import {CanonicalStatic} from './CanonicalStatic'
import {Singleton, Instantiable, StaticClass} from '../di'
import {CanonicalDefinition} from './Canonical'
import {Queueable} from '../support/queue/Queue'

/**
 * A canonical unit that resolves Queueable classes from `app/queueables`.
 */
@Singleton()
export class Queueables extends CanonicalStatic<Queueable, Instantiable<Queueable>> {
    protected appPath = ['queueables']

    protected canonicalItem = 'job'

    protected suffix = '.job.js'

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

        return item
    }
}