/**
 * case1Block.ts — S503: extracted from agentLoop.ts
 *
 * Gestisce il Case 1 completo: native tool calls (Groq, OpenAI, OpenRouter).
 * Pipeline:
 *   1. Sintetizza formalGoal a iter 0 se null
 *   2. Registra gli step come "running"
 *   3. Esegue i tool in parallelo (max 4, pLimitPool)
 *   4. Processa i risultati: annotation, world model, error recovery, live debug fix
 *   5. ReasoningCore + belief state persistence
 *   6. Delega a case1TailBlock (stagnation → return, DONE → return-success, continue)
 *
 * Muta steps e loopMessages per reference.
 * Restituisce lo stato aggiornato dei campi mutabili del loop.
 *
 * @module case1Block
 */

import type { AgentStep } from "../storage";
import type { GoalContract } from "../_goalVerifier";
import { makePlanStep } from "../_goalVerifier";
import { TOOL_STATUS_LABELS, narrativeLabel } from "./toolStatusLabels"; // S766
import { _parseToolArgs, _tryLiveDebugFix } from "./toolExecutor";
import type { Suggestion } from "../agent/SmartSuggestions";
import { verifyToolResult, annotateWithProof } from "../agent/verifier";
import { updateWorldModel } from "../worldModel";
import { selfLearning } from "../selfLearning";
import { recordErrorAsync } from "../selfLearningAsync"; // S649
import { errorLog } from "../agentBrain";
import { recordAndSuggestFix, notifyToolSuccess } from "../agent/errorRecovery";
import { persistBeliefState } from "../beliefRevision";
import { EXEC_REINJECT_TOOLS } from "./toolGate";
import { buildExecReinjectMessage } from "./execLoopGate";
import { processCase1Tail } from "./case1TailBlock";
import { infraCategory } from "./stallDetector"; // P32-GE-1
import { buildErrorSignature } from "./errorSignatureBuilder"; // S700
import { selfHealingEngine } from "./selfHealingEngine"; // S700
import type { ToolCallRaw, ApiMsg } from "./networkTools";

// ─── Interfaces ────────────────────────────────────────────────────────────────

export interface Case1BlockCtx {
  toolCalls: ToolCallRaw[];
  rawText: string | null;
  iter: number;
  MAX_ITER: number;
  // Mutable state (returned updated)
  formalGoal: GoalContract | null;
  steps: AgentStep[];
  loopMessages: ApiMsg[];
  consecutiveAllFailIters: number;
  effectiveMaxIter: number;
  sessStats: { autoFixed: number; propagated: number; verifyFails: number };
  lastExecTool: string;
  lastExecOutput: string;
  lastExecResultIter: number;
  // Read-only context
  signal?: AbortSignal;
  lastUserMsg: string;
  loopTaskId: string | null;
  isCodeTask: boolean;
  // Callbacks
  onStatus: (msg: string) => void;
  onSteps: (steps: AgentStep[]) => void;
  onChunk: (chunk: string) => void;
  onSuggestions?: (s: Suggestion[]) => void;
  // Closures from outer scope
  executeToolGated: (name: string, args: Record<string, unknown>) => Promise<string>;
  emitFinalText: (text: string, signal?: AbortSignal) => void;
  writeSess: () => void;
  epistemicTag: (toolName: string) => string;
  cbIsOpen: (name: string, iter: number) => boolean;
  cbUpdate: (name: string, result: string, iter: number) => void;
  cbSkipMsg: (name: string) => string;
  stallCheck: (name: string, args: Record<string, unknown>) => number;
  confSession: { recordSignal: (s: string) => void };
  onReasoningUpdate: (u: { last_result?: string; error?: string; completed_step?: string }) => void;
}

export type Case1BlockAction = "continue" | "return" | "return-success";

export interface Case1BlockResult {
  action: Case1BlockAction;
  formalGoal: GoalContract | null;
  consecutiveAllFailIters: number;
  effectiveMaxIter: number;
  sessStats: { autoFixed: number; propagated: number; verifyFails: number };
  lastExecTool: string;
  lastExecOutput: string;
  lastExecResultIter: number;
}

// ─── Internal helpers ──────────────────────────────────────────────────────────

/** S274: pool limitato a 4 paralleli — evita saturazione banda su mobile */
async function pLimitPool<T>(tasks: (() => Promise<T>)[], limit = 4): Promise<T[]> {
  const out: T[] = new Array(tasks.length);
  let i = 0;
  async function worker() {
    while (i < tasks.length) { const idx = i++; out[idx] = await tasks[idx](); }
  }
  await Promise.all(Array.from({ length: Math.min(limit, tasks.length) }, worker));
  return out;
}

// ─── Main export ───────────────────────────────────────────────────────────────

