import React, { useEffect, useState, useCallback } from 'react';
import { useParams, useNavigate } from 'react-router-dom';
import { useReader } from '../context/ReaderContext';
import { Toolbar } from '../components/Toolbar/Toolbar.jsx';
import { FontAwesomeIcon } from '@fortawesome/react-fontawesome';
import {
  faArrowLeft,
  faList,
  faExpand,
  faCompress,
  faBookOpen,
  faScroll
} from '@fortawesome/free-solid-svg-icons';

export function ReaderPage() {
  const { chapterId } = useParams();
  const navigate = useNavigate();
  const {
    context,
    currentPage,
    pages,
    loading,
    error,
    mode,
    loadChapterContext,
    loadPage,
    loadPages,
    setCurrentPage,
    setMode
  } = useReader();

  const [currentPageData, setCurrentPageData] = useState(null);
  const [isFullscreen, setIsFullscreen] = useState(false);

  useEffect(() => {
    const initializeChapter = async () => {
      const contextLoaded = await loadChapterContext(chapterId);
      if (contextLoaded) {
        await loadPages(chapterId);
      }
    };
    initializeChapter();
  }, [chapterId, loadChapterContext, loadPages]);

  useEffect(() => {
    if (mode === 'classic' && currentPage > 0 && pages.length > 0) {
      loadPage(chapterId, currentPage).then(setCurrentPageData);
    }
  }, [chapterId, currentPage, loadPage, mode, pages.length]);

  const handleKeyDown = useCallback((e) => {
    if (mode === 'classic') {
      if (e.key === 'ArrowLeft' || e.key === 'ArrowUp') {
        if (currentPage > 1) {
          setCurrentPage(currentPage - 1);
        } else if (context?.navigation.previous) {
          navigate(`/reader/${context.navigation.previous.id}`);
        }
      } else if (e.key === 'ArrowRight' || e.key === 'ArrowDown') {
        if (currentPage < pages.length) {
          setCurrentPage(currentPage + 1);
        } else if (context?.navigation.next) {
          navigate(`/reader/${context.navigation.next.id}`);
        }
      }
    }
  }, [currentPage, context, mode, navigate, pages.length, setCurrentPage]);

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

  const toggleFullscreen = () => {
    if (!document.fullscreenElement) {
      document.documentElement.requestFullscreen();
      setIsFullscreen(true);
    } else {
      document.exitFullscreen();
      setIsFullscreen(false);
    }
  };

  const handleImageClick = (e) => {
    if (mode !== 'classic') return;

    const rect = e.target.getBoundingClientRect();
    const x = e.clientX - rect.left;
    const width = rect.width;

    if (x < width / 2) {
      // Clic sur la partie gauche
      if (currentPage > 1) {
        setCurrentPage(currentPage - 1);
      } else if (context?.navigation.previous) {
        navigate(`/reader/${context.navigation.previous.id}`);
      }
    } else {
      // Clic sur la partie droite
      if (currentPage < pages.length) {
        setCurrentPage(currentPage + 1);
      } else if (context?.navigation.next) {
        navigate(`/reader/${context.navigation.next.id}`);
      }
    }
  };

  const toolbarConfig = {
    leftSection: [
      { icon: faArrowLeft, navigateBack: true }
    ],
    rightSection: [
      { 
        icon: mode === 'classic' ? faScroll : faBookOpen, 
        onClick: () => setMode(mode === 'classic' ? 'scrolling' : 'classic'),
        label: `Mode ${mode === 'classic' ? 'défilement' : 'page par page'}`
      },
      { 
        icon: isFullscreen ? faCompress : faExpand, 
        onClick: toggleFullscreen,
        label: isFullscreen ? 'Quitter le plein écran' : 'Plein écran'
      },
      { icon: faList, onClick: () => {}, label: 'Chapitres' }
    ]
  };

  if (loading || (!currentPageData && mode === 'classic' && pages.length === 0)) {
    return (
      <div className="flex justify-center items-center h-screen bg-gray-900 text-white">
        <div className="text-center">
          <div className="animate-spin rounded-full h-12 w-12 border-t-2 border-b-2 border-white mx-auto mb-4"></div>
          <div>Chargement du chapitre...</div>
        </div>
      </div>
    );
  }

  if (error) {
    return (
      <div className="flex flex-col justify-center items-center h-screen bg-gray-900 text-white">
        <div className="text-red-500 text-xl mb-4">{error}</div>
        <button
          onClick={() => navigate(-1)}
          className="px-4 py-2 bg-gray-800 hover:bg-gray-700 rounded-lg transition-colors"
        >
          Retour
        </button>
      </div>
    );
  }

  return (
    <div className="min-h-screen bg-gray-900 text-white">
      {/* Toolbar */}
      <div className="fixed top-0 left-0 right-0 bg-gray-800 z-50">
        <div className="container mx-auto px-4">
          <div className="h-16 flex items-center justify-between">
            <Toolbar {...toolbarConfig} />
            {context && (
              <div className="text-center flex-1">
                <span className="font-medium">Chapitre {context.number}</span>
              </div>
            )}
          </div>
        </div>
      </div>

      {/* Reader content */}
      <div className="pt-16">
        {mode === 'classic' ? (
          // Mode classique
          <div className="relative max-w-5xl mx-auto">
            {currentPageData && (
              <img
                src={`data:${currentPageData.mimeType};base64,${currentPageData.base64Content}`}
                alt={`Page ${currentPageData.pageNumber}`}
                className="w-full h-auto cursor-pointer"
                onClick={handleImageClick}
              />
            )}
            <div className="fixed bottom-4 left-1/2 transform -translate-x-1/2 bg-gray-800 px-4 py-2 rounded-lg">
              Page {currentPage} of {pages.length}
            </div>
          </div>
        ) : (
          // Mode scrolling
          <div className="max-w-5xl mx-auto space-y-4 p-4">
            {pages.map((page, index) => (
              <div key={index} className="relative">
                {page.base64Content ? (
                  <img
                    src={`data:${page.mimeType};base64,${page.base64Content}`}
                    alt={`Page ${page.pageNumber}`}
                    className="w-full h-auto"
                    loading="lazy"
                  />
                ) : (
                  <div className="w-full aspect-[2/3] bg-gray-800 animate-pulse flex items-center justify-center">
                    <span className="text-gray-400">Chargement...</span>
                  </div>
                )}
              </div>
            ))}
          </div>
        )}
      </div>

      {/* Navigation buttons for classic mode */}
      {mode === 'classic' && (
        <>
          <button
            onClick={() => {
              if (currentPage > 1) {
                setCurrentPage(currentPage - 1);
              } else if (context?.navigation.previous) {
                navigate(`/reader/${context.navigation.previous.id}`);
              }
            }}
            className="fixed left-4 top-1/2 transform -translate-y-1/2 bg-gray-800 p-4 rounded-full opacity-50 hover:opacity-100 transition-opacity"
          >
            ←
          </button>
          <button
            onClick={() => {
              if (currentPage < pages.length) {
                setCurrentPage(currentPage + 1);
              } else if (context?.navigation.next) {
                navigate(`/reader/${context.navigation.next.id}`);
              }
            }}
            className="fixed right-4 top-1/2 transform -translate-y-1/2 bg-gray-800 p-4 rounded-full opacity-50 hover:opacity-100 transition-opacity"
          >
            →
          </button>
        </>
      )}
    </div>
  );
}