decky-frontend-lib/src/utils/react/react.ts

import * as React from 'react';

// this shouldn't need to be redeclared but it does for some reason

declare global {
  interface Window {
    SP_REACT: typeof React;
  }
}

/**
 * Create a Regular Expression to search for a React component that uses certain props in order.
 *
 * @export
 * @param {string[]} propList Ordererd list of properties to search for
 * @returns {RegExp} RegEx to call .test(component.toString()) on
 */
export function createPropListRegex(propList: string[], fromStart: boolean = true): RegExp {
  let regexString = fromStart ? "const\{" : "";
  propList.forEach((prop: any, propIdx) => {
    regexString += `"?${prop}"?:[a-zA-Z_$]{1,2}`;
    if (propIdx < propList.length - 1) {
      regexString += ",";
    }
  });

  // TODO provide a way to enable this
  // console.debug(`[DFL:Utils] createPropListRegex generated regex "${regexString}" for props`, propList);

  return new RegExp(regexString);
}

let oldHooks = {};

export function applyHookStubs(customHooks: any = {}): any {
  const hooks = (window.SP_REACT as any).__SECRET_INTERNALS_DO_NOT_USE_OR_YOU_WILL_BE_FIRED.ReactCurrentDispatcher
    .current;

  // TODO: add more hooks

  oldHooks = {
    useContext: hooks.useContext,
    useCallback: hooks.useCallback,
    useLayoutEffect: hooks.useLayoutEffect,
    useEffect: hooks.useEffect,
    useMemo: hooks.useMemo,
    useRef: hooks.useRef,
    useState: hooks.useState,
  };

  hooks.useCallback = (cb: Function) => cb;
  hooks.useContext = (cb: any) => cb._currentValue;
  hooks.useLayoutEffect = (_: Function) => {}; //cb();
  hooks.useMemo = (cb: Function, _: any[]) => cb;
  hooks.useEffect = (_: Function) => {}; //cb();
  hooks.useRef = (val: any) => ({ current: val || {} });
  hooks.useState = (v: any) => {
    let val = v;

    return [val, (n: any) => (val = n)];
  };

  Object.assign(hooks, customHooks);

  return hooks;
}

export function removeHookStubs() {
  const hooks = (window.SP_REACT as any).__SECRET_INTERNALS_DO_NOT_USE_OR_YOU_WILL_BE_FIRED.ReactCurrentDispatcher
    .current;
  Object.assign(hooks, oldHooks);
  oldHooks = {};
}

export function fakeRenderComponent(fun: Function, customHooks?: any): any {
  const hooks = applyHookStubs(customHooks);

  const res = fun(hooks); // TODO why'd we do this?

  removeHookStubs();

  return res;
}

export function wrapReactType(node: any, prop: any = 'type') {
  if (node[prop]?.__DECKY_WRAPPED) {
    return node[prop];
  } else {
    return (node[prop] = { ...node[prop], __DECKY_WRAPPED: true });
  }
}

export function wrapReactClass(node: any, prop: any = 'type') {
  if (node[prop]?.__DECKY_WRAPPED) {
    return node[prop];
  } else {
    const cls = node[prop];
    const wrappedCls = class extends cls {
      static __DECKY_WRAPPED = true;
    };
    return (node[prop] = wrappedCls);
  }
}

export function getReactRoot(o: HTMLElement | Element | Node) {
  return (
    (o as any)[Object.keys(o).find((k) => k.startsWith('__reactContainer$')) as string] ||
    (o as any)['_reactRootContainer']?._internalRoot?.current
  );
}

export function getReactInstance(o: HTMLElement | Element | Node) {
  return (
    (o as any)[Object.keys(o).find((k) => k.startsWith('__reactFiber')) as string] ||
    (o as any)[Object.keys(o).find((k) => k.startsWith('__reactInternalInstance')) as string]
  );
}

// Based on https://github.com/GooseMod/GooseMod/blob/9ef146515a9e59ed4e25665ed365fd72fc0dcf23/src/util/react.js#L20
export interface findInTreeOpts {
  walkable?: string[];
  ignore?: string[];
}

export declare type findInTreeFilter = (element: any) => boolean;

export const findInTree = (parent: any, filter: findInTreeFilter, opts: findInTreeOpts): any => {
  const { walkable = null, ignore = [] } = opts ?? {};

  if (!parent || typeof parent !== 'object') {
    // Parent is invalid to search through
    return null;
  }

  if (filter(parent)) return parent; // Parent matches, just return

  if (Array.isArray(parent)) {
    // Parent is an array, go through values
    return parent.map((x) => findInTree(x, filter, opts)).find((x) => x);
  }

  // Parent is an object, go through values (or option to only use certain keys)
  return (walkable || Object.keys(parent))
    .map((x) => !ignore.includes(x) && findInTree(parent[x], filter, opts))
    .find((x: any) => x);
};

export const findInReactTree = (node: any, filter: findInTreeFilter) =>
  findInTree(node, filter, {
    // Specialised findInTree for React nodes
    walkable: ['props', 'children', 'child', 'sibling'],
  });