utils.ts

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`b4e7f682` 2026-03-16 Pavel Safronov	1	type FriendLike = {
	2	timestamp?: number;
	3	lastSeen?: number;
	4	};
	5
	6	type UserAgentDataWithModel = Navigator['userAgentData'] & {
	7	getHighEntropyValues: (hints: string[]) => Promise<{ model?: string }>;
	8	};
	9
	10	export const getShortestDelta = (fromAngle: number, toAngle: number) => ((toAngle - fromAngle + 540) % 360) - 180;
`36d64b37` 2026-03-15 Pavel Safronov	11
`b4e7f682` 2026-03-16 Pavel Safronov	12	export const normalizeAngle = (angle: number) => ((angle % 360) + 360) % 360;
`36d64b37` 2026-03-15 Pavel Safronov	13
`b4e7f682` 2026-03-16 Pavel Safronov	14	export const normalizeSignedAngle = (angle: number) => {
`36d64b37` 2026-03-15 Pavel Safronov	15	const normalized = normalizeAngle(angle);
	16	return normalized > 180 ? normalized - 360 : normalized;
	17	};
	18
`b4e7f682` 2026-03-16 Pavel Safronov	19	export const normalizeName = (value: string \| null \| undefined) => (value \|\| '').trim().slice(0, 32);
`36d64b37` 2026-03-15 Pavel Safronov	20
`b4e7f682` 2026-03-16 Pavel Safronov	21	export const normalizeColor = (value: string \| null \| undefined) => {
`36d64b37` 2026-03-15 Pavel Safronov	22	const candidate = (value \|\| '').trim().toLowerCase();
	23	return /^#[0-9a-f]{6}$/.test(candidate) ? candidate : '';
	24	};
	25
`b4e7f682` 2026-03-16 Pavel Safronov	26	export const getReadableTextColor = (hexColor: string) => {
`36d64b37` 2026-03-15 Pavel Safronov	27	const normalized = normalizeColor(hexColor);
	28	if (!normalized) return '#0f172a';
	29
	30	const r = parseInt(normalized.slice(1, 3), 16);
	31	const g = parseInt(normalized.slice(3, 5), 16);
	32	const b = parseInt(normalized.slice(5, 7), 16);
	33	const luminance = 0.2126 * r + 0.7152 * g + 0.0722 * b;
	34
	35	return luminance > 145 ? '#0f172a' : '#f8fafc';
	36	};
	37
`b4e7f682` 2026-03-16 Pavel Safronov	38	export const getArrowDisplayColor = (hexColor: string) => {
`36d64b37` 2026-03-15 Pavel Safronov	39	if (!document.body.classList.contains('dark')) return hexColor;
	40	const normalized = normalizeColor(hexColor);
	41	if (!normalized) return '#ffffff';
	42
	43	const r = parseInt(normalized.slice(1, 3), 16) / 255;
	44	const g = parseInt(normalized.slice(3, 5), 16) / 255;
	45	const b = parseInt(normalized.slice(5, 7), 16) / 255;
	46	const luminance = 0.2126 * r + 0.7152 * g + 0.0722 * b;
	47	return luminance < 0.2 ? '#ffffff' : hexColor;
	48	};
	49
`e4870993` 2026-03-16 Pavel Safronov	50	export type PresenceThresholds = {
	51	onlineGraceMs: number;
	52	recentlyOfflineMs: number;
	53	};
	54
`b4e7f682` 2026-03-16 Pavel Safronov	55	export const getFriendPresenceState = (friend: FriendLike, now: number, thresholds: PresenceThresholds): 'online' \| 'recent-offline' \| 'stale-offline' => {
`cf7471ca` 2026-03-16 Pavel Safronov	56	const friendTimestamp = Number(friend.lastSeen ?? friend.timestamp);
`e4870993` 2026-03-16 Pavel Safronov	57	if (!Number.isFinite(friendTimestamp)) return 'stale-offline';
	58	const ageMs = Math.max(0, now - friendTimestamp);
	59	if (ageMs <= thresholds.onlineGraceMs) return 'online';
	60	if (ageMs <= thresholds.recentlyOfflineMs) return 'recent-offline';
	61	return 'stale-offline';
	62	};
	63
`36d64b37` 2026-03-15 Pavel Safronov	64	export const getDeviceHint = async () => {
`b4e7f682` 2026-03-16 Pavel Safronov	65	const userAgentData = (navigator as Navigator & { userAgentData?: UserAgentDataWithModel }).userAgentData;
	66	if (userAgentData) {
`36d64b37` 2026-03-15 Pavel Safronov	67	try {
`b4e7f682` 2026-03-16 Pavel Safronov	68	const data = await userAgentData.getHighEntropyValues(['model']);
`36d64b37` 2026-03-15 Pavel Safronov	69	if (data.model) return data.model;
	70	} catch {
	71	// Fall through to UA parsing.
	72	}
	73	}
	74
	75	const ua = navigator.userAgent;
	76	if (/iPhone/.test(ua)) return 'iPhone';
	77	if (/iPad/.test(ua)) return 'iPad';
	78
	79	const androidModel = ua.match(/;\s*([^;]+?)\s+Build\//);
	80	if (androidModel) return androidModel[1];
	81
	82	if (/Android/.test(ua)) return 'Android';
	83	if (/Mac/.test(ua)) return 'Mac';
	84	if (/Windows/.test(ua)) return 'PC';
	85	if (/Linux/.test(ua)) return 'Linux';
	86	return null;
	87	};
	88
	89	export const createRandomUserName = async () => {
	90	const hint = await getDeviceHint();
	91	const suffix = Math.floor(1000 + Math.random() * 9000);
	92	return hint ? `${hint} ${suffix}` : `User ${suffix}`;
	93	};
	94
	95	export const createRandomColor = () => `#${Math.floor(Math.random() * 0x1000000).toString(16).padStart(6, '0')}`;