go-chi-oapi-codegen-todolist/frontend/components/multi-select.tsx

"use client"

import * as React from "react"
import { X } from "lucide-react"
import { Badge } from "@/components/ui/badge"
import { Command, CommandGroup, CommandItem } from "@/components/ui/command"
import { Command as CommandPrimitive } from "cmdk"

interface MultiSelectProps {
  options: { label: string; value: string }[]
  selected: string[]
  onChange: (selected: string[]) => void
  placeholder?: string
}

export function MultiSelect({ options, selected, onChange, placeholder = "Select options" }: MultiSelectProps) {
  const inputRef = React.useRef<HTMLInputElement>(null)
  const [open, setOpen] = React.useState(false)
  const [inputValue, setInputValue] = React.useState("")

  const handleUnselect = (value: string) => {
    onChange(selected.filter((s) => s !== value))
  }

  const handleSelect = (value: string) => {
    if (selected.includes(value)) {
      onChange(selected.filter((s) => s !== value))
    } else {
      onChange([...selected, value])
    }
  }

  const handleKeyDown = (e: React.KeyboardEvent<HTMLDivElement>) => {
    const input = inputRef.current
    if (input) {
      if (e.key === "Delete" || e.key === "Backspace") {
        if (input.value === "" && selected.length > 0) {
          onChange(selected.slice(0, -1))
        }
      }
      if (e.key === "Escape") {
        input.blur()
      }
    }
  }

  const selectedOptions = options.filter((option) => selected.includes(option.value))

  return (
    <Command onKeyDown={handleKeyDown} className="overflow-visible bg-transparent">
      <div className="group border rounded-md px-3 py-2 text-sm ring-offset-background focus-within:ring-2 focus-within:ring-ring focus-within:ring-offset-2">
        <div className="flex flex-wrap gap-1">
          {selectedOptions.map((option) => (
            <Badge key={option.value} variant="secondary" className="rounded-sm">
              {option.label}
              <button
                className="ml-1 rounded-full outline-none ring-offset-background focus:ring-2 focus:ring-ring focus:ring-offset-2"
                onKeyDown={(e) => {
                  if (e.key === "Enter") {
                    handleUnselect(option.value)
                  }
                }}
                onMouseDown={(e) => {
                  e.preventDefault()
                  e.stopPropagation()
                }}
                onClick={() => handleUnselect(option.value)}
              >
                <X className="h-3 w-3 text-muted-foreground hover:text-foreground" />
              </button>
            </Badge>
          ))}
          <CommandPrimitive.Input
            ref={inputRef}
            value={inputValue}
            onValueChange={setInputValue}
            onBlur={() => setOpen(false)}
            onFocus={() => setOpen(true)}
            placeholder={selected.length === 0 ? placeholder : undefined}
            className="ml-2 flex-1 bg-transparent outline-none placeholder:text-muted-foreground"
          />
        </div>
      </div>
      <div className="relative mt-2">
        {open && options.length > 0 && (
          <div className="absolute top-0 z-10 w-full rounded-md border bg-popover text-popover-foreground shadow-md outline-none animate-in">
            <CommandGroup className="h-full overflow-auto max-h-[200px]">
              {options.map((option) => {
                const isSelected = selected.includes(option.value)
                return (
                  <CommandItem
                    key={option.value}
                    onMouseDown={(e) => {
                      e.preventDefault()
                      e.stopPropagation()
                    }}
                    onSelect={() => handleSelect(option.value)}
                    className={`flex items-center gap-2 ${isSelected ? "bg-muted" : ""}`}
                  >
                    <div
                      className={`border mr-2 flex h-4 w-4 items-center justify-center rounded-sm ${
                        isSelected
                          ? "bg-primary border-primary text-primary-foreground"
                          : "opacity-50 [&_svg]:invisible"
                      }`}
                    >
                      <svg className="h-4 w-4" fill="none" viewBox="0 0 24 24" stroke="currentColor" strokeWidth={2}>
                        <path strokeLinecap="round" strokeLinejoin="round" d="M5 13l4 4L19 7" />
                      </svg>
                    </div>
                    <span>{option.label}</span>
                  </CommandItem>
                )
              })}
            </CommandGroup>
          </div>
        )}
      </div>
    </Command>
  )
}