/** Basic class for poppable elements that need to be closed as soon as one poppable is
 * shown.
 */
export default class Poppable {

    /** Register the poppable element in a context. Closes previously registered ones.
     * @param {*} context 
     */
    register(context) {
        let registered = Poppable.get(context)
        if (registered != null) {
            registered.close()
        }
        Poppable.set(context, this)
    }

    /**
     * Unregister object from context
     * @param {*} context 
     */
    unregister(context) {
        Poppable.delete(context)
    }

    /**
     * Returns the given poppable in a context
     * @static
     * @param {*} context
     * @returns
     * @memberof Poppable
     */
    static get(context) {
        return Poppable.registrations.get(context)
    }

    /** Sets the poppable in the given context 
    * @static
    * @param {*} context
    * @param {*} poppable
    * @returns
    * @memberof Poppable
    */
    static set(context, poppable) {
        return Poppable.registrations.set(context, poppable)
    }

    /** Test whether a poppable exists in the given context
     * 
     * @param {*} context 
     */
    static has(context) {
        return Poppable.registrations.has(context)
    }

    /**
     * Removes the poppable from the given context.
     *
     * @static
     * @param {*} context
     * @memberof Poppable
     */
    static delete(context) {
        Poppable.registrations.delete(context)
    }

    /** All poppable must implement a close method. */
    close() {
        console.error("Must be implemented")
    }
}

Poppable.registrations = new Map()