/** Processa il Case 1 completo (native tool calls). Sempre seguito da continue o return nel caller. */
export async function processCase1Block(ctx: Case1BlockCtx): Promise<Case1BlockResult> {
  const {
    toolCalls, rawText, iter, MAX_ITER, signal, lastUserMsg, loopTaskId, isCodeTask,
    onStatus, onSteps, onChunk, onSuggestions, executeToolGated, emitFinalText, writeSess,
    epistemicTag, cbIsOpen, cbUpdate, cbSkipMsg, stallCheck, confSession, onReasoningUpdate,
  } = ctx;

  // Local mutable copies — returned at end
  let formalGoal              = ctx.formalGoal;
  const steps                 = ctx.steps;        // mutated by reference
  const loopMessages          = ctx.loopMessages; // mutated by reference
  let consecutiveAllFailIters = ctx.consecutiveAllFailIters;
  let effectiveMaxIter        = ctx.effectiveMaxIter;
  const sessStats             = { ...ctx.sessStats };
  let lastExecTool            = ctx.lastExecTool;
  let lastExecOutput          = ctx.lastExecOutput;
  let lastExecResultIter      = ctx.lastExecResultIter;

  // ── 1. Sintetizza formalGoal a iter 0 ─────────────────────────────────────
  // Step1/S104: Case 1 non produce blocchi GOAL/DONE_WHEN — sintetizza da lastUserMsg (parity con Case 2)
  if (iter === 0 && formalGoal === null) {
    formalGoal = {
      goal:       lastUserMsg.slice(0, 200),  // S610: 120→200
      doneWhen:   lastUserMsg.slice(0, 200),  // S610: 120→200
      outOfScope: "",
    };
    // S203: emetti __plan__ step per rendere il contratto visibile in UI
    try {
      const _planStep = makePlanStep(formalGoal);
      steps.unshift(_planStep);
      onSteps([...steps]);
    } catch { /* non-blocking */ }
  }
  loopMessages.push({ role: "assistant", content: rawText ?? null, tool_calls: toolCalls } as ApiMsg);

  const toolNames = toolCalls.map(tc => TOOL_STATUS_LABELS[tc.function.name] ?? tc.function.name);
  onStatus(toolNames.length > 1 ? `${toolNames.length} tool in parallelo…` : (toolNames[0] ?? "Tool…"));

  // ── 2. Registra tutti gli step come "running" ──────────────────────────────
  const newStepIndices: number[] = [];
  for (const tc of toolCalls) {
    const _parsed0 = _parseToolArgs(tc.function.arguments); // S203: validated args
    // S766: context-aware label — mostra query/path/comando specifico invece del tipo tool generico
    steps.push({ tool: tc.function.name, args: _parsed0.args, result: "", status: "running", explanation: narrativeLabel(tc.function.name, _parsed0.args) });
    newStepIndices.push(steps.length - 1);
  }
  onSteps([...steps]);

  // ── 3. Esecuzione parallela (max 4) con CB + stall detection ──────────────
  const results = await pLimitPool(
    toolCalls.map((tc) => async () => {
      // S203: Validate + repair LLM-generated args before ANY execution
      const _pv = _parseToolArgs(tc.function.arguments);
      const args: Record<string, unknown> = _pv.args;
      if (!_pv.valid) {
        const _errMsg = `❌ [ARGS_INVALID] "${tc.function.name}" non eseguito: argomenti JSON non riparabili. ${_pv.error ?? ""} Rigenera la chiamata con JSON valido.`;
        console.warn("[S203] tool args JSON non riparabile", tc.function.name, tc.function.arguments);
        return { tc, result: _errMsg, durationMs: 0, args };
      }
      if (_pv.repaired) {
        console.log("[S203] tool args riparati da repairJson", tc.function.name); // check-console-log: ok
      }
      // Circuit breaker: skip tripped tools
      if (cbIsOpen(tc.function.name, iter)) {
        onStatus(`⚡ ${tc.function.name} saltato (circuit open)`);
        return { tc, result: cbSkipMsg(tc.function.name), durationMs: 0, args };
      }
      // Gap B (S122): stall detection — abort repeated identical calls
      const _c1StallN = stallCheck(tc.function.name, args);
      if (_c1StallN >= 3) {
        // S444: hint cross-sessione per messaggio stallo
        const _c1ErrHint = (() => {
          try {
            const _wf = errorLog.resolvedWithFix().find(e => e.context.includes(tc.function.name));
            return _wf ? `\n💡 Fix noto (${_wf.count}× visto): ${_wf.fix!.slice(0, 200)}` : "";
          } catch { return ""; }
        })();
        return { tc, result: `❌ Stallo rilevato — "${tc.function.name}" chiamato ${_c1StallN}× con gli stessi argomenti. Cambia approccio.${_c1ErrHint}`, durationMs: 0, args };
      }
      const start  = Date.now();
      const result = await executeToolGated(tc.function.name, args);
      cbUpdate(tc.function.name, result, iter);
      return { tc, result, durationMs: Date.now() - start, args };
    }),
  );

