Refactored recordingApi.ts into a class

1 files changed, 149 insertions, 0 deletions

diff --git a/src/client/apis/recording/recordingApi.ts b/src/client/apis/recording/recordingApi.ts
new file mode 100644
index 000000000..bdeeb79ea
--- /dev/null
+++ b/src/client/apis/recording/recordingApi.ts
@@ -0,0 +1,149 @@
+import { CollectionFreeFormView } from "../../views/collections/collectionFreeForm";
+import React, { useState } from "react";
+import { observable } from "mobx";
+
+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;
+
+
+    constructor() {
+        this.currentPresentation = RecordingApi.NULL_PRESENTATION
+        this.isRecording = false;
+        this.absoluteStart = -1;
+    }
+
+    // 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
+    }
+
+    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 }
+    }
+
+    public 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)
+    }
+
+    // TOOD: need to pause all intervals if possible lol
+    // TODO: extract this into different class with pause and resume recording
+    public followMovements = (presentation: Presentation, docView: CollectionFreeFormView): void => {
+        const document = docView.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)
+        })
+    }
+
+}
\ No newline at end of file