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import { useState, useRef, useEffect, useCallback } from 'react'
import { css } from '../../../styled-system/css'
import { hstack, vstack } from '../../../styled-system/patterns'
import { KidNumberInput } from '@/components/ui/KidNumberInput'
import { useIsTouchDevice, useHasPhysicalKeyboard } from '@/hooks/useDeviceCapabilities'
interface FlowchartCheckpointProps {
prompt: string
inputType: 'number' | 'text' | 'two-numbers'
onSubmit: (value: number | string | [number, number]) => void
disabled?: boolean
/** Labels for two-numbers inputs */
inputLabels?: [string, string]
/** Feedback after validation */
feedback?: {
correct: boolean
expected?: number | string | [number, number]
userAnswer?: number | string | [number, number]
}
/** Hint to show after repeated failures */
hint?: string
/** Expected values for immediate per-field validation (optional) */
expectedValues?: number | [number, number]
/** Whether order matters for two-numbers validation (default: true) */
orderMatters?: boolean
}
/**
* Checkpoint node UI - number/text input with validation
*/
export function FlowchartCheckpoint({
prompt,
inputType,
onSubmit,
disabled = false,
inputLabels = ['First', 'Second'],
feedback,
hint,
expectedValues,
orderMatters = true,
}: FlowchartCheckpointProps) {
const [value, setValue] = useState('')
const [value1, setValue1] = useState('')
const [value2, setValue2] = useState('')
const [focusedInput, setFocusedInput] = useState<0 | 1>(0)
const input2Ref = useRef<HTMLInputElement>(null)
// Per-field feedback state (for immediate validation)
const [fieldFeedback, setFieldFeedback] = useState<{
first: 'none' | 'correct' | 'incorrect'
second: 'none' | 'correct' | 'incorrect'
}>({ first: 'none', second: 'none' })
// Smart keypad visibility - show on touch devices without physical keyboard
const isTouchDevice = useIsTouchDevice()
const hasPhysicalKeyboard = useHasPhysicalKeyboard()
// Show keypad only on touch devices without detected physical keyboard
// Default to showing keypad while detection is pending (hasPhysicalKeyboard === null)
const showOnScreenKeypad = isTouchDevice && hasPhysicalKeyboard !== true
// Handlers for single number input (KidNumberInput)
const handleDigit = useCallback(
(digit: string) => {
if (disabled || feedback) return
setValue((prev) => prev + digit)
},
[disabled, feedback]
)
const handleBackspace = useCallback(() => {
if (disabled || feedback) return
setValue((prev) => prev.slice(0, -1))
}, [disabled, feedback])
// Handlers for two-numbers input (first input)
const handleDigit1 = useCallback(
(digit: string) => {
if (disabled || feedback) return
setValue1((prev) => prev + digit)
},
[disabled, feedback]
)
const handleBackspace1 = useCallback(() => {
if (disabled || feedback) return
setValue1((prev) => prev.slice(0, -1))
}, [disabled, feedback])
// Handlers for two-numbers input (second input)
const handleDigit2 = useCallback(
(digit: string) => {
if (disabled || feedback) return
setValue2((prev) => prev + digit)
},
[disabled, feedback]
)
const handleBackspace2 = useCallback(() => {
if (disabled || feedback) return
setValue2((prev) => prev.slice(0, -1))
}, [disabled, feedback])
// Per-field validation helper for two-numbers input
const validateTwoNumbersField = useCallback(
(
fieldValue: string,
expected: [number, number],
fieldIndex: 0 | 1,
otherFieldValue: string
): 'correct' | 'incorrect' | 'pending' => {
if (!fieldValue.trim()) return 'pending'
const num = parseFloat(fieldValue)
if (Number.isNaN(num)) return 'pending'
