import {Canonical, CanonicalDefinition} from './Canonical.ts'
import {isRouterDefinition, RouterDefinition} from '../http/type/RouterDefinition.ts'
import {Unit} from '../lifecycle/decorators.ts'

/**
 * Canonical unit which loads router definitions.
 * @extends Canonical
 */
@Unit()
export default class Routes extends Canonical<RouterDefinition> {
    protected base_path = './app/http/routes'
    protected canonical_item = 'route_group'
    protected suffix = '.routes.ts'

    public async init_canonical_item(def: CanonicalDefinition): Promise<RouterDefinition> {
        const item = await super.init_canonical_item(def)
        if ( !isRouterDefinition(item) ) {
            throw new TypeError(`Invalid routes definition: ${def.original_name}.`)
        }
        return item
    }
}