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import { CollectionFreeFormView } from "../../views/collections/collectionFreeForm";
import React, { useState } from "react";
import { IReactionDisposer, observable, reaction } from "mobx";
import { NumCast } from "../../../fields/Types";
type Movement = {
time: number,
panX: number,
panY: number,
}
type Presentation = {
movements: Array<Movement>
meta: Object,
startDate: Date | null,
}
export class RecordingApi {
private static NULL_PRESENTATION: Presentation = {
movements: [],
meta: {},
startDate: null,
}
// instance variables
private currentPresentation: Presentation;
private isRecording: boolean;
private absoluteStart: number;
// create static instance and getter for global use
@observable static _instance: RecordingApi;
public static get instance(): RecordingApi { return RecordingApi._instance }
constructor() {
// init the global instance
RecordingApi._instance = this;
// init the instance variables
this.currentPresentation = RecordingApi.NULL_PRESENTATION
this.isRecording = false;
this.absoluteStart = -1;
// used for tracking movements in the view frame
this.disposeFunc = null;
// for now, set playFFView
this.playFFView = null;
}
// little helper :)
private get isInitPresenation(): boolean {
return this.currentPresentation.startDate === null
}
public start = (view: CollectionFreeFormView, meta?: Object): Error | undefined => {
// check if already init a presentation
if (!this.isInitPresenation) {
console.error('[recordingApi.ts] start() failed: current presentation data exists. please call clear() first.')
return new Error('[recordingApi.ts] start()')
}
// (1a) get start date for presenation
const startDate = new Date()
// (1b) set start timestamp to absolute timestamp
this.absoluteStart = startDate.getTime()
// (2) assign meta content if it exists
this.currentPresentation.meta = meta || {}
// (3) assign start date to currentPresenation
this.currentPresentation.startDate = startDate
// (4) set isRecording true to allow trackMovements
this.isRecording = true
}
public clear = (): Error | undefined => {
// TODO: maybe archive the data?
if (this.isRecording) {
console.error('[recordingApi.ts] clear() failed: currently recording presentation. call pause() or finish() first')
return new Error('[recordingApi.ts] clear()')
}
// clear presenation data
this.currentPresentation = RecordingApi.NULL_PRESENTATION
// clear isRecording
this.isRecording = false
// clear absoluteStart
this.absoluteStart = -1
// clear the disposeFunc
this.disposeFunc = null
}
public pause = (): Error | undefined => {
if (this.currentPresentation.startDate === null) {
console.error('[recordingApi.ts] pause() failed: no presentation started. try calling init() first')
return new Error('[recordingApi.ts] pause(): no presenation')
}
// don't allow track movments
this.isRecording = false
// set relativeStart to the pausedTimestamp
const timestamp = new Date().getTime()
this.absoluteStart = timestamp
}
public resume = () => {
const timestamp = new Date().getTime()
const startTimestamp = this.currentPresentation.startDate?.getTime()
if (!startTimestamp) {
console.error('[recordingApi.ts] resume() failed: no presentation data. try calling start() first')
return new Error('[recordingApi.ts] pause()')
}
// update absoluteStart to bridge the paused time
const absoluteTimePaused = timestamp - this.absoluteStart
this.absoluteStart = absoluteTimePaused
}
public finish = (): Error | Presentation => {
if (this.isInitPresenation) {
console.error('[recordingApi.ts] finish() failed: no presentation data. try calling start() first')
return new Error('[recordingApi.ts] finish()')
}
// return a copy of the the presentation data
return { ...this.currentPresentation }
}
private trackMovements = (panX: number, panY: number): Error | undefined => {
// ensure we are recording
if (!this.isRecording) {
console.error('[recordingApi.ts] pause() failed: recording is paused()')
return new Error('[recordingApi.ts] pause()')
}
// get the relative time
const timestamp = new Date().getTime()
const relativeTime = timestamp - this.absoluteStart
// make new movement struct
const movement: Movement = { time: relativeTime, panX, panY }
// add that movement to the current presentation data's movement array
this.currentPresentation.movements.push(movement)
}
// instance variable for the FFView
private disposeFunc: IReactionDisposer | null;
// set the FFView that will be used in a reaction to track the movements
public setRecordingFFView = (view: CollectionFreeFormView): void => {
// set the view to the current view
if (view === null) return;
//this.recordingFFView = view;
// set the reaction to track the movements
this.disposeFunc = reaction(
() => ({ x: NumCast(view.Document.panX, -1), y: NumCast(view.Document.panY, -1) }),
(res) => (res.x !== -1 && res.y !== -1) && this.trackMovements(res.x, res.y)
)
// for now, set the most recent recordingFFView to the playFFView
this.playFFView = view;
}
// call on dispose function to stop tracking movements
public removeRecordingFFView = (): void => {
this.disposeFunc?.();
this.disposeFunc = null;
}
// TODO: extract this into different class with pause and resume recording
private playFFView: CollectionFreeFormView | null;
public followMovements = (presentation: Presentation): undefined | Error => {
if (presentation.startDate === null || this.playFFView === null) {
return new Error('[recordingApi.ts] followMovements() failed: no presentation data or no view')
}
const document = this.playFFView.Document
const { movements } = presentation
movements.forEach(movement => {
const { panX, panY, time } = movement
// set the pan to what was stored
setTimeout(() => {
document._panX = panX;
document._panY = panY;
}, time)
})
}
// Unfinished code for tracing multiple free form views
// export let pres: Map<CollectionFreeFormView, IReactionDisposer> = new Map()
// export function AddRecordingFFView(ffView: CollectionFreeFormView): void {
// pres.set(ffView,
// reaction(() => ({ x: ffView.panX, y: ffView.panY }),
// (pt) => RecordingApi.trackMovements(ffView, pt.x, pt.y)))
// )
// }
// export function RemoveRecordingFFView(ffView: CollectionFreeFormView): void {
// const disposer = pres.get(ffView);
// disposer?.();
// pres.delete(ffView)
// }
}
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