/**
 * useWorkspacePanel.ts — S-WP1: Pannelli UI, tastiera, responsive, badge
 *
 * Estratto da MainWorkspace.tsx (S-WP1):
 *   - Tutti i subscriber UIStore (tab, sidebar, panel toggles, hasToken, badges…)
 *   - tabsVisited (lazy-mount tracking)
 *   - Effetto responsive (isMobile resize listener)
 *   - Effetto keyboard shortcuts (Escape, Cmd+K, Ctrl+P, Shift+H/S/L/P/A)
 *   - Effetto visualViewport (--vvh + scroll-jump prevention)
 *   - Effetto memory badge pulse
 *   - Effetto refresh badge counts when panels close
 *   - Boot effect: hasToken
 *
 * Rimane in MainWorkspace: ConversationStore, WorkspaceStore, boot side-effects
 * (prewarm, hydrate, agentLoop, GH, SSE), selfDiag, VFS, JSX.
 */

import { useState, useRef, useEffect }   from "react";
import { useIsLandscape }                from "@/hooks/use-mobile";
import { useUIStore, selectAlertCount }  from "@/store/uiStore";
import { useConversationStore }          from "@/store/conversationStore";
import { useWorkspaceStore }             from "@/store/workspaceStore";
import { agentMemory }                   from "@/lib/agentMemory";
import { getConnectors }                 from "@/lib/connectors";
import { getAnyToken }                   from "@/lib/messageBuilders";
import { onTokenInvalid }               from "@/lib/providerStatusEmitter"; // TOKEN-FIX-5: 401 → reset hasToken

// ─────────────────────────────────────────────────────────────────────────────

interface UseWorkspacePanelOptions {
  /** AbortController ref from useConversationManager — Escape key aborts stream */
  abortRef: React.RefObject<AbortController | null>;
}

export function useWorkspacePanel({ abortRef }: UseWorkspacePanelOptions) {

  // ── UIStore — tab ─────────────────────────────────────────────────────────
  const tab             = useUIStore(s => s.activeTab);
  const setTab          = useUIStore(s => s.setActiveTab);

  // ── Lazy mount: tab visitati — FileEditor e TerminalPanel montati solo dopo primo accesso
  const [tabsVisited, setTabsVisited] = useState<Set<string>>(new Set(["chat"]));

  useEffect(() => {
    setTabsVisited(prev => { const s = new Set([...prev]); s.add(tab); return s; });
  }, [tab]);

  // ── UIStore — sidebar + settings ─────────────────────────────────────────
  const sidebarOpen     = useUIStore(s => s.sidebarOpen);
  const setSidebarOpen  = useUIStore(s => s.setSidebarOpen);
  const toggleSidebar   = useUIStore(s => s.toggleSidebar);
  const showSettings    = useUIStore(s => s.showSettings);
  const setShowSettings = useUIStore(s => s.setShowSettings);

  // ── UIStore — panel toggles ───────────────────────────────────────────────
  const toggleTaskHistory    = useUIStore(s => s.toggleTaskHistory);
  const toggleSnapshotPanel  = useUIStore(s => s.toggleSnapshotPanel);
  const toggleRuntimeConsole = useUIStore(s => s.toggleRuntimeConsole);
  const togglePythonVars     = useUIStore(s => s.togglePythonVars);
  const showConnectors       = useUIStore(s => s.showConnectors);
  const showMemory           = useUIStore(s => s.showMemory);
  const toggleAdminTasks     = useUIStore(s => s.toggleAdminTasks);   // S370
  const toggleQuickOpen      = useUIStore(s => s.toggleQuickOpen);    // S617

  // ── UIStore — layout ──────────────────────────────────────────────────────
  const workspaceMode  = useUIStore(s => s.workspaceMode);
  const chatPanelOpen  = useUIStore(s => s.chatPanelOpen);
  const isMobile       = useUIStore(s => s.isMobile);
  const isLandscape    = useIsLandscape();  // S464: landscape mobile layout

  // ── UIStore — auth + badges ───────────────────────────────────────────────
  const hasToken          = useUIStore(s => s.hasToken);
  const setHasToken       = useUIStore(s => s.setHasToken);
  const setMemPulse       = useUIStore(s => s.setMemPulse);
  const setMemoryCount    = useUIStore(s => s.setMemoryCount);
  const setConnectorCount = useUIStore(s => s.setConnectorCount);
  const systemAlerts      = useUIStore(s => s.systemAlerts);
  const alertCount        = useUIStore(selectAlertCount);
  const addAlert          = useUIStore(s => s.addAlert);

  // ── Internal ref: memory badge count tracking ─────────────────────────────
  const prevMemCountRef = useRef<number>(agentMemory.list().length);