  // ── 4. Processa i risultati ────────────────────────────────────────────────
  let anyError = false;
  const _failureRecoveries: Array<{ toolName: string; result: ReturnType<typeof recordAndSuggestFix> }> = [];

  for (let i = 0; i < results.length; i++) {
    const { tc, result, durationMs, args } = results[i];
    const si = newStepIndices[i];
    const _vr         = verifyToolResult(tc.function.name, args, result);
    const _annotated  = annotateWithProof(tc.function.name, result, _vr);
    steps[si].result     = result;
    steps[si].status     = result.startsWith("❌") ? "error" : "done";
    steps[si].durationMs = durationMs;
    // Step2: push annotated result con epistemic tag al modello
    const _epTag1        = epistemicTag(tc.function.name);
    const _taggedAnnotated = `[EPISTEMIC:${_epTag1}] ${_annotated}`;
    loopMessages.push({ role: "tool", content: _taggedAnnotated, tool_call_id: tc.id, name: tc.function.name } as ApiMsg);
    // Step5: update world model (fire-and-forget)
    updateWorldModel(tc.function.name, args, result).catch(() => {});

    if (result.startsWith("❌")) {
      anyError = true;
      try { confSession.recordSignal("tool_failure"); } catch { /* non-blocking */ }
      // S444: registra su errorLog per hint cross-sessione
      try { errorLog.record(result.slice(0, 300), `tool:${tc.function.name}`, undefined, typeof args.code === "string" ? args.code.slice(0, 500) : undefined); } catch { /* non-blocking */ }
      // S204 GAP1: deriva fix dall'alternativa nota prima di registrare l'errore
      const _g1fix = (() => {
        try { const _a = selfLearning.getAlternative(tc.function.name, result.slice(0, 150)); return _a ? `Usa ${_a.tool}: ${_a.hint.slice(0, 200)}` : ""; } catch { return ""; }  // S610: 80→150
      })();
      recordErrorAsync(result, `tool:${tc.function.name}`, _g1fix); // S649
      try { _failureRecoveries.push({ toolName: tc.function.name, result: recordAndSuggestFix({ toolName: tc.function.name, errorMsg: result, args }) }); } catch { /* non-blocking */ }
      // S59: live debug-fix per code execution tools
      let _liveFixed: string | null = null;
      // S59 original: EXEC_TOOLS → debugLoop + selfHealingEngine (code)
      if (!_liveFixed) {
        _liveFixed = await _tryLiveDebugFix(tc.function.name, args, result, `iter${iter}`, onStatus);
      }
      // S697: selfHealingEngine for ALL tool types (transient/structural errors)
      if (!_liveFixed) {
        const _s697sig = buildErrorSignature(result, tc.function.name, args, iter, 0);
        const _hasQuickStrategy =
          _s697sig.category === 'not_found'    ||
          _s697sig.category === 'timeout'      ||
          _s697sig.category === 'rate_limit'   ||
          _s697sig.category === 'cors'         ||
          _s697sig.category === 'network_fail' ||
          _s697sig.isTransient;
        if (_hasQuickStrategy) {
          const _s697healed = await selfHealingEngine.run({
            tool: tc.function.name, args, errorResult: result,
            taskId: loopTaskId ?? `iter${iter}`,
            iteration: iter, onStatus, signal,
            executeToolFn: executeToolGated,
          });
          if (_s697healed.healed) _liveFixed = _s697healed.result;
        }
      }
      if (_liveFixed) {
        // S204+: registra fix immediatamente — il modello riceverà il risultato corretto, non l'errore
        try {
          recordErrorAsync(result.slice(0, 100), `livefix:${tc.function.name}`, _liveFixed.slice(0, 250)); // S649
        } catch { /* non-blocking */ }
        // S444: marca errorLog come risolto con fix applicato (cross-sessione)
        try { errorLog.markFixed(errorLog.hashOf(result.slice(0, 300)), _liveFixed.slice(0, 500)); } catch { /* non-blocking */ }
        steps[si].result = _liveFixed; steps[si].status = "done";
        loopMessages[loopMessages.length - 1] = { role: "tool", content: _liveFixed, tool_call_id: tc.id, name: tc.function.name } as ApiMsg;
        anyError = false;
        sessStats.autoFixed++; // S205: error resolved autonomously
        // Fix 8 (S421): extra iteration quando l'agente è in modalità repair intensivo
        if (sessStats.autoFixed >= 2 && effectiveMaxIter < MAX_ITER) {
          effectiveMaxIter = Math.min(effectiveMaxIter + 1, MAX_ITER);
        }
      } else {
        sessStats.propagated++; // S205: error reaches model unchanged
      }
    } else {
      try { notifyToolSuccess(tc.function.name); } catch { /* non-blocking */ }
      try { confSession.recordSignal("tool_success"); } catch { /* non-blocking */ }
    }
    // S83: track exec result for loop closure (Case 1)
    if (EXEC_REINJECT_TOOLS.has(tc.function.name)) {
      lastExecResultIter = iter;
      lastExecOutput     = result.slice(0, 1000);
      lastExecTool       = tc.function.name;
      loopMessages.push({ role: "user", content: buildExecReinjectMessage(lastExecTool, lastExecOutput) } as ApiMsg);
    }
  }
  onSteps([...steps]);


