import { clsx, type ClassValue } from 'clsx';
import { twMerge } from 'tailwind-merge';

export function cn(...inputs: ClassValue[]) {
    return twMerge(clsx(inputs));
}

export function formatNumber(n: number): string {
    if (n >= 1_000_000) return (n / 1_000_000).toFixed(1) + 'M';
    if (n >= 1_000) return (n / 1_000).toFixed(1) + 'K';
    return String(n);
}

export function formatRelativeTime(iso: string | null): string {
    if (!iso) return 'never';
    const then = new Date(iso).getTime();
    if (isNaN(then)) return 'unknown';
    const diff = Date.now() - then;
    const minutes = Math.floor(diff / 60_000);
    if (minutes < 1) return 'just now';
    if (minutes < 60) return `${minutes}m ago`;
    const hours = Math.floor(minutes / 60);
    if (hours < 24) return `${hours}h ago`;
    const days = Math.floor(hours / 24);
    return `${days}d ago`;
}

export function agentColor(type: string | null): string {
    const map: Record<string, string> = {
        gpt: '#10a37f',
        claude: '#a855f7',
        google: '#ea4335',
        perplexity: '#20b2aa',
        bing: '#008ad8',
        xai: '#1d9bf0',
        deepseek: '#4b6bfb',
        mistral: '#ff7000',
        meta: '#0866ff',
        apple: '#a6a6a6',
        amazon: '#ff9900',
        bytedance: '#25f4ee',
        cohere: '#39c5ac',
        other: '#6b7280',
        human: '#3b82f6',
    };
    return map[type || 'other'] || '#6b7280';
}