/**
 * @author Martin Karkowski
 * @email m.karkowski@zema.de
 * @create date 2020-10-12 18:53:00
 * @modify date 2020-10-13 13:10:50
 * @desc [description]
 */

import { inject, injectable } from "inversify";
import { DISPATCHER_INSTANCE, OBSERVABLE_FACTORY } from "../symbols/identifiers";
import { IFunctionOptions, IPropertyOptions } from "../types/descriptor.interface";
import { INopeDispatcher } from "../types/nopeDispatcher.interface";
import { INopeModuleDescription } from "../types/nopeModule.interface";
import { INopeObservable } from "../types/nopeObservable.interface";
import { NopeBaseModule } from "./BaseModule";

export interface ICallableObject { [index: string]: <T>(...args) => Promise<T> } 

@injectable()
export class NopeGenericModule extends NopeBaseModule {

    dynamicInstanceMethods: ICallableObject = {};
    dynamicInstanceProperties: {[index: string]: INopeObservable<any>} = {};

    protected _description: INopeModuleDescription;

    /**
     * Function, used to add the Attributes based on the Description.
     *
     * @param {INopeModuleDescription} description
     * @param {('overwrite' | 'add')} [mode='overwrite']
     * @memberof NopeGenericModule
     */
    public fromDescription(description: INopeModuleDescription, mode:'overwrite' | 'add' = 'overwrite'){
        
        const _this = this;

        if (mode === 'overwrite'){
            this.dispose();

            this.author = description.author;
            this.description = description.description;
            this.type = description.type;
            this.identifier = description.identifier;
        }

        if (this.author == null){
            this.author = description.author;
        }

        if (this.description == null){
            this.description = description.description;
        }

        if (this.version == null){
            this.version = description.version;
        }

        if (this.identifier == null){
            this.identifier = description.identifier;
        }        

        for (const name in description.functions){
            const options = description.functions[name];
            const func = async (...args) => {
                return await _this._dispatcher.performCall(options.id, args, options);
            };


            if (this.dynamicInstanceMethods[name]){
                throw Error('Name alread used. Not able to use the method name twice')
            }
            (this.dynamicInstanceMethods as any)[name] = func;
            // If the Function isnt dynamic, register it on the Object itself. 
            if (!options.isDynamic) {
                if (this[name]){
                    throw Error('Name alread used. Not able to use the method name twice')
                }
                this[name] = func;
            }

            this._registeredFunctions.set(name, {
                func,
                options
            });
        }
        
        for (const name in description.properties){
            const options = description.properties[name];

            // Add only elements, that are subscribed. 
            // Properties, which are only publishing
            // should throw an error, if data is published
            // in a remote. This is done to maintain 
            // consistency.
            // let mode = prop.mode;

            if (this.dynamicInstanceProperties[name]){
                throw Error('Name alread used. Not able to use the method name twice')
            }

            // Make shure it isnt published.
            options.preventSendingToRegistery = true;

            // Register the Observable:
            this.dynamicInstanceProperties[name] = this._dispatcher.registerObservable(
                // Assign a new Observable.
                this._observableFactory(),
                // Use the provided Properties:
                options
            );       

            if (!options.isDynamic) {
                if (this[name]){
                    throw Error('Name alread used. Not able to use the method name twice')
                }
                // Use the Same Element.
                this[name] = this.dynamicInstanceProperties[name];
            }

            this._registeredProperties.set(name, {
                observable: this.dynamicInstanceProperties[name],
                options
            });

        }
    }

    constructor(
        @inject(DISPATCHER_INSTANCE) _dispatcher: INopeDispatcher,
        @inject(OBSERVABLE_FACTORY) protected _observableFactory: () => INopeObservable<any>
    ) {
        super(_dispatcher);        
    }

    public async listFunctions(): Promise<{ func: (...args: any[]) => Promise<any>; options: IFunctionOptions; }[]> {
        const _this =this;
        return Object.getOwnPropertyNames(this.dynamicInstanceMethods).map(name => {
            return {
                func: _this.dynamicInstanceMethods[name],
                options: null
            }
        })
        
    }

    public async registerProperty<T, K = any, S = T, G = T>(name: string, observable: INopeObservable<T, S, G>, options: IPropertyOptions<K>): Promise<void> {
        throw Error('Function Should not be called on remote!');
    }

    public async registerFunction(name: string, func: (...args: any[]) => Promise<any>, options: IFunctionOptions): Promise<void> {
        throw Error('Function Should not be called on remote!');
    }

    public async unregisterFunction(name: string): Promise<void> {
        throw Error('Function Should not be called on remote!');
    }

    public async unregisterProperty<T, K = any, S = T, G = T>(name: string): Promise<void> {
        throw Error('Function Should not be called on remote!');
    }

    public async init(): Promise<void> {
        try {
            await super.init();
        } catch (e) {
            throw Error('Call fromDescription before using');
        }
    }

    public async dispose(){
        for (const name in this.dynamicInstanceProperties){
            this.dynamicInstanceProperties[name].dispose();
            // Remove Reference
            delete this[name];
        }

        this._registeredFunctions.clear();

        this.dynamicInstanceProperties = {};

        for (const name in this.dynamicInstanceMethods) {
            delete this[name];
            delete this.dynamicInstanceMethods[name];
        }

        this._registeredProperties.clear();
    }
}