import { getLogger } from "./logger";
import { Rabbit } from "./rabbit";
import { randomUUID } from "crypto";
import { WrapperRegistry, WrapperInfo } from "./wrapperRegistry";
import { ServerRegistry } from "./serverRegistry";
import {
  WrapperRegisterMessage,
  WrapperHeartbeatMessage,
  WrapperStatusMessage,
  ServerStartCommand,
  ServerStopCommand
} from "server-manager-shared";

type WrapperMessage =
  | WrapperRegisterMessage
  | WrapperHeartbeatMessage
  | WrapperStatusMessage;

const logger = getLogger("WrapperManager");


export class WrapperManager {


    constructor(
        private rabbit: Rabbit,
        private registry: WrapperRegistry,
        private serverRegistry: ServerRegistry
    ){

    }



    async start(){


        const queue =
            "wrapper.register";



        await this.rabbit.channel.assertQueue(
            queue
        );



        logger.info(
            "Warte auf Wrapper..."
        );



        this.rabbit.channel.consume(

            queue,

            async msg => {


                if(!msg)
                    return;



                const data =
                    JSON.parse(
                        msg.content.toString()
                    ) as WrapperMessage;



                switch(data.type){



                    case "wrapper.register":


                        await this.register(
                            data
                        );


                        break;



                    case "wrapper.heartbeat":


                        this.heartbeat(
                            data
                        );


                        break;



                    case "wrapper.status":


                        logger.debug(
                        "Status update received from wrapper-id",
                        data.wrapperId
                    );

                    this.registry.updateStatus(
                            data
                        );

                        this.serverRegistry.syncWrapperStatus(
                            data
                        );


                        break;



                    default:


logger.warn(
                            "Unbekannte Nachricht:",
                            data
                        );


                }



                this.rabbit.channel.ack(
                    msg
                );


            }

        );





        // Offline Check

        setInterval(()=>{


            this.registry.checkOffline(
                30000
            );


        },5000);



    }








    async register(data: WrapperRegisterMessage){



        let id =
            data.wrapperId;




        /*
            Neue Wrapper bekommen eine ID
        */

        if(!id){


            id =
                "wrp-" +
                randomUUID()
                .slice(0,8);



            logger.debug(
                "Neue Wrapper ID:",
                id
            );


        }





        const existing =
            this.registry.get(
                id
            );





        /*
            Wrapper war schon bekannt
        */

        if(existing){


            existing.online = true;


            existing.lastHeartbeat =
                Date.now();



            existing.hostname =
                data.hostname;



            existing.cpu =
                data.cpu;



            existing.ram =
                data.ram;



            existing.ramFree =
                data.ram;



            // servers are updated via wrapper.status, not wrapper.register



            this.registry.update(existing);


        }



        /*
            Neuer Wrapper
        */

        else {



            const commandQueue =
                `wrapper.${id}.commands`;




            await this.rabbit.channel.assertQueue(
                commandQueue
            );





            const wrapper:WrapperInfo = {


                id,


                hostname:
                    data.hostname,



                commandQueue,



                cpu:
                    data.cpu,



                ram:
                    data.ram,



                ramFree:
                    data.ram,



                servers:
                    [],



                online:true,



                lastHeartbeat:
                    Date.now()



            };





            this.registry.add(
                wrapper
            );



        }








        /*
            Antwort zurück an Wrapper
        */


        const wrapper =
            this.registry.get(
                id
            );




        if(data.replyQueue){


            this.rabbit.channel.sendToQueue(


                data.replyQueue,


                Buffer.from(

                    JSON.stringify({


                        type:
                            "wrapper.registered",



                        wrapperId:
                            id,



                        commandQueue:
                            wrapper?.commandQueue


                    })

                )

            );


        }




    }









    heartbeat(data: WrapperHeartbeatMessage){



        this.registry.updateHeartbeat(

            data.wrapperId

        );



        logger.debug(

            "Heartbeat:",

            data.wrapperId

        );



    }









    sendCommand(

        wrapperId:string,

        command: ServerStartCommand | ServerStopCommand

    ){



        const wrapper =
            this.registry.get(
                wrapperId
            );




        if(!wrapper){


            throw new Error(

                "Wrapper nicht gefunden"

            );


        }





        this.rabbit.channel.sendToQueue(


            wrapper.commandQueue,



            Buffer.from(

                JSON.stringify(
                    command
                )

            )

        );



    }









    getWrappers(){


        return this.registry.getAll();


    }









    listWrappers(){



        const wrappers =
            this.registry.getAll();




        logger.info(

            "Wrapper Übersicht ausgegeben"

        );





        if(wrappers.length===0){


            logger.info(

                "Keine Wrapper registriert"

            );


            return;


        }






        for(const wrapper of wrappers){



            logger.info(`

ID:
${wrapper.id}


Host:
${wrapper.hostname}


CPU:
${wrapper.cpu} Cores


RAM:
${wrapper.ram} MB


RAM frei:
${wrapper.ramFree} MB


Server:
${wrapper.servers.length}


Online:
${wrapper.online}


Heartbeat:
${new Date(
    wrapper.lastHeartbeat
).toLocaleString()}


----------------------

`);




        }



    }




}