import type { ChatMessage } from '@/types/business/service'

// TODO(api): 待接口文档到位后，将以下 mock 替换为 request<T> 调用

let seq = 0

function nextId(prefix: string): string {
  seq += 1
  return `${prefix}-${Date.now()}-${seq}`
}

function nowTime(): string {
  const date = new Date()
  const pad = (n: number): string => (n < 10 ? `0${n}` : String(n))
  return `今天 ${pad(date.getHours())}:${pad(date.getMinutes())}`
}

export function getChatHistory(): Promise<ChatMessage[]> {
  return Promise.resolve([
    {
      id: 'chat-001',
      role: 'assistant',
      content: '您好，欢迎咨询智联智造平台!我是您的专属客服小助手，请问有什么可以帮您的?',
      time: '今天 10:23',
    },
    {
      id: 'chat-002',
      role: 'user',
      content: '我想咨询一下物联网全案开发的流程和周期',
      time: '今天 10:23',
    },
    {
      id: 'chat-003',
      role: 'assistant',
      content: '',
      file: { name: '物联网全案服务介绍.pdf', size: 2.5 * 1024 * 1024 },
      time: '今天 10:24',
    },
  ])
}

export function sendChatMessage(content: string): Promise<ChatMessage> {
  return Promise.resolve({
    id: nextId('chat'),
    role: 'user',
    content,
    time: nowTime(),
  })
}

export function uploadChatFile(file: File): Promise<ChatMessage> {
  return Promise.resolve({
    id: nextId('chat'),
    role: 'user',
    content: '',
    file: { name: file.name, size: file.size },
    time: nowTime(),
  })
}

export function mockAutoReply(): Promise<ChatMessage> {
  return Promise.resolve({
    id: nextId('chat'),
    role: 'assistant',
    content: '收到您的消息，专属客服稍后为您答复～',
    time: nowTime(),
  })
}