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

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

export function formatDate(date: string | Date): string {
  const d = new Date(date)
  return d.toLocaleString('zh-CN', {
    year: 'numeric',
    month: '2-digit',
    day: '2-digit',
    hour: '2-digit',
    minute: '2-digit',
    second: '2-digit',
  })
}

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 n.toLocaleString()
}

export function maskApiKey(key?: string): string {
  if (!key) return '-'
  if (key.length <= 8) return '****'
  return `${key.slice(0, 4)}${'*'.repeat(key.length - 8)}${key.slice(-4)}`
}

export function sleep(ms: number): Promise<void> {
  return new Promise(resolve => setTimeout(resolve, ms))
}

/** 从 SWR error 中提取用户可见消息，过滤 abort 错误 */
export function getSwrErrorMessage(err: unknown): string | undefined {
  if (!err) return undefined
  if (err instanceof DOMException && err.name === 'AbortError') return undefined
  if (err instanceof Error) {
    if (err.name === 'AbortError' || err.message?.includes('aborted')) return undefined
    return err.message
  }
  return String(err)
}