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import { css } from '@styled/css'
import * as Slider from '@radix-ui/react-slider'
import * as Tooltip from '@radix-ui/react-tooltip'
import * as Popover from '@radix-ui/react-popover'
import { useCallback, useEffect, useMemo, useRef, useState } from 'react'
import type { RangeThermometerProps } from './types'
/** Max region names to show in tooltip before truncating */
const MAX_TOOLTIP_NAMES = 8
/**
* A range thermometer component that displays discrete options with two handles
* for selecting a min/max range. Uses Radix Slider for accessibility and interaction.
*/
export function RangeThermometer<T extends string>({
options,
minValue,
maxValue,
onChange,
orientation = 'vertical',
isDark = false,
label,
description,
counts,
showTotalCount = true,
onHoverPreview,
regionNamesByCategory,
selectedRegionNames,
onRegionNameHover,
hideCountOnMd = false,
}: RangeThermometerProps<T>) {
const isVertical = orientation === 'vertical'
const [isDragging, setIsDragging] = useState(false)
// Track last sent values to prevent duplicate onChange calls during async updates
const lastSentRef = useRef<[number, number] | null>(null)
// Sync ref when props change from outside (e.g., parent resets values)
useEffect(() => {
const currentMinIndex = options.findIndex((opt) => opt.value === minValue)
const currentMaxIndex = options.findIndex((opt) => opt.value === maxValue)
// Only sync if we're not dragging (to avoid overwriting during drag)
if (!isDragging) {
lastSentRef.current = [currentMinIndex, currentMaxIndex]
}
}, [minValue, maxValue, options, isDragging])
// Convert values to indices - memoize to prevent recalculation
const minIndex = useMemo(
() => options.findIndex((opt) => opt.value === minValue),
[options, minValue]
)
const maxIndex = useMemo(
() => options.findIndex((opt) => opt.value === maxValue),
[options, maxValue]
)
// Handle slider value changes - memoized to prevent Slider re-renders
// Only call onChange when values actually change to prevent server thrashing
const handleValueChange = useCallback(
(values: number[]) => {
const [newMinIndex, newMaxIndex] = values
const last = lastSentRef.current
// Only fire if values differ from what we last sent (not props, which may be stale)
if (!last || newMinIndex !== last[0] || newMaxIndex !== last[1]) {
lastSentRef.current = [newMinIndex, newMaxIndex]
onChange(options[newMinIndex].value, options[newMaxIndex].value)
}
},
[onChange, options]
)
// Calculate what the range would be if clicking on a specific option
// (moves nearest handle to that position)
const getPreviewRange = useCallback(
(hoveredIndex: number): { previewMin: T; previewMax: T } => {
const distToMin = Math.abs(hoveredIndex - minIndex)
const distToMax = Math.abs(hoveredIndex - maxIndex)
if (distToMin <= distToMax) {
// Would move min handle
return {
previewMin: options[hoveredIndex].value,
previewMax: options[maxIndex].value,
}
} else {
// Would move max handle
return {
previewMin: options[minIndex].value,
previewMax: options[hoveredIndex].value,
}
}
},
[options, minIndex, maxIndex]
)
// Handle hover enter on an option - memoized
// Skip hover events while dragging to prevent interference
const handleOptionHover = useCallback(
(index: number) => {
if (onHoverPreview && !isDragging) {
onHoverPreview(getPreviewRange(index))
}
},
[onHoverPreview, getPreviewRange, isDragging]
)
// Handle hover leave - memoized
// Skip hover events while dragging to prevent interference
const handleOptionLeave = useCallback(() => {
if (onHoverPreview && !isDragging) {
onHoverPreview(null)
}
}, [onHoverPreview, isDragging])
