/**
 * codeVerificationBlock.ts — S496: extracted from agentLoop.ts
 *
 * Pipeline di verifica codice pre-streaming (solo per task di codice):
 *
 * 1. Acceptance Gate (S411/S413): REQ-001..N pipeline strutturata
 *    - Se requisiti critici falliscono + iter disponibili → continue
 *    - Se tutti i REQ passano → prependi checklist al finalText
 *
 * 2. Runtime Verifier (S415): analisi statica codice VFS
 *    - Errori critici + iter disponibili → continue (repair hint)
 *    - Solo warning → prependi badge, non blocca
 *
 * 3. Shell Verifier (S415b): node --check / tsc --noEmit via LLM
 *    - Shell check fallito → continue con repair hint
 *    - Shell check non ancora eseguito → richiede all'LLM di eseguirlo → continue
 *
 * 4. Build Validator (S424): npm run build
 *    - Build fallita → continue con repair hint
 *    - Build non ancora eseguita → richiede all'LLM → continue
 *
 * NOTIF-V2: incident registry integrato — ogni failure registrato in incidentRegistry
 *   (dedup 60s, getRegressionInfo() usabile per detection pattern ricorrenti).
 *
 * Restituisce { shouldContinue, finalText }.
 * steps e loopMessages vengono mutati direttamente (passed by reference).
 *
 * @module codeVerificationBlock
 */

import type { AgentStep } from "../storage";
import type { ApiMsg } from "./networkTools";
import type { GoalContract } from "../_goalVerifier";
import { registerIncident } from "../incidentRegistry"; // NOTIF-V2

export interface CodeVerifCtx {
  formalGoal: GoalContract | null;
  steps: AgentStep[];
  iter: number;
  MAX_ITER: number;
  loopMessages: ApiMsg[];
  onStatus: (msg: string) => void;
  onSteps: (steps: AgentStep[]) => void;
  signal?: AbortSignal;
  lastUserMsg: string;
  finalText: string;
  _isCodeTask: boolean;
  /** taskId opzionale — propagato all'incident registry per correlazione */
  taskId?: string | null;
}

export interface CodeVerifResult {
  shouldContinue: boolean;
  finalText: string;
}

/**
 * Esegue la pipeline di verifica codice (acceptance + runtime + shell + build).
 * Restituisce { shouldContinue, finalText } — mai lancia.
 */
export async function runCodeVerificationBlock(ctx: CodeVerifCtx): Promise<CodeVerifResult> {
  const { formalGoal, steps, iter, MAX_ITER, loopMessages, onStatus, onSteps, signal, lastUserMsg, _isCodeTask, taskId } = ctx;
  let finalText = ctx.finalText;

  if (!_isCodeTask || !formalGoal || signal?.aborted) {
    return { shouldContinue: false, finalText };
  }

  // ── P45: AST Check (step 0) ────────────────────────────────────────────────
  // Verifica sintattica IMMEDIATA via TypeScript compiler API — zero shell.
  // Intercetta errori di sintassi prima che l'acceptance gate li valuti,
  // evitando cicli inutili di esecuzione su file già rotti.
  if (iter < MAX_ITER - 2 && !signal?.aborted) {
    try {
      const { vfsAsync: _acVfs }             = await import("../vfsDb");
      const { astCheck, buildAstRepairHint } = await import("../astCheck");
      const _acRaw   = await _acVfs.list();
      const _acFiles = _acRaw.filter(
        (f: { path?: string; content?: unknown }) =>
          f.path && typeof f.content === "string" && /\.[jt]sx?$|\.m[jt]s$/.test(f.path as string),
      );

