
}

export function isAuthenticationConfig(what: unknown): what is AuthenticationConfig {
    if ( typeof what !== 'object' || !what ) {
        return false
    }

    if ( !hasOwnProperty(what, 'storage') || !hasOwnProperty(what, 'sources') ) {
        return false
    }

    if ( !isInstantiable(what.storage) || !(what.storage.prototype instanceof AuthenticatableRepository) ) {
        return false
    }

    if ( typeof what.sources !== 'object' ) {
        return false
    }

    for ( const key in what.sources ) {
        if ( !hasOwnProperty(what.sources, key) ) {
            continue
        }

        const source = what.sources[key]
        if ( !isInstantiable(source) || !(source.prototype instanceof AuthenticatableRepository) ) {
            return false
        }
    }

    return true
}