import React, { Suspense, useEffect, useState, useCallback } from "react";
import { useTranslation } from "react-i18next";
import TopBar from "./components/Layout/TopBar";
import PostList from "./components/Posts/PostList";
import IslandUniverse from "./components/Island/IslandUniverse";
import IslandViewer from "./components/Island/IslandViewer";
import ChatContainer from "./components/Chat/ChatContainer";
import { fetchIslandByUsername } from "./api/client";

const MapView = React.lazy(() => import("./components/Map/MapView"));

const THEME_KEY = "sociowire:theme";

export default function App() {
  const { t } = useTranslation();
  const [theme, setTheme] = useState("blue");

  // Wall state (lifted from MapView)
  const [wallPosts, setWallPosts] = useState([]);
  const [wallLoading, setWallLoading] = useState(false);
  const [wallError, setWallError] = useState("");
  const [selectedPost, setSelectedPost] = useState(null);

  // Island Universe & Island Viewer state
  const [showUniverse, setShowUniverse] = useState(false);
  const [selectedIsland, setSelectedIsland] = useState(null);

  const handlePostsState = useCallback((next) => {
    if (!next) return;
    if (Array.isArray(next.posts)) setWallPosts(next.posts);
    setWallLoading(!!next.loading);
    setWallError(next.error || "");
  }, []);

  const handlePostDeleted = useCallback((postId) => {
    setWallPosts((prev) => prev.filter((p) => (p.id ?? p._id) !== postId));
    if (selectedPost && (selectedPost.id ?? selectedPost._id) === postId) {
      setSelectedPost(null);
    }
  }, [selectedPost]);

  const handlePostUpdated = useCallback((updatedPost) => {
    if (!updatedPost) return;
    setWallPosts((prev) =>
      prev.map((p) =>
        (p.id ?? p._id) === (updatedPost.id ?? updatedPost._id)
          ? { ...p, ...updatedPost }
          : p
      )
    );
  }, []);

  // charge le thème au démarrage
  useEffect(() => {
    if (typeof window === "undefined") return;
    try {
      const saved = localStorage.getItem(THEME_KEY);
      if (saved === "dark" || saved === "blue" || saved === "light") {
        setTheme(saved);
        document.body.setAttribute("data-theme", saved);
      } else {
        setTheme("blue");
        document.body.setAttribute("data-theme", "blue");
      }
    } catch (e) {
      setTheme("blue");
      document.body.setAttribute("data-theme", "blue");
    }
  }, []);

  // applique / sauvegarde le thème
  useEffect(() => {
    if (typeof window === "undefined") return;
    try {
      document.body.setAttribute("data-theme", theme);
      localStorage.setItem(THEME_KEY, theme);
    } catch (e) {
      // ignore
    }
  }, [theme]);

  useEffect(() => {
    const onScroll = () => {
      const threshold = window.innerHeight * 0.55;
      const expanded = window.scrollY > threshold;
      document.body.classList.toggle("sw-wall-expanded", expanded);
    };
    window.addEventListener("scroll", onScroll, { passive: true });
    onScroll();
    return () => window.removeEventListener("scroll", onScroll);
  }, []);

  // Island Universe handlers
  const handleOpenUniverse = () => {
    setShowUniverse(true);
  };

  const handleCloseUniverse = () => {
    setShowUniverse(false);
  };

  const handleIslandClick = (island) => {
    setShowUniverse(false); // Close universe
    setSelectedIsland(island); // Open island viewer
  };

  const handleOpenUserIsland = async (uname) => {
    const u = (uname || "").trim();
    if (!u) return;
    try {
      const island = await fetchIslandByUsername(u);
      if (island) {
        setShowUniverse(false);
        setSelectedIsland(island);
      }
    } catch {}
  };

  return (
    <div className="app-root">
      <TopBar
        theme={theme}
        onChangeTheme={setTheme}
        onIslandsClick={handleOpenUniverse}
        onUserIsland={handleOpenUserIsland}
      />

