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import { useMemo } from 'react'
import { useTheme } from '@/contexts/ThemeContext'
import { computeTermCountRange } from '@/lib/curriculum/config/term-count-scaling'
import type { SessionMode } from '@/lib/curriculum/session-mode'
import { Tooltip } from '@/components/ui/Tooltip'
import { css } from '../../../../styled-system/css'
import {
useStartPracticeModal,
COMFORT_ADJUSTMENTS,
type ProblemLengthPreference,
} from '../StartPracticeModalContext'
const OPTIONS: { pref: ProblemLengthPreference; label: string }[] = [
{ pref: 'shorter', label: 'Shorter' },
{ pref: 'recommended', label: 'Recommended' },
{ pref: 'longer', label: 'Longer' },
]
const MODE_LABELS: Record<string, string> = {
abacus: 'Abacus',
visualization: 'Viz',
linear: 'Linear',
}
const MODE_ORDER = ['abacus', 'visualization', 'linear'] as const
function getModeSubtitle(sessionModeType: string): string {
switch (sessionModeType) {
case 'remediation':
return 'Building foundations'
case 'progression':
return 'Learning new skills'
case 'maintenance':
return 'Reinforcing mastery'
default:
return 'Adapts to mastery'
}
}
function getReadinessLabel(comfort: number): string {
const pct = comfort * 100
if (pct < 15) return 'Just starting'
if (pct < 35) return 'Developing'
if (pct < 55) return 'Building confidence'
if (pct < 75) return 'Getting comfortable'
return 'Highly fluent'
}
function getModeContextSentence(sessionMode: SessionMode): string {
switch (sessionMode.type) {
case 'remediation':
return 'Remediation mode \u2014 shorter problems help focus on fundamentals. As skills strengthen, problems will naturally get longer.'
case 'progression':
return `Learning ${sessionMode.nextSkill.displayName}. Readiness is adjusted while building new skills.`
case 'maintenance':
return `Reinforcing ${sessionMode.skillCount} skills. Readiness fully reflects mastery.`
}
}
/**
* Compute per-mode term count ranges for a given comfort adjustment.
* Returns ranges for each enabled mode using its mode-specific comfort level.
*/
function computePerModeRanges(
comfortByMode: Record<string, number>,
overallComfort: number,
enabledParts: Record<string, boolean>,
adjustment: number
): Record<string, { min: number; max: number }> {
const result: Record<string, { min: number; max: number }> = {}
for (const mode of MODE_ORDER) {
if (!enabledParts[mode]) continue
const base = comfortByMode[mode] ?? overallComfort
const adjusted = Math.max(0, Math.min(1, base + adjustment))
result[mode] = computeTermCountRange(mode, adjusted)
}
return result
}
function formatRange(min: number, max: number): string {
return min === max ? `${min}` : `${min}\u2013${max}`
}
/**
* Format per-mode ranges into a compact display string.
* If all enabled modes have the same range, returns a single range (e.g. "2\u20134").
* Otherwise returns per-mode ranges (e.g. "🧮2\u20135 🧠2\u20133").