// Handle drag start/end for the slider
const handlePointerDown = useCallback(() => {
setIsDragging(true)
// Clear any existing preview when starting to drag
if (onHoverPreview) {
onHoverPreview(null)
}
}, [onHoverPreview])
const handlePointerUp = useCallback(() => {
setIsDragging(false)
}, [])
// Listen for global pointer up to handle drag release anywhere on screen
useEffect(() => {
if (isDragging) {
const handleGlobalPointerUp = () => {
setIsDragging(false)
}
window.addEventListener('pointerup', handleGlobalPointerUp)
window.addEventListener('pointercancel', handleGlobalPointerUp)
return () => {
window.removeEventListener('pointerup', handleGlobalPointerUp)
window.removeEventListener('pointercancel', handleGlobalPointerUp)
}
}
}, [isDragging])
// Calculate total count for selected range
const totalCount = useMemo(() => {
if (!counts || !showTotalCount) return null
let total = 0
for (let i = minIndex; i <= maxIndex; i++) {
const opt = options[i]
total += counts[opt.value] || 0
}
return total
}, [counts, showTotalCount, options, minIndex, maxIndex])
// Check if an option is within the selected range
const isInRange = (index: number) => index >= minIndex && index <= maxIndex
// Format region names for tooltip display
const formatTooltipContent = useCallback(
(option: (typeof options)[0]) => {
const names = regionNamesByCategory?.[option.value]
if (!names || names.length === 0) return null
const count = names.length
const displayNames = names.slice(0, MAX_TOOLTIP_NAMES)
const remaining = count - displayNames.length
return {
header: `${option.emoji || ''} ${option.label} (${count} region${count !== 1 ? 's' : ''})`,
names: displayNames,
remaining,
}
},
[regionNamesByCategory]
)
return (
<Tooltip.Provider delayDuration={150} skipDelayDuration={100}>
<div
data-component="range-thermometer"
className={css({
display: 'flex',
flexDirection: 'column',
gap: '2',
})}
>
{/* Label and description */}
{(label || description) && (
<div>
{label && (
<div
className={css({
fontSize: 'xs',
fontWeight: 'semibold',
color: isDark ? 'gray.300' : 'gray.700',
mb: '0.5',
})}
>
{label}
</div>
)}
{description && (
<div
className={css({
fontSize: '2xs',
color: isDark ? 'gray.400' : 'gray.500',
lineHeight: '1.3',
})}
>
{description}
</div>
)}
</div>
)}
{/* Main container with labels and slider */}
<div
data-element="range-thermometer-track"
className={css({
display: 'flex',
flexDirection: isVertical ? 'row' : 'column',
justifyContent: 'space-between',
gap: '1',
})}
>
{/* Labels column */}
<div
className={css({
display: 'flex',
flexDirection: isVertical ? 'column' : 'row',
justifyContent: 'space-between',
flex: isVertical ? 'none' : 1,
})}
>
{options.map((option, index) => {
const inRange = isInRange(index)
const isOnly = minIndex === index && maxIndex === index
const count = counts?.[option.value]
const tooltipContent = formatTooltipContent(option)
const buttonElement = (
<div
data-option={option.value}
data-in-range={inRange}
onMouseEnter={() => handleOptionHover(index)}
onMouseLeave={handleOptionLeave}
className={css({
display: 'flex',
alignItems: 'center',
gap: '1',
py: '1',
px: '1.5',
rounded: 'md',
transition: 'all 0.15s',
bg: inRange ? (isDark ? 'blue.900/40' : 'blue.50') : 'transparent',
opacity: inRange ? 1 : 0.5,
_hover: {
bg: isDark ? 'gray.700' : 'gray.100',
opacity: 1,
'& [data-only-button]': {
opacity: 1,
},
},
})}
>
{/* Main clickable area */}
<button
type="button"
onClick={() => {
// Click moves nearest handle to this position
const distToMin = Math.abs(index - minIndex)
const distToMax = Math.abs(index - maxIndex)
if (distToMin <= distToMax) {
onChange(option.value, options[maxIndex].value)
