import * as stylex from "@stylexjs/stylex";
import { colors, metrics } from "@/ui/tokens.stylex";
import { useAuthority, type Authority } from "./authority";

const styles = stylex.create({
	row: {
		display: "inline-flex",
		alignItems: "baseline",
		flexWrap: "wrap",
		gap: "0.375rem",
	},
	/** The sentence is secondary to the word, and wraps rather than stretching a row. */
	reason: {
		fontSize: "0.75rem",
		lineHeight: "1rem",
		color: colors.textMuted,
	},
	tag: {
		marginLeft: "0.5rem",
		borderWidth: 1,
		borderStyle: "solid",
		borderColor: colors.border,
		borderRadius: metrics.radius,
		paddingInline: "0.375rem",
		paddingBlock: "0.125rem",
		fontSize: "0.75rem",
		lineHeight: "1rem",
		color: colors.textMuted,
	},
});

/**
 * The compact lock, for a configuration control that survives outside a
 * configuration page — the Clients page edits a group assignment the file may
 * own. The configuration pages themselves do not use it: they change rendering
 * rather than annotate a control they left up.
 *
 * The word is real text, not colour or an icon, so a screen reader announces
 * the reason the control will not answer.
 */
/**
 * Why a configuration control will not answer. Exported because a page that
 * shows the compact tag has to print this sentence itself, once, somewhere the
 * tag can point at.
 */
export function lockReason(authority: Authority): string {
	if (authority.state === "pending") return "Checking which configuration source this server obeys";
	if (authority.state === "failed") return "Configuration status unavailable, so edits are held back";
	return `Managed by ${authority.status.path ?? "the configuration file"}; edit the file and restart nxdns`;
}

export default function ConfigLockIndicator({ compact = false }: { compact?: boolean }) {
	const authority = useAuthority();
	if (authority.state === "resolved" && authority.status.authority === "database") return null;

	const reason = lockReason(authority);

	// A compact caller has no room for the sentence and must print it once
	// nearby instead: the Clients table would otherwise repeat it down every row.
	if (compact) return <span {...stylex.props(styles.tag)}>Locked</span>;

	// Everywhere else the reason is visible text rather than a `title` or an
	// `aria-label`. A tooltip reaches neither a keyboard nor a touch screen, and
	// screen-reader-only text is the same failure pointed the other way.
	return (
		<span {...stylex.props(styles.row)}>
			<span {...stylex.props(styles.tag)}>Locked</span>
			<span {...stylex.props(styles.reason)}>{reason}</span>
		</span>
	);
}