*/
function formatRangeText(perModeRanges: Record<string, { min: number; max: number }>): string {
const entries = MODE_ORDER.filter((m) => perModeRanges[m] !== undefined).map((m) => ({
mode: m,
...perModeRanges[m],
}))
if (entries.length === 0) return '2\u20134'
// Check if all ranges are identical
const allSame = entries.every((e) => e.min === entries[0].min && e.max === entries[0].max)
if (allSame || entries.length === 1) {
return formatRange(entries[0].min, entries[0].max)
}
// Show per-mode with emoji labels
const modeEmojis: Record<string, string> = {
abacus: '\u{1F9EE}',
visualization: '\u{1F9E0}',
linear: '\u{1F4AD}',
}
return entries.map((e) => `${modeEmojis[e.mode]}${formatRange(e.min, e.max)}`).join(' ')
}
function formatModeReadiness(
comfortByMode: Record<string, number>,
enabledParts: Record<string, boolean>
): string | null {
const parts: string[] = []
for (const mode of MODE_ORDER) {
if (enabledParts[mode] && comfortByMode[mode] !== undefined) {
parts.push(`${MODE_LABELS[mode]} ${Math.round(comfortByMode[mode] * 100)}%`)
}
}
return parts.length > 1 ? parts.join(' \u00b7 ') : null
}
function MasteryScaleTooltipContent({
comfortLevel,
comfortByMode,
sessionMode,
enabledParts,
ranges,
}: {
comfortLevel: number
comfortByMode: Record<string, number>
sessionMode: SessionMode
enabledParts: Record<string, boolean>
ranges: Record<ProblemLengthPreference, Record<string, { min: number; max: number }>>
}) {
const readinessPct = Math.round(comfortLevel * 100)
const readinessLabel = getReadinessLabel(comfortLevel)
const modeReadiness = formatModeReadiness(comfortByMode, enabledParts)
// Marker positions on the 0-1 scale, clamped
const shorterPct = Math.max(0, Math.min(1, comfortLevel + COMFORT_ADJUSTMENTS.shorter)) * 100
const recommendedPct = comfortLevel * 100
const longerPct = Math.max(0, Math.min(1, comfortLevel + COMFORT_ADJUSTMENTS.longer)) * 100
// Format ranges for legend — show per-mode breakdown
const enabledModes = MODE_ORDER.filter((m) => enabledParts[m])
const hasMultipleModes = enabledModes.length > 1
const hasPerModeData = Object.keys(comfortByMode).length > 0
return (
<div data-element="mastery-scale-tooltip" style={{ minWidth: 220 }}>
<div style={{ fontWeight: 600, fontSize: '0.8125rem', marginBottom: '0.25rem' }}>
Problem Length & Mastery
</div>
<div style={{ fontSize: '0.75rem', color: '#d1d5db', marginBottom: '0.75rem' }}>
{modeReadiness ?? `${readinessPct}% readiness`} — {readinessLabel}
</div>
{/* Visual mastery bar */}
<div style={{ marginBottom: '0.25rem' }}>
<div
data-element="mastery-bar"
style={{
position: 'relative',
height: 8,
borderRadius: 4,
background: 'linear-gradient(to right, #3b82f6, #8b5cf6, #ec4899)',
}}
>
{/* Shorter marker */}
<div
style={{
position: 'absolute',
left: `${shorterPct}%`,
top: -2,
transform: 'translateX(-50%)',
}}
>
<div
style={{
width: 6,
height: 12,
borderRadius: 2,
background: '#60a5fa',
}}
/>
</div>
{/* Recommended marker (current) */}
<div
style={{
position: 'absolute',
left: `${recommendedPct}%`,
top: -4,
transform: 'translateX(-50%)',
}}
>
<div
style={{
width: 8,
height: 16,
borderRadius: 3,
background: 'white',
boxShadow: '0 0 4px rgba(255,255,255,0.5)',
}}
/>
</div>
{/* Longer marker */}
<div
style={{
position: 'absolute',
left: `${longerPct}%`,
top: -2,
transform: 'translateX(-50%)',
}}
>
<div
style={{
width: 6,
height: 12,
borderRadius: 2,
background: '#f472b6',
}}
/>
</div>
</div>
{/* Scale labels */}
<div
style={{
display: 'flex',
justifyContent: 'space-between',
fontSize: '0.6875rem',
color: '#9ca3af',
marginTop: '0.25rem',
}}
>
<span>2 terms</span>
<span>8 terms</span>