// Get the expected value(s) based on which field
const expectedDigits = String(expected[fieldIndex]).length
// Don't validate until user has entered enough digits
if (fieldValue.length < expectedDigits) return 'pending'
if (orderMatters) {
// Simple ordered validation
return num === expected[fieldIndex] ? 'correct' : 'incorrect'
} else {
// Order-agnostic validation: either expected value is acceptable
// unless the other field already has it
const otherNum = parseFloat(otherFieldValue)
if (num === expected[0]) {
// Value matches first expected - correct unless other field already claimed it
return Number.isNaN(otherNum) || otherNum !== expected[0] ? 'correct' : 'incorrect'
}
if (num === expected[1]) {
// Value matches second expected - correct unless other field already claimed it
return Number.isNaN(otherNum) || otherNum !== expected[1] ? 'correct' : 'incorrect'
}
return 'incorrect'
}
},
[orderMatters]
)
// Per-field validation effect for first field (two-numbers)
useEffect(() => {
if (inputType !== 'two-numbers' || !expectedValues || disabled || feedback) return
if (!Array.isArray(expectedValues)) return
const result = validateTwoNumbersField(value1, expectedValues, 0, value2)
setFieldFeedback((prev) => ({
...prev,
first: result === 'pending' ? 'none' : result,
}))
// Auto-advance to second field when first is correct
if (result === 'correct' && focusedInput === 0) {
const timeout = setTimeout(() => setFocusedInput(1), 300)
return () => clearTimeout(timeout)
}
}, [
value1,
value2,
expectedValues,
inputType,
disabled,
feedback,
focusedInput,
validateTwoNumbersField,
])
// Per-field validation effect for second field (two-numbers)
useEffect(() => {
if (inputType !== 'two-numbers' || !expectedValues || disabled || feedback) return
if (!Array.isArray(expectedValues)) return
const result = validateTwoNumbersField(value2, expectedValues, 1, value1)
setFieldFeedback((prev) => ({
...prev,
second: result === 'pending' ? 'none' : result,
}))
// Auto-submit when both fields are correct
if (result === 'correct' && fieldFeedback.first === 'correct') {
const num1 = parseFloat(value1)
const num2 = parseFloat(value2)
if (!Number.isNaN(num1) && !Number.isNaN(num2)) {
const timeout = setTimeout(() => {
onSubmit([num1, num2])
}, 400)
return () => clearTimeout(timeout)
}
}
}, [
value1,
value2,
expectedValues,
inputType,
disabled,
feedback,
fieldFeedback.first,
validateTwoNumbersField,
onSubmit,
])
// Per-field validation for single number input
useEffect(() => {
if (inputType !== 'number' || typeof expectedValues !== 'number' || disabled || feedback) return
if (!value.trim()) {
setFieldFeedback({ first: 'none', second: 'none' })
return
}
const num = parseFloat(value)
if (Number.isNaN(num)) return
const expectedDigits = String(expectedValues).length
if (value.length < expectedDigits) {
setFieldFeedback({ first: 'none', second: 'none' })
return
}
const isCorrect = num === expectedValues
setFieldFeedback({ first: isCorrect ? 'correct' : 'incorrect', second: 'none' })
// Auto-submit when correct
if (isCorrect) {
const timeout = setTimeout(() => {
onSubmit(num)
}, 400)
return () => clearTimeout(timeout)
}
}, [value, expectedValues, inputType, disabled, feedback, onSubmit])
// Submit handler (must be defined before useEffect that uses it)
const handleSubmit = useCallback(() => {
if (inputType === 'two-numbers') {
if (!value1.trim() || !value2.trim()) return
const num1 = parseFloat(value1)
const num2 = parseFloat(value2)
if (!Number.isNaN(num1) && !Number.isNaN(num2)) {
onSubmit([num1, num2])
}
} else if (inputType === 'number') {
if (!value.trim()) return
