import React, { useEffect, useRef } from 'react';
import { Link, NavLink } from 'react-router-dom';
import { useAuth } from '../context/useAuth';

import {
  Sidebar,
  SidebarContent,
  SidebarFooter,
  SidebarGroup,
  SidebarGroupContent,
  SidebarHeader,
  SidebarMenu,
  SidebarMenuButton,
  SidebarMenuItem,
  useSidebar,
} from '@/components/ui/sidebar';

import {
  User,
  Clock,
  CalendarDays,
  Users,
  LogOut,
  Wheat,
} from 'lucide-react';

const NavBar = () => {
  const { user, logout } = useAuth();
  const { isMobile, toggleSidebar, setOpen } = useSidebar();

  const closeTimeout = useRef(null);

  useEffect(() => {
    return () => {
      if (closeTimeout.current) {
        clearTimeout(closeTimeout.current);
      }
    };
  }, []);

  if (!user) {
    return null;
  }

  const handleMouseEnter = () => {
    if (isMobile) return;

    if (closeTimeout.current) {
      clearTimeout(closeTimeout.current);
      closeTimeout.current = null;
    }

    setOpen(true);
  };

  const handleMouseLeave = () => {
    if (isMobile) return;

    closeTimeout.current = setTimeout(() => {
      setOpen(false);
    }, 150);
  };

  const handleCloseMenu = () => {
    if (isMobile) {
      toggleSidebar();
    }
  };

  const navigation = [
    {
      title: 'Profil',
      href: '/profile',
      icon: User,
    },
    {
      title: 'Résumé hebdomadaire',
      href: '/weekly-summary',
      icon: Clock,
    },
    {
      title: 'Pointage',
      href: '/pointage',
      icon: CalendarDays,
    },
  ];

  /*
   * Hauteur d'une ligne de navigation.
   *
   * Le SidebarMenuButton natif fait 32px.
   * On lui donne une ligne de 48px et on le centre.
   *
   * Le header de groupe fait lui aussi 32px.
   * En mode plié, il est remplacé visuellement par
   * une séparation, mais conserve exactement ses 32px.
   */
  const menuItemClass = 'h-12 min-h-12 flex items-center';

  const buttonClass = `
    w-full
    h-8
    min-h-8
    group-data-[collapsible=icon]:size-8!
    group-data-[collapsible=icon]:p-2!
  `;

  const linkClass = `
    flex
    h-full
    w-full
    items-center
    gap-2
    text-base
  `;

  /*
   * Header de groupe :
   *
   * Déplié :
   *   [ Navigation              ] 32px
   *
   * Plié :
   *   [ ---------------------- ] 32px
   *
   * Même hauteur dans les deux cas.
   */
  const GroupHeader = ({ children }) => (
    <div
      className="
        flex
        h-8
        min-h-8
        w-full
        items-center
        px-2
      "
    >
      {/* Nom du groupe */}
      <span
        className="
          truncate
          text-lg
          font-medium
          group-data-[collapsible=icon]:hidden
        "
      >
        {children}
      </span>

      {/* Séparation en mode plié */}
      <div
        className="
          hidden
          w-full
          border-t
          border-sidebar-border
          group-data-[collapsible=icon]:block
        "
      />
    </div>
  );

  return (
    <Sidebar
      className="border-0"
      collapsible="icon"
      onMouseEnter={handleMouseEnter}
      onMouseLeave={handleMouseLeave}
    >
      {/* Logo / nom de la boulangerie */}
      <SidebarHeader className="h-16 p-2 pl-0">
        <SidebarMenu>
          <SidebarMenuItem className="h-12 flex items-center">
            <SidebarMenuButton
              size="lg"
              className="
                h-12
                w-full
                group-data-[collapsible=icon]:h-8!
                group-data-[collapsible=icon]:w-10!
                group-data-[collapsible=icon]:p-2!
              "
              render={
                <Link
                  to="/"
                  className="flex w-full items-center gap-2"
                >
                  <div className="flex aspect-square size-8 shrink-0 items-center justify-center rounded-lg bg-sidebar-primary text-sidebar-primary-foreground">
                    <Wheat className="size-4" />
                  </div>

                  <div className="grid min-w-0 flex-1 text-left text-sm leading-tight">
                    <span className="truncate font-semibold">
                      Le Fournil du Bocage
                    </span>

                    <span className="truncate text-xs">
                      Gestion
                    </span>
                  </div>
                </Link>
              }
            />
          </SidebarMenuItem>
        </SidebarMenu>
      </SidebarHeader>

      <SidebarContent>
        {/* Navigation */}
        <SidebarGroup className="p-2">
          <GroupHeader>
            Navigation
          </GroupHeader>

          <SidebarGroupContent>
            <SidebarMenu>
              {navigation.map((item) => {
                const Icon = item.icon;

                return (
                  <SidebarMenuItem
                    key={item.href}
                    className={menuItemClass}
                  >
                    <SidebarMenuButton
                      tooltip={item.title}
                      onClick={handleCloseMenu}
                      className={buttonClass}
                      render={
                        <NavLink
                          to={item.href}
                          className={linkClass}
                        >
                          <Icon className="size-6 shrink-0" />

                          <span className="truncate text-base">
                            {item.title}
                          </span>
                        </NavLink>
                      }
                    />
                  </SidebarMenuItem>
                );
              })}
            </SidebarMenu>
          </SidebarGroupContent>
        </SidebarGroup>

        {/* Administration */}
        {user.is_admin && (
          <SidebarGroup className="p-2">
            <GroupHeader>
              Administration
            </GroupHeader>

            <SidebarGroupContent>
              <SidebarMenu>
                <SidebarMenuItem className={menuItemClass}>
                  <SidebarMenuButton
                    tooltip="Comptes existants"
                    onClick={handleCloseMenu}
                    className={buttonClass}
                    render={
                      <NavLink
                        to="/users"
                        className={linkClass}
                      >
                        <Users className="size-6 shrink-0" />

                        <span className="truncate text-base">
                          Comptes existants
                        </span>
                      </NavLink>
                    }
                  />
                </SidebarMenuItem>
              </SidebarMenu>
            </SidebarGroupContent>
          </SidebarGroup>
        )}
      </SidebarContent>

      {/* Déconnexion */}
      <SidebarFooter>
        <SidebarMenu>
          <SidebarMenuItem className={menuItemClass}>
            <SidebarMenuButton
              tooltip="Déconnexion"
              onClick={handleCloseMenu}
              className={buttonClass}
              render={
                <button
                  type="button"
                  onClick={logout}
                  className={linkClass}
                >
                  <LogOut className="size-6 shrink-0" />

                  <span className="truncate text-base">
                    Déconnexion
                  </span>
                </button>
              }
            />
          </SidebarMenuItem>
        </SidebarMenu>
      </SidebarFooter>
    </Sidebar>
  );
};

export default NavBar;