</div>
</div>
{/* Legend with per-mode ranges */}
<div
style={{
display: 'flex',
flexDirection: 'column',
gap: '0.1875rem',
fontSize: '0.75rem',
marginTop: '0.5rem',
marginBottom: '0.5rem',
}}
>
{(['shorter', 'recommended', 'longer'] as const).map((pref) => {
const prefRanges = ranges[pref]
const markerStyle =
pref === 'shorter'
? { width: 6, height: 10, background: '#60a5fa' }
: pref === 'recommended'
? {
width: 8,
height: 14,
background: 'white',
boxShadow: '0 0 4px rgba(255,255,255,0.5)',
}
: { width: 6, height: 10, background: '#f472b6' }
const label =
pref === 'shorter' ? 'Shorter' : pref === 'recommended' ? 'Recommended' : 'Longer'
return (
<div key={pref}>
<div
style={{ display: 'flex', justifyContent: 'space-between', alignItems: 'center' }}
>
<span style={{ display: 'flex', alignItems: 'center', gap: 6 }}>
<span
style={{
display: 'inline-block',
borderRadius: pref === 'recommended' ? 3 : 2,
flexShrink: 0,
...markerStyle,
}}
/>
{label}
</span>
<span style={{ color: '#9ca3af' }}>{formatRangeText(prefRanges)}</span>
</div>
{/* Show per-mode breakdown if modes have different ranges */}
{hasMultipleModes &&
hasPerModeData &&
(() => {
const modeEntries = enabledModes
.map((m) => ({ mode: m, range: prefRanges[m] }))
.filter((e) => e.range)
const allSame = modeEntries.every(
(e) =>
e.range.min === modeEntries[0].range.min &&
e.range.max === modeEntries[0].range.max
)
if (allSame) return null
return (
<div
style={{
fontSize: '0.6875rem',
color: '#6b7280',
marginLeft: 18,
marginTop: 1,
}}
>
{modeEntries
.map(
(e) => `${MODE_LABELS[e.mode]} ${formatRange(e.range.min, e.range.max)}`
)
.join(' \u00b7 ')}
</div>
)
})()}
</div>
)
})}
</div>
{/* Mode context */}
<div
style={{
fontSize: '0.6875rem',
color: '#9ca3af',
lineHeight: 1.4,
borderTop: '1px solid rgba(255,255,255,0.1)',
paddingTop: '0.5rem',
}}
>
{getModeContextSentence(sessionMode)}
</div>
</div>
)
}
const MODE_EMOJIS: Record<string, string> = {
abacus: '\u{1F9EE}',
visualization: '\u{1F9E0}',
linear: '\u{1F4AD}',
}
/**
* Shows the per-mode term count range for the currently selected preference.
* Single line when all modes share the same range. Per-mode breakdown otherwise.
* When modes differ, readiness % is included per-mode to avoid repeating mode labels.
*/
function SelectedRangeDetail({
perModeRanges,
comfortByMode,
overallComfort,
isDark,
}: {
perModeRanges: Record<string, { min: number; max: number }>
comfortByMode: Record<string, number>
overallComfort: number
isDark: boolean
}) {
const entries = MODE_ORDER.filter((m) => perModeRanges[m] !== undefined).map((m) => ({
mode: m,
...perModeRanges[m],
}))
if (entries.length === 0) return null
const allSame = entries.every((e) => e.min === entries[0].min && e.max === entries[0].max)
return (
<div
data-element="selected-range-detail"
className={css({
fontSize: '0.625rem',
color: isDark ? 'gray.500' : 'gray.500',
marginTop: '0.375rem',
textAlign: 'center',
lineHeight: '1.4',
'@media (max-width: 480px), (max-height: 700px)': {
marginTop: '0.25rem',
fontSize: '0.5625rem',
},
})}
>
{allSame || entries.length === 1 ? (
<span>{formatRange(entries[0].min, entries[0].max)} terms per problem</span>
) : (
<span>
{entries.map((e, i) => {
const pct = Math.round((comfortByMode[e.mode] ?? overallComfort) * 100)
return (
<span key={e.mode}>
{i > 0 && ' \u00b7 '}
{MODE_EMOJIS[e.mode]} {MODE_LABELS[e.mode]} {formatRange(e.min, e.max)} ({pct}%)
</span>
)
})}
</span>
)}
</div>
)
}
export function ProblemLengthSelector() {
const { resolvedTheme } = useTheme()
const isDark = resolvedTheme === 'dark'
const {
problemLengthPreference,
