import { useState, useCallback } from 'react';

export const useBrowserState = () => {
  const [historyStack, setHistoryStack] = useState<string[]>([]);
  const [currentIndex, setCurrentIndex] = useState(-1);
  const [bookmarks, setBookmarks] = useState<string[]>([]);
  const [summary, setSummary] = useState('');
  const [isSummaryVisible, setIsSummaryVisible] = useState(false);

  const loadUrl = useCallback(async (url: string, pushToHistory = true) => {
    try {
      console.log('Loading URL:', url);
      
      if (pushToHistory) {
        setHistoryStack(prev => {
          const newStack = prev.slice(0, currentIndex + 1);
          newStack.push(url);
          return newStack;
        });
        setCurrentIndex(prev => prev + 1);
      }

      return url;
    } catch (error) {
      console.error('Error loading URL:', error);
      throw error;
    }
  }, [currentIndex]);

  const goBack = useCallback(() => {
    if (currentIndex > 0) {
      const newIndex = currentIndex - 1;
      setCurrentIndex(newIndex);
      return historyStack[newIndex];
    }
    return null;
  }, [currentIndex, historyStack]);

  const goForward = useCallback(() => {
    if (currentIndex < historyStack.length - 1) {
      const newIndex = currentIndex + 1;
      setCurrentIndex(newIndex);
      return historyStack[newIndex];
    }
    return null;
  }, [currentIndex, historyStack]);

  const addBookmark = useCallback(() => {
    if (currentIndex >= 0) {
      const currentUrl = historyStack[currentIndex];
      if (currentUrl && !bookmarks.includes(currentUrl)) {
        setBookmarks(prev => [...prev, currentUrl]);
        console.log('Bookmark added:', currentUrl);
      }
    }
  }, [currentIndex, historyStack, bookmarks]);

  const setSummaryAndShow = useCallback((summaryText: string) => {
    setSummary(summaryText);
    setIsSummaryVisible(true);
  }, []);

  const hideSummary = useCallback(() => {
    setIsSummaryVisible(false);
  }, []);

  return {
    historyStack,
    currentIndex,
    bookmarks,
    summary,
    isSummaryVisible,
    canGoBack: currentIndex > 0,
    canGoForward: currentIndex < historyStack.length - 1,
    loadUrl,
    goBack,
    goForward,
    addBookmark,
    setSummaryAndShow,
    hideSummary
  };
};