// Date/time formatting utilities

/**
 * Format ISO 8601 timestamp to user-friendly format
 * @param isoString ISO 8601 timestamp string
 * @returns Formatted date string like "Nov 10, 2025 3:45 PM"
 */
export function formatDateTime(isoString: string): string {
	const date = new Date(isoString);
	return date.toLocaleString('en-US', {
		month: 'short',
		day: 'numeric',
		year: 'numeric',
		hour: 'numeric',
		minute: '2-digit',
		hour12: true
	});
}

/**
 * Format ISO 8601 timestamp to short format
 * @param isoString ISO 8601 timestamp string
 * @returns Formatted date string like "Nov 10, 3:45 PM"
 */
export function formatDateTimeShort(isoString: string): string {
	const date = new Date(isoString);
	return date.toLocaleString('en-US', {
		month: 'short',
		day: 'numeric',
		hour: 'numeric',
		minute: '2-digit',
		hour12: true
	});
}

/**
 * Format ISO 8601 timestamp to just date
 * @param isoString ISO 8601 timestamp string
 * @returns Formatted date string like "November 10, 2025"
 */
export function formatDate(isoString: string): string {
	const date = new Date(isoString);
	return date.toLocaleDateString('en-US', {
		month: 'long',
		day: 'numeric',
		year: 'numeric'
	});
}

/**
 * Format ISO 8601 timestamp to just time
 * @param isoString ISO 8601 timestamp string
 * @returns Formatted time string like "3:45 PM"
 */
export function formatTime(isoString: string): string {
	const date = new Date(isoString);
	return date.toLocaleTimeString('en-US', {
		hour: 'numeric',
		minute: '2-digit',
		hour12: true
	});
}

/**
 * Format ISO 8601 timestamp to relative time
 * @param isoString ISO 8601 timestamp string
 * @returns Relative time string like "2 hours ago" or "just now"
 */
export function formatRelativeTime(isoString: string): string {
	const date = new Date(isoString);
	const now = new Date();
	const diffMs = now.getTime() - date.getTime();
	const diffSec = Math.floor(diffMs / 1000);
	const diffMin = Math.floor(diffSec / 60);
	const diffHour = Math.floor(diffMin / 60);
	const diffDay = Math.floor(diffHour / 24);

	if (diffSec < 60) {
		return 'just now';
	} else if (diffMin < 60) {
		return `${diffMin} minute${diffMin !== 1 ? 's' : ''} ago`;
	} else if (diffHour < 24) {
		return `${diffHour} hour${diffHour !== 1 ? 's' : ''} ago`;
	} else if (diffDay < 7) {
		return `${diffDay} day${diffDay !== 1 ? 's' : ''} ago`;
	} else {
		return formatDate(isoString);
	}
}

/**
 * Convert Unix seconds timestamp to ISO 8601 string
 * @param unixSeconds Unix timestamp in seconds
 * @returns ISO 8601 timestamp string
 */
export function unixToISO(unixSeconds: number): string {
	return new Date(unixSeconds * 1000).toISOString();
}

/**
 * Convert ISO 8601 string to Unix seconds timestamp
 * @param isoString ISO 8601 timestamp string
 * @returns Unix timestamp in seconds
 */
export function isoToUnix(isoString: string): number {
	return Math.floor(new Date(isoString).getTime() / 1000);
}