"use client";

import { useQuery } from "@tanstack/react-query";
import { useEffect, useRef, useState } from "react";
import { get } from "../../lib/api";

interface Directory {
  name: string;
  path: string;
}

interface PathAutocompleteProps {
  value: string;
  onChange: (value: string) => void;
  placeholder?: string;
  className?: string;
  defaultPath?: string;
}

export default function PathAutocomplete({
  value,
  onChange,
  placeholder = "/path/to/destination",
  className = "",
  defaultPath = "",
}: PathAutocompleteProps) {
  const [showSuggestions, setShowSuggestions] = useState(false);
  const [selectedIndex, setSelectedIndex] = useState(-1);
  const inputRef = useRef<HTMLInputElement>(null);
  const suggestionsRef = useRef<HTMLDivElement>(null);

  // Get the parent directory to search for subdirectories
  const searchPath = value || defaultPath;
  const parentPath = searchPath.endsWith("/")
    ? searchPath.slice(0, -1)
    : searchPath;

  // Fetch directories for autocomplete
  const { data: dirData } = useQuery<{ directories: Directory[] }>({
    queryKey: ["directories", parentPath],
    queryFn: async () => {
      if (!parentPath) return { directories: [] };
      return get("/directories", { path: parentPath });
    },
    enabled: !!parentPath && showSuggestions,
    staleTime: 30000, // Cache for 30 seconds
  });

  const directories = dirData?.directories || [];

  // Close suggestions when clicking outside
  useEffect(() => {
    const handleClickOutside = (event: MouseEvent) => {
      if (
        suggestionsRef.current &&
        !suggestionsRef.current.contains(event.target as Node) &&
        !inputRef.current?.contains(event.target as Node)
      ) {
        setShowSuggestions(false);
      }
    };

    document.addEventListener("mousedown", handleClickOutside);
    return () => document.removeEventListener("mousedown", handleClickOutside);
  }, []);

  const handleInputChange = (e: React.ChangeEvent<HTMLInputElement>) => {
    const newValue = e.target.value;
    onChange(newValue);
    setShowSuggestions(true);
    setSelectedIndex(-1);
  };

  const handleSuggestionClick = (dirPath: string) => {
    onChange(dirPath);
    setShowSuggestions(false);
    setSelectedIndex(-1);
  };

  const handleKeyDown = (e: React.KeyboardEvent<HTMLInputElement>) => {
    if (!showSuggestions || directories.length === 0) {
      if (e.key === "ArrowDown") {
        e.preventDefault();
        setShowSuggestions(true);
      }
      return;
    }

    switch (e.key) {
      case "ArrowDown":
        e.preventDefault();
        setSelectedIndex((prev) =>
          prev < directories.length - 1 ? prev + 1 : prev
        );
        break;
      case "ArrowUp":
        e.preventDefault();
        setSelectedIndex((prev) => (prev > 0 ? prev - 1 : -1));
        break;
      case "Enter":
        e.preventDefault();
        if (selectedIndex >= 0 && selectedIndex < directories.length) {
          handleSuggestionClick(directories[selectedIndex].path);
        }
        break;
      case "Escape":
        setShowSuggestions(false);
        setSelectedIndex(-1);
        break;
    }
  };

  const handleFocus = () => {
    if (directories.length > 0) {
      setShowSuggestions(true);
    }
  };

  return (
    <div className="relative">
      <input
        ref={inputRef}
        type="text"
        value={value}
        onChange={handleInputChange}
        onKeyDown={handleKeyDown}
        onFocus={handleFocus}
        placeholder={placeholder}
        className={className}
      />

      {showSuggestions && directories.length > 0 && (
        <div
          ref={suggestionsRef}
          className="absolute z-10 w-full mt-1 bg-white dark:bg-gray-800 border border-gray-300 dark:border-gray-600 rounded-md shadow-lg max-h-60 overflow-y-auto"
        >
          {directories.map((dir, index) => (
            <button
              key={dir.path}
              type="button"
              onClick={() => handleSuggestionClick(dir.path)}
              className={`w-full text-left px-3 py-2 text-sm hover:bg-gray-100 dark:hover:bg-gray-700 focus:outline-none focus:bg-gray-100 dark:focus:bg-gray-700 ${
                index === selectedIndex ? "bg-blue-50 dark:bg-blue-900/20" : ""
              }`}
            >
              <div className="flex items-center">
                <svg
                  className="h-4 w-4 mr-2 text-gray-400"
                  fill="none"
                  viewBox="0 0 24 24"
                  stroke="currentColor"
                >
                  <path
                    strokeLinecap="round"
                    strokeLinejoin="round"
                    strokeWidth={2}
                    d="M3 7v10a2 2 0 002 2h14a2 2 0 002-2V9a2 2 0 00-2-2h-6l-2-2H5a2 2 0 00-2 2z"
                  />
                </svg>
                <span className="text-gray-900 dark:text-gray-100">
                  {dir.name}
                </span>
              </div>
              <div className="text-xs text-gray-500 dark:text-gray-400 ml-6 truncate">
                {dir.path}
              </div>
            </button>
          ))}
        </div>
      )}

      {defaultPath && value !== defaultPath && (
        <p className="mt-1 text-xs text-gray-500 dark:text-gray-400">
          Default: {defaultPath}
        </p>
      )}
    </div>
  );
}