  // ── Boot: hasToken ────────────────────────────────────────────────────────
  useEffect(() => { setHasToken(!!getAnyToken()); }, [setHasToken]);

  // ── TOKEN-FIX-5: 401 token-invalid → reset hasToken → TokenSetup schermata ──
  // emitTokenInvalid() è chiamato da providerFallbackChain/providerTryCore/agentLoop
  // quando un provider risponde 401 (token scaduto o non valido). Prima non aveva
  // subscriber → 401 silenzioso, utente vedeva solo "Tutti i provider non hanno risposto"
  // senza capire il motivo. Ora resetta hasToken → mostra TokenSetup per aggiornare.
  useEffect(() => onTokenInvalid(() => {
    setHasToken(false);
  }), [setHasToken]);

  // ── Keyboard shortcuts ────────────────────────────────────────────────────
  useEffect(() => {
    const h = (e: KeyboardEvent) => {
      // Escape: ferma streaming
      if (e.key === "Escape") {
        if (abortRef.current) { e.preventDefault(); abortRef.current.abort(); }
        return;
      }
      // Cmd+K (Mac) / Ctrl+K (Win/Linux): nuova conversazione / Command Palette
      if (e.key === "k" && (e.metaKey || e.ctrlKey)) {
        e.preventDefault();
        useConversationStore.getState().newConv();
        return;
      }
      // S626: Ctrl+Shift+T / Cmd+Shift+T — riapri ultimo tab chiuso (VS Code standard)
      if (e.key === "t" && (e.metaKey || e.ctrlKey) && e.shiftKey) {
        e.preventDefault();
        useWorkspaceStore.getState().reopenLastClosed();
        return;
      }
      // S617/S650: Ctrl+P / Cmd+P — Quick Open palette
      if (e.key === "p" && (e.metaKey || e.ctrlKey) && !e.shiftKey) {
        e.preventDefault();
        toggleQuickOpen();
        return;
      }
      if (!e.shiftKey) return;
      const tag = (e.target as HTMLElement)?.tagName;
      if (tag === "INPUT" || tag === "TEXTAREA" || tag === "SELECT" || (e.target as HTMLElement)?.isContentEditable) return;
      if (e.key === "H") { e.preventDefault(); toggleTaskHistory(); }
      if (e.key === "S") { e.preventDefault(); toggleSnapshotPanel(); }
      if (e.key === "L") { e.preventDefault(); toggleRuntimeConsole(); }
      if (e.key === "P") { e.preventDefault(); togglePythonVars(); }
      if (e.key === "A") { e.preventDefault(); toggleAdminTasks(); }  // S370
    };
    window.addEventListener("keydown", h);
    return () => window.removeEventListener("keydown", h);
  }, [abortRef, toggleTaskHistory, toggleSnapshotPanel, toggleRuntimeConsole, togglePythonVars, toggleAdminTasks, toggleQuickOpen]);

  // ── visualViewport: --vvh + blocca scroll-jump ────────────────────────────
  useEffect(() => {
    const vv = (window as Window & { visualViewport?: VisualViewport }).visualViewport;
    if (!vv) return;
    const onWinScroll = () => { if (window.scrollY !== 0) window.scrollTo(0, 0); };
    window.addEventListener("scroll", onWinScroll, { passive: true });
    return () => {
      window.removeEventListener("scroll", onWinScroll);
    };
  }, []);

  // ── Memory badge pulse ────────────────────────────────────────────────────
  useEffect(() => {
    const unsub = agentMemory.subscribe(() => {
      const newCount = agentMemory.list().length;
      if (newCount > prevMemCountRef.current) setMemPulse(true);
      prevMemCountRef.current = newCount;
    });
    return unsub;
  }, [setMemPulse]);

  // ── Refresh badge counts when panels close ────────────────────────────────
  useEffect(() => {
    if (!showMemory)     setMemoryCount(agentMemory.list().length);
    if (!showConnectors) setConnectorCount(getConnectors().length);
  }, [showMemory, showConnectors, setMemoryCount, setConnectorCount]);

  return {
    tab, setTab, tabsVisited,
    sidebarOpen, setSidebarOpen, toggleSidebar,
    showSettings, setShowSettings,
    toggleTaskHistory, toggleSnapshotPanel, toggleRuntimeConsole,
    togglePythonVars, toggleAdminTasks, toggleQuickOpen,
    showConnectors, showMemory,
    workspaceMode, chatPanelOpen,
    isMobile, isLandscape,
    hasToken, setHasToken,
    systemAlerts, alertCount, addAlert,
    setMemPulse, setMemoryCount, setConnectorCount,
  };
}