const num = parseFloat(value)
if (!Number.isNaN(num)) {
onSubmit(num)
}
} else {
if (!value.trim()) return
onSubmit(value)
}
}, [inputType, value, value1, value2, onSubmit])
// Global keyboard handler for physical keyboard support (number inputs)
useEffect(() => {
if (inputType === 'text') return
const handleKeyDown = (e: KeyboardEvent) => {
if (disabled || feedback) return
if (/^[0-9]$/.test(e.key)) {
e.preventDefault()
if (inputType === 'number') {
handleDigit(e.key)
} else if (inputType === 'two-numbers') {
if (focusedInput === 0) {
handleDigit1(e.key)
} else {
handleDigit2(e.key)
}
}
} else if (e.key === 'Backspace') {
e.preventDefault()
if (inputType === 'number') {
handleBackspace()
} else if (inputType === 'two-numbers') {
if (focusedInput === 0) {
handleBackspace1()
} else {
handleBackspace2()
}
}
} else if (e.key === 'Enter') {
e.preventDefault()
if (inputType === 'two-numbers' && focusedInput === 0 && value1.trim()) {
// Move to second input on Enter
setFocusedInput(1)
} else {
handleSubmit()
}
} else if (e.key === 'Tab' && inputType === 'two-numbers') {
e.preventDefault()
setFocusedInput((prev) => (prev === 0 ? 1 : 0))
}
}
window.addEventListener('keydown', handleKeyDown)
return () => window.removeEventListener('keydown', handleKeyDown)
}, [
inputType,
disabled,
feedback,
focusedInput,
value1,
handleDigit,
handleBackspace,
handleDigit1,
handleBackspace1,
handleDigit2,
handleBackspace2,
handleSubmit,
])
// Auto-submit for two-numbers when both values are filled (fallback when no expectedValues)
useEffect(() => {
// Skip if per-field validation is active (it handles auto-submit)
if (expectedValues && Array.isArray(expectedValues)) return
if (inputType !== 'two-numbers' || disabled || feedback) return
const num1 = parseFloat(value1)
const num2 = parseFloat(value2)
// Only auto-submit if both are valid integers (denominators should be whole numbers)
if (
value1.trim() &&
value2.trim() &&
!Number.isNaN(num1) &&
!Number.isNaN(num2) &&
Number.isInteger(num1) &&
Number.isInteger(num2)
) {
// Small delay so the user sees what they typed
const timeout = setTimeout(() => {
onSubmit([num1, num2])
}, 150)
return () => clearTimeout(timeout)
}
}, [value1, value2, inputType, disabled, feedback, onSubmit, expectedValues])
const handleKeyDown = (e: React.KeyboardEvent, isFirstOfTwo?: boolean) => {
if (e.key === 'Enter') {
if (isFirstOfTwo && input2Ref.current) {
// Move to second input
input2Ref.current.focus()
} else {
handleSubmit()
}
}
}
const canSubmit = inputType === 'two-numbers' ? value1.trim() && value2.trim() : value.trim()
// Check which inputs are wrong for two-numbers feedback
const getTwoNumbersFeedback = () => {
if (!feedback || inputType !== 'two-numbers') return { first: null, second: null }
if (feedback.correct) return { first: true, second: true }
const expected = feedback.expected as [number, number]
const userAnswer = feedback.userAnswer as [number, number]
return {
first: userAnswer[0] === expected[0],
second: userAnswer[1] === expected[1],
}
}
const twoNumFeedback = getTwoNumbersFeedback()
const inputStyle = (isCorrect: boolean | null) =>
css({
width: '80px',
padding: '3',
fontSize: 'xl',
fontWeight: 'bold',
textAlign: 'center',
borderRadius: 'lg',
border: '2px solid',
borderColor:
isCorrect === null
? { base: 'gray.300', _dark: 'gray.600' }
: isCorrect
? { base: 'green.500', _dark: 'green.400' }
: { base: 'red.500', _dark: 'red.400' },
backgroundColor:
isCorrect === null
? { base: 'white', _dark: 'gray.800' }
: isCorrect
? { base: 'green.50', _dark: 'green.900' }
: { base: 'red.50', _dark: 'red.900' },
