import { Message } from 'ai'
import { clsx, type ClassValue } from 'clsx'
import { customAlphabet } from 'nanoid'
import { twMerge } from 'tailwind-merge'

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

export const nanoid = customAlphabet(
  '0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz',
  7
) // 7-character random string

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

function pause(duration: number): Promise<void> {
  return new Promise((res) => setTimeout(res, duration * 1000));
}

export function truncateString(str: string, maxLength?: number): string {
  const length = maxLength || 100; // 如果没有传入 maxLength 参数，则默认为 100
  if (str.length > length) {
    // return str.substring(0, 100) + '...'; 
    return str.substring(0, length);
  } else {
    return str;
  }
}




export async function fetcher<JSON = any>(
  input: RequestInfo,
  init?: RequestInit
): Promise<JSON> {
  const res = await fetch(input, init)

  if (!res.ok) {
    const json = await res.json()
    if (json.error) {
      const error = new Error(json.error) as Error & {
        status: number
      }
      error.status = res.status
      throw error
    } else {
      throw new Error('An unexpected error occurred')
    }
  }

  return res.json()
}

export function formatDate(input: string | number | Date): string {
  const date = new Date(Number(input))
  return date.toLocaleDateString('en-US', {
    month: 'long',
    day: 'numeric',
    year: 'numeric'
  })
}

export function isValidEmail(email: string): boolean {
  const regex = /^[^\s@]+@[^\s@]+\.[^\s@]+$/
  return regex.test(email)
}

export function filterMessages(messages: Message[]): Message[] {
  return messages.filter(
    message => message.role !== 'system' && message.role !== 'function'
  )
}