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import { deriveScope } from '../reactive/scopeProxy.js';
import { unescapeTemplateMarkers } from '../utils/templateUtils.js';
/**
* Manages deferred loading (<@defer>) of DOM subtrees and component instances.
*/
export class DeferManager {
/** @type {WeakSet<Element>} */
#initialized = new WeakSet();
/** @type {WeakSet<Element>} */
#loaded = new WeakSet();
/** @type {WeakMap<Element, Function>} */
#cleanups = new WeakMap();
/**
* @param {DynamicEvaluator} evaluator - Expression evaluator.
* @param {TemplateRenderer} renderer - Template renderer.
* @param {EventBinder} [eventBinder] - Event binder.
* @param {string} [componentName] - Parent component name.
*/
constructor(evaluator, renderer, eventBinder, componentName) {
this.evaluator = evaluator;
this.renderer = renderer;
this.eventBinder = eventBinder;
this.componentName = componentName || 'AnonymousComponent';
this.patcher = new DomPatcher();
}
/**
* Checks if a container element has already loaded its deferred content.
* @param {Element} el
* @returns {boolean}
*/
isLoaded(el) {
return this.#loaded.has(el);
}
/**
* Processes all [data-ax-defer] container elements within a root element.
* @param {Element} root - Root container or component element.
* @param {object} scope - Evaluation scope.
* @param {object} state - Component state.
*/
process(root, scope, state) {
if (!root) return;
const containers = [];
if (root.matches && root.matches('[data-ax-defer]')) {
containers.push(root);
}
if (root.querySelectorAll) {
root.querySelectorAll('[data-ax-defer]').forEach((el) => containers.push(el));
}
containers.forEach((container) => {
this.#processContainer(container, scope, state);
});
}
/**
* Processes an individual [data-ax-defer] container element.
* @param {Element} container
* @param {object} scope
* @param {object} state
* #private
*/
#processContainer(container, scope, state) {
if (this.#loaded.has(container)) return;
// Initialize placeholder content if not done yet
if (!this.#initialized.has(container)) {
this.#initialized.add(container);
const placeholderTpl = container.querySelector('template[data-ax-defer-placeholder]');
if (placeholderTpl && container.children.length === container.querySelectorAll('template').length) {
const placeholderContent = unescapeTemplate(placeholderTpl.innerHTML);
const renderedPlaceholder = this.renderer.render(placeholderContent, scope);
const tempDiv = document.createElement('div');
tempDiv.innerHTML = renderedPlaceholder;
while (tempDiv.firstChild) {
container.insertBefore(tempDiv.firstChild, placeholderTpl);
}
}
}
const whenAttr = (container.getAttribute('data-ax-defer-when') || 'idle').trim();
this.setupTrigger(container, whenAttr, scope, state);
}
/**
* Sets up trigger conditions based on whenAttr.
* @param {Element} container
* @param {string} whenAttr
* @param {object} scope
* @param {object} state
*/
setupTrigger(container, whenAttr, scope, state) {
if (this.#loaded.has(container)) return;
const normalizedWhen = whenAttr.toLowerCase();
if (normalizedWhen === 'idle') {
this.#setupIdleTrigger(container, scope);
} else if (normalizedWhen === 'visible') {
this.#setupVisibleTrigger(container, scope);
} else if (normalizedWhen === 'interaction' || normalizedWhen === 'hover' || normalizedWhen === 'click') {
this.#setupInteractionTrigger(container, scope);
} else if (normalizedWhen.startsWith('timer(') || normalizedWhen.endsWith('ms')) {
this.#setupTimerTrigger(container, whenAttr, scope);
} else {
this.#setupExpressionTrigger(container, whenAttr, scope, state);
}
}
/**
* Triggers deferred loading on user interaction (click or mouseenter).
* @param {Element} container - Target container element.
* @param {object} scope - Evaluation scope.
*/
#setupInteractionTrigger(container, scope) {
const handler = () => {
container.removeEventListener('click', handler);
container.removeEventListener('mouseenter', handler);
this.loadDeferredContent(container, scope);
};
container.addEventListener('click', handler);
container.addEventListener('mouseenter', handler);
this.registerCleanup(container, () => {
container.removeEventListener('click', handler);
container.removeEventListener('mouseenter', handler);
});
}
/**
* Triggers deferred loading after a timer delay in ms (e.g. timer(1000) or 1000ms).
* @param {Element} container - Target container element.