color: { base: 'gray.900', _dark: 'gray.100' },
outline: 'none',
_focus: {
borderColor: { base: 'blue.500', _dark: 'blue.400' },
boxShadow: '0 0 0 3px rgba(66, 153, 225, 0.3)',
},
_disabled: {
opacity: 0.7,
cursor: 'not-allowed',
},
})
return (
<div
data-testid="checkpoint-container"
data-input-type={inputType}
data-has-feedback={!!feedback}
data-feedback-correct={feedback?.correct}
className={vstack({ gap: '4', alignItems: 'center' })}
>
{/* Prompt */}
<p
data-testid="checkpoint-prompt"
className={css({
fontSize: 'lg',
fontWeight: 'medium',
color: { base: 'gray.800', _dark: 'gray.200' },
textAlign: 'center',
})}
>
{prompt}
</p>
{/* Input area */}
{inputType === 'two-numbers' ? (
<div data-testid="checkpoint-two-numbers-row" className={vstack({ gap: '4' })}>
{/* Two KidNumberInput displays (without keypads) */}
<div className={hstack({ gap: '4', alignItems: 'flex-start' })}>
{/* First input with label */}
<div
data-testid="checkpoint-input-1-wrapper"
onClick={() => setFocusedInput(0)}
className={vstack({
gap: '1',
alignItems: 'center',
cursor: 'pointer',
})}
>
<label
className={css({
fontSize: 'sm',
color: { base: 'gray.600', _dark: 'gray.400' },
fontWeight: 'medium',
})}
>
{inputLabels[0]}
</label>
<div
className={css({
outline: focusedInput === 0 ? '3px solid' : 'none',
outlineColor: { base: 'blue.400', _dark: 'blue.500' },
outlineOffset: '2px',
borderRadius: 'xl',
})}
>
<KidNumberInput
value={value1}
onDigit={handleDigit1}
onBackspace={handleBackspace1}
disabled={disabled || !!feedback}
feedback={
feedback
? twoNumFeedback.first
? 'correct'
: 'incorrect'
: fieldFeedback.first
}
showKeypad={false}
displaySize="md"
placeholder="?"
/>
</div>
</div>
<span
className={css({
fontSize: '2xl',
fontWeight: 'bold',
color: { base: 'gray.400', _dark: 'gray.500' },
marginTop: '8', // Align with inputs (below labels)
})}
>
and
</span>
{/* Second input with label */}
<div
data-testid="checkpoint-input-2-wrapper"
onClick={() => setFocusedInput(1)}
className={vstack({
gap: '1',
alignItems: 'center',
cursor: 'pointer',
})}
>
<label
className={css({
fontSize: 'sm',
color: { base: 'gray.600', _dark: 'gray.400' },
fontWeight: 'medium',
})}
>
{inputLabels[1]}
</label>
<div
className={css({
outline: focusedInput === 1 ? '3px solid' : 'none',
outlineColor: { base: 'blue.400', _dark: 'blue.500' },
outlineOffset: '2px',
borderRadius: 'xl',
})}
>
<KidNumberInput
value={value2}
onDigit={handleDigit2}
onBackspace={handleBackspace2}
disabled={disabled || !!feedback}
feedback={
feedback
? twoNumFeedback.second
? 'correct'
: 'incorrect'
: fieldFeedback.second
}
showKeypad={false}
displaySize="md"
placeholder="?"
/>
</div>
</div>
</div>
{/* Shared inline keypad for two-numbers - only show on touch devices without keyboard */}
{showOnScreenKeypad && (
<div className={css({ width: '100%', maxWidth: '320px' })}>
<KidNumberInput
value=""
onDigit={focusedInput === 0 ? handleDigit1 : handleDigit2}
onBackspace={focusedInput === 0 ? handleBackspace1 : handleBackspace2}
disabled={disabled || !!feedback}
showKeypad={true}
keypadMode="inline"
displaySize="sm"
placeholder=""
/>
</div>
)}
</div>
) : inputType === 'number' ? (
/* Number input with KidNumberInput */
<div
data-testid="checkpoint-input-row"
className={vstack({ gap: '4', alignItems: 'center' })}
>
<KidNumberInput
value={value}
onDigit={handleDigit}
onBackspace={handleBackspace}
disabled={disabled || !!feedback}
feedback={feedback ? (feedback.correct ? 'correct' : 'incorrect') : fieldFeedback.first}
showKeypad={showOnScreenKeypad}
keypadMode="inline"
displaySize="lg"
placeholder="?"
