import { useEffect, useState } from "react";
import Sidebar from "./components/layout/Sidebar";
import TopMenu from "./components/layout/TopMenu";

import Home from "./pages/Home";
import MetersPage from "./pages/meters/MeterPage";
import ConcentratorsPage from "./pages/concentrators/ConcentratorsPage";
import ProjectsPage from "./pages/projects/ProjectsPage";
import UsersPage from "./pages/UsersPage";
import RolesPage from "./pages/RolesPage";
import ConsumptionPage from "./pages/consumption/ConsumptionPage";
import ProfileModal from "./components/layout/common/ProfileModal";
import { updateMyProfile } from "./api/me";

import SettingsModal, {
  type AppSettings,
  loadSettings,
} from "./components/SettingsModals";

import LoginPage from "./pages/LoginPage";

// Auth imports
import {
  isAuthenticated,
  getMe,
  logout as authLogout,
  clearAuth,
  type AuthUser,
} from "./api/auth";

import ConfirmModal from "./components/layout/common/ConfirmModal";
import Watermark from "./components/layout/common/Watermark";

export type Page =
  | "home"
  | "projects"
  | "meters"
  | "concentrators"
  | "consumption"
  | "users"
  | "roles";

export default function App() {
  const [isAuth, setIsAuth] = useState<boolean>(false);
  const [user, setUser] = useState<AuthUser | null>(null);
  const [authLoading, setAuthLoading] = useState(true);

  // Check authentication on mount
  useEffect(() => {
    const checkAuth = async () => {
      if (isAuthenticated()) {
        try {
          const userData = await getMe();
          setUser(userData);
          setIsAuth(true);
        } catch {
          clearAuth();
          setIsAuth(false);
          setUser(null);
        }
      }
      setAuthLoading(false);
    };
    checkAuth();
  }, []);

  const handleLogin = () => {
    // After successful login, fetch user data
    const fetchUser = async () => {
      try {
        const userData = await getMe();
        setUser(userData);
        setIsAuth(true);
      } catch {
        clearAuth();
        setIsAuth(false);
      }
    };
    fetchUser();
  };

  const handleLogout = async () => {
    try {
      await authLogout();
    } catch {
      // Ignore logout errors
    }
    clearAuth();
    setUser(null);
    setIsAuth(false);
    // Reset navigation
    setPage("home");
    setSubPage("default");
    setSelectedProject("");
  };

  // ✅ confirm logout modal state
  const [logoutOpen, setLogoutOpen] = useState(false);
  const [loggingOut, setLoggingOut] = useState(false);

  const [page, setPage] = useState<Page>("home");
  const [subPage, setSubPage] = useState<string>("default");
  const [selectedProject, setSelectedProject] = useState<string>("");

  const [profileOpen, setProfileOpen] = useState(false);
  const [savingProfile, setSavingProfile] = useState(false);

  const [settingsOpen, setSettingsOpen] = useState(false);
  const [settings, setSettings] = useState<AppSettings>(() => loadSettings());

  const navigateToMetersWithProject = (projectName: string) => {
    setSelectedProject(projectName);
    setSubPage(projectName);
    setPage("meters");
  };

  const handleUploadAvatar = async (file: File) => {
    const base64 = await fileToBase64(file);
    localStorage.setItem("mock_avatar", base64);
    setUser((prev) => prev ? { ...prev, avatar_url: base64 } : null);
  };

  function fileToBase64(file: File) {
    return new Promise<string>((resolve, reject) => {
      const reader = new FileReader();
      reader.onload = () => resolve(String(reader.result));
      reader.onerror = reject;
      reader.readAsDataURL(file);
    });
  }

  const handleSaveProfile = async (next: {
    name: string;
    email: string;
    organismName?: string;
  }) => {
    if (!user) return;
    setSavingProfile(true);
    try {
      const updated = await updateMyProfile(next);

