"use client";

import Router from "@/components/Router";
import AppSidebar, { SidebarTrigger } from "@/components/sidebar/AppSidebar";
import { useWorkspace } from "@/hooks/workspace";
import { ChevronRight } from "lucide-react";
import Cookies from "js-cookie";
import { useEffect, useState } from "react";
import { Route } from "@/lib/types";
import { Button } from "@/components/ui/button";
import {
  createDefaultWorkspace,
  saveWorkspaceToLocalStorage,
} from "@/lib/workspace";

export default function Workspace() {
  const {
    workspace,
    loadWorkspace,
    updateEntity,
    setWorkspace,
    addEntity,
    addGroup,
    renameEntity,
    deleteEntity,
    removeNode,
    renameGroup,
  } = useWorkspace();

  const [route, setRoute] = useState<Route>({});

  /**
   * Initialize workspace from cookie on mount
   */
  useEffect(() => {
    const routeString = Cookies.get("route");
    if (!routeString) return;
    const route = JSON.parse(routeString) as Route;
    setRoute(route);
  }, []);

  /**
   * Load workspace when currentWorkspace changes.
   *
   * `loadWorkspace` is intentionally omitted from the dependency array
   * because it is recreated on every render by the `useWorkspace` hook.
   * Including it would cause this effect to run repeatedly and trigger
   * the "maximum update depth exceeded" error. ESLint warning is disabled
   * for this case.
   */
  useEffect(() => {
    loadWorkspace(route.workspace);
    if (route.workspace) {
      Cookies.set("route", JSON.stringify(route));
    } else {
      Cookies.remove("route");
    }
    // eslint-disable-next-line react-hooks/exhaustive-deps
  }, [route]);

  /**
   * Load route (entity) from localStorage when workspace loads
   */
  useEffect(() => {
    if (!workspace) return;

    try {
      const savedRoute = localStorage.getItem(`route_${workspace.id}`);

      if (savedRoute) {
        const parsedRoute: Route = JSON.parse(savedRoute);
        setRoute(parsedRoute);
      } else {
        // Default to first entity if no route saved
        const firstEntityId = Object.keys(workspace.entities)[0];
        if (firstEntityId) {
          setRoute({ workspace: workspace.id, entity: firstEntityId });
        }
      }
    } catch (err) {
      console.error("Failed to load route:", err);
      const firstEntityId = Object.keys(workspace.entities)[0];
      if (firstEntityId) {
        setRoute({ workspace: workspace.id, entity: firstEntityId });
      }
    }
  }, [workspace?.id]);

  /**
   * Save route whenever it changes
   */
  useEffect(() => {
    if (!workspace || !route.entity) return;

    try {
      localStorage.setItem(
        `route_${workspace.id}`,
        JSON.stringify({ workspace: workspace.id, entity: route.entity }),
      );
    } catch (err) {
      console.error("Failed to save route:", err);
    }
  }, [route, workspace?.id]);

  if (!workspace) {
    return (
      <main
        className="flex h-svh items-center justify-center bg-linear-to-br from-blue-50 to-indigo-100 dark:from-slate-900 dark:to-slate-800"
        onClick={() => {
          const w = createDefaultWorkspace();
          saveWorkspaceToLocalStorage(w);
          setRoute({ workspace: w.id });
        }}
      >
        <div className="text-center space-y-6">
          <h1 className="text-4xl font-bold">Welcome to Drift</h1>
          <p className="text-lg text-muted-foreground">
            Your personal productivity workspace
          </p>
          <Button size="lg" className="text-base">
            Create a new workspace
          </Button>
        </div>
      </main>
    );
  }

  return (
    <AppSidebar
      workspace={workspace}
      setRoute={setRoute}
      setWorkspace={setWorkspace}
      addEntity={addEntity}
      addGroup={addGroup}
      renameEntity={renameEntity}
      deleteEntity={deleteEntity}
      removeNode={removeNode}
      renameGroup={renameGroup}
    >
      <SidebarTrigger className="w-full px-4">
        <div className="px-4">
          <header className="w-full border-b pb-3 pt-2 hover:bg-accent/20 flex items-center text-foreground/90 gap-2">
            <span className="font-semibold">{workspace.name}</span>
            <ChevronRight className="h-5 text-muted-foreground" />
            <span className="text-muted-foreground">
              {workspace.entities[route.entity || ""]?.name || "Select an item"}
            </span>
          </header>
        </div>
      </SidebarTrigger>

      <Router workspace={workspace} route={route} updateEntity={updateEntity} />
    </AppSidebar>
  );
}