import React, { useState, useRef, useEffect, useMemo } from "react";
import { Stack, Button, Text } from "@mantine/core";
import { useTranslation } from "react-i18next";
import LocalIcon from '../../shared/LocalIcon';
import { ToolRegistryEntry } from "../../../data/toolsTaxonomy";
import { TextInput } from "../../shared/TextInput";
import "./ToolPicker.css";

interface ToolSearchProps {
  value: string;
  onChange: (value: string) => void;
  toolRegistry: Readonly<Record<string, ToolRegistryEntry>>;
  onToolSelect?: (toolId: string) => void;
  mode: "filter" | "dropdown" | "unstyled";
  selectedToolKey?: string | null;
  placeholder?: string;
  hideIcon?: boolean;
  onFocus?: () => void;
  autoFocus?: boolean;
}

const ToolSearch = ({
  value,
  onChange,
  toolRegistry,
  onToolSelect,
  mode = "filter",
  selectedToolKey,
  placeholder,
  hideIcon = false,
  onFocus,
  autoFocus = false,
}: ToolSearchProps) => {
  const { t } = useTranslation();
  const [dropdownOpen, setDropdownOpen] = useState(false);
  const searchRef = useRef<HTMLInputElement>(null);
  const dropdownRef = useRef<HTMLDivElement>(null);

  const filteredTools = useMemo(() => {
    if (!value.trim()) return [];
    return Object.entries(toolRegistry)
      .filter(([id, tool]) => {
        if (mode === "dropdown" && id === selectedToolKey) return false;
        return (
          tool.name.toLowerCase().includes(value.toLowerCase()) || tool.description.toLowerCase().includes(value.toLowerCase())
        );
      })
      .slice(0, 6)
      .map(([id, tool]) => ({ id, tool }));
  }, [value, toolRegistry, mode, selectedToolKey]);

  const handleSearchChange = (searchValue: string) => {
    onChange(searchValue);
    if (mode === "dropdown") {
      setDropdownOpen(searchValue.trim().length > 0 && filteredTools.length > 0);
    }
  };

  useEffect(() => {
    const handleClickOutside = (event: MouseEvent) => {
      if (
        searchRef.current &&
        dropdownRef.current &&
        !searchRef.current.contains(event.target as Node) &&
        !dropdownRef.current.contains(event.target as Node)
      ) {
        setDropdownOpen(false);
      }
    };
    document.addEventListener("mousedown", handleClickOutside);
    return () => document.removeEventListener("mousedown", handleClickOutside);
  }, []);

  // Auto-focus the input when requested
  useEffect(() => {
    if (autoFocus && searchRef.current) {
      setTimeout(() => {
        searchRef.current?.focus();
      }, 10);
    }
  }, [autoFocus]);

  const searchInput = (
      <TextInput
        ref={searchRef}
        value={value}
        onChange={handleSearchChange}
        placeholder={placeholder || t("toolPicker.searchPlaceholder", "Search tools...")}
        icon={hideIcon ? undefined : <LocalIcon icon="search-rounded" width="1.5rem" height="1.5rem" />}
        autoComplete="off"
        onFocus={onFocus}
      />
  );

  if (mode === "filter") {
    return <div className="search-input-container">{searchInput}</div>;
  }

  if (mode === "unstyled") {
    return searchInput;
  }

  return (
    <div ref={searchRef} style={{ position: "relative" }}>
      {searchInput}
      {dropdownOpen && filteredTools.length > 0 && (
        <div
          ref={dropdownRef}
          style={{
            position: "absolute",
            top: "100%",
            left: 0,
            right: 0,
            zIndex: 1000,
            backgroundColor: "var(--mantine-color-body)",
            border: "1px solid var(--mantine-color-gray-3)",
            borderRadius: "6px",
            boxShadow: "0 4px 6px rgba(0, 0, 0, 0.1)",
            maxHeight: "300px",
            overflowY: "auto",
          }}
        >
          <Stack gap="xs" style={{ padding: "8px" }}>
            {filteredTools.map(({ id, tool }) => (
              <Button
                key={id}
                variant="subtle"
                onClick={() => {
                  onToolSelect && onToolSelect(id);
                  setDropdownOpen(false);
                }}
                leftSection={<div style={{ color: "var(--tools-text-and-icon-color)" }}>{tool.icon}</div>}
                fullWidth
                justify="flex-start"
                style={{
                  borderRadius: "6px",
                  color: "var(--tools-text-and-icon-color)",
                  padding: "8px 12px",
                }}
              >
                <div style={{ textAlign: "left" }}>
                  <div style={{ fontWeight: 500 }}>{tool.name}</div>
                  <Text size="xs" c="dimmed" style={{ marginTop: "2px" }}>
                    {tool.description}
                  </Text>
                </div>
              </Button>
            ))}
          </Stack>
        </div>
      )}
    </div>
  );
};

export default ToolSearch;
