const grpc = require("@grpc/grpc-js");
const PROTO_PATH = "../protos/serve_currenttime.proto";
const protoLoader = require("@grpc/proto-loader");
var utc = require("dayjs/plugin/utc");

const timezone = require("dayjs/plugin/timezone");
const dayjs = require("dayjs");
dayjs.extend(utc);
dayjs.extend(timezone);

const SERVE_CURRENTTIME_HOST = "localhost";
const SERVE_CURRENTTIME_PORT = 50000;

const options = {
    keepCase: true,
    longs: String,
    enums: String,
    defaults: true,
    oneofs: true,
};

function getCurrentTime(request, callback) {
    const timezone = request.timezone;
    const now = dayjs().tz(timezone);

    callback(null, {
        hours: now.hour(),
        minutes: now.minute(),
        seconds: now.second(),
        milliseconds: now.millisecond(),
        formatted_time: now.format("YYYY-MM-DDTHH:mm:ss.SSS"),
    });
}

function main() {
    var packageDefinition = protoLoader.loadSync(PROTO_PATH, options);
    const serveCurrentTimeProto = grpc.loadPackageDefinition(packageDefinition).serve_currenttime;
    const server = new grpc.Server();

    server.addService(serveCurrentTimeProto.ServeCurrentTimeService.service, {
        getCurrentTime: getCurrentTime,
    });

    server.bindAsync(
        `${SERVE_CURRENTTIME_HOST}:${SERVE_CURRENTTIME_PORT}`,
        grpc.ServerCredentials.createInsecure(),
        () => {
            console.log(`Starting server on ${SERVE_CURRENTTIME_HOST}:${SERVE_CURRENTTIME_PORT}`);
            server.start();
        }
    );
}

main();