import {Instantiable, isInstantiable} from '../di'
import {AuthenticatableRepository} from './types'
import {hasOwnProperty} from '../util'
import {LoginProvider, LoginProviderConfig} from './provider/LoginProvider'
import {Middleware} from '../http/routing/Middleware'

export interface AuthenticationConfig {
    storage: Instantiable<AuthenticatableRepository>,
    middleware?: Instantiable<Middleware>,
    providers?: {
        [key: string]: {
            driver: Instantiable<LoginProvider<LoginProviderConfig>>,
            config: LoginProviderConfig,
        },
    },
}

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

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

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

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

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

        const source = what.providers[key]
        if ( typeof source !== 'object' || source === null || !hasOwnProperty(source, 'driver') ) {
            return false
        }

        if ( !isInstantiable(source.driver) || !(source.driver.prototype instanceof LoginProvider) ) {
            return false
        }
    }

    return true
}