      // Controlla max 12 file — bilancia completezza e performance
      for (const _acF of _acFiles.slice(0, 12)) {
        if (signal?.aborted) break;
        const _acRes = await astCheck(_acF.content as string, _acF.path as string);
        if (!_acRes.ok && _acRes.errors.length > 0) {
          const _acHint = buildAstRepairHint(_acF.path as string, _acRes.errors, _acF.content as string);
          steps.push({
            tool:   "_ast_check",
            args:   {},
            result: `❌ AST: ${_acRes.errors.length} errore/i sintattico/i in \`${_acF.path}\` (riga ${_acRes.errors[0].line})`,
            status: "done",
            at:     Date.now(),
          } as AgentStep);
          onSteps([...steps]);
          onStatus(`AST check: sintassi non valida in ${_acF.path} — correzione autonoma…`);
          try {
            registerIncident("ast_syntax_error", "tool", "error", {
              file:   _acF.path,
              errors: _acRes.errors.slice(0, 3).map((e: { line: number; message: string }) => `L${e.line}: ${e.message.slice(0, 80)}`),
              iter,
            }, taskId ?? undefined);
          } catch { /* non-blocking */ }
          loopMessages.push({ role: "user", content: _acHint } as ApiMsg);
          return { shouldContinue: true, finalText };
        }
      }
    } catch { /* AST check è best-effort — non blocca mai la risposta */ }
  }

  // ── S411/S413: Acceptance Gate ─────────────────────────────────────────────
  try {
    const { vfsAsync: _agVfs }              = await import("../vfsDb");
    const { runAcceptancePipeline: _agRap } = await import("../requirementDecomposer");
    const { runAcceptanceTests: _agRat }    = await import("../goalTestDeriver");
    const _agRaw   = await _agVfs.list();
    const _agFiles = _agRaw
      .filter(f => f.path && f.content)
      .map(f => ({ path: f.path, content: f.content as string }));
    if (_agFiles.length > 0) {
      const _goalStr = (formalGoal as GoalContract).goal;
      const _agPipe  = _agRap(_goalStr, _agFiles);
      const _agRep   = _agRat(_goalStr, _agFiles);
      const _failing = _agPipe.total > 0
        ? _agPipe.results.filter((r: { status: string; reqId: string; feature: string }) => r.status === "failed").map((r: { reqId: string; feature: string }) => `${r.reqId}(${r.feature})`)
        : _agRep.tests.filter((t: { pass: boolean; requirement: string }) => !t.pass).map((t: { requirement: string }) => t.requirement);
      if (!_agRep.allGreen && _agRep.total > 0 && _agRep.hint && iter < MAX_ITER - 2) {
        const _label = _agPipe.total > 0
          ? `📋 ${_agPipe.passed}/${_agPipe.total} REQ`
          : `${_agRep.passed}/${_agRep.total}`;
        steps.push({
          tool:   "_acceptance_gate",
          args:   {},
          result: `${_label} — mancanti: ${(_failing as string[]).slice(0, 3).join("; ")}`,
          status: "done",
          at:     Date.now(),
        } as AgentStep);
        onSteps([...steps]);
        onStatus(`Acceptance gate: ${_agPipe.total > 0 ? _agPipe.passed + "/" + _agPipe.total + " REQ" : _agRep.passed + "/" + _agRep.total} — completamento requisiti…`);
        // NOTIF-V2: acceptance failure → registry (dedup evita spam su loop rapidi)
        try {
          registerIncident("acceptance_fail", "validator", "warning", {
            failing:   (_failing as string[]).slice(0, 5),
            passed:    _agRep.passed,
            total:     _agRep.total,
            iter,
          }, taskId ?? undefined);
        } catch { /* non-blocking */ }
        // S697: anti-loop — if same hint injected 2+ times → escalate to rewrite
        const _recentMsgs = loopMessages.filter(m => m.role === "user").slice(-4).map(m => String(m.content).slice(0, 100));
        const _hintFp     = (_agRep.hint ?? "").slice(0, 100);
        const _alreadyLooping = _recentMsgs.filter(h => h === _hintFp).length >= 2;
        if (_alreadyLooping && iter < MAX_ITER - 2) {
          const _escalHint = `I tentativi precedenti non hanno risolto: ${(_failing as string[]).slice(0, 3).join(", ")}. RISCRIVI dall'inizio solo le parti che falliscono, con un approccio completamente diverso.`;
          loopMessages.push({ role: "user", content: _escalHint } as ApiMsg);
        } else {
          loopMessages.push({ role: "user", content: _agRep.hint } as ApiMsg);
        }
        try {
          const { recordRuntimeRepair: _rrp } = await import("../repairAuditor");
          _rrp(lastUserMsg, (_failing as string[]).slice(0, 5), _agRep.hint ?? "");
        } catch { /* non-blocking */ }
        return { shouldContinue: true, finalText };
      }
      if (_agPipe.total > 0 && _agPipe.allGreen && _agPipe.checklist) {
        steps.push({
          tool:   "_acceptance_gate",
          args:   {},
          result: `📋 Acceptance OK — ${_agPipe.passed}/${_agPipe.total} REQ soddisfatti`,
          status: "done",
          at:     Date.now(),
        } as AgentStep);
        onSteps([...steps]);
        finalText = _agPipe.checklist + "\n\n" + finalText;
      }
    }
  } catch { /* acceptance gate è best-effort — non blocca mai la risposta */ }

