"use client";

import React, { useState, useMemo } from "react";
import { Check, ChevronsUpDown } from "lucide-react";
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 { cn } from "@/lib/utils";
import type { ColumnInfo } from "../pop-dashboard/utils/dataFetcher";

interface ColumnComboboxProps {
  columns: ColumnInfo[];
  value: string;
  onSelect: (columnName: string) => void;
  placeholder?: string;
}

export function ColumnCombobox({
  columns,
  value,
  onSelect,
  placeholder = "컬럼을 선택하세요",
}: ColumnComboboxProps) {
  const [open, setOpen] = useState(false);
  const [search, setSearch] = useState("");

  const filtered = useMemo(() => {
    if (!search) return columns;
    const q = search.toLowerCase();
    return columns.filter(
      (c) =>
        c.name.toLowerCase().includes(q) ||
        (c.comment && c.comment.toLowerCase().includes(q))
    );
  }, [columns, search]);

  const selectedCol = useMemo(
    () => columns.find((c) => c.name === value),
    [columns, value],
  );
  const displayValue = selectedCol
    ? selectedCol.comment
      ? `${selectedCol.name} (${selectedCol.comment})`
      : selectedCol.name
    : "";

  return (
    <Popover open={open} onOpenChange={setOpen}>
      <PopoverTrigger asChild>
        <Button
          variant="outline"
          role="combobox"
          aria-expanded={open}
          className="mt-1 h-8 w-full justify-between text-xs"
        >
          <span className="truncate">{displayValue || placeholder}</span>
          <ChevronsUpDown className="ml-2 h-3.5 w-3.5 shrink-0 opacity-50" />
        </Button>
      </PopoverTrigger>
      <PopoverContent
        className="p-0"
        style={{ width: "var(--radix-popover-trigger-width)" }}
        align="start"
      >
        <Command shouldFilter={false}>
          <CommandInput
            placeholder="컬럼명 또는 한글명 검색..."
            className="text-xs"
            value={search}
            onValueChange={setSearch}
          />
          <CommandList>
            <CommandEmpty className="py-4 text-center text-xs">
              검색 결과가 없습니다.
            </CommandEmpty>
            <CommandGroup>
              {filtered.map((col) => (
                <CommandItem
                  key={col.name}
                  value={col.name}
                  onSelect={() => {
                    onSelect(col.name);
                    setOpen(false);
                    setSearch("");
                  }}
                  className="text-xs"
                >
                  <Check
                    className={cn(
                      "mr-2 h-3.5 w-3.5",
                      value === col.name ? "opacity-100" : "opacity-0"
                    )}
                  />
                  <div className="flex flex-col">
                    <div className="flex items-center gap-2">
                      <span>{col.name}</span>
                      {col.comment && (
                        <span className="text-[11px] text-muted-foreground">
                          ({col.comment})
                        </span>
                      )}
                    </div>
                    <span className="text-[10px] text-muted-foreground">
                      {col.type}
                    </span>
                  </div>
                </CommandItem>
              ))}
            </CommandGroup>
          </CommandList>
        </Command>
      </PopoverContent>
    </Popover>
  );
}