import React from 'react' ; import { BehaviorSubject , Observable } from 'rxjs' ; import { map } from 'rxjs/operators' ; import { PriorityMap } from './priority_map' ; import { BannersList } from './banners_list' ; import { IUiSettingsClient } from '../../ui_settings' ; import { I18nStart } from '../../i18n' ; import { MountPoint } from '../../types' ; import { UserBannerService } from './user_banner_service' ; public export interface OverlayBannersStart { param mount MountPoint param priority returns a unique identifier for the given banner to be used with  OverlayBannersStart . remove and
     *           OverlayBannersStart . replace add ( mount , priority ? ) : string ; param id the unique identifier for the banner returned by  OverlayBannersStart . add returns remove ( id ) : boolean ; param id the unique identifier for the banner returned by  OverlayBannersStart . add param mount MountPoint param priority returns a new identifier for the given banner to be used with  OverlayBannersStart . remove and
     *           OverlayBannersStart . replace replace ( id , mount , priority ? ) : string ; internal get$ ( ) : Observable < OverlayBanner [ ] > ; getComponent ( ) : JSX . Element ; } internal export interface OverlayBanner { readonly id : string ; readonly mount : MountPoint ; readonly priority : number ; } interface StartDeps { i18n : I18nStart ; uiSettings : IUiSettingsClient ; } internal export class OverlayBannersService { private readonly userBanner = new UserBannerService ( ) ; public start ( { i18n , uiSettings } ) { let uniqueId = 0 ; const genId = ( ) => `${ uniqueId ++ }` ; const banners$ = new BehaviorSubject ( new PriorityMap < string , OverlayBanner > ( ) ) ; const service = { add : ( mount , priority = 0 ) => { const id = genId ( ) ; const nextBanner = { id , mount , priority } ; banners$ . next ( banners$ . value . add ( id , nextBanner ) ) ; return id ; } , remove : ( id ) => { if ( ! banners$ . value . has ( id ) ) { return false ; } banners$ . next ( banners$ . value . remove ( id ) ) ; return true ; } , replace ( id , mount , priority = 0 ) { if ( ! id || ! banners$ . value . has ( id ) ) { return this . add ( mount , priority ) ; } const nextId = genId ( ) ; const nextBanner = { id : nextId , mount , priority } ; banners$ . next ( banners$ . value . remove ( id ) . add ( nextId , nextBanner ) ) ; return nextId ; } , get$ ( ) { return banners$ . pipe ( map ( ( bannerMap ) => [ ... bannerMap . values ( ) ] ) ) ; } , getComponent ( ) { return < BannersList banners$ = { this . get$ ( ) } />; } , } ; this . userBanner . start ( { banners : service , i18n , uiSettings } ) ; return service ; } public stop ( ) { this . userBanner . stop ( ) ; } }