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,
  CommandList,
} from "@/components/ui/command";
import {
  Popover,
  PopoverContent,
  PopoverTrigger,
} from "@/components/ui/popover";

export interface ComboboxOption {
  label: string;
  value: string;
}

interface ComboboxProps {
  options: ComboboxOption[];
  value?: string;
  onValueChange?: (value: string) => void;
  placeholder?: string;
  searchPlaceholder?: string;
  emptyText?: string;
  disabled?: boolean;
  className?: string;
  loading?: boolean;
}

export function Combobox({
  options,
  value,
  onValueChange,
  placeholder = "Select option...",
  searchPlaceholder = "Search...",
  emptyText = "No options found.",
  disabled = false,
  className,
  loading = false,
}: ComboboxProps) {
  const [open, setOpen] = React.useState(false);

  const selectedOption = options.find((option) => option.value === value);

  return (
    <Popover open={open} onOpenChange={setOpen}>
      <PopoverTrigger asChild>
        <Button
          variant="outline"
          role="combobox"
          aria-expanded={open}
          className={cn("w-full justify-between text-left", className)}
          disabled={disabled}
        >
          <span className="truncate">
            {selectedOption ? selectedOption.label : placeholder}
          </span>
          <ChevronsUpDown className="ml-2 h-4 w-4 shrink-0 opacity-50" />
        </Button>
      </PopoverTrigger>
      <PopoverContent className="w-full p-0" align="start">
        <Command>
          <CommandInput placeholder={searchPlaceholder} />
          <CommandList>
            <CommandEmpty>{loading ? "Loading..." : emptyText}</CommandEmpty>
            <CommandGroup>
              {options.map((option) => (
                <CommandItem
                  key={option.value}
                  value={option.value}
                  onSelect={(currentValue) => {
                    const newValue = currentValue === value ? "" : currentValue;
                    onValueChange?.(newValue);
                    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>
  );
}