import { useState } from "react";
import { Icon } from "../../icon";
import { formatRelativeTime } from "../../../utils/time";
import type { NotificationItem as NotificationItemType } from "../../../api/notifications";

export interface NotificationItemProps {
	notification: NotificationItemType;
	onMarkRead: (id: string) => void;
	onDismiss: (id: string) => void;
}

import type { IconName } from "../../../utils/icons";

const severityIconMap: Record<string, IconName> = {
	info: "info",
	warning: "warning",
	error: "error",
	success: "success",
};

function formatMetadataValue(value: unknown): string {
	if (value === null || value === undefined) return "—";
	if (typeof value === "string") return value;
	if (typeof value === "number") return String(value);
	if (typeof value === "boolean") return value ? "Yes" : "No";
	try {
		return JSON.stringify(value);
	} catch {
		return String(value);
	}
}

export function NotificationItem({
	notification,
	onMarkRead,
	onDismiss,
}: NotificationItemProps) {
	const isUnread = notification.read_at === null;
	const iconName = severityIconMap[notification.severity] ?? "info";
	const [expanded, setExpanded] = useState(false);

	const hasDetails =
		!!notification.message ||
		Object.keys(notification.metadata || {}).length > 0;

	return (
		<li
			role="listitem"
			className={`notification-item ${isUnread ? "notification-item--unread" : "notification-item--read"}`}
		>
			<div className="notification-item-icon">
				<Icon name={iconName} size="md" />
			</div>
			<div className="notification-item-content">
				<div className="notification-item-title">{notification.title}</div>
				{notification.message && (
					<div className="notification-item-message">
						{notification.message}
					</div>
				)}
				<div className="notification-item-time">
					{formatRelativeTime(notification.created_at)}
				</div>
				{expanded && notification.metadata && (
					<dl className="notification-item-metadata">
						{Object.entries(notification.metadata).map(([key, value]) => (
							<div key={key} className="notification-metadata-row">
								<dt>{key.replace(/_/g, " ")}</dt>
								<dd>{formatMetadataValue(value)}</dd>
							</div>
						))}
					</dl>
				)}
			</div>
			<div className="notification-item-actions">
				{hasDetails && (
					<button
						type="button"
						className="notification-item-action"
						onClick={() => setExpanded(!expanded)}
						aria-label={expanded ? "Hide details" : "Show details"}
					>
						{expanded ? "Less" : "Details"}
					</button>
				)}
				{isUnread && (
					<button
						type="button"
						className="notification-item-action"
						onClick={() => onMarkRead(notification.id)}
						aria-label="Mark read"
					>
						Mark read
					</button>
				)}
				<button
					type="button"
					className="notification-item-action"
					onClick={() => onDismiss(notification.id)}
					aria-label="Dismiss"
				>
					Dismiss
				</button>
			</div>
		</li>
	);
}