import {PushedToQueue} from './PushedToQueue'
import {Queueable, SerialPayload, ShouldQueue} from '../../types'
import {PushingToQueue} from './PushingToQueue'
import {BaseSerializer} from '../../serial/BaseSerializer'
import {JSONState} from '../../../../util'
import {ObjectSerializer} from '../../serial/decorators'

export type QueueEvent = PushedToQueue<ShouldQueue<Queueable>> | PushingToQueue<ShouldQueue<Queueable>>

export interface QueueEventSerialPayload extends JSONState {
    eventName: '@extollo/lib.PushedToQueue' | '@extollo/lib.PushingToQueue'
    itemPayload: SerialPayload<Queueable, JSONState>
    queueName: string
}

@ObjectSerializer()
export class QueueEventSerializer extends BaseSerializer<QueueEvent, QueueEventSerialPayload> {
    protected async decodeSerial(serial: QueueEventSerialPayload): Promise<QueueEvent> {
        const item = await this.getSerialization().decode(serial.itemPayload)

        if ( serial.eventName === '@extollo/lib.PushedToQueue' ) {
            return new PushedToQueue(item as ShouldQueue<Queueable>, serial.queueName)
        } else {
            return new PushingToQueue(item as ShouldQueue<Queueable>, serial.queueName)
        }
    }

    protected async encodeActual(actual: QueueEvent): Promise<QueueEventSerialPayload> {
        return {
            eventName: actual.eventName,
            queueName: actual.queueName,
            itemPayload: await this.getSerialization().encode(actual.item),
        }
    }

    protected getName(): string {
        return '@extollo/lib.QueueEventSerializer'
    }

    matchActual(some: QueueEvent): boolean {
        return some instanceof PushedToQueue || some instanceof PushingToQueue
    }
}