} else {
onChange(options[minIndex].value, option.value)
}
}}
className={css({
display: 'flex',
alignItems: 'center',
gap: '1',
flex: 1,
cursor: 'pointer',
bg: 'transparent',
border: 'none',
padding: 0,
})}
>
{/* Emoji */}
{option.emoji && (
<span className={css({ fontSize: 'sm' })}>{option.emoji}</span>
)}
{/* Label */}
<span
className={css({
fontSize: 'xs',
fontWeight: inRange ? '600' : '500',
color: inRange
? isDark
? 'blue.300'
: 'blue.700'
: isDark
? 'gray.400'
: 'gray.600',
flex: 1,
textAlign: 'left',
})}
>
{option.shortLabel || option.label}
</span>
</button>
{/* Only button */}
<button
type="button"
data-only-button
title={`Show only ${option.label}`}
onClick={(e) => {
e.stopPropagation()
onChange(option.value, option.value)
}}
className={css({
fontSize: '2xs',
fontWeight: '600',
color: isOnly
? isDark
? 'green.300'
: 'green.700'
: isDark
? 'gray.400'
: 'gray.500',
bg: isOnly ? (isDark ? 'green.900/50' : 'green.100') : 'transparent',
border: '1px solid',
borderColor: isOnly
? isDark
? 'green.700'
: 'green.300'
: isDark
? 'gray.600'
: 'gray.300',
px: '1',
py: '0',
rounded: 'sm',
cursor: 'pointer',
opacity: isOnly ? 1 : 0,
transition: 'all 0.15s',
_hover: {
bg: isDark ? 'green.900/50' : 'green.100',
borderColor: isDark ? 'green.600' : 'green.400',
color: isDark ? 'green.300' : 'green.700',
},
})}
>
only
</button>
{/* Count badge */}
{count !== undefined && (
<span
className={css({
fontSize: '2xs',
fontWeight: '600',
color: inRange
? isDark
? 'blue.200'
: 'blue.600'
: isDark
? 'gray.500'
: 'gray.400',
bg: inRange
? isDark
? 'blue.800'
: 'blue.100'
: isDark
? 'gray.700'
: 'gray.200',
px: '1.5',
py: '0.5',
rounded: 'full',
minWidth: '6',
textAlign: 'center',
})}
>
{count}
</span>
)}
</div>
)
// Wrap with tooltip if we have region names to show
if (tooltipContent) {
return (
<Tooltip.Root key={option.value}>
<Tooltip.Trigger asChild>{buttonElement}</Tooltip.Trigger>
<Tooltip.Portal>
<Tooltip.Content
side="left"
sideOffset={8}
className={css({
bg: isDark ? 'gray.800' : 'gray.900',
color: 'white',
px: '3',
py: '2',
rounded: 'lg',
fontSize: 'xs',
maxWidth: '220px',
boxShadow: 'lg',
zIndex: 50,
lineHeight: '1.4',
})}
>
<div className={css({ fontWeight: '600', mb: '1' })}>
{tooltipContent.header}
</div>
<div className={css({ color: 'gray.300' })}>
{tooltipContent.names.join(', ')}
{tooltipContent.remaining > 0 && (
<span
className={css({
color: 'gray.400',
fontStyle: 'italic',
})}
>
{' '}
...and {tooltipContent.remaining} more
</span>
)}
</div>
<Tooltip.Arrow
className={css({
fill: isDark ? 'gray.800' : 'gray.900',
})}
/>
</Tooltip.Content>
</Tooltip.Portal>
</Tooltip.Root>
)
}
return <span key={option.value}>{buttonElement}</span>
})}
</div>
{/* Slider track */}
<div
className={css({
display: 'flex',
alignItems: 'center',
justifyContent: 'center',
width: isVertical ? '8' : 'auto',
height: isVertical ? 'auto' : '8',
minHeight: isVertical ? '180px' : 'auto',
})}
>
<Slider.Root
value={[minIndex, maxIndex]}
min={0}
max={options.length - 1}
step={1}
orientation={isVertical ? 'vertical' : 'horizontal'}
inverted={isVertical} // Vertical sliders need inversion so top = index 0
onValueChange={handleValueChange}
onPointerDown={handlePointerDown}
className={css({
position: 'relative',
display: 'flex',
alignItems: 'center',
userSelect: 'none',
touchAction: 'none',
width: isVertical ? '3' : '100%',
height: isVertical ? '100%' : '3',
})}
>
<Slider.Track
className={css({
bg: isDark ? 'gray.700' : 'gray.200',
position: 'relative',
flexGrow: 1,
rounded: 'full',
width: isVertical ? '3' : '100%',
height: isVertical ? '100%' : '3',
})}
>
<Slider.Range
className={css({
