import { useEffect, useRef, useState, useCallback } from "react";
import { createPortal } from "react-dom";
import { useNotifications } from "../../../hooks/use-notifications";
import { useMobileViewport } from "../../../hooks/use-mobile-viewport";
import { NotificationItem } from "./notification-item";
import { Icon } from "../../icon";

interface NotificationCenterProps {
	isMobileTerminal?: boolean;
}

export function NotificationCenter({
	isMobileTerminal = false,
}: NotificationCenterProps) {
	const {
		notifications,
		unreadCount,
		markRead,
		markAllRead,
		clearAll,
		dismiss,
		refreshList,
		isDropdownOpen,
		setIsDropdownOpen,
	} = useNotifications();

	const isMobile = useMobileViewport();
	const bellRef = useRef<HTMLButtonElement>(null);
	const dropdownRef = useRef<HTMLDivElement>(null);
	const [dropdownStyle, setDropdownStyle] = useState<React.CSSProperties>({});

	const updatePosition = useCallback(() => {
		if (!bellRef.current) return;
		const rect = bellRef.current.getBoundingClientRect();
		if (isMobile) {
			setDropdownStyle({
				top: rect.bottom + 6,
				left: "1rem",
				right: "1rem",
			});
		} else {
			setDropdownStyle({
				top: rect.bottom + 6,
				right: window.innerWidth - rect.right,
			});
		}
	}, [isMobile]);

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

		updatePosition();

		const handleMouseDown = (e: MouseEvent) => {
			const target = e.target as Node;
			if (
				dropdownRef.current &&
				!dropdownRef.current.contains(target) &&
				!bellRef.current?.contains(target)
			) {
				setIsDropdownOpen(false);
			}
		};

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

		const handleResize = () => {
			updatePosition();
		};

		document.addEventListener("mousedown", handleMouseDown);
		document.addEventListener("keydown", handleKeyDown);
		window.addEventListener("resize", handleResize);

		return () => {
			document.removeEventListener("mousedown", handleMouseDown);
			document.removeEventListener("keydown", handleKeyDown);
			window.removeEventListener("resize", handleResize);
		};
	}, [isDropdownOpen, setIsDropdownOpen, updatePosition]);

	useEffect(() => {
		if (isDropdownOpen) {
			void refreshList();
		}
	}, [isDropdownOpen, refreshList]);

	if (isMobileTerminal) {
		return null;
	}

	const badgeText = unreadCount > 99 ? "99+" : String(unreadCount);

	return (
		<div className="notification-center">
			<button
				ref={bellRef}
				type="button"
				className="notification-bell"
				onClick={() => setIsDropdownOpen(!isDropdownOpen)}
				aria-label="Notifications"
				aria-haspopup="dialog"
				aria-expanded={isDropdownOpen}
			>
				<Icon name="bell" size="md" />
				{unreadCount > 0 && (
					<span className="nav-badge notification-badge">{badgeText}</span>
				)}
			</button>

			{isDropdownOpen &&
				createPortal(
					<>
						{isMobile && (
							<div
								className="notification-dropdown-backdrop"
								onClick={() => setIsDropdownOpen(false)}
								aria-hidden="true"
							/>
						)}
						<div
							ref={dropdownRef}
							role="dialog"
							aria-label="Notifications"
							className="notification-dropdown"
							style={dropdownStyle}
						>
							<div className="notification-dropdown-header">
								<span>Notifications</span>
							</div>

							<ul className="notification-list">
								{notifications.length === 0 ? (
									<li className="notification-empty">No notifications</li>
								) : (
									notifications.map((n) => (
										<NotificationItem
											key={n.id}
											notification={n}
											onMarkRead={markRead}
											onDismiss={dismiss}
										/>
									))
								)}
							</ul>

							{notifications.length > 0 && (
								<div className="notification-dropdown-footer">
									<button
										type="button"
										className="notification-mark-all"
										onClick={() => {
											void markAllRead();
										}}
									>
										Mark all as read
									</button>
									<button
										type="button"
										className="notification-clear-all"
										onClick={() => {
											void clearAll();
										}}
									>
										Clear all
									</button>
								</div>
							)}
						</div>
					</>,
					document.body,
				)}
		</div>
	);
}