"use client";

import { useEffect, useState, useCallback, useRef } from "react";
import "photoswipe/style.css";
import type { BookReaderProps } from "./types";
import { useFullscreen } from "./hooks/useFullscreen";
import { useReadingDirection } from "./hooks/useReadingDirection";
import { useDoublePageMode } from "./hooks/useDoublePageMode";
import { useImageLoader } from "./hooks/useImageLoader";
import { usePageNavigation } from "./hooks/usePageNavigation";
import { useTouchNavigation } from "./hooks/useTouchNavigation";
import { usePhotoSwipeZoom } from "./hooks/usePhotoSwipeZoom";
import { ControlButtons } from "./components/ControlButtons";
import { NavigationBar } from "./components/NavigationBar";
import { EndOfSeriesModal } from "./components/EndOfSeriesModal";
import { PageDisplay } from "./components/PageDisplay";
import { ReaderContainer } from "./components/ReaderContainer";
import { usePreferences } from "@/contexts/PreferencesContext";

export function PhotoswipeReader({ book, pages, onClose, nextBook }: BookReaderProps) {
  const { preferences } = usePreferences();
  const [showControls, setShowControls] = useState(false);
  const [showThumbnails, setShowThumbnails] = useState(false);
  const lastClickTimeRef = useRef<number>(0);
  const clickTimeoutRef = useRef<NodeJS.Timeout | null>(null);

  // Derive page URL builder from book.thumbnailUrl (provider-agnostic)
  const bookPageUrlBuilder = useCallback(
    (pageNum: number) => book.thumbnailUrl.replace("/thumbnail", `/pages/${pageNum}`),
    [book.thumbnailUrl]
  );
  const nextBookPageUrlBuilder = useCallback(
    (pageNum: number) =>
      nextBook ? nextBook.thumbnailUrl.replace("/thumbnail", `/pages/${pageNum}`) : "",
    [nextBook]
  );

  // Hooks
  const { direction, toggleDirection, isRTL } = useReadingDirection();
  const { isFullscreen, toggleFullscreen } = useFullscreen();
  const { isDoublePage, shouldShowDoublePage, toggleDoublePage } = useDoublePageMode();
  const {
    loadedImages,
    imageBlobUrls,
    prefetchImage,
    prefetchPages,
    prefetchNextBook,
    cancelAllPrefetches,
    handleForceReload,
    getPageUrl,
    prefetchCount,
    isPageLoading,
  } = useImageLoader({
    pageUrlBuilder: bookPageUrlBuilder,
    pages,
    prefetchCount: preferences.readerPrefetchCount,
    nextBook: nextBook ? { getPageUrl: nextBookPageUrlBuilder, pages: [] } : null,
  });
  const { currentPage, showEndMessage, navigateToPage, handlePreviousPage, handleNextPage } =
    usePageNavigation({
      book,
      pages,
      isDoublePage,
      shouldShowDoublePage: (page) => shouldShowDoublePage(page, pages.length),
      onClose,
      nextBook,
    });
  const { pswpRef, handleZoom } = usePhotoSwipeZoom({
    loadedImages,
    currentPage,
    getPageUrl,
  });

  // Touch navigation
  useTouchNavigation({
    onPreviousPage: handlePreviousPage,
    onNextPage: handleNextPage,
    pswpRef,
    isRTL,
  });

  // Activer le zoom dans le reader en enlevant la classe no-pinch-zoom
  // et reset le zoom lors des changements d'orientation (iOS applique un zoom automatique)
  useEffect(() => {
    document.body.classList.remove("no-pinch-zoom");

    const handleOrientationChange = () => {
      const viewport = document.querySelector('meta[name="viewport"]');
      if (viewport) {
        const original = viewport.getAttribute("content") || "";
        viewport.setAttribute("content", original + ", maximum-scale=1");
        // Restaurer après que iOS ait appliqué le nouveau layout
        requestAnimationFrame(() => {
          viewport.setAttribute("content", original);
        });
      }
    };

    window.addEventListener("orientationchange", handleOrientationChange);

    return () => {
      window.removeEventListener("orientationchange", handleOrientationChange);
      document.body.classList.add("no-pinch-zoom");
    };
  }, []);

  // Prefetch current and next pages
  useEffect(() => {
    // Determine visible pages that need to be loaded immediately
    const visiblePages: number[] = [];
    if (isDoublePage && shouldShowDoublePage(currentPage, pages.length)) {
      visiblePages.push(currentPage, currentPage + 1);
    } else {
      visiblePages.push(currentPage);
    }

    // Load visible pages first (priority) to avoid duplicate requests from <img> tags
    // These will populate imageBlobUrls so <img> tags use blob URLs instead of making HTTP requests
    const loadVisiblePages = async () => {
      await Promise.all(visiblePages.map((page) => prefetchImage(page)));
    };
    loadVisiblePages().catch(() => {
      // Silently fail - will fallback to direct HTTP requests
    });