setProblemLengthPreference,
comfortLevel,
comfortByMode,
sessionMode,
enabledParts,
} = useStartPracticeModal()
// Compute per-mode term count ranges for each preference option
const ranges = useMemo(() => {
const result: Record<ProblemLengthPreference, Record<string, { min: number; max: number }>> = {
shorter: {},
recommended: {},
longer: {},
}
for (const pref of ['shorter', 'recommended', 'longer'] as ProblemLengthPreference[]) {
const adj = COMFORT_ADJUSTMENTS[pref]
result[pref] = computePerModeRanges(comfortByMode, comfortLevel, enabledParts, adj)
}
return result
}, [comfortLevel, comfortByMode, enabledParts])
const subtitle = getModeSubtitle(sessionMode.type)
const readinessPct = Math.round(comfortLevel * 100)
const modeReadiness = formatModeReadiness(comfortByMode, enabledParts)
// Check if the selected preference has differing ranges across modes —
// if so, readiness is shown inline in the range detail row, not the subtitle
const selectedRanges = ranges[problemLengthPreference]
const selectedEntries = MODE_ORDER.filter((m) => selectedRanges[m] !== undefined)
const rangesDiffer =
selectedEntries.length > 1 &&
!selectedEntries.every(
(m) =>
selectedRanges[m].min === selectedRanges[selectedEntries[0]].min &&
selectedRanges[m].max === selectedRanges[selectedEntries[0]].max
)
return (
<div data-setting="problem-length">
<div
data-element="problem-length-label"
className={css({
fontSize: '0.6875rem',
fontWeight: '600',
color: isDark ? 'gray.500' : 'gray.400',
textTransform: 'uppercase',
letterSpacing: '0.05em',
marginBottom: '0.5rem',
'@media (max-width: 480px), (max-height: 700px)': {
marginBottom: '0.25rem',
fontSize: '0.625rem',
},
})}
>
Problem length
</div>
<div
data-element="problem-length-options"
className={css({
display: 'flex',
gap: '0.25rem',
'@media (max-width: 480px), (max-height: 700px)': {
gap: '0.125rem',
},
})}
>
{OPTIONS.map(({ pref, label }) => {
const isSelected = problemLengthPreference === pref
return (
<button
key={pref}
type="button"
data-option={`length-${pref}`}
data-selected={isSelected}
onClick={() => setProblemLengthPreference(pref)}
className={css({
flex: 1,
padding: '0.5rem 0.25rem',
fontSize: '0.75rem',
fontWeight: '600',
borderRadius: '6px',
border: 'none',
cursor: 'pointer',
transition: 'all 0.15s ease',
lineHeight: '1.2',
'@media (max-width: 480px), (max-height: 700px)': {
padding: '0.3125rem 0.125rem',
fontSize: '0.6875rem',
borderRadius: '4px',
},
})}
style={{
backgroundColor: isSelected
? isDark
? '#8b5cf6'
: '#7c3aed'
: isDark
? 'rgba(255,255,255,0.06)'
: 'rgba(0,0,0,0.04)',
color: isSelected ? 'white' : isDark ? '#9ca3af' : '#6b7280',
}}
>
{label}
</button>
)
})}
</div>
{/* Per-mode range detail for selected preference */}
<SelectedRangeDetail
perModeRanges={selectedRanges}
comfortByMode={comfortByMode}
overallComfort={comfortLevel}
isDark={isDark}
/>
<Tooltip
content={
<MasteryScaleTooltipContent
comfortLevel={comfortLevel}
comfortByMode={comfortByMode}
sessionMode={sessionMode}
enabledParts={enabledParts}
ranges={ranges}
/>
}
side="bottom"
delayDuration={150}
>
<div
data-element="problem-length-subtitle"
className={css({
fontSize: '0.5625rem',
color: isDark ? 'gray.600' : 'gray.400',
marginTop: '0.375rem',
textAlign: 'center',
cursor: 'help',
'@media (max-width: 480px), (max-height: 700px)': {
marginTop: '0.25rem',
fontSize: '0.5rem',
},
})}
>
{rangesDiffer
? `${readinessPct}% readiness`
: (modeReadiness ?? `${readinessPct}% readiness`)}{' '}
· {subtitle} ⓘ
</div>
</Tooltip>
</div>
)
}
/** @deprecated Use ProblemLengthSelector instead */
export const MaxTermsSelector = ProblemLengthSelector
|