position: 'absolute',
bg: isDark ? 'blue.600' : 'blue.500',
rounded: 'full',
width: isVertical ? '100%' : 'auto',
height: isVertical ? 'auto' : '100%',
})}
/>
</Slider.Track>
{/* Min thumb */}
<Slider.Thumb
data-handle="min"
className={css({
display: 'block',
w: '4',
h: '4',
bg: 'white',
border: '2px solid',
borderColor: isDark ? 'blue.400' : 'blue.500',
rounded: 'full',
cursor: 'grab',
boxShadow: '0 2px 4px rgba(0,0,0,0.2)',
_hover: {
bg: isDark ? 'blue.100' : 'blue.50',
transform: 'scale(1.1)',
},
_focus: {
outline: 'none',
boxShadow: '0 0 0 3px rgba(59, 130, 246, 0.3)',
},
_active: {
cursor: 'grabbing',
},
})}
/>
{/* Max thumb */}
<Slider.Thumb
data-handle="max"
className={css({
display: 'block',
w: '4',
h: '4',
bg: 'white',
border: '2px solid',
borderColor: isDark ? 'blue.400' : 'blue.500',
rounded: 'full',
cursor: 'grab',
boxShadow: '0 2px 4px rgba(0,0,0,0.2)',
_hover: {
bg: isDark ? 'blue.100' : 'blue.50',
transform: 'scale(1.1)',
},
_focus: {
outline: 'none',
boxShadow: '0 0 0 3px rgba(59, 130, 246, 0.3)',
},
_active: {
cursor: 'grabbing',
},
})}
/>
</Slider.Root>
</div>
</div>
{/* Total count display - clickable to show all selected regions */}
{totalCount !== null && (
<div
className={css({
display: hideCountOnMd ? { base: 'block', md: 'none' } : 'block',
})}
>
<Popover.Root>
<Popover.Trigger asChild>
<button
type="button"
data-element="total-count"
className={css({
display: 'flex',
alignItems: 'center',
justifyContent: 'center',
gap: '1',
py: '1.5',
px: '2',
bg: isDark ? 'blue.900/30' : 'blue.50',
rounded: 'md',
border: '1px solid',
borderColor: isDark ? 'blue.800' : 'blue.200',
cursor: selectedRegionNames?.length ? 'pointer' : 'default',
transition: 'all 0.15s',
width: '100%',
_hover: selectedRegionNames?.length
? {
bg: isDark ? 'blue.900/50' : 'blue.100',
borderColor: isDark ? 'blue.700' : 'blue.300',
}
: {},
})}
>
<span
className={css({
fontSize: 'sm',
fontWeight: 'bold',
color: isDark ? 'blue.300' : 'blue.700',
textDecoration: selectedRegionNames?.length ? 'underline' : 'none',
textDecorationStyle: 'dotted',
textUnderlineOffset: '2px',
})}
>
{totalCount}
</span>
<span
className={css({
fontSize: 'xs',
color: isDark ? 'blue.400' : 'blue.600',
})}
>
regions
</span>
</button>
</Popover.Trigger>
{selectedRegionNames && selectedRegionNames.length > 0 && (
<Popover.Portal>
<Popover.Content
side="top"
sideOffset={8}
align="center"
className={css({
bg: isDark ? 'gray.800' : 'white',
border: '1px solid',
borderColor: isDark ? 'gray.700' : 'gray.200',
rounded: 'lg',
boxShadow: 'xl',
zIndex: 50,
width: '200px',
maxHeight: '300px',
overflow: 'hidden',
display: 'flex',
flexDirection: 'column',
})}
>
{/* Header */}
<div
className={css({
px: '3',
py: '2',
borderBottom: '1px solid',
borderColor: isDark ? 'gray.700' : 'gray.200',
fontWeight: '600',
fontSize: 'sm',
color: isDark ? 'gray.100' : 'gray.800',
})}
>
{selectedRegionNames.length} regions selected
</div>
{/* Scrollable list */}
<div
className={css({
overflowY: 'auto',
flex: 1,
py: '1',
})}
>
{selectedRegionNames
.slice()
.sort((a, b) => a.localeCompare(b))
.map((name) => (
<div
key={name}
onMouseEnter={() => onRegionNameHover?.(name)}
onMouseLeave={() => onRegionNameHover?.(null)}
className={css({
px: '3',
py: '1',
fontSize: 'xs',
color: isDark ? 'gray.300' : 'gray.600',
cursor: onRegionNameHover ? 'pointer' : 'default',
_hover: {
bg: isDark ? 'gray.700' : 'gray.100',
color: isDark ? 'gray.100' : 'gray.900',
},
})}
>
{name}
</div>
))}
</div>
<Popover.Arrow
className={css({
fill: isDark ? 'gray.800' : 'white',
})}
/>
</Popover.Content>
</Popover.Portal>
)}
</Popover.Root>
</div>
)}
</div>
</Tooltip.Provider>
)
}
|