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import {
createContext,
useCallback,
useContext,
useEffect,
useMemo,
useRef,
useState,
type ReactNode,
} from 'react'
import type { SessionMode } from '@/lib/curriculum/session-mode'
import type { ActiveSessionState } from '@/components/practice/ActiveSessionBanner'
// ============================================================================
// Types
// ============================================================================
export type BannerSlot = 'content' | 'nav' | 'hidden'
// Re-export for convenience
export type { ActiveSessionState } from '@/components/practice/ActiveSessionBanner'
export interface SlotBounds {
x: number
y: number
width: number
height: number
}
export interface SlotDimensions {
width: number
height: number
}
interface SessionModeBannerContextValue {
// Which slot is currently active (computed from registered slots + visibility)
activeSlot: BannerSlot
// Slot registration - components call these to register/unregister
registerContentSlot: () => void
unregisterContentSlot: () => void
registerNavSlot: () => void
unregisterNavSlot: () => void
// Bounds reporting - slots report their position
setContentBounds: (bounds: SlotBounds | null) => void
setNavBounds: (bounds: SlotBounds | null) => void
// Dimensions reporting - slots report their measured content size
setContentDimensions: (dimensions: SlotDimensions | null) => void
setNavDimensions: (dimensions: SlotDimensions | null) => void
contentDimensions: SlotDimensions | null
navDimensions: SlotDimensions | null
// Visibility reporting - content slot reports when scrolled out of view
setContentSlotVisible: (visible: boolean) => void
// Current target bounds for the banner (from active slot)
targetBounds: SlotBounds | null
// Session mode data
sessionMode: SessionMode | null
isLoading: boolean
// Active session state (if there's an in-progress session)
activeSession: ActiveSessionState | null
// Action callbacks
onAction: () => void
setOnAction: (callback: () => void) => void
onDefer: () => void
setOnDefer: (callback: () => void) => void
onResume: () => void
setOnResume: (callback: () => void) => void
onStartFresh: () => void
setOnStartFresh: (callback: () => void) => void
// Skip animation on rapid navigation
shouldAnimate: boolean
}
const SessionModeBannerContext = createContext<SessionModeBannerContextValue | null>(null)
// ============================================================================
// Provider
// ============================================================================
interface SessionModeBannerProviderProps {
children: ReactNode
sessionMode: SessionMode | null
isLoading: boolean
activeSession?: ActiveSessionState | null
}
export function SessionModeBannerProvider({
children,
sessionMode,
isLoading,
activeSession = null,
}: SessionModeBannerProviderProps) {
// Track which slots are currently registered
const [contentSlotCount, setContentSlotCount] = useState(0)
const [navSlotCount, setNavSlotCount] = useState(0)
// Track bounds from each slot
const [contentBounds, setContentBoundsState] = useState<SlotBounds | null>(null)
const [navBounds, setNavBoundsState] = useState<SlotBounds | null>(null)
// Track measured dimensions from each slot's content
const [contentDimensions, setContentDimensionsState] = useState<SlotDimensions | null>(null)
const [navDimensions, setNavDimensionsState] = useState<SlotDimensions | null>(null)
// Track content slot visibility (for scroll-based projection)
const [isContentSlotVisible, setContentSlotVisibleState] = useState(true)
// Track last slot change time for animation skipping
const lastSlotChangeRef = useRef<number>(0)
const [shouldAnimate, setShouldAnimate] = useState(true)
// Compute active slot based on which slots are registered AND visibility
// Priority: content (if visible) > nav > hidden
// When content slot scrolls under nav, project to nav slot
const activeSlot: BannerSlot =
contentSlotCount > 0 && isContentSlotVisible ? 'content' : navSlotCount > 0 ? 'nav' : 'hidden'
// Compute target bounds based on active slot
const targetBounds =
activeSlot === 'content' ? contentBounds : activeSlot === 'nav' ? navBounds : null