      setUser((prev) => prev ? ({
        ...prev,
        name: updated.name ?? next.name ?? prev.name,
        email: updated.email ?? next.email ?? prev.email,
        avatar_url: updated.avatarUrl ?? prev.avatar_url,
      }) : null);

      setProfileOpen(false);
    } finally {
      setSavingProfile(false);
    }
  };

  useEffect(() => {
    const root = document.documentElement;
    root.classList.remove("dark");

    if (settings.theme === "dark") root.classList.add("dark");
    if (settings.theme === "system") {
      const prefersDark = window.matchMedia?.(
        "(prefers-color-scheme: dark)"
      )?.matches;
      if (prefersDark) root.classList.add("dark");
    }
  }, [settings.theme]);

  const renderPage = () => {
    switch (page) {
      case "projects":
        return <ProjectsPage />;
      case "meters":
        return <MetersPage selectedProject={selectedProject} />;
      case "concentrators":
        return <ConcentratorsPage />;
      case "consumption":
        return <ConsumptionPage />;
      case "users":
        return <UsersPage />;
      case "roles":
        return <RolesPage />;
      case "home":
      default:
        return (
          <Home
            setPage={(p) => {
              setPage(p);
              setSubPage("default");
            }}
            navigateToMetersWithProject={navigateToMetersWithProject}
          />
        );
    }
  };

  // Show loading while checking authentication
  if (authLoading) {
    return (
      <div className="flex h-screen w-full items-center justify-center bg-slate-50">
        <div className="text-slate-500">Cargando...</div>
      </div>
    );
  }

  if (!isAuth) {
    return <LoginPage onSuccess={handleLogin} />;
  }

  return (
    <div
      className={[
        "flex h-screen w-full overflow-hidden",
        settings.compactMode ? "text-sm" : "",
      ].join(" ")}
    >
      <div className="shrink-0">
        <Sidebar
          setPage={(p) => {
            setPage(p);
            setSubPage("default");
            if (p !== "meters") setSelectedProject("");
          }}
        />
      </div>

      <div className="flex min-w-0 flex-1 flex-col">
        <div className="shrink-0">
          <TopMenu
            page={page}
            subPage={subPage}
            setSubPage={setSubPage}
            userName={user?.name ?? "Usuario"}
            userEmail={user?.email ?? ""}
            avatarUrl={user?.avatar_url ?? null}
            onOpenProfile={() => setProfileOpen(true)}
            onRequestLogout={() => setLogoutOpen(true)}
          />
        </div>

        {/* ✅ AQUÍ VA LA MARCA DE AGUA */}
        <main className="relative min-w-0 flex-1 overflow-auto">
          <Watermark />
          <div className="relative z-10">{renderPage()}</div>
        </main>
      </div>

      <SettingsModal
        open={settingsOpen}
        onClose={() => setSettingsOpen(false)}
        settings={settings}
        setSettings={setSettings}
      />

      <ProfileModal
        open={profileOpen}
        loading={savingProfile}
        avatarUrl={user?.avatar_url ?? null}
        initial={{
          name: user?.name ?? "",
          email: user?.email ?? "",
          organismName: "",
        }}
        onClose={() => setProfileOpen(false)}
        onSave={handleSaveProfile}
        onUploadAvatar={handleUploadAvatar}
      />

      {/* ✅ ConfirmModal: Cerrar sesión */}
      <ConfirmModal
        open={logoutOpen}
        title="Cerrar sesión"
        message="¿Estás seguro que deseas cerrar sesión?"
        confirmText="Cerrar sesión"
        cancelText="Cancelar"
        danger
        loading={loggingOut}
        onClose={() => setLogoutOpen(false)}
        onConfirm={async () => {
          setLoggingOut(true);
          try {
            await handleLogout();
            setLogoutOpen(false);
          } finally {
            setLoggingOut(false);
          }
        }}
      />
    </div>
  );
}