shadcn/app/registry/default/ui/combobox.tsx

"use client"

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

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

export interface ComboboxOption {
  value: string
  label: string
}

export interface ComboboxProps {
  options: ComboboxOption[]
  value?: string
  onChange?: (value: string) => void
  placeholder?: string
  emptyText?: string
}

export function Combobox({
  options,
  value,
  onChange,
  placeholder = "Select option...",
  emptyText = "No option found.",
}: ComboboxProps) {
  const [open, setOpen] = React.useState(false)
  const [searchValue, setSearchValue] = React.useState("")

  return (
    <Popover open={open} onOpenChange={setOpen}>
      <PopoverTrigger asChild>
        <Button
          variant="outline"
          role="combobox"
          aria-expanded={open}
          className="w-full justify-between"
        >
          {value
            ? options.find((option) => option.value === value)?.label
            : placeholder}
          <ChevronsUpDown className="ml-2 h-4 w-4 shrink-0 opacity-50" />
        </Button>
      </PopoverTrigger>
      <PopoverContent className="w-full p-0">
        <Command>
          <CommandInput
            placeholder="Search..."
            value={searchValue}
            onValueChange={setSearchValue}
          />
          <CommandList>
            <CommandEmpty>{emptyText}</CommandEmpty>
            <CommandGroup>
              {options.map((option) => (
                <CommandItem
                  key={option.value}
                  value={option.value}
                  onSelect={(currentValue) => {
                    onChange?.(currentValue === value ? "" : currentValue)
                    setOpen(false)
                  }}
                >
                  <Check
                    className={cn(
                      "mr-2 h-4 w-4",
                      value === option.value ? "opacity-100" : "opacity-0"
                    )}
                  />
                  {option.label}
                </CommandItem>
              ))}
            </CommandGroup>
          </CommandList>
        </Command>
      </PopoverContent>
    </Popover>
  )
}