import { useState, useRef } from "react"
import { toast } from "sonner"
import { useMutation, useQueryClient } from "@tanstack/react-query"
import { attachmentApi } from '../../lib/api-services'
import Card from "../../components/ui/Card"
import Button from "../../components/ui/Button"
import { Select } from "../../components/ui/Input"
import { Paperclip, Trash2, Eye, Download } from "lucide-react"

export default function AttachmentInfo({ employeeId, attachments }: { employeeId: string; attachments: any[] }) {
  const queryClient = useQueryClient()
  const fileInputRef = useRef<HTMLInputElement>(null)
  const [fileType, setFileType] = useState<'ID_CARD' | 'BANK_CARD' | 'EDUCATION' | 'CERTIFICATE' | 'CONTRACT' | 'PHOTO' | 'OTHER'>('ID_CARD')

  const addAttachmentMutation = useMutation({
    mutationFn: (data: any) => attachmentApi.add(data),
    onSuccess: () => queryClient.invalidateQueries({ queryKey: ['roster-profile', employeeId] }),
  })

  const deleteAttachmentMutation = useMutation({
    mutationFn: (id: string) => attachmentApi.remove(id),
    onSuccess: () => queryClient.invalidateQueries({ queryKey: ['roster-profile', employeeId] }),
  })

  const handleFileUpload = (e: React.ChangeEvent<HTMLInputElement>) => {
    const file = e.target.files?.[0]
    if (!file) return

    // 文件类型校验
    const allowedExts = ['.pdf', '.jpg', '.jpeg', '.png', '.heic', '.gif', '.bmp', '.webp', '.doc', '.docx', '.xls', '.xlsx', '.tiff', '.tif']
    const ext = file.name.toLowerCase().substring(file.name.lastIndexOf('.'))
    if (!allowedExts.includes(ext)) {
      toast.error('不支持的文件格式，支持 PDF、图片、Word、Excel 等常见格式')
      return
    }

    // 文件大小校验（10MB）
    const maxSize = 10 * 1024 * 1024
    if (file.size > maxSize) {
      toast.error(`文件过大，请上传小于 10MB 的文件（当前: ${formatSize(file.size)}）`)
      return
    }

    const reader = new FileReader()
    reader.onload = (event) => {
      const fileUrl = event.target?.result as string
      addAttachmentMutation.mutate({ employeeId, fileName: file.name, fileType, fileUrl, fileSize: file.size })
    }
    reader.readAsDataURL(file)
  }

  const fileTypeLabels: Record<string, string> = { ID_CARD: '身份证', BANK_CARD: '银行卡', EDUCATION: '学历证书', CERTIFICATE: '职业资格证书', CONTRACT: '合同扫描件', PHOTO: '员工照片', OTHER: '其他' }
  const fileTypeColors: Record<string, string> = { ID_CARD: 'bg-blue-50 text-blue-600', BANK_CARD: 'bg-green-50 text-safe', EDUCATION: 'bg-amber-50 text-amber-600', CERTIFICATE: 'bg-purple-50 text-purple-600', CONTRACT: 'bg-cyan-50 text-cyan-600', PHOTO: 'bg-pink-50 text-pink-600', OTHER: 'bg-gray-100 text-gray-500' }

  const formatSize = (bytes: number) => {
    if (!bytes) return '-'
    if (bytes < 1024) return `${bytes}B`
    if (bytes < 1024 * 1024) return `${(bytes / 1024).toFixed(0)}KB`
    return `${(bytes / 1024 / 1024).toFixed(1)}MB`
  }

  return (
    <div className="space-y-3">
      <h2 className="text-xs font-medium">附件管理（{attachments?.length || 0}个）</h2>
      <Card>
        <div className="flex gap-2 mb-3 flex-nowrap items-center">
          <Select value={fileType} onChange={(e) => setFileType(e.target.value as any)} className="text-xs !w-32 shrink-0">
            <option value="ID_CARD">身份证</option><option value="BANK_CARD">银行卡</option><option value="EDUCATION">学历证书</option><option value="CERTIFICATE">职业资格证书</option><option value="CONTRACT">合同扫描件</option><option value="PHOTO">员工照片</option><option value="OTHER">其他</option>
          </Select>
          <input ref={fileInputRef} type="file" className="hidden" onChange={handleFileUpload} />
          <Button size="sm" variant="secondary" onClick={() => fileInputRef.current?.click()} disabled={addAttachmentMutation.isPending} className="shrink-0 whitespace-nowrap">
            {addAttachmentMutation.isPending ? '上传中...' : '上传附件'}
          </Button>
          <span className="text-gray-400 text-xs">支持 PDF/JPG/PNG，最大 10MB</span>
        </div>
        {attachments?.length ? (
          <div className="space-y-2">
            {attachments.map((att) => (
              <div key={att.id} className="flex items-center justify-between bg-gray-50 rounded p-2.5 text-xs hover:bg-gray-100">
                <div className="flex items-center gap-2 min-w-0">
                  <Paperclip className="w-4 h-4 text-gray-400 shrink-0" />
                  <div className="min-w-0">
                    <div className="truncate font-medium text-gray-700">{att.fileName}</div>
                    <div className="flex items-center gap-2 mt-0.5">
                      <span className={`px-1.5 py-0.5 rounded text-xs ${fileTypeColors[att.fileType] || 'bg-gray-100 text-gray-500'}`}>{fileTypeLabels[att.fileType] || att.fileType}</span>
                      <span className="text-gray-400">{formatSize(att.fileSize)}</span>
                      <span className="text-gray-400">{new Date(att.createdAt).toLocaleDateString('zh-CN')}</span>
                    </div>
                  </div>
                </div>
                <div className="flex items-center gap-1.5 shrink-0 ml-2">
                  <button onClick={() => window.open(att.fileUrl, '_blank')} className="text-gray-400 hover:text-blue-600" title="查看">
                    <Eye className="w-4 h-4" />
                  </button>
                  <a href={att.fileUrl} download={att.fileName} className="text-gray-400 hover:text-blue-600" title="下载">
                    <Download className="w-4 h-4" />
                  </a>
                  <button onClick={() => deleteAttachmentMutation.mutate(att.id)} className="text-gray-300 hover:text-danger" title="删除">
                    <Trash2 className="w-4 h-4" />
                  </button>
                </div>
              </div>
            ))}
          </div>
        ) : <div className="text-gray-400 text-xs text-center py-4">暂无附件</div>}
      </Card>
    </div>
  )
}