import { DataService } from './DataService';
import { DataServiceDriver } from './DataServiceDriver';
import { MemoryDataService } from './MemoryDataService';

/**
 * Basic key value data service. This data service can be used to communicate
 * between workers and the main thread.
 */
export class KeyValueDataService extends DataService<string, any> {
    constructor(uid?: string, dataServiceDriver?: DataServiceDriver<string, any>) {
        super(dataServiceDriver);
        if (!dataServiceDriver) {
            this.driver = new MemoryDataService(Object, {
                serialize: (d) => d,
                deserialize: (d) => d,
            });
            this.driver.dataType = Object;
        }
        this.uid = uid || this.constructor.name;
    }

    /**
     * Get the value of a key
     * @param {string} key Key
     * @returns {Promise<any>} Promise of the value
     */
    getValue(key: string): Promise<any> {
        return this.findByUID(key);
    }

    /**
     * Set a value
     * @param {string} key Key to use
     * @param {any} value Value to store
     * @returns {Promise<void>} Promise of setting the value
     */
    setValue(key: string, value: any): Promise<void> {
        this.emit('set', key, value);
        return this.insert(key, value);
    }
}