import * as React from "react";
import { Check, ChevronsUpDown, Search } from "lucide-react";
import { cn } from "@/components/ui/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";
import { getAllHsnSacCodes, HsnSacCode } from "@/services/hsnSacCodeApi";

interface HsnSacSelectorProps {
  value: string;
  onChange: (value: string) => void;
  type: "HSN" | "SAC";
  placeholder?: string;
  disabled?: boolean;
  className?: string;
}

export function HsnSacSelector({
  value,
  onChange,
  type,
  placeholder,
  disabled,
  className,
}: HsnSacSelectorProps) {
  const [open, setOpen] = React.useState(false);
  const [allCodes, setAllCodes] = React.useState<HsnSacCode[]>([]);

  React.useEffect(() => {
    const fetchCodes = async () => {
      try {
        const response = await getAllHsnSacCodes(true, 1, 1000); 
        setAllCodes(response.codes);
      } catch (error) {
        console.error("Failed to fetch HSN/SAC codes for selector:", error);
      }
    };

    if (open && allCodes.length === 0) {
      fetchCodes();
    }
  }, [open, allCodes.length]);

  const filteredCodes = React.useMemo(() => {
    return allCodes.filter((c) => c.type === type);
  }, [allCodes, type]);

  return (
    <Popover open={open} onOpenChange={setOpen}>
      <PopoverTrigger asChild>
        <Button
          variant="outline"
          role="combobox"
          aria-expanded={open}
          disabled={disabled}
          className={cn("w-full justify-between bg-white font-normal h-9 px-3 text-xs sm:text-sm border-slate-200 hover:bg-slate-50", className)}
        >
          <span className="font-medium text-slate-900">
            {value
              ? allCodes.find((code) => code.code === value)?.code || value
              : placeholder || `Select ${type}...`}
          </span>
          <ChevronsUpDown className="ml-2 h-4 w-4 shrink-0 opacity-50" />
        </Button>
      </PopoverTrigger>
      <PopoverContent className="w-[320px] p-0 shadow-2xl border-slate-200" align="start">
        <Command className="rounded-lg border-0">
          <div className="bg-slate-50/80 p-2.5 flex items-center gap-2">
            <Search className="w-4 h-4 text-slate-400" />
            <CommandInput 
              placeholder={`Search ${type} code...`} 
              wrapperClassName="border-none p-0 h-auto flex-1"
              className="h-8 border-none bg-transparent shadow-none ring-0 focus-visible:ring-0 placeholder:text-slate-400 text-sm"
            />
          </div>
          <CommandList className="max-h-[350px] scrollbar-thin scrollbar-thumb-slate-200">
            <CommandEmpty className="py-8 text-center">
              <div className="flex flex-col items-center gap-2">
                <Search className="h-8 w-8 text-slate-200" />
                <p className="text-sm font-medium text-slate-500">No {type} code found</p>
                <p className="text-xs text-slate-400">Try a different search term</p>
              </div>
            </CommandEmpty>
            <CommandGroup className="p-1.5">
              {filteredCodes.map((code) => (
                <CommandItem
                  key={code.id}
                  value={code.code}
                  onSelect={(currentValue) => {
                    onChange(currentValue);
                    setOpen(false);
                  }}
                  className="flex flex-col items-start gap-1 p-2.5 rounded-md aria-selected:bg-slate-100 transition-colors cursor-pointer mb-1 last:mb-0"
                >
                  <div className="flex items-center w-full justify-between">
                    <span className="font-bold text-sm text-slate-900 leading-none">{code.code}</span>
                    <div className="flex items-center gap-2">
                      <Check
                        className={cn(
                          "h-4 w-4 text-re-green transition-all",
                          value === code.code ? "opacity-100 scale-100" : "opacity-0 scale-75"
                        )}
                      />
                    </div>
                  </div>
                  {code.description && (
                    <span className="text-[11px] text-slate-500 line-clamp-2 leading-tight pr-4">
                      {code.description}
                    </span>
                  )}
                </CommandItem>
              ))}
            </CommandGroup>
          </CommandList>
        </Command>
      </PopoverContent>
    </Popover>
  );
}