// Utility helpers for the frontend

/**
 * Format currency in INR
 */
export function formatCurrency(amount) {
	if (amount == null) return '₹0.00';
	return new Intl.NumberFormat('en-IN', {
		style: 'currency',
		currency: 'INR',
		minimumFractionDigits: 2
	}).format(amount);
}

/**
 * Format date/time
 */
export function formatDate(dateStr, options = {}) {
	if (!dateStr) return '-';
	const date = new Date(dateStr);
	return new Intl.DateTimeFormat('en-IN', {
		dateStyle: 'medium',
		timeStyle: 'short',
		...options
	}).format(date);
}

/**
 * Format time only
 */
export function formatTime(dateStr) {
	if (!dateStr) return '-';
	return new Intl.DateTimeFormat('en-IN', { timeStyle: 'short' }).format(new Date(dateStr));
}

/**
 * Time elapsed since a date (e.g., "5 min ago")
 */
export function timeAgo(dateStr) {
	if (!dateStr) return '';
	const now = Date.now();
	const then = new Date(dateStr).getTime();
	const diff = Math.floor((now - then) / 1000);

	if (diff < 60) return `${diff}s`;
	if (diff < 3600) return `${Math.floor(diff / 60)}m`;
	if (diff < 86400) return `${Math.floor(diff / 3600)}h`;
	return `${Math.floor(diff / 86400)}d`;
}

/**
 * Timer display (mm:ss) from a start date
 */
export function elapsedTimer(dateStr) {
	if (!dateStr) return '00:00';
	const diff = Math.floor((Date.now() - new Date(dateStr).getTime()) / 1000);
	const mins = Math.floor(diff / 60);
	const secs = diff % 60;
	return `${String(mins).padStart(2, '0')}:${String(secs).padStart(2, '0')}`;
}

/**
 * Debounce function
 */
export function debounce(fn, delay = 300) {
	let timer;
	return (...args) => {
		clearTimeout(timer);
		timer = setTimeout(() => fn(...args), delay);
	};
}

/**
 * Generate a short ID for local use
 */
export function shortId() {
	return Math.random().toString(36).substring(2, 9);
}

/**
 * Capitalize first letter
 */
export function capitalize(str) {
	if (!str) return '';
	return str.charAt(0).toUpperCase() + str.slice(1).toLowerCase();
}

/**
 * Truncate string
 */
export function truncate(str, len = 30) {
	if (!str || str.length <= len) return str || '';
	return str.substring(0, len) + '...';
}

/**
 * Get order source display label
 */
export function orderSourceLabel(source) {
	const labels = {
		dine_in: 'Dine In',
		take_away: 'Takeaway',
		takeaway: 'Takeaway',
		delivery: 'Delivery',
		website: 'Website',
		whatsapp: 'WhatsApp',
		swiggy: 'Swiggy',
		zomato: 'Zomato',
		qr_table: 'QR Order',
		qr: 'QR Order'
	};
	return labels[source] || capitalize(source);
}

/**
 * Get status color class
 */
export function statusColor(status) {
	const colors = {
		pending: 'badge-warning',
		preparing: 'badge-info',
		ready: 'badge-success',
		served: 'badge-success',
		completed: 'badge-success',
		cancelled: 'badge-danger',
		voided: 'badge-danger',
		available: 'badge-success',
		occupied: 'badge-danger',
		reserved: 'badge-warning',
		cleaning: 'badge-info'
	};
	return colors[status] || 'badge-info';
}

/**
 * Kitchen station label
 */
export function stationLabel(station) {
	const labels = {
		south_indian: 'South Indian',
		chinese: 'Chinese',
		tandoor: 'Tandoor',
		juice: 'Juice Bar',
		bakery: 'Bakery',
		main: 'Main Kitchen',
		bar: 'Bar'
	};
	return labels[station] || capitalize(station);
}

/**
 * Play notification sound
 */
export function playSound(type = 'notify') {
	try {
		const ctx = new (window.AudioContext || window.webkitAudioContext)();
		const osc = ctx.createOscillator();
		const gain = ctx.createGain();
		osc.connect(gain);
		gain.connect(ctx.destination);

		if (type === 'order') {
			osc.frequency.value = 880;
			gain.gain.value = 0.3;
			osc.start();
			osc.stop(ctx.currentTime + 0.15);
			setTimeout(() => {
				const osc2 = ctx.createOscillator();
				osc2.connect(gain);
				osc2.frequency.value = 1100;
				osc2.start();
				osc2.stop(ctx.currentTime + 0.15);
			}, 180);
		} else {
			osc.frequency.value = 660;
			gain.gain.value = 0.2;
			osc.start();
			osc.stop(ctx.currentTime + 0.1);
		}
	} catch {
		// Audio not available
	}
}

/**
 * Check if user has a specific role
 */
export function hasRole(user, ...roles) {
	if (!user?.role?.name) return false;
	return roles.includes(user.role.name.toLowerCase());
}

/**
 * Calculate GST breakdown
 */
export function calculateGST(amount, gstRate = 5) {
	const gstAmount = (amount * gstRate) / 100;
	return {
		base: amount,
		cgst: gstAmount / 2,
		sgst: gstAmount / 2,
		total: amount + gstAmount,
		rate: gstRate
	};
}