"use client";

import { Loader2 } from "lucide-react";
import { useEffect, useState } from "react";
import type { ResolveShareResponse } from "@/domain/design";
import { readRoute, type AppRoute } from "@/application/route";
import { designGateway } from "@/infrastructure/designGateway";
import { httpStatusOf } from "@/infrastructure/userMessages";
import { BrandMark } from "@/ui/components/BrandMark";
import { BrandKitRoutePage } from "@/ui/pages/BrandKitRoutePage";
import { CanvasWorkspace } from "@/ui/pages/CanvasWorkspace";
import { HomePage } from "@/ui/pages/HomePage";
import { NotFoundPage } from "@/ui/pages/NotFoundPage";
import { ProjectsRoutePage } from "@/ui/pages/ProjectsRoutePage";
import { useAuth } from "@/ui/auth/AuthProvider";

export function App() {
  const { isAuthenticated, openLogin } = useAuth();
  const [route, setRoute] = useState<AppRoute | null>(null);

  useEffect(() => {
    setRoute(readRoute());
    const handleRoute = () => setRoute(readRoute());
    window.addEventListener("hashchange", handleRoute);
    window.addEventListener("popstate", handleRoute);
    return () => {
      window.removeEventListener("hashchange", handleRoute);
      window.removeEventListener("popstate", handleRoute);
    };
  }, []);

  useEffect(() => {
    if (route?.name === "project" && !isAuthenticated) {
      openLogin();
    }
  }, [isAuthenticated, openLogin, route]);

  if (!route) {
    return (
      <div className="workspace-loading">
        <Loader2 className="spin" size={28} />
      </div>
    );
  }

  if (route.name === "project" && !isAuthenticated) return <ProjectAuthPreview />;
  if (route.name === "project") return <CanvasWorkspace projectId={route.id} />;
  if (route.name === "share") return <SharedCanvasRoute shareId={route.id} />;
  if (route.name === "projects") return <ProjectsRoutePage />;
  if (route.name === "brandKit") return <BrandKitRoutePage />;
  if (route.name === "notFound") return <NotFoundPage />;
  return <HomePage />;
}

function SharedCanvasRoute({ shareId }: { shareId: string }) {
  const { isAuthenticated, openRequiredLogin } = useAuth();
  const [resolved, setResolved] = useState<ResolveShareResponse | null>(null);
  const [state, setState] = useState<"loading" | "not-found" | "error">("loading");

  useEffect(() => {
    let active = true;
    let releaseRequiredLogin: (() => void) | undefined;
    setResolved(null);
    setState("loading");
    designGateway
      .resolveShare(shareId)
      .then((response) => {
        if (!active) return;
        setResolved(response);
      })
      .catch((error: unknown) => {
        if (!active) return;
        const status = httpStatusOf(error);
        if (status === 401 && !isAuthenticated) {
          releaseRequiredLogin = openRequiredLogin();
          return;
        }
        setState(status === 403 || status === 404 ? "not-found" : "error");
      });
    return () => {
      active = false;
      releaseRequiredLogin?.();
    };
  }, [isAuthenticated, openRequiredLogin, shareId]);

  if (resolved) {
    return <CanvasWorkspace projectId={resolved.project.id} shareAccess={resolved.access} />;
  }
  if (state === "not-found") return <NotFoundPage />;
  if (state === "error") {
    return (
      <div className="workspace-loading">
        <span>Unable to open this shared canvas.</span>
      </div>
    );
  }
  return <ProjectAuthPreview />;
}

function ProjectAuthPreview() {
  return (
    <div className="project-auth-shell" aria-hidden="true">
      <div className="project-auth-blur">
        <header className="project-auth-topbar">
          <div className="project-auth-title">
            <BrandMark className="project-auth-mark" />
            <span />
          </div>
          <div className="project-auth-top-actions">
            <i />
            <i />
            <b />
          </div>
        </header>
        <main className="project-auth-main">
          <section className="project-auth-stage">
            <div className="project-auth-grid" />
            <div className="project-auth-frame primary" />
            <div className="project-auth-frame secondary" />
            <div className="project-auth-frame tertiary" />
            <div className="project-auth-toolbar">
              <i />
              <i />
              <i />
              <i />
            </div>
          </section>
          <aside className="project-auth-panel">
            <div className="project-auth-panel-head">
              <span />
              <i />
              <i />
            </div>
            <div className="project-auth-thread">
              <b />
              <span />
              <span />
              <span />
            </div>
            <div className="project-auth-composer">
              <span />
              <div>
                <i />
                <i />
              </div>
            </div>
          </aside>
        </main>
      </div>
    </div>
  );
}