    // Then prefetch other pages, excluding visible ones to avoid duplicates
    const concurrency = isDoublePage && shouldShowDoublePage(currentPage, pages.length) ? 2 : 4;
    prefetchPages(currentPage, prefetchCount, visiblePages, concurrency);

    // If double page mode, also prefetch additional pages for smooth double page navigation
    if (
      isDoublePage &&
      shouldShowDoublePage(currentPage, pages.length) &&
      currentPage + prefetchCount < pages.length
    ) {
      prefetchPages(currentPage + prefetchCount, 1, visiblePages, concurrency);
    }

    // If we're near the end of the book, prefetch the next book
    const pagesFromEnd = pages.length - currentPage;
    if (pagesFromEnd <= prefetchCount && nextBook) {
      prefetchNextBook(prefetchCount);
    }
  }, [
    currentPage,
    isDoublePage,
    shouldShowDoublePage,
    prefetchImage,
    prefetchPages,
    prefetchNextBook,
    prefetchCount,
    pages.length,
    nextBook,
  ]);

  // Keyboard events
  const handleCloseReader = useCallback(
    (page: number) => {
      cancelAllPrefetches();
      onClose?.(page);
    },
    [cancelAllPrefetches, onClose]
  );

  useEffect(() => {
    const handleKeyDown = (e: KeyboardEvent) => {
      if (e.key === "ArrowLeft") {
        e.preventDefault();
        if (isRTL) {
          handleNextPage();
        } else {
          handlePreviousPage();
        }
      } else if (e.key === "ArrowRight") {
        e.preventDefault();
        if (isRTL) {
          handlePreviousPage();
        } else {
          handleNextPage();
        }
      } else if (e.key === "Escape" && onClose) {
        e.preventDefault();
        handleCloseReader(currentPage);
      }
    };

    window.addEventListener("keydown", handleKeyDown);

    return () => {
      window.removeEventListener("keydown", handleKeyDown);
    };
  }, [handleNextPage, handlePreviousPage, onClose, isRTL, currentPage, handleCloseReader]);

  const handleContainerClick = useCallback(
    (e: React.MouseEvent) => {
      // Vérifier si c'est un double-clic sur une image
      const target = e.target as HTMLElement;
      const now = Date.now();
      const timeSinceLastClick = now - lastClickTimeRef.current;

      if (target.tagName === "IMG" && timeSinceLastClick < 300) {
        // Double-clic sur une image
        if (clickTimeoutRef.current) {
          clearTimeout(clickTimeoutRef.current);
          clickTimeoutRef.current = null;
        }
        e.stopPropagation();
        handleZoom();
        lastClickTimeRef.current = 0;
      } else if (target.tagName === "IMG") {
        // Premier clic sur une image - attendre pour voir si c'est un double-clic
        lastClickTimeRef.current = now;
        if (clickTimeoutRef.current) {
          clearTimeout(clickTimeoutRef.current);
        }
        clickTimeoutRef.current = setTimeout(() => {
          setShowControls((prev) => !prev);
          clickTimeoutRef.current = null;
        }, 300);
      } else {
        // Clic ailleurs - toggle les contrôles immédiatement
        setShowControls(!showControls);
        lastClickTimeRef.current = 0;
      }
    },
    [showControls, handleZoom]
  );

  return (
    <ReaderContainer onContainerClick={handleContainerClick}>
      <EndOfSeriesModal
        show={showEndMessage}
        onClose={handleCloseReader}
        currentPage={currentPage}
      />

      <ControlButtons
        showControls={showControls}
        onToggleControls={() => setShowControls(!showControls)}
        onPreviousPage={handlePreviousPage}
        onNextPage={handleNextPage}
        onPageChange={navigateToPage}
        onClose={handleCloseReader}
        currentPage={currentPage}
        totalPages={pages.length}
        isDoublePage={isDoublePage}
        onToggleDoublePage={toggleDoublePage}
        isFullscreen={isFullscreen}
        onToggleFullscreen={() => toggleFullscreen(document.body)}
        direction={direction}
        onToggleDirection={toggleDirection}
        showThumbnails={showThumbnails}
        onToggleThumbnails={() => setShowThumbnails(!showThumbnails)}
        onZoom={handleZoom}
        onForceReload={() =>
          handleForceReload(currentPage, isDoublePage, (page) =>
            shouldShowDoublePage(page, pages.length)
          )
        }
      />

      <PageDisplay
        currentPage={currentPage}
        pages={pages}
        isDoublePage={isDoublePage}
        shouldShowDoublePage={(page) => shouldShowDoublePage(page, pages.length)}
        imageBlobUrls={imageBlobUrls}
        getPageUrl={getPageUrl}
        isRTL={isRTL}
        isPageLoading={isPageLoading}
      />

      <NavigationBar
        currentPage={currentPage}
        pages={pages}
        onPageChange={navigateToPage}
        showControls={showControls}
        showThumbnails={showThumbnails}
        book={book}
      />
    </ReaderContainer>
  );
}