import * as plugins from "./smartsocket.plugins";

// import classes
import { Objectmap } from "lik";
import { SocketRole } from "./smartsocket.classes.socketrole";

// export interfaces

/**
 * interface of the contructor options of class SocketFunction
 */
export interface ISocketFunctionConstructorOptions {
    funcName: string;
    funcDef: any;
    allowedRoles: SocketRole[]; // all roles that are allowed to execute a SocketFunction
};

/**
 * interface of the Socket Function call, in other words the object that routes a call to a function
 */
export interface ISocketFunctionCall {
    funcName:string;
    funcDataArg:any;
};

/**
 * interface for function definition of SocketFunction
 */
export interface IFuncDef {
    (dataArg:any):PromiseLike<any>
}

// export objects
export let allSocketFunctions = new Objectmap<SocketFunction>();

// export classes

/**
 * class that respresents a function that can be transparently called using a SocketConnection
 */
export class SocketFunction {
    name: string;
    funcDef: IFuncDef;
    roles: SocketRole[];

    /**
     * the constructor for SocketFunction
     */
    constructor(optionsArg: ISocketFunctionConstructorOptions) {
        this.name = optionsArg.funcName;
        this.funcDef = optionsArg.funcDef;
        this.roles = optionsArg.allowedRoles;
        for (let socketRoleArg of this.roles){
            this._notifyRole(socketRoleArg);
        };
        allSocketFunctions.add(this); // map instance with Objectmap
    };

    /** 
     * notifies a role about access to this SocketFunction
     */
    private _notifyRole(socketRoleArg:SocketRole){
        socketRoleArg.addSocketFunction(this);
    }
    
    /**
     * invokes the function of this SocketFunction
     */
    invoke(dataArg:ISocketFunctionCall):plugins.q.Promise<any> {
        let done = plugins.q.defer();
        if(dataArg.funcName === this.name){
            this.funcDef(dataArg.funcDataArg)
                .then((resultData:any) => {
                    let funcResponseData:ISocketFunctionCall = {
                        funcName:this.name,
                        funcDataArg:resultData
                    }
                    done.resolve(funcResponseData);
                });
                
        } else {
            throw new Error("SocketFunction.name does not match the data argument's .name!");
        }
        return done.promise;        
    };

}