* @param {string} whenAttr - Raw trigger attribute value.
* @param {object} scope - Evaluation scope.
*/
#setupTimerTrigger(container, whenAttr, scope) {
const match = whenAttr.match(/(\d+)/);
const delay = match ? parseInt(match[1], 10) : 1000;
const timer = setTimeout(() => {
this.loadDeferredContent(container, scope);
}, delay);
this.registerCleanup(container, () => clearTimeout(timer));
}
/**
* Triggers deferred loading when a reactive condition expression evaluates to true.
* @param {Element} container - Target container element.
* @param {string} whenAttr - Expression string to evaluate.
* @param {object} scope - Evaluation scope.
* @param {object} state - Component state.
*/
#setupExpressionTrigger(container, whenAttr, scope, state) {
try {
const evalScope = deriveScope(scope, { state });
const evalResult = this.evaluator
? this.evaluator.evaluateExpression(whenAttr, evalScope, state)
: Boolean(state && state[whenAttr]);
if (evalResult) {
this.loadDeferredContent(container, scope);
}
} catch {
// Evaluation failed, ignore
}
}
/**
* Triggers deferred loading during browser idle time (requestIdleCallback).
* @param {Element} container - Target container element.
* @param {object} scope - Evaluation scope.
*/
#setupIdleTrigger(container, scope) {
if (typeof window !== 'undefined' && 'requestIdleCallback' in window) {
const handle = window.requestIdleCallback(() => {
this.loadDeferredContent(container, scope);
});
this.registerCleanup(container, () => {
if ('cancelIdleCallback' in window) {
window.cancelIdleCallback(handle);
}
});
} else {
const timer = setTimeout(() => {
this.loadDeferredContent(container, scope);
}, 1);
this.registerCleanup(container, () => clearTimeout(timer));
}
}
/**
* Triggers deferred loading when element becomes visible in viewport (IntersectionObserver).
* @param {Element} container - Target container element.
* @param {object} scope - Evaluation scope.
*/
#setupVisibleTrigger(container, scope) {
if (typeof window !== 'undefined' && 'IntersectionObserver' in window) {
const observer = new IntersectionObserver(
(entries) => {
entries.forEach((entry) => {
if (entry.isIntersecting) {
observer.disconnect();
this.loadDeferredContent(container, scope);
}
});
},
{ threshold: 0.1 }
);
observer.observe(container);
this.registerCleanup(container, () => observer.disconnect());
} else {
// Fallback if IntersectionObserver is not available
this.loadDeferredContent(container, scope);
}
}
/**
* Swaps placeholder with deferred content.
* @param {Element} container - Target container element.
* @param {object} scope - Evaluation scope.
*/
loadDeferredContent(container, scope) {
if (this.#loaded.has(container)) return;
this.#loaded.add(container);
// Run cleanup if any trigger listener was set
const cleanup = this.#cleanups.get(container);
if (cleanup) {
cleanup();
this.#cleanups.delete(container);
}
const contentTpl = container.querySelector('template[data-ax-defer-content]');
if (!contentTpl) return;
const unescapedContent = unescapeTemplate(contentTpl.innerHTML);
const renderedHtml = this.renderer.render(unescapedContent, scope);
// Clear placeholder children (keep templates)
Array.from(container.childNodes).forEach((child) => {
if (child.nodeName !== 'TEMPLATE') {
if (this.eventBinder && child.nodeType === 1) {
this.eventBinder.unbind(child);
}
container.removeChild(child);
}
});
// Mount newly rendered deferred content
const tempDiv = document.createElement('div');
tempDiv.innerHTML = renderedHtml;
const fragment = document.createDocumentFragment();
while (tempDiv.firstChild) {
fragment.appendChild(tempDiv.firstChild);
}
container.insertBefore(fragment, contentTpl);
// Bind events if eventBinder is available
if (this.eventBinder) {
this.eventBinder.bind(container, scope);
}
}
/**
* Registers a cleanup function for a container.
* @param {Element} container
* @param {Function} cleanupFn
*/
registerCleanup(container, cleanupFn) {
this.#cleanups.set(container, cleanupFn);
}
/**
* Destroys and cleans up all observers and listeners.
*/
destroy() {
// Cleanup handlers
}
}
/**
* Restores escaped template expressions from {% %} back to {{ }}.
* @param {string} html
* @returns {string}
*/
function unescapeTemplate(html) {
if (!html) return '';
return unescapeTemplateMarkers(html);
}
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