"use client";

import React, { useEffect, useRef } from "react";
import { createRoot } from "react-dom/client";

const DEFAULT_REMOTE_URL = "https://uikit.d.aiengines.ir/AppSidebar.js";
const REACT_REMOTE_DEPS_KEY = "__UIKIT_REACT_REMOTE_DEPS__";
const APP_SIDEBAR_SLOT = Symbol.for("uikit.remote.app-sidebar.slot");
const remotePromises = new Map();

function ensureReactRemoteDeps() {
  if (typeof window === "undefined") return;
  const previous = window[REACT_REMOTE_DEPS_KEY] || {};
  window[REACT_REMOTE_DEPS_KEY] = {
    ...previous,
    React: previous.React || React,
    createRoot: previous.createRoot || createRoot,
  };
}

function loadRemote(componentName, remoteFileUrl) {
  const cacheKey = `${componentName}:${remoteFileUrl}`;
  if (!remotePromises.has(cacheKey)) {
    remotePromises.set(
      cacheKey,
      import(
        /* webpackIgnore: true */
        /* @vite-ignore */
        remoteFileUrl
      ).catch((error) => {
        remotePromises.delete(cacheKey);
        throw error;
      }),
    );
  }
  return remotePromises.get(cacheKey);
}

function createReactRemoteElementComponent({
  componentName,
  tagName,
  defaultRemoteUrl,
  normalizeProps,
}) {
  return function ReactRemoteElementComponent(props) {
    const containerRef = useRef(null);
    const elementRef = useRef(null);
    const latestPropsRef = useRef(null);
    latestPropsRef.current = normalizeProps ? normalizeProps(props) : props;

    useEffect(() => {
      let active = true;
      ensureReactRemoteDeps();

      loadRemote(componentName, defaultRemoteUrl)
        .then(() => {
          if (!active || !containerRef.current) return;
          const element = document.createElement(tagName);
          element.componentProps = latestPropsRef.current;
          containerRef.current.appendChild(element);
          elementRef.current = element;
        })
        .catch((error) => {
          console.error(`[uikit/remote/ui] Failed to load ${componentName}:`, error);
        });

      return () => {
        active = false;
        if (elementRef.current) {
          elementRef.current.remove();
          elementRef.current = null;
        }
      };
    }, [componentName, defaultRemoteUrl, tagName]);

    useEffect(() => {
      if (elementRef.current) {
        elementRef.current.componentProps = latestPropsRef.current;
      }
    });

    return React.createElement("span", {
      ref: containerRef,
      style: { display: "contents" },
    });
  };
}

function createAppSidebarSlot(name) {
  function AppSidebarSlot() {
    return null;
  }
  AppSidebarSlot[APP_SIDEBAR_SLOT] = name;
  return AppSidebarSlot;
}

const Exit = createAppSidebarSlot("exit");

function toPlainText(value) {
  if (value === null || value === undefined || typeof value === "boolean") return undefined;
  if (typeof value === "string" || typeof value === "number") return String(value);
  if (Array.isArray(value)) return value.map(toPlainText).filter(Boolean).join("");
  if (React.isValidElement(value)) return toPlainText(value.props?.children);
  return undefined;
}

function extractExit(children) {
  const result = { showExit: false };
  React.Children.forEach(children, (child) => {
    if (!React.isValidElement(child)) return;
    if (child.type?.[APP_SIDEBAR_SLOT] !== "exit") return;

    result.showExit = true;
    result.exitLabel = child.props.label || toPlainText(child.props.children) || "خروج";
    result.onExit = child.props.onClick;
    result.exitDisabled = Boolean(child.props.disabled);
  });
  return result;
}


function normalizeIcon(icon) {
  if (!icon || React.isValidElement(icon)) return icon;
  if (typeof icon === "function") return React.createElement(icon);
  if (typeof icon === "object" && icon?.$$typeof) {
    try { return React.createElement(icon); } catch (_) { return icon; }
  }
  return icon;
}

function normalizeItems(items) {
  if (!Array.isArray(items)) return [];
  return items.map((item) => ({ ...item, icon: normalizeIcon(item?.icon) }));
}

const RemoteAppSidebarElement = createReactRemoteElementComponent({
  componentName: "AppSidebar",
  tagName: "uikit-app-sidebar",
  defaultRemoteUrl: DEFAULT_REMOTE_URL,
  normalizeProps: ({ children, items, ...props }) => ({
    ...props,
    items: normalizeItems(items),
    ...(children !== undefined && children !== null ? extractExit(children) : {}),
  }),
});

function AppSidebarRoot(props) {
  return React.createElement(RemoteAppSidebarElement, props);
}

export const AppSidebar = Object.assign(AppSidebarRoot, { Exit });