import { given } from "@nivinjoseph/n-defensive";
import { EdaManager } from "../eda-manager.js";
import { Processor } from "./processor.js";
import { WorkItem } from "./scheduler.js";
import { ApplicationException } from "@nivinjoseph/n-exception";
import * as Axios from "axios";


export class RpcProxyProcessor extends Processor
{
    private readonly _rpcClient: Axios.AxiosInstance;


    public constructor(manager: EdaManager)
    {
        super(manager);

        given(manager, "manager").ensure(t => t.rpcProxyEnabled, "RPC proxy not enabled");

        this._rpcClient = Axios.default.create({
            timeout: 60000,
            baseURL: `http://${manager.rpcDetails!.host}:${manager.rpcDetails!.port}`
        });
    }


    protected async processEvent(workItem: WorkItem): Promise<void>
    {
        const response = await this._invokeRPC(workItem);

        if (response.status !== 200)
            throw new ApplicationException(
                `Error during invocation of RPC. Details => ${response.data ? JSON.stringify(response.data) : "Check logs for details."}`);

        const result = response.data;

        if (result.eventName !== workItem.eventName || result.eventId !== workItem.eventId)
            throw new ApplicationException(
                `Error during invocation of RPC. Details => ${result ? JSON.stringify(result) : "Check logs for details."}`);
    }

    private _invokeRPC(workItem: WorkItem): Promise<Axios.AxiosResponse<any>>
    {
        return this._rpcClient.post("/process" + `?event=${workItem.eventName}`, {
            consumerId: workItem.consumerId,
            topic: workItem.topic,
            partition: workItem.partition,
            eventName: workItem.eventName,
            payload: workItem.event.serialize()
        });
    }
}