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import React from 'react';
import { AppCtx } from '@tao.js/core';
import { noop, normalizeClean } from './helpers';
/** @typedef {import('@tao.js/core').Kernel} Kernel */
/** @typedef {import('@tao.js/core').Handler} Handler */
/** @typedef {import('./helpers').TrigramProps} TrigramProps */
/** @typedef {import('./helpers').NormalizedTrigram} NormalizedTrigram */
/** @typedef {import('./helpers').TaoSignal} TaoSignal */
/**
* Snapshot of the latest matched component handler, rendered by `Reactor`.
* @typedef {Object} AdapterCurrent
* @property {import('react').ComponentType<*>|null} ComponentHandler - the
* component registered for the matched trigram (`null` renders
* nothing)
* @property {TaoSignal} tao - trigram of the AppCon that fired
* @property {Object<string, *>} props - registration props merged with the
* AppCon data
*/
/**
* @param {import('react').ComponentType<*>|null} ComponentHandler
* @param {Object<string, *>} props
* @param {Adapter} _adapter
* @returns {Handler}
*/
const wrappedHandler =
(ComponentHandler = null, props, _adapter) =>
(tao, data) => {
_adapter._current = {
ComponentHandler,
tao,
props: {
...props,
...data,
},
};
_adapter._reactors.forEach((notify) => notify());
};
/**
* Original ("orig" entry) API: registers React components as inline handlers
* on a Kernel and tracks the latest match for a `Reactor` to render.
* Legacy — prefer the current component/hook API from the package root.
*/
class Adapter {
/**
* @param {Kernel} TAO - the Kernel to register inline handlers on
*/
constructor(TAO) {
this._tao = TAO;
/** @type {?AdapterCurrent} */
this._current = null;
/** @type {NormalizedTrigram} */
this._default = {};
/** @type {Map<object, () => void>} */
this._reactors = new Map();
/** @type {Map<*, {handlers: Map<AppCtx, Handler>, index: Map<string, AppCtx>}>} */
this._components = new Map();
}
/**
* The latest matched component snapshot, or `null` before any match.
* @returns {?AdapterCurrent}
*/
get current() {
return this._current;
}
/**
* Copy of the default trigram parts merged under every add/remove call.
* @returns {NormalizedTrigram}
*/
get defaultCtx() {
return { ...this._default };
}
/**
* Set the default trigram parts (short/long keys, arrays allowed;
* assigning `undefined` resets to empty).
* @param {TrigramProps} trigramProps
*/
// @ts-ignore TS1052 — the `= {}` initializer is valid JS (assigning `undefined` resets the default, asserted in tests)
set defaultCtx({ t, term, a, action, o, orient } = {}) {
this._default = normalizeClean({ t, term, a, action, o, orient });
}
/**
* Chainable form of the `defaultCtx` setter.
* @param {TrigramProps} [trigramProps]
* @returns {this}
*/
setDefaultCtx({ t, term, a, action, o, orient } = {}) {
this.defaultCtx = { t, term, a, action, o, orient };
return this;
}
/**
* Register `ComponentHandler` to render for every permutation of the
* trigram (merged over `defaultCtx`). No-op when the merged trigram is
* empty; a nullish `ComponentHandler` makes the Reactor render nothing
* for those trigrams.
* @param {TrigramProps} [trigramProps] - trigram(s) to match
* @param {import('react').ComponentType<*>} [ComponentHandler] - component
* to render on match
* @param {Object<string, *>} [props] - extra props for the rendered
* component (AppCon data overrides same-named keys)
* @returns {this}
* @throws {Error} when `ComponentHandler` is neither a React.Component
* nor a function
*/
addComponentHandler(
{ t, term, a, action, o, orient } = {},
ComponentHandler,
props,
) {
if (
ComponentHandler &&
!(
ComponentHandler instanceof React.Component ||
ComponentHandler instanceof Function
)
) {
throw new Error(
'cannot add a Component handler that is not a React.Component or Function',
);
}
const tao = normalizeClean({ t, term, a, action, o, orient });
const ctx = Object.assign(this.defaultCtx, tao);
const permutations = cartesian(ctx);
if (!permutations.length) {
return this;
}
const handler = wrappedHandler(ComponentHandler, props, this);
if (!this._components.has(ComponentHandler)) {
this._components.set(ComponentHandler, {
handlers: new Map(),
index: new Map(),
});
}
const componentHandlers = this._components.get(ComponentHandler);
permutations.forEach((tao) => {
const { term, action, orient } = tao;
const acKey = AppCtx.getKey(term, action, orient);
if (!componentHandlers.index.has(acKey)) {
componentHandlers.index.set(acKey, new AppCtx(term, action, orient));
}
const ac = componentHandlers.index.get(acKey);
if (!componentHandlers.handlers.has(ac)) {
componentHandlers.handlers.set(ac, handler);
this._tao.addInlineHandler(ac.unwrapCtx(), handler);
}
});
return this;
}
/**
* Unregister a component: with trigram parts, removes those permutations;
* with an empty trigram (and empty `defaultCtx`), removes every handler
* registered for `ComponentHandler`.
* @param {TrigramProps} [trigramProps] - trigram(s) to remove
* @param {import('react').ComponentType<*>} [ComponentHandler] - the
* registered component
* @returns {this}
*/
removeComponentHandler(
{ t, term, a, action, o, orient } = {},
ComponentHandler,
) {
if (!this._components.has(ComponentHandler)) {
return this;
}
const componentHandlers = this._components.get(ComponentHandler);
const tao = normalizeClean({ t, term, a, action, o, orient });
if (!tao.term && !tao.action && !tao.orient) {
// remove all handlers
for (let [ac, handler] of componentHandlers.handlers) {
this._tao.removeInlineHandler(ac.unwrapCtx(), handler);
}
this._components.delete(ComponentHandler);
return this;
}
const ctx = Object.assign(this.defaultCtx, tao);
const permutations = cartesian(ctx);
permutations.forEach(({ term: t, action: a, orient: o }) => {
const acKey = AppCtx.getKey(t, a, o);
const ac = componentHandlers.index.get(acKey);
if (!ac) {
return;
}
componentHandlers.index.delete(acKey);
// currently cannot hit this guard
// if (!componentHandlers.handlers.has(ac)) {
// return;
// }
const handler = componentHandlers.handlers.get(ac);
this._tao.removeInlineHandler(ac.unwrapCtx(), handler);
componentHandlers.handlers.delete(ac);
});
return this;
}
/**
* Subscribe a Reactor (or any identity) to be notified on new matches.
* @param {object} reactor - the subscriber identity
* @param {() => void} [notify] - called when a matching AppCon updates
* `current`
* @returns {void}
*/
registerReactor(reactor, notify = noop) {
this._reactors.set(reactor, notify);
}
/**
* Remove a previously registered Reactor subscription.
* @param {object} reactor - the subscriber identity
* @returns {void}
*/
unregisterReactor(reactor) {
this._reactors.delete(reactor);
}
}
export default Adapter;
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