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import type { AlignmentConfig } from './renderPhiExploreImage'
const ALL_SUBJECTS = [
'fiddlehead',
'galaxy',
'hurricane',
'nautilus',
'pinecone',
'rams-horn',
'romanesco',
'sunflower',
'wave',
] as const
const DEFAULT_ALIGNMENT: AlignmentConfig = {
scale: 1,
rotation: 0,
offsetX: 0,
offsetY: 0,
}
type ThemeVariant = 'light' | 'dark'
interface AlignmentEntry {
light?: AlignmentConfig
dark?: AlignmentConfig
// legacy top-level fields
scale?: number
rotation?: number
offsetX?: number
offsetY?: number
}
type AlignmentJson = Record<string, AlignmentEntry>
export interface PhiCenteringMode {
enabled: boolean
subjectId: string
theme: ThemeVariant
alignment: AlignmentConfig
image: HTMLImageElement | null
allSubjects: readonly string[]
dirty: boolean
saving: boolean
setEnabled: (v: boolean) => void
setSubject: (id: string) => void
setTheme: (t: ThemeVariant) => void
updateAlignment: (partial: Partial<AlignmentConfig>) => void
resetAlignment: () => void
nextSubject: () => void
prevSubject: () => void
}
export function usePhiCenteringMode(resolvedTheme: string | undefined): PhiCenteringMode {
const [enabled, setEnabled] = useState(false)
const [subjectId, setSubjectIdRaw] = useState<string>(ALL_SUBJECTS[0])
const [theme, setThemeRaw] = useState<ThemeVariant>(resolvedTheme === 'dark' ? 'dark' : 'light')
const [alignment, setAlignment] = useState<AlignmentConfig>({ ...DEFAULT_ALIGNMENT })
const [image, setImage] = useState<HTMLImageElement | null>(null)
const [dirty, setDirty] = useState(false)
const [saving, setSaving] = useState(false)
const alignmentDataRef = useRef<AlignmentJson | null>(null)
const loadIdRef = useRef(0)
const saveTimerRef = useRef<ReturnType<typeof setTimeout> | null>(null)
const latestAlignmentRef = useRef(alignment)
latestAlignmentRef.current = alignment
// Load alignment.json once
useEffect(() => {
if (!enabled) return
if (alignmentDataRef.current) return // already loaded
let cancelled = false
async function load() {
try {
const res = await fetch(`/images/constants/phi-explore/alignment.json?t=${Date.now()}`)
if (!res.ok) return
const data = (await res.json()) as AlignmentJson
if (cancelled) return
alignmentDataRef.current = data
// Apply alignment for current subject+theme
const entry = data[subjectId]
if (entry?.[theme]) {
setAlignment({ ...entry[theme]! })
}
} catch {
// ignore
}
}
load()
return () => {
cancelled = true
}
// Only load once when enabled
// eslint-disable-next-line react-hooks/exhaustive-deps
}, [enabled])
// Load image when subject or theme changes
useEffect(() => {
if (!enabled) return
const id = ++loadIdRef.current
setImage(null)
const img = new Image()
img.crossOrigin = 'anonymous'
img.onload = () => {
if (id !== loadIdRef.current) return
setImage(img)
}
img.onerror = () => {
// ignore
}
img.src = `/images/constants/phi-explore/${subjectId}-${theme}.png`
// Also update alignment from cached data
const data = alignmentDataRef.current
if (data) {
const entry = data[subjectId]
if (entry?.[theme]) {
setAlignment({ ...entry[theme]! })
} else {
setAlignment({ ...DEFAULT_ALIGNMENT })
}
}
setDirty(false)
return () => {
loadIdRef.current++
}
}, [enabled, subjectId, theme])
// Debounced auto-save
const scheduleSave = useCallback(() => {
if (saveTimerRef.current) clearTimeout(saveTimerRef.current)
saveTimerRef.current = setTimeout(async () => {
const al = latestAlignmentRef.current
setSaving(true)
try {
const res = await fetch('/api/admin/constant-images/phi-explore/alignment', {
method: 'POST',
headers: { 'Content-Type': 'application/json' },
body: JSON.stringify({
subjectId,
theme,
alignment: al,
}),
})
if (res.ok) {
const data = (await res.json()) as AlignmentJson
alignmentDataRef.current = data
setDirty(false)
}
} catch {
// ignore
} finally {
setSaving(false)
}
}, 500)
}, [subjectId, theme])
// Cleanup save timer
useEffect(() => {
return () => {
if (saveTimerRef.current) clearTimeout(saveTimerRef.current)
}
}, [])
const updateAlignment = useCallback(
(partial: Partial<AlignmentConfig>) => {
setAlignment((prev) => {
const next = { ...prev, ...partial }
return next
})
setDirty(true)
scheduleSave()
},
[scheduleSave]
)
const resetAlignment = useCallback(() => {
setAlignment({ ...DEFAULT_ALIGNMENT })
setDirty(true)
scheduleSave()
}, [scheduleSave])
const setSubject = useCallback((id: string) => {
setSubjectIdRaw(id)
}, [])
const setTheme = useCallback((t: ThemeVariant) => {
setThemeRaw(t)
}, [])
const nextSubject = useCallback(() => {
const idx = ALL_SUBJECTS.indexOf(subjectId as (typeof ALL_SUBJECTS)[number])
const next = ALL_SUBJECTS[(idx + 1) % ALL_SUBJECTS.length]
setSubjectIdRaw(next)
}, [subjectId])
const prevSubject = useCallback(() => {
const idx = ALL_SUBJECTS.indexOf(subjectId as (typeof ALL_SUBJECTS)[number])
const prev = ALL_SUBJECTS[(idx - 1 + ALL_SUBJECTS.length) % ALL_SUBJECTS.length]
setSubjectIdRaw(prev)
}, [subjectId])
return {
enabled,
subjectId,
theme,
alignment,
image,
allSubjects: ALL_SUBJECTS,
dirty,
saving,
setEnabled,
setSubject,
setTheme,
updateAlignment,
resetAlignment,
nextSubject,
prevSubject,
}
}
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