"use client";

import { useEffect, useCallback } from "react";
import { useAppStore, parseShortcut } from "@/store/app-store";

export interface KeyboardShortcut {
  key: string;  // Can be simple "K" or with modifiers "Shift+N", "Cmd+K"
  action: () => void;
  description?: string;
}

/**
 * Check if the currently focused element is an input, textarea, or contenteditable element
 * or if an autocomplete/typeahead dropdown is open
 */
function isInputFocused(): boolean {
  const activeElement = document.activeElement;
  if (!activeElement) return false;

  // Check if it's a form input element
  const tagName = activeElement.tagName.toLowerCase();
  if (tagName === "input" || tagName === "textarea" || tagName === "select") {
    return true;
  }

  // Check if it's a contenteditable element
  if (activeElement.getAttribute("contenteditable") === "true") {
    return true;
  }

  // Check if it has a role of textbox or searchbox
  const role = activeElement.getAttribute("role");
  if (role === "textbox" || role === "searchbox" || role === "combobox") {
    return true;
  }

  // Check if focus is inside an xterm terminal (they use a hidden textarea)
  const xtermContainer = activeElement.closest(".xterm");
  if (xtermContainer) {
    return true;
  }

  // Also check if any parent has data-terminal-container attribute
  const terminalContainer = activeElement.closest("[data-terminal-container]");
  if (terminalContainer) {
    return true;
  }

  // Check for autocomplete/typeahead dropdowns being open
  const autocompleteList = document.querySelector(
    '[data-testid="category-autocomplete-list"]'
  );
  if (autocompleteList) {
    return true;
  }

  // Check for any open dialogs
  const dialog = document.querySelector('[role="dialog"][data-state="open"]');
  if (dialog) {
    return true;
  }

  // Check for project picker dropdown being open
  const projectPickerDropdown = document.querySelector(
    '[data-testid="project-picker-dropdown"]'
  );
  if (projectPickerDropdown) {
    return true;
  }

  // Check for any open dropdown menus (Radix UI uses role="menu")
  // This prevents shortcuts from firing when user is typing in dropdown filters
  const dropdownMenu = document.querySelector('[role="menu"]');
  if (dropdownMenu) {
    return true;
  }

  return false;
}

/**
 * Check if a keyboard event matches a shortcut definition
 */
function matchesShortcut(event: KeyboardEvent, shortcutStr: string): boolean {
  const shortcut = parseShortcut(shortcutStr);

  // Check if the key matches (case-insensitive)
  if (event.key.toLowerCase() !== shortcut.key.toLowerCase()) {
    return false;
  }

  // Check modifier keys
  const cmdCtrlPressed = event.metaKey || event.ctrlKey;
  const shiftPressed = event.shiftKey;
  const altPressed = event.altKey;

  // If shortcut requires cmdCtrl, it must be pressed
  if (shortcut.cmdCtrl && !cmdCtrlPressed) return false;
  // If shortcut doesn't require cmdCtrl, it shouldn't be pressed
  if (!shortcut.cmdCtrl && cmdCtrlPressed) return false;

  // If shortcut requires shift, it must be pressed
  if (shortcut.shift && !shiftPressed) return false;
  // If shortcut doesn't require shift, it shouldn't be pressed
  if (!shortcut.shift && shiftPressed) return false;

  // If shortcut requires alt, it must be pressed
  if (shortcut.alt && !altPressed) return false;
  // If shortcut doesn't require alt, it shouldn't be pressed
  if (!shortcut.alt && altPressed) return false;

  return true;
}

/**
 * Hook to manage keyboard shortcuts
 * Shortcuts won't fire when user is typing in inputs, textareas, or when dialogs are open
 * Supports modifier keys: Shift, Cmd/Ctrl, Alt/Option
 */
export function useKeyboardShortcuts(shortcuts: KeyboardShortcut[]) {
  const handleKeyDown = useCallback(
    (event: KeyboardEvent) => {
      // Don't trigger shortcuts when typing in inputs
      if (isInputFocused()) {
        return;
      }

      // Find matching shortcut
      const matchingShortcut = shortcuts.find(
        (shortcut) => matchesShortcut(event, shortcut.key)
      );

      if (matchingShortcut) {
        event.preventDefault();
        matchingShortcut.action();
      }
    },
    [shortcuts]
  );

  useEffect(() => {
    window.addEventListener("keydown", handleKeyDown);
    return () => {
      window.removeEventListener("keydown", handleKeyDown);
    };
  }, [handleKeyDown]);
}

/**
 * Hook to get current keyboard shortcuts from store
 * This replaces the static constants and allows customization
 */
export function useKeyboardShortcutsConfig() {
  const keyboardShortcuts = useAppStore((state) => state.keyboardShortcuts);
  return keyboardShortcuts;
}