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import "@fontsource/inter-tight/600.css";
import "@fontsource/jetbrains-mono/400.css";
import "@wooorm/starry-night/style/both";

import {
  derived,
  effect,
  el,
  fragment,
  signal,
  PromiseSnapshot,
} from "./ef.js";

import { app, route, title } from "./app.js";
import { type LibBundleEntry, type Route } from "./route.js";

declare global {
  const __VERSION__: string;
  const __BUNDLE_INFO__: readonly LibBundleEntry[];
}

function rafp(): Promise<void> {
  return new Promise((resolve) => {
    requestAnimationFrame(() => {
      resolve();
    });
  });
}

const $route = signal<PromiseSnapshot<Route, unknown>>({
  isSettled: false,
  isRejected: false,
  isResolved: false,
});

route(location.pathname)
  .then(async (r) => {
    $route.set({
      isSettled: true,
      isRejected: false,
      isResolved: true,
      data: r,
    });

    const url = new URL(location.href);
    if (!url.hash) {
      return;
    }

    // Wait for the new element to be attached to document tree
    await rafp();

    const match = document.querySelector(url.hash);
    if (match) {
      match.scrollIntoView();
    }
  })
  .catch((error) => {
    $route.set({
      isSettled: true,
      isRejected: true,
      isResolved: false,
      error,
    });
  });

if (window.navigation) {
  window.navigation.addEventListener("navigate", (ev) => {
    if (
      !ev.canIntercept ||
      ev.downloadRequest ||
      ev.hashChange ||
      ev.navigationType === "reload" ||
      !ev.userInitiated
    ) {
      return;
    }

    ev.intercept({
      async handler() {
        const r = await route(new URL(ev.destination.url).pathname);

        // NOTE: Chrome seems to have a bug that it can't scroll at all on Navigation API.
        //       I don't know what causes this.
        if (ev.navigationType === "push") {
          document.body.scroll({
            top: 0,
            behavior: "instant",
          });
        }

        $route.set({
          isSettled: true,
          isRejected: false,
          isResolved: true,
          data: r,
        });

        // Wait for the new element to be attached to document tree
        await rafp();
      },
    });
  });
}

const $title = derived(() => {
  const route = $route.get();
  if (!route.isResolved) {
    return null;
  }

  return route.data.title;
});

effect(() => {
  if ($title.value) {
    document.title = title($title.value);
  }
});

const $head = derived(() => {
  if (!$route.value.isResolved) {
    return null;
  }

  return fragment($route.value.data.head || []);
});

const headMarker = document.head.querySelector(
  `script[type="application/json"][data-ef-head-mk]`,
);
while (headMarker && headMarker.nextSibling) {
  document.head.removeChild(headMarker.nextSibling);
}

document.head.appendChild(fragment([$head]));

const ctx = {
  version: __VERSION__,
  bundle: __BUNDLE_INFO__,
};

const $main = derived(() => {
  if (!$route.value.isSettled) {
    return el("p", [], ["Loading"]);
  }

  if ($route.value.isRejected) {
    return el(
      "p",
      [],
      ["Failed to render the route: ", String($route.value.error)],
    );
  }

  return $route.value.data.content(ctx);
});

const $outline = derived(() => {
  if (!$route.value.isResolved) {
    return null;
  }

  return $route.value.data.outline?.(ctx);
});

document.body.replaceChildren(app($main, $outline));