  // ── S415: Runtime Verifier ─────────────────────────────────────────────────
  if (signal?.aborted) return { shouldContinue: false, finalText };
  try {
    const { vfsAsync: _rvVfs }        = await import("../vfsDb");
    const { verifyRuntime: _rvCheck } = await import("../runtimeVerifier");
    const _rvRaw   = await _rvVfs.list();
    const _rvFiles = _rvRaw
      .filter(f => f.path && f.content)
      .map(f => ({ path: f.path, content: f.content as string }));
    if (_rvFiles.length > 0) {
      const _rvResult = _rvCheck(_rvFiles, (formalGoal as GoalContract).goal);
      steps.push({
        tool:   "_runtime_verifier",
        args:   {},
        result: _rvResult.summary,
        status: "done",
        at:     Date.now(),
      } as AgentStep);
      onSteps([...steps]);
      if (_rvResult.hasCritical && _rvResult.repairHint && iter < MAX_ITER - 2) {
        onStatus(`Runtime check: ${_rvResult.issues.filter((i: { severity: string }) => i.severity === "error").length} errore/i critico/i — correzione autonoma…`);
        // NOTIF-V2: runtime error critico → severity "error" → getRegressionInfo() lo conterà
        try {
          const _criticalMsgs = _rvResult.issues
            .filter((i: { severity: string }) => i.severity === "error")
            .map((i: { message: string }) => i.message.slice(0, 80));
          registerIncident("runtime_error", "validator", "error", {
            issues: _criticalMsgs.slice(0, 5),
            iter,
          }, taskId ?? undefined);
        } catch { /* non-blocking */ }
        try {
          const { recordRuntimeRepair } = await import("../repairAuditor");
          const _rvGoal  = (formalGoal as GoalContract).goal;
          const _rvMsgs  = _rvResult.issues
            .filter((i: { severity: string }) => i.severity === "error")
            .map((i: { message: string }) => i.message);
          recordRuntimeRepair(_rvGoal, _rvMsgs, _rvResult.repairHint);
        } catch { /* non-blocking */ }
        loopMessages.push({ role: "user", content: _rvResult.repairHint } as ApiMsg);
        return { shouldContinue: true, finalText };
      }
      if (!_rvResult.hasCritical) {
        try {
          const { markRepairsSuccessful } = await import("../repairAuditor");
          const _rvGoal = (formalGoal as GoalContract).goal;
          const _rvWarn = _rvResult.issues.filter((i: { severity: string }) => i.severity === "warning").map((i: { message: string }) => i.message);
          if (_rvWarn.length > 0 && iter > 1) markRepairsSuccessful(_rvGoal, _rvWarn);
        } catch { /* non-blocking */ }
      }

