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import { CollectionFreeFormView } from "../../views/collections/collectionFreeForm";
import React, { useState } from "react";
export function RecordingApi() {
type Movement = {
time: number,
panX: number,
panY: number,
}
type Presentation = {
movements: Array<Movement>
meta: Object,
startDate: Date | null,
}
const NULL_PRESENTATION = {
movements: [],
meta: {},
startDate: null,
}
const [currentPresentation, setCurrentPresenation] = useState<Presentation>(NULL_PRESENTATION)
const [isRecording, setIsRecording] = useState(false)
const [absoluteStart, setAbsoluteStart] = useState<number>(-1)
const initAndStart = (view: CollectionFreeFormView, meta?: Object): Error | undefined => {
// check if already init a presentation
if (currentPresentation.startDate !== null) {
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
setAbsoluteStart(startDate.getTime())
// TODO: (2) assign meta content
// (3) assign init values to currentPresenation
setCurrentPresenation({ ...currentPresentation, startDate })
// (4) set isRecording true to allow trackMovements
setIsRecording(true)
}
const clear = (): Error | undefined => {
// TODO: maybe archive the data?
if (isRecording) {
console.error('[recordingApi.ts] clear() failed: currently recording presentation. call pause() or finish() first')
return new Error('[recordingApi.ts] clear()')
}
// clear presenation data
setCurrentPresenation(NULL_PRESENTATION)
// clear isRecording
setIsRecording(false)
// clear absoluteStart
setAbsoluteStart(-1)
}
const pause = (): Error | undefined => {
if (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
setIsRecording(false)
// set relativeStart to the pausedTimestamp
const timestamp = new Date().getTime()
setAbsoluteStart(timestamp)
}
const resume = () => {
if (currentPresentation.startDate === null) {
console.error('[recordingApi.ts] resume() failed: no presentation started. try calling init() first')
return new Error('[recordingApi.ts] resume()')
}
const timestamp = new Date().getTime()
const startTimestamp = currentPresentation.startDate?.getTime()
if (!startTimestamp) {
console.error('[recordingApi.ts] resume() failed: no presentation data. try calling init() first')
return new Error('[recordingApi.ts] pause()')
}
setAbsoluteStart(prevTime => {
// const relativeUnpause = timestamp - absoluteStart
// const timePaused = relativeUnpause - prevTime
// return timePaused + absoluteStart
const absoluteTimePaused = timestamp - prevTime
return absoluteTimePaused
})
}
const finish = (): Error | Presentation => {
if (currentPresentation.movements === null) {
console.error('[recordingApi.ts] finish() failed: no presentation data. try calling init() first')
return new Error('[recordingApi.ts] finish()')
}
// make copy and clear this class's data
const returnCopy = { ...currentPresentation }
clear()
// return the copy
return returnCopy
}
const trackMovements = (panX: number, panY: number): Error | undefined => {
// ensure we are recording
if (!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 - absoluteStart
// make new movement struct
const movement: Movement = { time: relativeTime, panX, panY }
// add that movement struct to the current presentation data
setCurrentPresenation(prevPres => {
const movements = [...prevPres.movements, movement]
return {...prevPres, movements}
})
}
// TOOD: need to pause all intervals if possible lol
// TODO: extract this into different class with pause and resume recording
const 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)
})
}
}
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