import { useState, useEffect } from "react";
import { Person, PersonList as PersonListProto } from "../items";
import { Login } from "./Login";
import { PersonList } from "./PersonList";
import { PersonDetails } from "./PersonDetails";
import { GameList } from "./GameList";
import { GameFilter } from "./GameFilter";
import { GameDetails } from "./GameDetails";
import { ShaderBackground } from "./ShaderBackground";
import { BrowserRouter, Routes, Route, NavLink } from "react-router-dom";
import "./App.css";
import { apiFetch } from "./api";
import { Toast } from "./Toast";
import type { ToastType } from "./Toast";

interface ToastMessage {
  id: number;
  message: string;
  type: ToastType;
}

function App() {
  const [people, setPeople] = useState<Person[]>([]);
  const [token, setToken] = useState<string>(
    localStorage.getItem("token") || ""
  );
  const [theme, _setTheme] = useState<string>(
    localStorage.getItem("theme") || "default"
  );
  const setTheme = (theme: string) => {
    _setTheme(theme);
    localStorage.setItem("theme", theme);
  };
  const [toasts, setToasts] = useState<ToastMessage[]>([]);
  const [isLoading, setIsLoading] = useState(false);

  useEffect(() => {
    if (theme !== "default") {
      document.body.classList.add("shader-theme");
    } else {
      document.body.classList.remove("shader-theme");
    }
  }, [theme]);

  const addToast = (message: string, type: ToastType = "info") => {
    const id = Date.now();
    setToasts((prev) => [...prev, { id, message, type }]);
  };

  const removeToast = (id: number) => {
    setToasts((prev) => prev.filter((t) => t.id !== id));
  };

  const fetchPeople = () => {
    if (!token) return;
    setIsLoading(true);

    apiFetch("/api")
      .then((res) => res.arrayBuffer())
      .then((buffer) => {
        const list = PersonListProto.decode(new Uint8Array(buffer));
        setPeople(list.person);
      })
      .catch((err) => {
        console.error("Failed to fetch people:", err);
        addToast("Failed to fetch people list", "error");
      })
      .finally(() => setIsLoading(false));
  };

  useEffect(() => {
    fetchPeople();
    // eslint-disable-next-line react-hooks/exhaustive-deps
  }, [token]);

  const handleLogin = (newToken: string) => {
    setToken(newToken);
    localStorage.setItem("token", newToken);
    addToast("Welcome back!", "success");
  };

  const handleLogout = () => {
    setToken("");
    setPeople([]);
    localStorage.removeItem("token");
    addToast("Logged out successfully", "info");
  };

  if (!token) {
    return <Login onLogin={handleLogin} />;
  }

  const themes = [
    { id: "default", label: "Default", icon: "🏠" },
    { id: "blackhole", label: "Blackhole", icon: "🕳️" },
    { id: "star", label: "Star", icon: "⭐" },
    { id: "ball", label: "Ball", icon: "⚽" },
    { id: "reflect", label: "Reflect", icon: "🪞" },
    { id: "clouds", label: "Clouds", icon: "☁️" },
  ];

  return (
    <BrowserRouter>
      {isLoading && <div className="loading-bar" style={{ width: "50%" }} />}
      <div className="toast-container">
        {toasts.map((toast) => (
          <Toast
            key={toast.id}
            message={toast.message}
            type={toast.type}
            onClose={() => removeToast(toast.id)}
          />
        ))}
      </div>
      <div className="card">
        <div className="navbar">
          <div className="nav-links">
            <NavLink to="/" className="nav-link">
              People
            </NavLink>
            <NavLink to="/games" className="nav-link">
              Games
            </NavLink>
            <NavLink to="/filter" className="nav-link">
              Filter
            </NavLink>
          </div>

          <div style={{ display: "flex", alignItems: "center", gap: "1.5rem" }}>
            <div className="theme-switcher">
              {themes.map((t) => (
                <button
                  key={t.id}
                  className={`theme-btn theme-${t.id} ${
                    theme === t.id ? "active" : ""
                  }`}
                  onClick={() => setTheme(t.id)}
                  title={t.label}
                >
                  {t.icon}
                </button>
              ))}
            </div>
            <button onClick={handleLogout} className="btn-secondary">
              Logout
            </button>
          </div>
        </div>
        <ShaderBackground theme={theme} />
        <Routes>
          <Route path="/" element={<PersonList people={people} />} />
          <Route path="/games" element={<GameList onShowToast={addToast} />} />
          <Route path="/filter" element={<GameFilter />} />
          <Route path="/person/:name" element={<PersonDetails />} />
          <Route path="/game/:title" element={<GameDetails />} />
        </Routes>
      </div>
    </BrowserRouter>
  );
}

export default App;