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import { h, hydrate, render } from 'preact';
import StaticHtml from './static-html.js';
import type { SignalLike } from './types.js';
const sharedSignalMap = new Map<string, SignalLike>();
export default (element: HTMLElement) =>
async (
Component: any,
props: Record<string, any>,
{ default: children, ...slotted }: Record<string, any>,
{ client }: Record<string, string>,
) => {
if (!element.hasAttribute('ssr')) return;
for (const [key, value] of Object.entries(slotted)) {
props[key] = h(StaticHtml, { value, name: key });
}
let signalsRaw = element.dataset.preactSignals;
if (signalsRaw) {
const { signal } = await import('@preact/signals');
let signals: Record<string, string | [string, number][]> = JSON.parse(
element.dataset.preactSignals!,
);
for (const [propName, signalId] of Object.entries(signals)) {
if (Array.isArray(signalId)) {
signalId.forEach(([id, indexOrKeyInProps]) => {
const mapValue = props[propName][indexOrKeyInProps];
let valueOfSignal = mapValue;
// not an property key
if (typeof indexOrKeyInProps !== 'string') {
valueOfSignal = mapValue[0];
indexOrKeyInProps = mapValue[1];
}
if (!sharedSignalMap.has(id)) {
const signalValue = signal(valueOfSignal);
sharedSignalMap.set(id, signalValue);
}
props[propName][indexOrKeyInProps] = sharedSignalMap.get(id);
});
} else {
if (!sharedSignalMap.has(signalId)) {
const signalValue = signal(props[propName]);
sharedSignalMap.set(signalId, signalValue);
}
props[propName] = sharedSignalMap.get(signalId);
}
}
}
const child = h(
Component,
props,
children != null ? h(StaticHtml, { value: children }) : children,
);
if (client === 'only') {
element.innerHTML = '';
render(child, element);
} else {
hydrate(child, element);
}
// Preact has no "unmount" option, but you can use `render(null, element)`
element.addEventListener('astro:unmount', () => render(null, element), { once: true });
};
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