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import { useState, useCallback, useEffect, useRef } from 'react'
import { css } from '../../../styled-system/css'
interface VisionDvrControlsProps {
/** Session ID for DVR requests */
sessionId: string
/** Whether DVR is available (buffer has data) */
isAvailable: boolean
/** Available time range in ms from recording start */
availableFromMs?: number
availableToMs?: number
/** Current problem start time in ms from recording start (for per-problem scrubbing) */
currentProblemStartMs?: number | null
/** Current problem number (for display) */
currentProblemNumber?: number | null
/** Callback to request a frame at offset */
onScrub: (offsetMs: number) => void
/** Callback when returning to live */
onGoLive: () => void
/** Whether currently showing live feed */
isLive: boolean
}
/**
* DVR controls for live vision feed observation.
*
* Allows observers to:
* - Scrub back within the current problem only
* - Return to live feed
* - See buffer availability for current problem
*/
export function VisionDvrControls({
sessionId,
isAvailable,
availableFromMs = 0,
availableToMs = 0,
currentProblemStartMs,
currentProblemNumber,
onScrub,
onGoLive,
isLive,
}: VisionDvrControlsProps) {
const [scrubPosition, setScrubPosition] = useState(100) // Percentage (100 = live)
const [isDragging, setIsDragging] = useState(false)
const sliderRef = useRef<HTMLDivElement>(null)
// Use current problem start as the effective scrub start (if available)
// This constrains scrubbing to the current problem only
const effectiveFromMs =
currentProblemStartMs != null
? Math.max(availableFromMs, currentProblemStartMs)
: availableFromMs
// Duration available for scrubbing (within current problem)
const bufferDuration = availableToMs - effectiveFromMs
const bufferSeconds = Math.floor(bufferDuration / 1000)
// Handle slider interaction
const handleSliderChange = useCallback(
(clientX: number) => {
if (!sliderRef.current || !isAvailable) return
const rect = sliderRef.current.getBoundingClientRect()
const percentage = Math.max(0, Math.min(100, ((clientX - rect.left) / rect.width) * 100))
setScrubPosition(percentage)
// Calculate offset from recording start (constrained to current problem)
const offsetMs = effectiveFromMs + (percentage / 100) * (availableToMs - effectiveFromMs)
onScrub(offsetMs)
},
[isAvailable, effectiveFromMs, availableToMs, onScrub]
)
// Mouse/touch handlers
const handleMouseDown = useCallback(
(e: React.MouseEvent) => {
if (!isAvailable) return
setIsDragging(true)
handleSliderChange(e.clientX)
},
[isAvailable, handleSliderChange]
)
const handleMouseMove = useCallback(
(e: MouseEvent) => {
if (isDragging) {
handleSliderChange(e.clientX)
}
},
[isDragging, handleSliderChange]
)
const handleMouseUp = useCallback(() => {
setIsDragging(false)
}, [])
// Global mouse handlers for dragging
useEffect(() => {
if (isDragging) {
document.addEventListener('mousemove', handleMouseMove)
document.addEventListener('mouseup', handleMouseUp)
return () => {
document.removeEventListener('mousemove', handleMouseMove)
document.removeEventListener('mouseup', handleMouseUp)
}
}
}, [isDragging, handleMouseMove, handleMouseUp])
// Go live handler
const handleGoLive = useCallback(() => {
setScrubPosition(100)
onGoLive()
}, [onGoLive])
// Format time for display
const formatTime = (ms: number) => {
const seconds = Math.floor(ms / 1000)
const mins = Math.floor(seconds / 60)
const secs = seconds % 60
return mins > 0 ? `${mins}:${secs.toString().padStart(2, '0')}` : `${secs}s`
}
// Calculate current offset for display (relative to current problem)
const currentOffsetMs =
effectiveFromMs + (scrubPosition / 100) * (availableToMs - effectiveFromMs)
const secondsAgo = Math.floor((availableToMs - currentOffsetMs) / 1000)
if (!isAvailable) {
return (
<div
data-component="vision-dvr-controls"
data-status="unavailable"
className={css({
display: 'flex',
alignItems: 'center',
gap: 2,
px: 2,
py: 1,
bg: 'rgba(0, 0, 0, 0.6)',
borderRadius: 'md',
fontSize: 'xs',
color: 'gray.500',
})}
>
<span>DVR not available</span>
</div>
)
}
return (
<div
data-component="vision-dvr-controls"
data-status={isLive ? 'live' : 'scrubbing'}
className={css({
display: 'flex',
flexDirection: 'column',
gap: 1,
p: 2,
bg: 'rgba(0, 0, 0, 0.7)',
backdropFilter: 'blur(4px)',
borderRadius: 'md',
})}
>
{/* Scrub slider */}
<div
ref={sliderRef}
data-element="scrub-slider"
className={css({
position: 'relative',
height: '20px',
cursor: 'pointer',
touchAction: 'none',
})}
onMouseDown={handleMouseDown}
>
{/* Track */}
<div
className={css({
position: 'absolute',
top: '50%',
left: 0,
right: 0,
height: '4px',
bg: 'gray.700',
borderRadius: 'full',
transform: 'translateY(-50%)',
})}
/>
{/* Buffer fill */}
<div
className={css({
position: 'absolute',
top: '50%',
left: 0,
height: '4px',
bg: 'cyan.600',
borderRadius: 'full',
transform: 'translateY(-50%)',
})}
style={{ width: `${scrubPosition}%` }}
/>
{/* Thumb */}
<div
className={css({
position: 'absolute',
top: '50%',
width: '12px',
height: '12px',
bg: 'white',
borderRadius: 'full',
transform: 'translate(-50%, -50%)',
boxShadow: 'md',
transition: isDragging ? 'none' : 'left 0.1s',
})}
style={{ left: `${scrubPosition}%` }}
/>
</div>
{/* Controls row */}
<div
className={css({
display: 'flex',
justifyContent: 'space-between',
alignItems: 'center',
fontSize: 'xs',
})}
>
{/* Buffer info - shows time available for current problem */}
<span className={css({ color: 'gray.400' })}>
{currentProblemNumber != null
? `Q${currentProblemNumber}: -${bufferSeconds}s`
: `-${bufferSeconds}s available`}
</span>
{/* Current position / Live button */}
{isLive ? (
<div
className={css({
display: 'flex',
alignItems: 'center',
gap: 1,
color: 'green.400',
})}
>
<div
className={css({
w: '6px',
h: '6px',
borderRadius: 'full',
bg: 'green.500',
animation: 'pulse 2s infinite',
})}
/>
<span>LIVE</span>
</div>
) : (
<div
className={css({
display: 'flex',
alignItems: 'center',
gap: 2,
})}
>
<span className={css({ color: 'yellow.400' })}>-{secondsAgo}s ago</span>
<button
onClick={handleGoLive}
className={css({
px: 2,
py: 0.5,
bg: 'green.600',
color: 'white',
borderRadius: 'md',
fontSize: 'xs',
fontWeight: 'medium',
cursor: 'pointer',
_hover: { bg: 'green.500' },
})}
>
Go Live
</button>
</div>
)}
</div>
</div>
)
}
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