dev@460: /**
dev@460:  * Created by lucast on 08/06/2017.
dev@460:  */
dev@460: import {KnownShapedFeature} from '../visualisations/FeatureUtilities';
dev@497: import {OneShotExtractionRequest as SimpleRequest} from 'piper-js/one-shot';
dev@460: export abstract class Item {
dev@460:   id: string;
dev@460:   hasSharedTimeline: boolean;
dev@460:   title?: string;
dev@460:   description?: string;
dev@460:   progress?: number;
dev@460: }
dev@460: 
dev@460: export interface RootAudioItem extends Item {
dev@460:   uri: string;
dev@460:   mimeType?: string;
dev@460:   isExportable?: boolean;
dev@460: }
dev@460: export interface LoadedRootAudioItem extends RootAudioItem {
dev@460:   audioData: AudioBuffer;
dev@460: }
dev@460: 
dev@460: export interface AnalysisItem extends Item {
dev@460:   parent: LoadedRootAudioItem;
dev@460:   extractorKey: string;
dev@460:   outputId: string;
dev@460: }
dev@460: 
dev@460: export type ExtractedAnalysisItem = AnalysisItem & KnownShapedFeature & {
dev@460:   unit?: string
dev@460: };
dev@460: 
dev@460: export function isItem(item: Item): item is Item {
dev@460:   return item.id != null && item.hasSharedTimeline != null;
dev@460: }
dev@460: 
dev@460: export function isPendingRootAudioItem(item: Item): item is RootAudioItem {
dev@460:   return isItem(item) && typeof (item as RootAudioItem).uri === 'string';
dev@460: }
dev@460: 
dev@460: export function isLoadedRootAudioItem(item: Item): item is LoadedRootAudioItem {
dev@460:   return item && isPendingRootAudioItem(item) &&
dev@460:     (item as LoadedRootAudioItem).audioData instanceof AudioBuffer;
dev@460: }
dev@460: 
dev@460: export function isPendingAnalysisItem(item: Item): item is AnalysisItem {
dev@460:   const downcast = (item as ExtractedAnalysisItem);
dev@460:   return isLoadedRootAudioItem(downcast.parent)
dev@460:     && typeof downcast.extractorKey === 'string';
dev@460: }
dev@460: 
dev@460: export function isExtractedAnalysisItem(it: Item): it is ExtractedAnalysisItem {
dev@460:   const downcast = (it as ExtractedAnalysisItem);
dev@460:   return isPendingAnalysisItem(it) &&
dev@460:     downcast.shape != null &&
dev@460:     downcast.collected != null;
dev@460: }
dev@460: 
dev@463: export function getRootAudioItem(item: Item): RootAudioItem {
dev@463:   if (isPendingRootAudioItem(item)) {
dev@463:     return item;
dev@463:   }
dev@463:   if (isPendingAnalysisItem(item)) {
dev@463:     return item.parent;
dev@463:   }
dev@463:   throw new Error('Invalid item.');
dev@463: }
dev@463: 
dev@460: // these should probably be actual concrete types with their own getUri methods
dev@460: export function getRootUri(item: Item): string {
dev@463:   return getRootAudioItem(item).uri;
dev@460: }
dev@460: 
dev@460: export function createExtractionRequest(item: AnalysisItem): SimpleRequest {
dev@460:   return {
dev@460:     audioData: [...Array(item.parent.audioData.numberOfChannels).keys()]
dev@460:       .map(i => item.parent.audioData.getChannelData(i)),
dev@460:     audioFormat: {
dev@460:       sampleRate: item.parent.audioData.sampleRate,
dev@460:       channelCount: item.parent.audioData.numberOfChannels,
dev@460:       length: item.parent.audioData.length
dev@460:     },
dev@460:     key: item.extractorKey,
dev@460:     outputId: item.outputId
dev@460:   };
dev@460: }