/**
 * doneSignalProcessor.ts — S496: extracted from agentLoop.ts
 *
 * S99-Cosa3: gestisce il segnale DONE: {summary} che il modello emette
 * quando si auto-dichiara completato.
 *
 * Comportamento:
 * 1. Se rawText NON contiene "DONE:" → action="skip" (nessun processing)
 * 2. Salva il summary nel worldState (fire-and-forget)
 * 3. Estrae finalText dal testo dopo DONE:
 * 4. Se formalGoal → verifica con verifyGoal:
 *    - Non soddisfatto + iter disponibili → inietta recovery → action="continue"
 *    - Soddisfatto → addDecision
 * 5. Streama finalText e segnala action="return" (caller esce dalla funzione)
 *
 * Muta steps e loopMessages direttamente (by reference).
 *
 * @module doneSignalProcessor
 */

import type { AgentStep } from "../storage";
import type { ApiMsg } from "./networkTools";
import type { GoalContract } from "../_goalVerifier";
import { verifyGoal, buildRecoveryPrompt } from "../_goalVerifier";
import { normalizeLlmText } from "../utils/normalizeLlmOutput";
import { validateGate as _doneVg } from "../agent/validationGate"; // P30-TG
import { recordErrorAsync } from "../selfLearningAsync"; // S649
import { addDecision } from "../projectMemory";
import { generateSuggestions, type Suggestion } from "../agent/SmartSuggestions";

export interface DoneSignalCtx {
  rawText:       string;
  formalGoal:    GoalContract | null;
  steps:         AgentStep[];
  iter:          number;
  MAX_ITER:      number;
  loopMessages:  ApiMsg[];
  onStatus:      (msg: string) => void;
  onSteps:       (steps: AgentStep[]) => void;
  signal?:       AbortSignal;
  lastUserMsg:   string;
  sessStats:     { verifyFails: number };
  emitFinalText: (text: string, signal?: AbortSignal) => void;
  onSuggestions: ((s: Suggestion[]) => void) | undefined;
  writeSess:     () => void;
  /** GAP-N3: auto-validate VFS project prima del DONE — opzionale, no-op se assente */
  executeToolGated?: (tool: string, args: Record<string, unknown>) => Promise<string>;
}

export type DoneSignalAction = "skip" | "continue" | "return";

export interface DoneSignalResult {
  action:            DoneSignalAction;
  finalText:         string;
  routeQualityScore: number | undefined;
}

export async function processDoneSignal(ctx: DoneSignalCtx): Promise<DoneSignalResult> {
  const {
    rawText, formalGoal, steps, iter, MAX_ITER,
    loopMessages, onStatus, onSteps, signal, lastUserMsg,
    sessStats, emitFinalText, onSuggestions, writeSess,
  } = ctx;

  // GAP-DONE-REGEX-MULTILINE: strip code blocks prima del match
  const _rawStripped = rawText.replace(/```[\s\S]*?```/g, '').replace(/<code>[\s\S]*?<\/code>/gi, '');
  const _doneMatch = _rawStripped.match(/^DONE:\s*(.+)$/m);
  if (!_doneMatch) return { action: "skip", finalText: rawText, routeQualityScore: undefined };

  const _doneSummary = _doneMatch[1].trim();

  // Fire-and-forget: salva summary nel worldState per continuità sessione
  (async () => {
    try {
      const { vfsDb: _vfsDbDone } = await import("../vfsDb");
      await _vfsDbDone.worldState.add({
        id:        Date.now().toString(36) + Math.random().toString(36).slice(2, 5),
        type:      "build_ok" as const,
        path:      "",
        summary:   _doneSummary,
        timestamp: Date.now(),
        topic:     lastUserMsg.slice(0, 50),
      });
    } catch { /* non-blocking */ }
  })();

  // Estrai finalText: testo dopo la riga DONE: (strip think tags)
  let finalText = rawText
    .replace(/<think>[\s\S]*?<\/think>/gi, "")
    .replace(/<think>[\s\S]*/gi, "")
    .replace(/^DONE:.*$/m, "")
    .trim();
  if (!finalText) finalText = _doneSummary;
  finalText = normalizeLlmText(finalText) || finalText;

  let routeQualityScore: number | undefined;

  // S203+: VERIFY prima dello streaming — se fallisce e ci sono iter, riprendi
  if (formalGoal && !signal?.aborted) {
    try {
      const _vr = verifyGoal(formalGoal, steps, finalText, signal);
      routeQualityScore = _vr.score;

      steps.push(_vr.step);
      onSteps([...steps]);

      if (!_vr.satisfied && iter < MAX_ITER - 1) {  // S701: -2→-1
        sessStats.verifyFails++;
        // S204 GAP4: registra failure in selfLearning
        try {
          const _g4fix = _vr.failedDimensions.map(d => `[${d.name}] ${d.detail}`).join("; ");
          recordErrorAsync( // S649
            `VERIFY_FAIL: DONE_WHEN="${formalGoal.doneWhen.slice(0, 80)}" score=${Math.round(_vr.score * 100)}%`,
            `verify:goal="${formalGoal.goal.slice(0, 60)}"`,
            _g4fix,
          );
        } catch { /* non-blocking */ }

