/**
 * useBootEffects.ts — S-BE1: Tutti gli effetti di bootstrap dell'app
 *
 * Estratto da MainWorkspace.tsx (S-BE1):
 *   - hydrateKnowledgeFromCloud (cloud context)
 *   - prewarmProviders (TCP/TLS pre-connect S316)
 *   - autoRecoverTasks (S696 task recovery)
 *   - agentLoop chunk preload (S439 requestIdleCallback)
 *   - agent:stream-chunk SSE listener (S422)
 *   - useStorageAutoPrune / useSafariLifecycle / useSafariMemory
 *   - selfDiag (autodiagnosi critica)
 *   - VFS → previewHtml + setTab("preview")
 *   - agente:preview_open event listener
 *   - sessionStorage cleanup on unload
 *   - ghListCommits fire-and-forget
 *
 * Nessun parametro, nessun valore di ritorno — puri side-effects.
 * Usa getState() per setPreviewHtml/setActiveTab → zero stale-closure deps.
 */

import { useEffect }                     from "react";
import { useStorageAutoPrune }           from "@/hooks/useStorageQuota";
import { useSafariLifecycle }            from "@/hooks/useSafariLifecycle";
import { useSafariMemory }               from "@/hooks/useSafariMemory";
import { hydrateKnowledgeFromCloud }     from "@/lib/contextBridge";
import { prewarmProviders }              from "@/lib/providerChain";
import { ghListCommits, getRepoConfig }  from "@/lib/github";
import { vfsAsync, onVfsChanged }        from "@/lib/vfsDb";
import { selfDiag }                      from "@/lib/selfDiag";
import { type Message }                  from "@/lib/storage";
import { useConversationStore }          from "@/store/conversationStore";
import { useWorkspaceStore }             from "@/store/workspaceStore";
import { useUIStore }                    from "@/store/uiStore";
import { useChatStore }                  from "@/store/chatStore";

// ── agentLoop lazy cache (modulo-level, condiviso con gli effetti del hook) ──
let _agentLoopPromise: Promise<typeof import("@/lib/agentLoop")> | null = null;
const _loadAgentLoop = (): Promise<typeof import("@/lib/agentLoop")> =>
  (_agentLoopPromise ??= import("@/lib/agentLoop"));

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

export function useBootEffects(): void {

  // ── Cloud context hydration ───────────────────────────────────────────────
  useEffect(() => { hydrateKnowledgeFromCloud(); }, []);

  // ── S316: prewarm TCP/TLS verso Groq — riduce cold-start ~300ms su mobile/Safari
  useEffect(() => { prewarmProviders(); }, []);

  // ── S696: auto-recovery — drena task interrotti < 10min fa (max 3 task) ──
  useEffect(() => {
    import("@/lib/taskRecovery").then(m => m.autoRecoverTasks()).catch(() => {});
  }, []); // eslint-disable-line react-hooks/exhaustive-deps

  // ── S439: preload agentLoop chunk via requestIdleCallback ─────────────────
  // Garantisce chunk in memoria prima del primo invio messaggio.
  // Fallback setTimeout 2s se rIC non supportato.
  useEffect(() => {
    const load = () => { _loadAgentLoop().catch(() => {}); };
    if (typeof requestIdleCallback !== "undefined") {
      const id = requestIdleCallback(load, { timeout: 3_000 });
      return () => cancelIdleCallback(id);
    }
    const t = setTimeout(load, 2_000);
    return () => clearTimeout(t);
  }, []);

  // ── S422: SSE token listener → chatStore (live stream senza re-render completo)
  useEffect(() => {
    const handler = (e: Event) => {
      const ev = e as CustomEvent<{ taskId: string; token: string }>;
      useChatStore.getState().appendStreamChunk(ev.detail.taskId, ev.detail.token);
    };
    window.addEventListener("agent:stream-chunk", handler);
    return () => window.removeEventListener("agent:stream-chunk", handler);
  }, []);

  // ── Storage / Safari lifecycle hooks ─────────────────────────────────────
  useStorageAutoPrune();
  useSafariLifecycle();
  useSafariMemory();

  // ── selfDiag — inietta messaggio critico in conversazione attiva ──────────
  useEffect(() => {
    selfDiag.start();
    return selfDiag.onCritical(report => {
      const sysMsg: Message = {
        id: crypto.randomUUID(), role: "assistant",
        content: `🔍 **Autodiagnosi:** ${report}`,
        createdAt: Date.now(),
      };
      useConversationStore.getState().setMessages(prev => [...prev, sysMsg]);
    });
  // eslint-disable-next-line react-hooks/exhaustive-deps
  }, []);

  // ── VFS → previewHtml: apre tab preview quando VFS produce un .html ───────
  // Usa getState() — i setter Zustand sono stabili, zero stale-closure deps.
  useEffect(() => {
    const check = () => {
      vfsAsync.list()
        .then(files => {
          const html = files
            .filter(f => f.name.endsWith(".html") || f.path.endsWith(".html"))
            .sort((a, b) => b.updatedAt - a.updatedAt)[0];
          if (html?.content) {
            useWorkspaceStore.getState().setPreviewHtml({ content: html.content, name: html.name });
            useUIStore.getState().setActiveTab("preview");
          }
        })
        .catch(() => {});
    };
    return onVfsChanged(check);
  }, []);

  // ── agente:preview_open — preview HTML inline da tool output ─────────────
  useEffect(() => {
    const handler = (e: Event) => {
      const detail = (e as CustomEvent<{ path?: string; html?: string; name?: string }>).detail;
      if (detail?.html) {
        const fname = detail.name ?? detail.path?.split("/").pop() ?? "preview.html";
        useWorkspaceStore.getState().setPreviewHtml({ content: detail.html, name: fname });
        useUIStore.getState().setActiveTab("preview");
      }
    };
    window.addEventListener("agente:preview_open", handler);
    return () => window.removeEventListener("agente:preview_open", handler);
  }, []);

  // ── sessionStorage cleanup on unload ─────────────────────────────────────
  useEffect(() => {
    const cleanup = () => { try { sessionStorage.removeItem("agente_active_id"); } catch { /**/ } };
    window.addEventListener("beforeunload", cleanup);
    return () => window.removeEventListener("beforeunload", cleanup);
  }, []);

  // ── GH recent commit (fire-and-forget) ───────────────────────────────────
  useEffect(() => {
    const { owner, repo } = getRepoConfig();
    ghListCommits(owner, repo, 1).catch(() => {});
  }, []);
}