  // ── P32-GE-1: Infra error graceful exit ─────────────────────────────────────
  // Scansiona le ultime tool-result messages per rilevare ≥3 errori consecutivi
  // della stessa categoria infrastrutturale → exit onesto invece di loop infinito.
  {
    const _c1ToolMsgs = (loopMessages as Array<{ role: string; content?: unknown }>)
      .filter(m => m.role === "tool" && typeof m.content === "string")
      .slice(-9); // ultime 9 risposte (max 3 iter × 3 tool)
    let _c1InfraCount = 0;
    let _c1InfraCat: string | null = null;
    for (let _i = _c1ToolMsgs.length - 1; _i >= 0; _i--) {
      const _cnt = _c1ToolMsgs[_i].content as string;
      // rimuovi prefix epistemic tag [EPISTEMIC:...] per l'analisi
      const _raw = _cnt.replace(/^[EPISTEMIC:[^]]+]s*/, "");
      if (!_raw.startsWith("❌")) break;
      const _cat = infraCategory(_raw);
      if (_cat === null) break;
      if (_c1InfraCat === null) _c1InfraCat = _cat;
      if (_cat !== _c1InfraCat) break;
      _c1InfraCount++;
    }
    if (_c1InfraCount >= 3 && _c1InfraCat) {
      const _infraMsgMap: Record<string, string> = {
        rate_limit:   "Il provider è in rate limit (429) ripetuto",
        timeout:      "Timeout ripetuto dal provider o backend",
        server_5xx:   "Errore server 5xx ripetuto dal backend",
        network_fail: "Errore di rete persistente",
      };
      const _infraLabel = _infraMsgMap[_c1InfraCat] ?? "Errore infrastrutturale ripetuto";
      onChunk(`_(${_infraLabel} — rilevato ${_c1InfraCount}× di seguito. Il servizio è temporaneamente non disponibile. Riprova tra qualche minuto o cambia provider nelle impostazioni.)_`);
      writeSess();
      return {
        action: "return",
        formalGoal,
        consecutiveAllFailIters,
        effectiveMaxIter,
        sessStats,
        lastExecTool,
        lastExecOutput,
        lastExecResultIter,
      };
    }
  }

  // ── 5. ReasoningCore update + belief state persistence ────────────────────
  onReasoningUpdate({
    last_result:    results.filter(r => !r.result.startsWith("❌")).map(r => r.tc.function.name + "✓").join(" ").slice(0, 200) || undefined,
    error:          anyError ? results.filter(r => r.result.startsWith("❌")).map(r => r.tc.function.name).join(", ") : undefined,
    completed_step: results.filter(r => !r.result.startsWith("❌")).map(r => r.tc.function.name).join(", ") || undefined,
  });

  // S351: persist belief state per batch error Case 1 (non-blocking)
  if (anyError) {
    for (const { result: _brr } of results) {
      if (_brr.startsWith("❌")) { try { persistBeliefState(loopTaskId ?? "", lastUserMsg.slice(0, 40)); } catch { /* non-blocking */ } break; }
    }
  }

  // ── 6. Case 1 tail (stagnation + belief revision + DONE check + synthesis) ─
  // S496: → agentLoop/case1TailBlock.ts
  const _c1t = processCase1Tail({
    results, failureRecoveries: _failureRecoveries, anyError,
    consecutiveAllFailIters, effectiveMaxIter,
    steps, loopMessages, iter, isCodeTask,
    rawText: rawText ?? null, signal, lastUserMsg,
    loopTaskId, onChunk, onSteps, onStatus,
    onSuggestions,
    emitFinalText, writeSess,
  });
  consecutiveAllFailIters = _c1t.newConsecutiveAllFailIters;
  effectiveMaxIter        = _c1t.newEffectiveMaxIter;

  return {
    action: _c1t.action === "return" ? "return"
          : _c1t.action === "return-success" ? "return-success"
          : "continue",
    formalGoal,
    consecutiveAllFailIters,
    effectiveMaxIter,
    sessStats,
    lastExecTool,
    lastExecOutput,
    lastExecResultIter,
  };
}