'use client';

/* IMPORT */
import { Button } from '@/components/ui/button';
import { Check, ChevronsUpDown } from 'lucide-react';
import { cn } from '@/lib/utils';
import {
  Command,
  CommandEmpty,
  CommandGroup,
  CommandInput,
  CommandItem,
} from '@/components/ui/command';
import {
  Popover,
  PopoverContent,
  PopoverTrigger,
} from '@/components/ui/popover';
import { useMemo, useState } from 'react';
import { User } from '@/db/schema';

// ----------------------------------------------------------------------------------------------------

/* TYPES */
interface UserComboBoxProps {
  users: Partial<User>[];
  value: number | null;
  onChange: (value: number) => void;
  placeholder?: string;
  disabled?: boolean;
}

// ----------------------------------------------------------------------------------------------------

/* User Combo Box Component */
function UserComboBox(props: UserComboBoxProps) {
  const {
    users,
    value,
    onChange,
    placeholder = '담당자 선택...',
    disabled = false,
  } = props;
  const [open, setOpen] = useState(false);
  const [inputValue, setInputValue] = useState('');
  const selectedUser = 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.deptName && (
                <span className="ml-2 text-xs text-muted-foreground">
                  ({selectedUser.deptName})
                </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 존재하지 않습니다.</CommandEmpty>
          <CommandGroup className="max-h-[200px] overflow-y-auto">
            {users.map((user) => (
              <CommandItem
                key={user.id}
                value={user.name}
                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.deptName && (
                      <span className="ml-2 text-xs text-muted-foreground">
                        ({user.deptName})
                      </span>
                    )}
                  </div>
                  <span className="text-xs text-muted-foreground truncate">
                    {user.email}
                  </span>
                </div>
              </CommandItem>
            ))}
          </CommandGroup>
        </Command>
      </PopoverContent>
    </Popover>
  )
}

// ----------------------------------------------------------------------------------------------------

/* EXPORT */
export default UserComboBox;