/>
<button
data-testid="checkpoint-check-button"
onClick={handleSubmit}
disabled={disabled || !value.trim()}
className={css({
paddingY: '4',
paddingX: '8',
fontSize: 'xl',
fontWeight: 'bold',
borderRadius: 'xl',
backgroundColor: { base: 'blue.500', _dark: 'blue.600' },
color: 'white',
cursor: 'pointer',
transition: 'all 0.2s',
_hover: {
backgroundColor: { base: 'blue.600', _dark: 'blue.500' },
transform: 'scale(1.02)',
},
_active: {
transform: 'scale(0.98)',
},
_disabled: {
opacity: 0.5,
cursor: 'not-allowed',
_hover: {
transform: 'none',
},
},
})}
>
Check
</button>
</div>
) : (
/* Text input - keep native input */
<div data-testid="checkpoint-input-row" className={hstack({ gap: '3' })}>
<input
data-testid="checkpoint-input"
type="text"
value={value}
onChange={(e) => setValue(e.target.value)}
onKeyDown={(e) => handleKeyDown(e)}
disabled={disabled}
// biome-ignore lint/a11y/noAutofocus: focus input on modal open
autoFocus
className={css({
width: '120px',
padding: '3',
fontSize: 'xl',
fontWeight: 'bold',
textAlign: 'center',
borderRadius: 'lg',
border: '2px solid',
borderColor: feedback
? feedback.correct
? { base: 'green.500', _dark: 'green.400' }
: { base: 'red.500', _dark: 'red.400' }
: { base: 'gray.300', _dark: 'gray.600' },
backgroundColor: feedback
? feedback.correct
? { base: 'green.50', _dark: 'green.900' }
: { base: 'red.50', _dark: 'red.900' }
: { base: 'white', _dark: 'gray.800' },
color: { base: 'gray.900', _dark: 'gray.100' },
outline: 'none',
_focus: {
borderColor: { base: 'blue.500', _dark: 'blue.400' },
boxShadow: '0 0 0 3px rgba(66, 153, 225, 0.3)',
},
_disabled: {
opacity: 0.7,
cursor: 'not-allowed',
},
})}
/>
<button
data-testid="checkpoint-check-button"
onClick={handleSubmit}
disabled={disabled || !value.trim()}
className={css({
paddingY: '3',
paddingX: '5',
fontSize: 'lg',
fontWeight: 'semibold',
borderRadius: 'lg',
backgroundColor: { base: 'blue.500', _dark: 'blue.600' },
color: 'white',
cursor: 'pointer',
transition: 'all 0.2s',
_hover: {
backgroundColor: { base: 'blue.600', _dark: 'blue.500' },
},
_disabled: {
opacity: 0.5,
cursor: 'not-allowed',
},
})}
>
Check
</button>
</div>
)}
{/* Feedback */}
{feedback && (
<div
data-testid="checkpoint-feedback"
data-feedback-correct={feedback.correct}
data-expected={
Array.isArray(feedback.expected) ? feedback.expected.join(',') : feedback.expected
}
data-user-answer={
Array.isArray(feedback.userAnswer) ? feedback.userAnswer.join(',') : feedback.userAnswer
}
className={css({
paddingY: '3',
paddingX: '4',
borderRadius: 'md',
backgroundColor: feedback.correct
? { base: 'green.100', _dark: 'green.800' }
: { base: 'red.100', _dark: 'red.800' },
color: feedback.correct
? { base: 'green.800', _dark: 'green.200' }
: { base: 'red.800', _dark: 'red.200' },
fontSize: 'md',
fontWeight: 'medium',
})}
>
{feedback.correct ? (
<span>Correct!</span>
) : inputType === 'two-numbers' ? (
<span>
Not quite.
{!twoNumFeedback.first && (
<> First should be {(feedback.expected as [number, number])[0]}.</>
)}
{!twoNumFeedback.second && (
<> Second should be {(feedback.expected as [number, number])[1]}.</>
)}
</span>
) : (
<span>
Not quite. You entered {String(feedback.userAnswer)}, but the answer is{' '}
{String(feedback.expected)}.
</span>
)}
</div>
)}
{/* Hint */}
{hint && (
<div
data-testid="checkpoint-hint"
className={css({
paddingY: '3',
paddingX: '4',
borderRadius: 'md',
backgroundColor: { base: 'purple.100', _dark: 'purple.800' },
color: { base: 'purple.800', _dark: 'purple.200' },
fontSize: 'sm',
})}
>
{hint}
</div>
)}
</div>
)
}
|