import { getLogger } from "./logger";
import { WrapperStatusMessage } from "server-manager-shared";
import { JsonFileStore } from "./persistence/jsonFileStore";

const logger = getLogger("WrapperRegistry");

export interface WrapperInfo {

    id:string;

    hostname:string;

    commandQueue:string;

    cpu:number;

    ram:number;


    ramFree:number;


    online:boolean;

    lastHeartbeat:number;


    servers: WrapperStatusMessage["servers"];

}

interface WrapperRegistryState {
    wrappers: Array<{
        id:string;
        hostname:string;
        commandQueue:string;
        cpu:number;
        ram:number;
    }>;
}





export class WrapperRegistry {

    private wrappers =
        new Map<string, WrapperInfo>();

    private readonly persistence =
        new JsonFileStore<WrapperRegistryState>(
            "wrapperRegistry-state.json"
        );





    async init(): Promise<void> {
        const state = await this.persistence.load();

        if (!state)
            return;

        for (const wrapperData of state.wrappers) {
            this.wrappers.set(
                wrapperData.id,
                {
                    id: wrapperData.id,
                    hostname: wrapperData.hostname,
                    commandQueue: wrapperData.commandQueue,
                    cpu: wrapperData.cpu,
                    ram: wrapperData.ram,
                    ramFree: wrapperData.ram,
                    online: false,
                    lastHeartbeat: 0,
                    servers: []
                }
            );
        }
    }

    private toState(): WrapperRegistryState {
        return {
            wrappers: Array.from(this.wrappers.values()).map(
                wrapper => ({
                    id: wrapper.id,
                    hostname: wrapper.hostname,
                    commandQueue: wrapper.commandQueue,
                    cpu: wrapper.cpu,
                    ram: wrapper.ram
                })
            )
        };
    }

    private async saveState(): Promise<void> {
        await this.persistence.save(
            this.toState()
        );
    }

    add(wrapper:WrapperInfo){

        this.wrappers.set(
            wrapper.id,
            wrapper
        );

        logger.info(
            "Wrapper added:",
            wrapper.id
        );

        void this.saveState();
    }





    get(id:string){

        return this.wrappers.get(id);

    }





    getAll(){

        return Array.from(
            this.wrappers.values()
        );

    }





    updateHeartbeat(id:string){


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



        if(!wrapper)
            return;



        wrapper.lastHeartbeat =
            Date.now();


        wrapper.online =
            true;


    }




    update(wrapper:WrapperInfo){

        this.wrappers.set(
            wrapper.id,
            wrapper
        );

        void this.saveState();
    }


    checkOffline(timeout:number){


        const now =
            Date.now();



        for(const wrapper of this.wrappers.values()){


            if(
                wrapper.online &&
                now - wrapper.lastHeartbeat > timeout
            ){


                wrapper.online = false;


                logger.warn(
                    "Wrapper offline:",
                    wrapper.id
                );


            }


        }


    }

    updateStatus(data: WrapperStatusMessage){

        const wrapper =
            this.wrappers.get(
                data.wrapperId
            );



        if(!wrapper)
            return;



        wrapper.ramFree =
            data.ramFree;



        wrapper.servers =
            data.servers;



        wrapper.lastHeartbeat =
            Date.now();



        wrapper.online =
            true;



    }

}