"use client"

import * as React from "react"
import { Check, ChevronsUpDown } from "lucide-react"

import { cn } from "@/lib/utils"
import { Button } from "@/components/ui/button"
import {
  Command,
  CommandEmpty,
  CommandGroup,
  CommandInput,
  CommandItem,
} from "@/components/ui/command"
import {
  Popover,
  PopoverContent,
  PopoverTrigger,
} from "@/components/ui/popover"

interface User {
  id: number
  name: string
  email: string
  department?: string
}

interface UserComboboxProps {
  users: User[]
  value: number | null
  onChange: (value: number) => void
  placeholder?: string
  disabled?: boolean
}

export function UserCombobox({
  users,
  value,
  onChange,
  placeholder = "담당자 선택...",
  disabled = false
}: UserComboboxProps) {
  const [open, setOpen] = React.useState(false)
  const [inputValue, setInputValue] = React.useState("")
  
  const selectedUser = React.useMemo(() => {
    return users.find(user => user.id === value)
  }, [users, value])

  return (
    <Popover open={open} onOpenChange={setOpen}>
      <PopoverTrigger asChild>
        <Button
          variant="outline"
          role="combobox"
          aria-expanded={open}
          className={cn(
            "w-full justify-between",
            !value && "text-muted-foreground"
          )}
          disabled={disabled}
        >
          {selectedUser ? (
            <span className="flex items-center">
              <span className="font-medium">{selectedUser.name}</span>
              {selectedUser.department && (
                <span className="ml-2 text-xs text-muted-foreground">
                  ({selectedUser.department})
                </span>
              )}
            </span>
          ) : (
            placeholder
          )}
          <ChevronsUpDown className="ml-2 h-4 w-4 shrink-0 opacity-50" />
        </Button>
      </PopoverTrigger>
      <PopoverContent className="w-[300px] p-0">
        <Command>
          <CommandInput 
            placeholder="담당자 검색..." 
            value={inputValue}
            onValueChange={setInputValue}
          />
          <CommandEmpty>검색 결과가 없습니다.</CommandEmpty>
          <CommandGroup className="max-h-[200px] overflow-y-auto">
            {users.map((user) => (
              <CommandItem
                key={user.id}
                value={`${user.name} ${user.email}`} // 이메일 및 이름을 value로 사용
                onSelect={() => {
                  onChange(user.id)
                  setOpen(false)
                }}
              >
                <Check
                  className={cn(
                    "mr-2 h-4 w-4",
                    value === user.id ? "opacity-100" : "opacity-0"
                  )}
                />
                <div className="flex flex-col truncate">
                  <div className="flex items-center">
                    <span className="font-medium">{user.name}</span>
                    {user.department && (
                      <span className="ml-2 text-xs text-muted-foreground">
                        ({user.department})
                      </span>
                    )}
                  </div>
                  <span className="text-xs text-muted-foreground truncate">
                    {user.email}
                  </span>
                </div>
              </CommandItem>
            ))}
          </CommandGroup>
        </Command>
      </PopoverContent>
    </Popover>
  )
}