/**
 * Formatting utilities for CS2 data
 */

/**
 * Premier rating tier information
 */
export interface PremierRatingTier {
	/** Formatted rating with comma separator (e.g., "15,000") */
	formatted: string;
	/** Hex color for this tier */
	color: string;
	/** Tier name */
	tier: string;
	/** Tailwind CSS classes for styling */
	cssClasses: string;
}

/**
 * Format Premier rating and return tier information
 * CS2 Premier rating range: 0-30000
 * Color tiers: <5000 (gray), 5000-9999 (blue), 10000-14999 (purple),
 *              15000-19999 (pink), 20000-24999 (red), 25000+ (gold)
 *
 * @param rating - Premier rating (0-30000)
 * @returns Tier information with formatted rating and colors
 */
export function formatPremierRating(rating: number | undefined | null): PremierRatingTier {
	// Default for unranked/unknown
	if (rating === undefined || rating === null || rating === 0) {
		return {
			formatted: 'Unranked',
			color: '#9CA3AF',
			tier: 'Unranked',
			cssClasses: 'bg-base-300/50 border-base-content/20 text-base-content/60'
		};
	}

	// Ensure rating is within valid range
	const validRating = Math.max(0, Math.min(30000, rating));
	const formatted = validRating.toLocaleString('en-US');

	// Determine tier based on rating
	if (validRating >= 25000) {
		return {
			formatted,
			color: '#EAB308',
			tier: 'Legendary',
			cssClasses:
				'bg-gradient-to-br from-yellow-500/20 to-amber-600/20 border-yellow-500/40 text-yellow-400 font-bold shadow-lg shadow-yellow-500/20'
		};
	} else if (validRating >= 20000) {
		return {
			formatted,
			color: '#EF4444',
			tier: 'Elite',
			cssClasses:
				'bg-gradient-to-br from-red-500/20 to-rose-600/20 border-red-500/40 text-red-400 font-semibold shadow-md shadow-red-500/10'
		};
	} else if (validRating >= 15000) {
		return {
			formatted,
			color: '#EC4899',
			tier: 'Expert',
			cssClasses:
				'bg-gradient-to-br from-pink-500/20 to-fuchsia-500/20 border-pink-500/40 text-pink-400 font-semibold shadow-md shadow-pink-500/10'
		};
	} else if (validRating >= 10000) {
		return {
			formatted,
			color: '#A855F7',
			tier: 'Advanced',
			cssClasses:
				'bg-gradient-to-br from-purple-500/20 to-violet-600/20 border-purple-500/40 text-purple-400 font-medium'
		};
	} else if (validRating >= 5000) {
		return {
			formatted,
			color: '#3B82F6',
			tier: 'Intermediate',
			cssClasses:
				'bg-gradient-to-br from-blue-500/20 to-indigo-500/20 border-blue-500/40 text-blue-400'
		};
	} else {
		return {
			formatted,
			color: '#9CA3AF',
			tier: 'Beginner',
			cssClasses: 'bg-gray-500/10 border-gray-500/30 text-gray-400'
		};
	}
}

/**
 * Get Tailwind CSS classes for Premier rating badge
 * @param rating - Premier rating (0-30000)
 * @returns Tailwind CSS class string
 */
export function getPremierRatingClass(rating: number | undefined | null): string {
	return formatPremierRating(rating).cssClasses;
}

/**
 * Calculate rating change display
 * @param oldRating - Previous rating
 * @param newRating - New rating
 * @returns Object with change amount and display string
 */
export function getPremierRatingChange(
	oldRating: number | undefined | null,
	newRating: number | undefined | null
): {
	change: number;
	display: string;
	isPositive: boolean;
	cssClasses: string;
} | null {
	if (
		oldRating === undefined ||
		oldRating === null ||
		newRating === undefined ||
		newRating === null
	) {
		return null;
	}

	const change = newRating - oldRating;

	if (change === 0) {
		return {
			change: 0,
			display: '±0',
			isPositive: false,
			cssClasses: 'text-base-content/60'
		};
	}

	const isPositive = change > 0;
	const display = isPositive ? `+${change}` : change.toString();

	return {
		change,
		display,
		isPositive,
		cssClasses: isPositive ? 'text-success font-semibold' : 'text-error font-semibold'
	};
}

/**
 * Format K/D ratio
 * @param kills - Number of kills
 * @param deaths - Number of deaths
 * @returns Formatted K/D ratio
 */
export function formatKD(kills: number, deaths: number): string {
	if (deaths === 0) {
		return kills.toFixed(2);
	}
	return (kills / deaths).toFixed(2);
}

/**
 * Format percentage
 * @param value - Percentage value (0-100)
 * @param decimals - Number of decimal places (default: 1)
 * @returns Formatted percentage string
 */
export function formatPercent(value: number | undefined | null, decimals = 1): string {
	if (value === undefined || value === null) {
		return '0.0%';
	}
	return `${value.toFixed(decimals)}%`;
}

/**
 * Format duration in seconds to MM:SS
 * @param seconds - Duration in seconds
 * @returns Formatted duration string
 */
export function formatDuration(seconds: number): string {
	const mins = Math.floor(seconds / 60);
	const secs = seconds % 60;
	return `${mins}:${secs.toString().padStart(2, '0')}`;
}

/**
 * Format large numbers with comma separators
 * @param value - Number to format
 * @returns Formatted number string
 */
export function formatNumber(value: number | undefined | null): string {
	if (value === undefined || value === null) {
		return '0';
	}
	return value.toLocaleString('en-US');
}