      <div className="main-shell">
        <div className="map-shell" id="map">
          <Suspense
            fallback={
              <div className="map-page">
                <div className="map-stage map-stage--placeholder">
                  <div className="map-placeholder-content">
                    <div className="map-placeholder-title">{t('map.loadingMap')}</div>
                    <div className="map-placeholder-subtitle">{t('map.warmingUp')}</div>
                  </div>
                  <div className="map-placeholder-overlay map-placeholder-top">
                    <div className="map-placeholder-pill map-placeholder-pill--wide" />
                  </div>
                  <div className="map-placeholder-overlay map-placeholder-left">
                    <div className="map-placeholder-pill" />
                    <div className="map-placeholder-pill" />
                    <div className="map-placeholder-pill" />
                  </div>
                  <div className="map-placeholder-overlay map-placeholder-right">
                    <div className="map-placeholder-pill" />
                    <div className="map-placeholder-pill" />
                  </div>
                  <div className="map-placeholder-overlay map-placeholder-bottom">
                    <div className="map-placeholder-chip" />
                    <div className="map-placeholder-chip" />
                    <div className="map-placeholder-chip" />
                  </div>
                </div>
              </div>
            }
          >
            <MapView
              theme={theme}
              onPostsState={handlePostsState}
              selectedPost={selectedPost}
              onSelectPost={setSelectedPost}
              selectedIsland={selectedIsland}
              onSelectIsland={setSelectedIsland}
              onOpenIslands={handleOpenUniverse}
            />
          </Suspense>
        </div>

        {/* BELOW THE MAP (page scroll like Facebook) */}
        <div className="below-stage">
          <div className="below-row">
            <div className="sociowall-panel" id="wall">
              <div className="sociowall-header">SOCIOWALL</div>
              <PostList
                posts={wallPosts}
                loading={wallLoading}
                error={wallError}
                selectedPost={selectedPost}
                onSelectPost={setSelectedPost}
                onPostDeleted={handlePostDeleted}
                onPostUpdated={handlePostUpdated}
              />
            </div>
            {/* CHAT PANEL SUPPRIMÉ */}
          </div>
        </div>

        <div style={{ height: 18 }} />

        <section className="seo-section" id="islands">
          <div className="seo-card">
            <div className="seo-kicker">{t('islands.communities')}</div>
            <h2>{t('islands.exploreIslands')}</h2>
            <p>
              {t('islands.islandsDescription')}
            </p>
            <button className="seo-cta" type="button" onClick={handleOpenUniverse}>
              {t('islands.openIslands')}
            </button>
          </div>
        </section>

        {/* Chat System */}
        <ChatContainer />
      </div>

      <footer className="sw-footer">
        <div className="sw-footer-inner">
          <div className="sw-footer-brand">SOCIOWIRE</div>
          <div className="sw-footer-brand">© Sociowire v0.0008</div>
          <nav className="sw-footer-nav" aria-label="Site">
            <a href="/">{t('nav.home')}</a>
            <a href="/#map">{t('nav.liveMap')}</a>
            <a href="/#wall">{t('nav.sociowall')}</a>
            <a href="/#islands">{t('nav.islands')}</a>
            <a href="/about.html">{t('nav.about')}</a>
            <a href="/contact.html">{t('nav.contact')}</a>
            <a href="/privacy.html">{t('nav.privacy')}</a>
          </nav>
        </div>
      </footer>

      {/* Island Universe Modal */}
      {showUniverse && (
        <IslandUniverse
          onClose={handleCloseUniverse}
          onIslandClick={handleIslandClick}
        />
      )}

      {/* Island Viewer Modal */}
      {selectedIsland && (
        <IslandViewer
          island={selectedIsland}
          onClose={() => setSelectedIsland(null)}
        />
      )}
    </div>
  );
}