import {
    AbstractFactory,
    Container,
    DependencyRequirement,
    PropertyDependency,
    isInstantiable,
    DEPENDENCY_KEYS_METADATA_KEY,
    DEPENDENCY_KEYS_PROPERTY_METADATA_KEY, Instantiable, FactoryProducer,
} from '../../../di'
import {Collection, ErrorWithContext} from '../../../util'
import {Config} from '../../../service/Config'
import {TokenRepository} from '../types'
import {ORMTokenRepository} from './ORMTokenRepository'

/**
 * A dependency injection factory that matches the abstract TokenRepository class
 * and produces an instance of the configured repository driver implementation.
 */
@FactoryProducer()
export class TokenRepositoryFactory extends AbstractFactory<TokenRepository> {
    protected get config(): Config {
        return Container.getContainer().make<Config>(Config)
    }

    produce(): TokenRepository {
        return new (this.getTokenRepositoryClass())()
    }

    match(something: unknown): boolean {
        return something === TokenRepository
    }

    getDependencyKeys(): Collection<DependencyRequirement> {
        const meta = Reflect.getMetadata(DEPENDENCY_KEYS_METADATA_KEY, this.getTokenRepositoryClass())
        if ( meta ) {
            return meta
        }
        return new Collection<DependencyRequirement>()
    }

    getInjectedProperties(): Collection<PropertyDependency> {
        const meta = new Collection<PropertyDependency>()
        let currentToken = this.getTokenRepositoryClass()

        do {
            const loadedMeta = Reflect.getMetadata(DEPENDENCY_KEYS_PROPERTY_METADATA_KEY, currentToken)
            if ( loadedMeta ) {
                meta.concat(loadedMeta)
            }
            currentToken = Object.getPrototypeOf(currentToken)
        } while (Object.getPrototypeOf(currentToken) !== Function.prototype && Object.getPrototypeOf(currentToken) !== Object.prototype)

        return meta
    }

    /**
     * Return the instantiable class of the configured token repository backend.
     * @protected
     * @return Instantiable<TokenRepository>
     */
    protected getTokenRepositoryClass(): Instantiable<TokenRepository> {
        const TokenRepositoryClass = this.config.get('oauth2.repository.token', ORMTokenRepository)

        if ( !isInstantiable(TokenRepositoryClass) || !(TokenRepositoryClass.prototype instanceof TokenRepository) ) {
            const e = new ErrorWithContext('Provided token repository class does not extend from @extollo/lib.TokenRepository')
            e.context = {
                configKey: 'oauth2.repository.client',
                class: TokenRepositoryClass.toString(),
            }
        }

        return TokenRepositoryClass
    }
}