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import { useRef, useCallback, useEffect, useState } from 'react'
interface SliderProps {
value: number
min: number
max: number
step?: number
onChange: (value: number) => void
}
export default function Slider({ value, min, max, step = 1, onChange }: SliderProps) {
const trackRef = useRef<HTMLDivElement>(null)
const [dragging, setDragging] = useState(false)
const pct = ((value - min) / (max - min)) * 100
const updateFromClient = useCallback((clientX: number) => {
const rect = trackRef.current?.getBoundingClientRect()
if (!rect) return
const raw = (clientX - rect.left) / rect.width
const clamped = Math.max(0, Math.min(1, raw))
const stepped = Math.round((min + clamped * (max - min)) / step) * step
onChange(Math.max(min, Math.min(max, stepped)))
}, [min, max, step, onChange])
const handleMouseDown = useCallback((e: React.MouseEvent) => {
e.preventDefault()
setDragging(true)
updateFromClient(e.clientX)
}, [updateFromClient])
useEffect(() => {
if (!dragging) return
const handleMove = (e: MouseEvent) => { e.preventDefault(); updateFromClient(e.clientX) }
const handleUp = () => setDragging(false)
window.addEventListener('mousemove', handleMove)
window.addEventListener('mouseup', handleUp)
return () => { window.removeEventListener('mousemove', handleMove); window.removeEventListener('mouseup', handleUp) }
}, [dragging, updateFromClient])
return (
<div
ref={trackRef}
className="relative h-4 w-full cursor-pointer flex items-center"
onMouseDown={handleMouseDown}
role="slider"
aria-valuemin={min}
aria-valuemax={max}
aria-valuenow={value}
tabIndex={0}
onKeyDown={(e) => {
if (e.key === 'ArrowRight' || e.key === 'ArrowUp') { e.preventDefault(); onChange(Math.min(max, value + step)) }
if (e.key === 'ArrowLeft' || e.key === 'ArrowDown') { e.preventDefault(); onChange(Math.max(min, value - step)) }
}}
>
<div className="absolute h-[3px] w-full rounded-full" style={{ backgroundColor: 'var(--color-panel-border)' }}>
<div
className="absolute h-full rounded-full transition-[width] duration-75"
style={{ width: `${pct}%`, backgroundColor: 'var(--color-accent)' }}
/>
</div>
<div
className="absolute w-3.5 h-3.5 rounded-full shadow-sm border-2 transition-transform duration-75"
style={{
left: `${pct}%`,
marginLeft: '-7px',
backgroundColor: dragging ? 'var(--color-accent)' : 'var(--color-panel-bg)',
borderColor: 'var(--color-accent)',
transform: dragging ? 'scale(1.15)' : 'scale(1)',
}}
/>
</div>
)
}
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