// When slot changes, check if we should animate
const previousSlotRef = useRef<BannerSlot>(activeSlot)
useEffect(() => {
if (previousSlotRef.current !== activeSlot) {
const now = Date.now()
const timeSinceLastChange = now - lastSlotChangeRef.current
// Skip animation if navigating rapidly (< 300ms between changes)
setShouldAnimate(timeSinceLastChange > 300)
lastSlotChangeRef.current = now
previousSlotRef.current = activeSlot
}
}, [activeSlot])
// Registration callbacks
const registerContentSlot = useCallback(() => {
setContentSlotCount((c) => c + 1)
}, [])
const unregisterContentSlot = useCallback(() => {
setContentSlotCount((c) => Math.max(0, c - 1))
}, [])
const registerNavSlot = useCallback(() => {
setNavSlotCount((c) => c + 1)
}, [])
const unregisterNavSlot = useCallback(() => {
setNavSlotCount((c) => Math.max(0, c - 1))
}, [])
// Bounds setters (wrapped for stability)
const setContentBounds = useCallback((bounds: SlotBounds | null) => {
setContentBoundsState(bounds)
}, [])
const setNavBounds = useCallback((bounds: SlotBounds | null) => {
setNavBoundsState(bounds)
}, [])
// Dimensions setters (for measured content size)
const setContentDimensions = useCallback((dimensions: SlotDimensions | null) => {
setContentDimensionsState(dimensions)
}, [])
const setNavDimensions = useCallback((dimensions: SlotDimensions | null) => {
setNavDimensionsState(dimensions)
}, [])
// Visibility setter (for scroll-based projection)
const setContentSlotVisible = useCallback((visible: boolean) => {
setContentSlotVisibleState(visible)
}, [])
// Action callback refs (to avoid re-renders when callbacks change)
const onActionRef = useRef<() => void>(() => {})
const onDeferRef = useRef<() => void>(() => {})
const onResumeRef = useRef<() => void>(() => {})
const onStartFreshRef = useRef<() => void>(() => {})
const onAction = useCallback(() => {
onActionRef.current()
}, [])
const setOnAction = useCallback((callback: () => void) => {
onActionRef.current = callback
}, [])
const onDefer = useCallback(() => {
onDeferRef.current()
}, [])
const setOnDefer = useCallback((callback: () => void) => {
onDeferRef.current = callback
}, [])
const onResume = useCallback(() => {
onResumeRef.current()
}, [])
const setOnResume = useCallback((callback: () => void) => {
onResumeRef.current = callback
}, [])
const onStartFresh = useCallback(() => {
onStartFreshRef.current()
}, [])
const setOnStartFresh = useCallback((callback: () => void) => {
onStartFreshRef.current = callback
}, [])
const value = useMemo(
() => ({
activeSlot,
registerContentSlot,
unregisterContentSlot,
registerNavSlot,
unregisterNavSlot,
setContentBounds,
setNavBounds,
setContentDimensions,
setNavDimensions,
contentDimensions,
navDimensions,
setContentSlotVisible,
targetBounds,
sessionMode,
isLoading,
activeSession,
onAction,
setOnAction,
onDefer,
setOnDefer,
onResume,
setOnResume,
onStartFresh,
setOnStartFresh,
shouldAnimate,
}),
[
activeSlot,
registerContentSlot,
unregisterContentSlot,
registerNavSlot,
unregisterNavSlot,
setContentBounds,
setNavBounds,
setContentDimensions,
setNavDimensions,
contentDimensions,
navDimensions,
setContentSlotVisible,
targetBounds,
sessionMode,
isLoading,
activeSession,
onAction,
setOnAction,
onDefer,
setOnDefer,
onResume,
setOnResume,
onStartFresh,
setOnStartFresh,
shouldAnimate,
]
)
return (
<SessionModeBannerContext.Provider value={value}>{children}</SessionModeBannerContext.Provider>
)
}
// ============================================================================
// Hooks
// ============================================================================
/**
* Hook to access the session mode banner context.
* Throws if used outside SessionModeBannerProvider.
*/
export function useSessionModeBanner() {
const context = useContext(SessionModeBannerContext)
if (!context) {
throw new Error('useSessionModeBanner must be used within SessionModeBannerProvider')
}
return context
}
/**
* Optional hook that returns null if used outside SessionModeBannerProvider.
* Use this in components that need to work both with and without the provider.
*/
export function useSessionModeBannerOptional() {
return useContext(SessionModeBannerContext)
}
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