import { type ReactNode, useEffect, useRef, useState } from "react";
import {
  Bell,
  ChevronDown,
  Languages,
  LogOut,
  MessageSquare,
  Moon,
  Sun,
  User,
} from "lucide-react";
import { Group, Stack, Text, Menu, Tooltip, Box } from "@mantine/core";

import type { PageMeta } from "./types";
import "./FreightDashboardHeader.css";

export interface FreightDashboardHeaderProps {
  pageMeta: PageMeta;
  headerRight?: ReactNode;
  enableThemeToggle?: boolean;
  userName?: string;
  userEmail?: string;
  userInitials?: string;
  onLogout?: () => void;
  theme: "light" | "dark";
  onToggleTheme: () => void;
}

const FreightDashboardHeader = ({
  pageMeta,
  headerRight,
  enableThemeToggle = false,
  userName = "User",
  userEmail,
  userInitials,
  onLogout,
  theme,
  onToggleTheme,
}: FreightDashboardHeaderProps) => {
  const initials =
    userInitials ??
    (userName
      .split(" ")
      .filter(Boolean)
      .slice(0, 2)
      .map((n) => n[0].toUpperCase())
      .join("") ||
      "U");

  const [isUserMenuOpen, setIsUserMenuOpen] = useState(false);
  const userMenuRef = useRef<HTMLDivElement | null>(null);

  useEffect(() => {
    if (!isUserMenuOpen) return;

    const handlePointerDown = (event: MouseEvent) => {
      if (
        userMenuRef.current &&
        !userMenuRef.current.contains(event.target as Node)
      ) {
        setIsUserMenuOpen(false);
      }
    };

    const handleKeyDown = (event: KeyboardEvent) => {
      if (event.key === "Escape") setIsUserMenuOpen(false);
    };

    document.addEventListener("mousedown", handlePointerDown);
    document.addEventListener("keydown", handleKeyDown);
    return () => {
      document.removeEventListener("mousedown", handlePointerDown);
      document.removeEventListener("keydown", handleKeyDown);
    };
  }, [isUserMenuOpen]);

  return (
    <header className="fdh-root">
      <Stack gap={0} style={{ flex: 1, minWidth: 0 }}>
        <span className="fdh-eyebrow">
          {/* <span className="fdh-eyebrow-dot" />
          Freight Backoffice */}
        </span>
        <Text
          fw={700}
          truncate
          style={{ fontSize: "20px", lineHeight: 1.2, color: "#0f172a", letterSpacing: "-0.4px" }}
        >
          {pageMeta.title}
        </Text>
        {/* <Text size="sm" truncate style={{ color: "#94a3b8", lineHeight: 1.35 }}>
          {pageMeta.subtitle}
        </Text> */}
      </Stack>

      <Group gap={10} wrap="nowrap">
        {enableThemeToggle && (
          <Tooltip
            label={theme === "dark" ? "Light mode" : "Dark mode"}
            withArrow
            openDelay={300}
          >
            <button
              type="button"
              className="fdh-icon-btn"
              onClick={onToggleTheme}
              aria-label="Toggle theme"
            >
              {theme === "dark" ? <Sun size={18} /> : <Moon size={18} />}
            </button>
          </Tooltip>
        )}

        <Tooltip label="Language" withArrow openDelay={300}>
          <button type="button" className="fdh-icon-btn" aria-label="Language">
            <Languages size={18} />
          </button>
        </Tooltip>

        <Tooltip label="Messages" withArrow openDelay={300}>
          <button type="button" className="fdh-icon-btn" aria-label="Messages">
            <MessageSquare size={18} />
            <span className="fdh-badge">3</span>
          </button>
        </Tooltip>

        <Tooltip label="Notifications" withArrow openDelay={300}>
          <button
            type="button"
            className="fdh-icon-btn"
            aria-label="Notifications"
          >
            <Bell size={18} />
            <span className="fdh-badge">5</span>
          </button>
        </Tooltip>

        <div className="fdh-divider" />

        <Menu
          position="bottom-end"
          shadow="lg"
          radius="md"
          width={240}
          opened={isUserMenuOpen}
          onOpen={() => setIsUserMenuOpen(true)}
          onClose={() => setIsUserMenuOpen(false)}
        >
          <Menu.Target>
            <div className="fdh-user">
              <div className="fdh-avatar-ring">
                <div className="fdh-avatar">{initials}</div>
              </div>
              <Stack gap={0} style={{ minWidth: 0 }} visibleFrom="sm">
                <Text
                  size="sm"
                  fw={600}
                  truncate
                  style={{ color: "#0f172a", lineHeight: 1.25, maxWidth: 140 }}
                >
                  {userName}
                </Text>
                <Text
                  size="xs"
                  truncate
                  style={{ color: "#94a3b8", lineHeight: 1.25, maxWidth: 140 }}
                >
                  {userEmail ?? "Administrator"}
                </Text>
              </Stack>
              <ChevronDown
                size={16}
                style={{
                  color: "#94a3b8",
                  flexShrink: 0,
                  transition: "transform 0.2s",
                  transform: isUserMenuOpen ? "rotate(180deg)" : "rotate(0deg)",
                }}
              />
            </div>
          </Menu.Target>
          <Menu.Dropdown>
            <Box px="sm" py="xs">
              <Group gap={10} wrap="nowrap">
                <div className="fdh-avatar-ring">
                  <div className="fdh-avatar">{initials}</div>
                </div>
                <Stack gap={0} style={{ minWidth: 0 }}>
                  <Text size="sm" fw={600} truncate style={{ color: "#0f172a" }}>
                    {userName}
                  </Text>
                  {userEmail && (
                    <Text size="xs" truncate style={{ color: "#94a3b8" }}>
                      {userEmail}
                    </Text>
                  )}
                </Stack>
              </Group>
            </Box>
            <Menu.Divider />
            <Menu.Item
              leftSection={<User size={15} />}
              onClick={() => setIsUserMenuOpen(false)}
            >
              Profile
            </Menu.Item>
            <Menu.Item
              leftSection={<LogOut size={15} />}
              color="red"
              onClick={() => {
                setIsUserMenuOpen(false);
                onLogout?.();
              }}
            >
              Logout
            </Menu.Item>
          </Menu.Dropdown>
        </Menu>

        {headerRight}
      </Group>
    </header>
  );
};

export default FreightDashboardHeader;