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| 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 | 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x | /**
* Letter Display Component
*
* Renders a region name with letter-by-letter confirmation highlighting.
* Used in Learning mode to show which letters have been confirmed,
* which letter is next, and which are pending.
*
* Visual states:
* - Confirmed: Full opacity
* - Next: Full opacity with underline
* - Pending: Dimmed (40% opacity)
* - Beyond required: Full opacity (no confirmation needed)
* - Spaces: Always full opacity
*/
'use client'
import { memo, useMemo } from 'react'
import type { LetterDisplayProps, LetterStatus } from './types'
import { getLetterStatus, getLetterStyles } from './letterUtils'
/**
* Renders a single letter with appropriate styling based on confirmation status.
*/
interface StyledLetterProps {
char: string
status: LetterStatus | 'space'
isDark: boolean
index: number
}
const StyledLetter = memo(function StyledLetter({
char,
status,
isDark,
index,
}: StyledLetterProps) {
// Spaces are always shown at full opacity
if (status === 'space') {
return (
<span key={index} style={{ transition: 'all 0.15s ease-out' }}>
{char}
</span>
)
}
const styles = getLetterStyles(status, isDark)
return (
<span key={index} style={styles}>
{char}
</span>
)
})
/**
* Renders a region name with letter confirmation highlighting.
*
* This component handles:
* - Splitting the name into individual characters
* - Tracking non-space letter indices
* - Applying appropriate styles based on confirmation progress
*
* @example
* ```tsx
* <LetterDisplay
* regionName="United States"
* requiredLetters={3}
* confirmedCount={2}
* isComplete={false}
* isDark={true}
* />
* // Renders: "Un" at full opacity, "i" underlined, "ted States" dimmed
* ```
*/
export const LetterDisplay = memo(function LetterDisplay({
regionName,
requiredLetters,
confirmedCount,
isComplete,
isDark,
fontSize,
style,
}: LetterDisplayProps) {
// Calculate letter statuses and render elements
const letterElements = useMemo(() => {
let nonSpaceIndex = 0
return regionName.split('').map((char, index) => {
const isSpace = char === ' '
if (isSpace) {
return <StyledLetter key={index} char={char} status="space" isDark={isDark} index={index} />
}
// Get current index before incrementing
const currentNonSpaceIndex = nonSpaceIndex
nonSpaceIndex++
// Determine letter status
const status = getLetterStatus(
currentNonSpaceIndex,
confirmedCount,
requiredLetters,
isComplete
)
return <StyledLetter key={index} char={char} status={status} isDark={isDark} index={index} />
})
}, [regionName, confirmedCount, requiredLetters, isComplete, isDark])
return (
<span
style={{
fontSize,
...style,
}}
>
{letterElements}
</span>
)
})
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