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import type {
NavigationResult,
NavigationState,
NavigationHistoryEntry,
NavigationOptions,
HashNavigation
} from '#src/types';
import {
createHistoryEntry,
createNavigationResult,
getHash,
createHash
} from '#src/helpers';
/**
* Implementation of hash-based router core using Preact signals
* and following the Navigation API interface, while using window.history for compatibility
*/
export const createHashNavigation = (): HashNavigation => {
// Internal signals to manage router state
const _currentURL = signal<string>(window.location.href);
const _entries = signal<NavigationHistoryEntry[]>([createHistoryEntry(window.location.href)]);
const _currentIndex = signal<number>(0);
const _navigations = signal<Map<string, NavigationResult>>(new Map());
// Storage for active subscriptions
const _subscriptions = new Set<VoidFunction>();
// Public computed signals that reflect the router state
const currentEntry = computed(() => _entries.value[_currentIndex.value]);
const entries = computed(() => [..._entries.value]);
const canGoBack = computed(() => _currentIndex.value > 0);
const canGoForward = computed(() => _currentIndex.value < _entries.value.length - 1);
// Initialize the router state from the current location
const initializeFromLocation = (): void => {
// Try to get existing state from the history API
const state = window.history.state ?? currentEntry.value.state;
const initialEntry = createHistoryEntry(_currentURL.value, state);
// Using batch to update multiple signals at once
batch(() => {
_currentURL.value = initialEntry.url as string;
_entries.value = [initialEntry];
_currentIndex.value = 0;
});
};
// Handle hash change events from the window
const handleHashChange = (event: HashChangeEvent): void => {
// This is triggered by the browser, so we need to update our state
const newUrl = event.newURL;
const state = window.history.state;
// Check if this is a navigation we already know about
const existingEntryIndex = _entries.value.findIndex((entry) => entry.url === newUrl);
if(existingEntryIndex >= 0) {
// If we already have this entry, just update the index
_currentIndex.value = existingEntryIndex;
// Update state if it has changed
const existingEntry = _entries.value[existingEntryIndex];
if(JSON.stringify(existingEntry.state) !== JSON.stringify(state)) {
const updatedEntries = [..._entries.value];
updatedEntries[existingEntryIndex] = {
...existingEntry,
state,
};
_entries.value = updatedEntries;
}
} else {
// Otherwise, create a new entry
const newEntry = createHistoryEntry(newUrl, state, _entries.value.length);
const newEntries = [..._entries.value];
// If we navigated from a point in history, remove the forward entries
if(_currentIndex.value < _entries.value.length - 1) {
newEntries.splice(_currentIndex.value + 1);
}
newEntries.push(newEntry);
// Using batch to update multiple signals at once
batch(() => {
_entries.value = newEntries;
_currentIndex.value = newEntries.length - 1;
});
}
};
// Helper function to update navigation state
const updateNavigationState = (
destination: NavigationHistoryEntry,
newCurrentIndex: number,
newUrl?: string
): NavigationResult => {
// Create a navigation result
const result = createNavigationResult(destination);
// Store the navigation for potential future reference
const navigations = new Map(_navigations.value);
navigations.set(destination.key, result);
// Using batch to update multiple signals at once
batch(() => {
if(newUrl) {
_currentURL.value = newUrl;
}
_currentIndex.value = newCurrentIndex;
_navigations.value = navigations;
});
return result;
};
// Handle entry state updates
const updateEntryState = (
entryIndex: number,
newState: NavigationState | null | undefined
): NavigationHistoryEntry => {
const newEntries = [..._entries.value];
const entry = newEntries[entryIndex];
// Create updated entry with new state
const updatedEntry = {
...entry,
state: newState,
};
// Update our entries array
newEntries[entryIndex] = updatedEntry;
_entries.value = newEntries;
return updatedEntry;
};
const updateEntryUrl = (
entryIndex: number,
newUrl: string
): NavigationHistoryEntry => {
const newEntries = [..._entries.value];
const entry = newEntries[entryIndex];
// Create updated entry with new url
const updatedEntry = {
...entry,
url : newUrl,
hash: getHash(newUrl),
};
// Update our entries array
newEntries[entryIndex] = updatedEntry;
_entries.value = newEntries;
return updatedEntry;
};
const updateCurrentEntryHash = (hash: string) => {
return updateEntryUrl(
_currentIndex.value,
new URL(`#${createHash(hash)}`, window.location.href).href
);
};
/**
* Subscribe to navigation changes with current and previous history entries
* and current hash route
* @param callback - Callback function called when navigation changes
* @returns Unsubscribe function
*/
const subscribe = (
callback: (
entry: NavigationHistoryEntry,
prevEntry: NavigationHistoryEntry | null,
hash: string
) => void
): VoidFunction => {
// Get the current entry before setting up the effect
const current = currentEntry.value;
// Track the previous entry for change detection
// Initialize with current to avoid double call
let previousEntry: NavigationHistoryEntry | null = current;
// Call the callback with the current value on initial subscription
callback(current, null, current.hash);
// Create an effect that tracks changes in the currentEntry signal
const unsubscribe = effect(() => {
const entry = currentEntry.value;
const currentHash = entry.hash;
// Call the callback with current and previous entries
if(previousEntry !== entry) {
callback(entry, previousEntry, currentHash);
previousEntry = entry;
}
});
// Create a complete unsubscribe function that also removes the subscription from storage
const completeUnsubscribe = () => {
unsubscribe();
_subscriptions.delete(completeUnsubscribe);
};
// Save the subscription in storage
_subscriptions.add(completeUnsubscribe);
// Return the unsubscribe function
return completeUnsubscribe;
};
// Public API methods
const navigate = (hash: string, options: NavigationOptions = {}): NavigationResult => {
// Create full URL by resolving against current location
const originalHash = currentEntry.value.hash;