      // S415b: Shell Verifier
      if (!_rvResult.hasCritical && iter >= 1) {
        try {
          const { buildShellVerifyPrompt, parseShellCheckFromSteps, formatShellCheckRepairHint, detectEntryPoint } = await import("../shellVerifier");
          const _scResult = parseShellCheckFromSteps(steps as { tool?: string; args?: Record<string, unknown>; result?: string }[]);
          if (_scResult.checked && !_scResult.ok && _scResult.errors.length > 0 && iter < MAX_ITER - 2) {
            const _scEntry = detectEntryPoint(_rvFiles)?.path ?? "entry point";
            const _scHint  = formatShellCheckRepairHint(_scResult.errors, _scEntry, _scResult.cmd);
            steps.push({
              tool:   "_shell_verifier",
              args:   {},
              result: `❌ Shell check fallito: ${_scResult.errors.slice(0, 3).join(" | ")}`,
              status: "done",
              at:     Date.now(),
            } as AgentStep);
            onSteps([...steps]);
            onStatus(`Shell check: ${_scResult.errors.length} errore/i — correzione autonoma…`);
            // NOTIF-V2: shell check failure → "error" severity
            try {
              registerIncident("shell_check_fail", "validator", "error", {
                cmd:    _scResult.cmd ?? "",
                errors: _scResult.errors.slice(0, 5),
                iter,
              }, taskId ?? undefined);
            } catch { /* non-blocking */ }
            loopMessages.push({ role: "user", content: _scHint } as ApiMsg);
            return { shouldContinue: true, finalText };
          }
          if (!_scResult.checked && iter < MAX_ITER - 2) {
            const _scPrompt = buildShellVerifyPrompt(
              _rvFiles,
              steps as { tool?: string; args?: Record<string, unknown>; result?: string }[],
              iter,
            );
            if (_scPrompt) {
              steps.push({
                tool:   "_shell_verifier",
                args:   {},
                result: "⏳ Shell check richiesto — in attesa di execute_shell…",
                status: "done",
                at:     Date.now(),
              } as AgentStep);
              onSteps([...steps]);
              loopMessages.push({ role: "user", content: _scPrompt } as ApiMsg);
              return { shouldContinue: true, finalText };
            }
          }
        } catch { /* non-blocking — shell verifier è best-effort */ }
      }

      // S424: Build Validator
      if (!_rvResult.hasCritical && iter >= 2) {
        try {
          const {
            buildBuildPrompt:          _bbPrompt,
            parseBuildResultFromSteps: _bbParse,
            formatBuildRepairHint:     _bbHint,
          } = await import("../buildRunner");
          const _brResult = _bbParse(steps as { tool?: string; args?: Record<string, unknown>; result?: string }[]);
          if (_brResult.checked && !_brResult.ok && _brResult.errors.length > 0 && iter < MAX_ITER - 2) {
            steps.push({
              tool:   "_build_validator",
              args:   {},
              result: `❌ Build fallita (${_brResult.cmd}): ${_brResult.errors.slice(0, 3).join(" | ")}`,
              status: "done",
              at:     Date.now(),
            } as AgentStep);
            onSteps([...steps]);
            onStatus(`Build validator: ${_brResult.errors.length} errore/i — correzione autonoma…`);
            // NOTIF-V2: build failure → "error" severity (stessa event key per regressioni)
            try {
              registerIncident("build_fail", "validator", "error", {
                cmd:    _brResult.cmd ?? "",
                errors: _brResult.errors.slice(0, 5),
                iter,
              }, taskId ?? undefined);
            } catch { /* non-blocking */ }
            loopMessages.push({ role: "user", content: _bbHint(_brResult.errors, _brResult.cmd) } as ApiMsg);
            return { shouldContinue: true, finalText };
          }
          if (!_brResult.checked && iter < MAX_ITER - 2) {
            const _buildPrompt = _bbPrompt(
              _rvFiles,
              steps as { tool?: string; args?: Record<string, unknown>; result?: string }[],
              iter,
            );
            if (_buildPrompt) {
              steps.push({
                tool:   "_build_validator",
                args:   {},
                result: "⏳ Build validation richiesta — in attesa di execute_shell…",
                status: "done",
                at:     Date.now(),
              } as AgentStep);
              onSteps([...steps]);
              loopMessages.push({ role: "user", content: _buildPrompt } as ApiMsg);
              return { shouldContinue: true, finalText };
            }
          }
          if (_brResult.checked && _brResult.ok) {
            steps.push({
              tool:   "_build_validator",
              args:   {},
              result: "✅ Build completata con successo",
              status: "done",
              at:     Date.now(),
            } as AgentStep);
            onSteps([...steps]);
          }
        } catch { /* non-blocking — build validator è best-effort */ }
      }
    }
  } catch { /* non-blocking — runtime verifier è best-effort */ }

  return { shouldContinue: false, finalText };
}