        onStatus(`Verifica fallita (${Math.round(_vr.score * 100)}%) — ripristino autonomo…`);
        const _recov = buildRecoveryPrompt(_vr, formalGoal);
        loopMessages.push({ role: "user", content: _recov } as ApiMsg);
        return { action: "continue", finalText, routeQualityScore };
      } else if (!_vr.satisfied && _vr.score < 0.35 && iter < MAX_ITER) {  // S701: hard block — score critico (<35%) → forza ultimo tentativo (GAP-VERIFY-S701-OVERLAP: else if)
        sessStats.verifyFails++;
        try {
          recordErrorAsync(
            `VERIFY_CRITICAL: score=${Math.round(_vr.score * 100)}% iter=${iter}/${MAX_ITER}`,
            `verify:goal="${formalGoal.goal.slice(0, 60)}"`,
            _vr.failedDimensions.map(d => `[${d.name}] ${d.detail}`).join('; '),
          );
        } catch { /* non-blocking */ }
        onStatus(`Score critico (${Math.round(_vr.score * 100)}%) — ultimo tentativo forzato…`);
        const _recovCrit = buildRecoveryPrompt(_vr, formalGoal);
        loopMessages.push({ role: 'user', content: `${_recovCrit}\n\n⚠️ SCORE CRITICO — ricostruire la risposta da zero.` } as ApiMsg);
        return { action: 'continue', finalText, routeQualityScore };
      }
      // S454: addDecision su PASS
      if (_vr.satisfied) {
        try {
          addDecision({
            type:     "BUG_RESOLVED",
            feature:  formalGoal.goal.slice(0, 40),
            decision: finalText.slice(0, 120),
            reason:   `GoalVerifier PASS score=${Math.round(_vr.score * 100)}%`,
            affects:  [],
          });
        } catch { /* non-blocking */ }

        // S302: Audit Engine (Profilo D) — double-check zona grigia [0.35, 0.82]
        // Previene false chiusure: score convincente ma non pieno → provider alternativo.
        // Fail-open: UNKNOWN non blocca mai il task.
        if (_vr.score >= 0.35 && _vr.score <= 0.82 && iter < MAX_ITER - 1 && !signal?.aborted) {
          try {
            const { runGoalAudit } = await import("./goalAuditEngine");
            onStatus("🔍 Audit indipendente (Profilo D)…");
            const _s302 = await runGoalAudit(
              formalGoal.goal, formalGoal.doneWhen, finalText, "groq",
            );
            if (_s302.verdict === "FAIL") {
              sessStats.verifyFails++;
              onStatus("⚠️ Audit Profilo D: risposta incompleta — mi autocorreggo…");
              loopMessages.push({
                role: "user",
                content: `[S302 AUDIT ENGINE — ${_s302.provider}]\n${_s302.reason} (score audit=${Math.round(_s302.score * 100)}%)\n\nRiprendi il task e completa quanto rilevato mancante prima di concludere.`,
              } as ApiMsg);
              return { action: "continue", finalText, routeQualityScore };
            }
          } catch { /* fail-open — non blocca mai il task */ }
        }

        // S766-MEM-RANK: feedback positivo sulle memorie iniettate (fire-and-forget)
        try {
          const { sendMemoryFeedback } = await import("./loopMemoryBlock");
          sendMemoryFeedback("PASS");
        } catch { /* non-blocking */ }
      }
    } catch { /* non-blocking — verifica mai interrompe il flusso */ }
  }

  // GAP-1: auto-validate + repair loop (max 2 iter) prima del DONE — never blocking
  if (ctx.executeToolGated && !signal?.aborted) {
    try {
      const { vfsDb: _vfsDbVal } = await import("../vfsDb");
      const _allFiles = await _vfsDbVal.files.toArray();
      const _hasCode = (_allFiles as Array<{ path: string }>).some(f => /\.(ts|tsx|py|js|jsx)$/.test(f.path));
      if (_hasCode) {
        const MAX_REPAIR_ITER = 2;
        // Conta i repair già tentati in questa sessione per evitare loop infiniti
        const _repairsDone = steps.filter(s => s.tool === "_repair_validator").length;
        if (_repairsDone < MAX_REPAIR_ITER) {
          onStatus(`Verifico il progetto… (${_repairsDone + 1}/${MAX_REPAIR_ITER})`);
          const _valResult = await ctx.executeToolGated("validate_project", {});
          if (_valResult && _valResult.startsWith("❌")) {
            // Traccia il tentativo di repair nello steps array
            steps.push({ tool: "_repair_validator", args: { iter: _repairsDone + 1 }, result: _valResult.slice(0, 200), status: "error" });
            onSteps([...steps]);
            if (_repairsDone + 1 < MAX_REPAIR_ITER && iter + 1 < MAX_ITER) {
              // Budget repair e iter disponibili → rilancia il loop per auto-riparazione
              onStatus("Trovati errori — auto-riparazione in corso…");
              loopMessages.push({ role: "user", content: [
                "Il progetto ha fallito la validazione automatica.",
                "Report errori:\n" + _valResult.slice(0, 600),
                "Fixa TUTTI gli errori usando write_file o apply_patch.",
                "Poi scrivi DONE quando il progetto è pulito.",
              ].join("\n") } as ApiMsg);
              return { action: "continue", finalText, routeQualityScore };
            } else {
              // Budget esaurito → appende il report come fallback informativo
              finalText = finalText + "\n\n---\n⚠️ **Validazione automatica:**\n" + _valResult.slice(2).trim().slice(0, 500);
            }
          }
        }
      }
    } catch { /* non-blocking — la validazione non blocca mai il completamento */ }
  }

  // Goal soddisfatto (o iter esaurite) → stream + return
  onSteps([...steps]);
  // P30-TG: validateGate normalizza markdown + ripara code blocks prima dell'emissione.
  try { const _g = _doneVg(finalText, { taskHint: lastUserMsg.slice(0, 80), minQuality: 0 })  } catch { /* non-blocking */ }
  emitFinalText(finalText, signal);
  try { onSuggestions?.(generateSuggestions(lastUserMsg, steps)); } catch { /* non-blocking */ }
  writeSess();
  return { action: "return", finalText, routeQualityScore };
}