const fullUrl = new URL(`#${createHash(hash)}`, window.location.href).href;
// Only navigate if the hash part actually changed
if(originalHash !== hash) {
// Create a new destination with state from options
const destination = createHistoryEntry(fullUrl, options.state as NavigationState, _entries.value.length);
// Use history pushState to update the URL without reloading
window.history.pushState(options.state || null, '', fullUrl);
// Update our internal state
const newEntries = [..._entries.value];
// If we navigated from a point in history, remove the forward entries
if(_currentIndex.value < _entries.value.length - 1) {
newEntries.splice(_currentIndex.value + 1);
}
newEntries.push(destination);
// Using batch to update multiple signals at once
batch(() => {
_entries.value = newEntries;
_currentIndex.value = newEntries.length - 1;
_currentURL.value = fullUrl;
});
// Update navigation state
return updateNavigationState(destination, newEntries.length - 1);
} else {
// If hash didn't change, check if state changed
const currentEntryValue = currentEntry.value;
if(options.state && JSON.stringify(currentEntryValue.state) !== JSON.stringify(options.state)) {
// Update state without changing URL
window.history.replaceState(options.state, '', fullUrl);
const updatedEntry = updateEntryState(_currentIndex.value, options.state as NavigationState);
// Create and return a navigation result for the updated entry
return createNavigationResult(updatedEntry);
}
// If nothing changed, return a result that resolves immediately with current entry
return createNavigationResult(currentEntryValue);
}
};
const traverseTo = (key: string, options: NavigationOptions = {}): NavigationResult | null => {
const entryIndex = _entries.value.findIndex((entry) => entry.key === key);
if(entryIndex === -1) {
return null;
}
const destination = _entries.value[entryIndex];
const delta = entryIndex - _currentIndex.value;
// Handle potential state update if options include state
let updatedDestination = destination;
if(options.state) {
// Update history state and our entries
window.history.replaceState(options.state, '', destination.url);
updatedDestination = updateEntryState(entryIndex, options.state as NavigationState);
}
// Use history.go to navigate through history
window.history.go(delta);
// Update navigation state
return updateNavigationState(updatedDestination, entryIndex, updatedDestination.url);
};
const back = (options: NavigationOptions = {}): NavigationResult | null => {
if(!canGoBack.value) {
window.history.back();
return null;
}
const prevIndex = _currentIndex.value - 1;
let destination = _entries.value[prevIndex];
// Handle potential state update if options include state
if(options.state) {
// Update history state before going back
window.history.replaceState(options.state, '', destination.url);
destination = updateEntryState(prevIndex, options.state as NavigationState);
}
// Use history.back to navigate back
window.history.back();
// Update navigation state
return updateNavigationState(destination, prevIndex, destination.url);
};
const forward = (options: NavigationOptions = {}): NavigationResult | null => {
if(!canGoForward.value) {
return null;
}
const nextIndex = _currentIndex.value + 1;
let destination = _entries.value[nextIndex];
// Handle potential state update if options include state
if(options.state) {
// Update history state before going forward
window.history.replaceState(options.state, '', destination.url);
destination = updateEntryState(nextIndex, options.state as NavigationState);
}
// Use history.forward to navigate forward
window.history.forward();
// Update navigation state
return updateNavigationState(destination, nextIndex, destination.url);
};
const reload = (options: NavigationOptions = {}): NavigationResult => {
const currentEntryValue = currentEntry.value;
// Create a new destination to represent the reload, potentially with updated state
const state = options.state !== undefined ? options.state : currentEntryValue.state;
const destination = createHistoryEntry(currentEntryValue.url, state, currentEntryValue.index);
// Update history state if new state is provided
if(options.state !== undefined) {
window.history.replaceState(options.state, '', currentEntryValue.url);
updateEntryState(_currentIndex.value, options.state as NavigationState);
}
// Actually reload the current hash route
window.location.hash = getHash(currentEntryValue.url);
// Update navigation state
const result = createNavigationResult(destination);
// Store the navigation for potential future reference
const navigations = new Map(_navigations.value);
navigations.set(destination.key, result);
_navigations.value = navigations;
return result;
};
const updateCurrentEntry = (options: NavigationOptions = {}): void => {
const currentIndex = _currentIndex.value;
// Update the history state
window.history.replaceState(options.state || null, '', window.location.hash);
// Update entry state
updateEntryState(currentIndex, options.state as NavigationState || null);
};
// Set up effect to synchronize URL with current entry
const unsubscribe = effect(() => {
const currentEntryValue = currentEntry.value;
if(currentEntryValue && getHash(_currentURL.value) !== getHash(currentEntryValue.url as string)) {
_currentURL.value = currentEntryValue.url as string;
}
});
const create = () => {
// Initialize and set up event listeners
initializeFromLocation();
window.addEventListener('hashchange', handleHashChange);
};
const destroy = (): void => {
window.removeEventListener('hashchange', handleHashChange);
// Cancel all active subscriptions
_subscriptions.forEach((unsub) => unsub());
_subscriptions.clear();
// Cancel internal synchronization effect
unsubscribe();
};
// Return the public API
return {
// Public signals
currentEntry,
entries,
canGoBack,
canGoForward,
// Navigation methods
navigate,
traverseTo,
back,
forward,
reload,
updateCurrentEntry,
// Subscription method
subscribe,
// Service methods
updateCurrentEntryHash,
// Init
create,
// Cleanup
destroy,
};
};
// Export a singleton instance for convenience
export const hashNavigation = createHashNavigation();
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