import {CanonicalStatic} from './CanonicalStatic'
import {Singleton, Instantiable, StaticClass} from '../di'
import {Controller} from '../http/Controller'
import {CanonicalDefinition} from './Canonical'

/**
 * A canonical unit that loads the controller classes from `app/http/controllers`.
 */
@Singleton()
export class Controllers extends CanonicalStatic<Instantiable<Controller>, Controller> {
    protected appPath = ['http', 'controllers']

    protected canonicalItem = 'controller'

    protected suffix = '.controller'

    public async initCanonicalItem(definition: CanonicalDefinition): Promise<StaticClass<Instantiable<Controller>, Controller>> {
        const item = await super.initCanonicalItem(definition)
        if ( !(item.prototype instanceof Controller) ) {
            throw new TypeError(`Invalid controller definition: ${definition.originalName}. Controllers must extend from @extollo/lib.http.Controller.`)
        }

        return item
    }
}