/**
 * Post-hoc LLM semantic audit — non-blocking queue for tools/call.
 * Sync path stays regex/semantic-guards only; LLM runs after JSON-RPC returns.
 */
import { Counter, Gauge } from 'prom-client';
import { LlmAssistant } from './llm-assistant.js';
import { getLlmCache, semanticToLlmCacheKey } from './llm-cache.js';
import { getLlmConfig } from '../config/llm-config.js';
import { Logger } from '../utils/logger.js';
import { StructuredLogger } from '../utils/structured-logger.js';
import { registry } from '../utils/metrics.js';
import { getGuardianRegionLabels } from '../utils/region.js';
import { isSemanticLlmConfigured, reportSemanticDegradation, } from '../utils/semantic-layer.js';
import { isLocalSemanticEnabled, scoreLocalSemanticRisk, } from './local-semantic-classifier.js';
import { isSemanticAsyncEnabledForTenant } from '../tenant/tenant-semantic-config.js';
import { withSemanticTimeout } from '../utils/semantic-timeout.js';
import { isSemanticCircuitOpen, recordSemanticLlmFailure, recordSemanticLlmSuccess, } from './semantic-circuit-breaker.js';
import { allowSemanticLlmCall, reportSemanticAuditSkipped, } from './semantic-llm-rate-limit.js';
import { broadcastDashboardEvent, emitFlowStep } from '../utils/dashboard-events.js';
import { routeSemanticModelForTenant } from './tenant-semantic-model.js';
import { isOpenCoreEnabled } from '../license/feature-tiers.js';
import { getLicenseClient } from '../license/license-client.js';
import { getEstimatedSemanticCostUsd, isTenantDailyBudgetExceeded, recordTenantDailySpend, } from '../services/tenant-budget.js';
const DEBOUNCE_MS = parseInt(process.env.GUARDIAN_SEMANTIC_DEBOUNCE_MS || '500', 10);
const MAX_QUEUE = parseInt(process.env.GUARDIAN_SEMANTIC_ASYNC_MAX_QUEUE || '200', 10);
const MIN_CONFIDENCE = parseFloat(process.env.GUARDIAN_SEMANTIC_MIN_CONFIDENCE || '0.6');
const semanticAuditQueued = new Counter({
    name: 'mcp_guardian_semantic_audit_queued_total',
    help: 'Async semantic audit jobs enqueued',
    labelNames: ['region'],
    registers: [registry],
});
const semanticAuditProcessed = new Counter({
    name: 'mcp_guardian_semantic_audit_processed_total',
    help: 'Async semantic audit jobs completed',
    labelNames: ['region', 'outcome'],
    registers: [registry],
});
const semanticAuditQueueDepth = new Gauge({
    name: 'mcp_guardian_semantic_audit_queue_depth',
    help: 'Current async semantic audit queue depth',
    registers: [registry],
});
const queue = [];
let processing = false;
let debounceTimer = null;
let llmByModel = new Map();
let stats = { processed: 0, flagged: 0, dropped: 0 };
export function isSemanticAsyncEnabled(tenantId) {
    return isSemanticAsyncEnabledForTenant(tenantId);
}
/** @internal test helper */
export function resetSemanticAuditStateForTests() {
    queue.length = 0;
    processing = false;
    if (debounceTimer)
        clearTimeout(debounceTimer);
    debounceTimer = null;
    llmByModel.clear();
    stats = { processed: 0, flagged: 0, dropped: 0 };
    semanticAuditQueueDepth.set(0);
}
export function getSemanticAuditStats() {
    return {
        queued: queue.length,
        processed: stats.processed,
        flagged: stats.flagged,
        dropped: stats.dropped,
        enabled: isSemanticAsyncEnabled(),
    };
}
function shouldStoreCalibrationRecord() {
    return process.env.GUARDIAN_SEMANTIC_STORE_CALIBRATION === 'true';
}
async function persistSemanticAudit(job, result, meta) {
    try {
        const { appendSemanticAuditRecord } = await import('./semantic-audit-store.js');
        return appendSemanticAuditRecord({
            requestId: job.requestId,
            serverName: job.serverName,
            toolName: job.toolName,
            syncDecision: job.syncDecision,
            semanticAudit: result,
            model: meta?.model,
            durationMs: meta?.durationMs,
            timestamp: job.timestamp,
            argumentsSnapshot: (await import('../utils/audit-args-snapshot.js')).snapshotAuditArguments(job.arguments),
        });
    }
    catch (err) {
        Logger.debug(`[async-semantic] Failed to persist audit record: ${err instanceof Error ? err.message : String(err)}`);
        return null;
    }
}
/** Wait for debounced async semantic queue (used by swarm live scenario before proxy exit). */
export async function flushSemanticAuditQueue(maxWaitMs = 15000) {
    const deadline = Date.now() + maxWaitMs;
    while (Date.now() < deadline) {
        if (debounceTimer) {
            clearTimeout(debounceTimer);
            debounceTimer = null;
            await drainQueue();
        }
        else if (!processing && queue.length === 0) {
            break;
        }
        await new Promise((r) => setTimeout(r, 100));
    }
    return getSemanticAuditStats();
}
function getLlm(tenantId) {
    const routing = routeSemanticModelForTenant(tenantId);
    const modelKey = routing.model || getLlmConfig().model;
    const cached = llmByModel.get(modelKey);
    if (cached)
        return cached;
    const assistant = new LlmAssistant(routing.model ? { model: routing.model } : undefined);
    llmByModel.set(modelKey, assistant);
    return assistant;
}
/** Enqueue async semantic audit (debounced batch drain). Never blocks the caller. */
export function enqueueSemanticAudit(job) {
    if (isOpenCoreEnabled() && !getLicenseClient().hasFeature('semantic_async')) {
        reportSemanticAuditSkipped('license', job.tenantId);
        return;
    }
    if (!isSemanticAsyncEnabled(job.tenantId))
        return;
    const budget = isTenantDailyBudgetExceeded(job.tenantId, getEstimatedSemanticCostUsd());
    if (budget.exceeded) {
        reportSemanticAuditSkipped('tenant_budget', job.tenantId);
        if (isLocalSemanticEnabled(job.tenantId)) {
            void runLocalSemanticAudit(job);
        }
        return;
    }
    if (!getLlm(job.tenantId).isAvailable() || !isSemanticLlmConfigured()) {
        if (isLocalSemanticEnabled(job.tenantId)) {
            void runLocalSemanticAudit(job);
            return;
        }
        reportSemanticAuditSkipped('no_api_key', job.tenantId);
        reportSemanticDegradation('llm_unavailable', {
            serverName: job.serverName,
            toolName: job.toolName,
        });
        return;
    }
    if (isSemanticCircuitOpen()) {
        reportSemanticAuditSkipped('circuit_open', job.tenantId);
        if (isLocalSemanticEnabled(job.tenantId)) {
            void runLocalSemanticAudit(job);
        }
        return;
    }
    if (queue.length >= MAX_QUEUE) {
        queue.shift();
        stats.dropped++;
        semanticAuditProcessed.inc({ ...getGuardianRegionLabels(), outcome: 'dropped' });
        Logger.warn('[async-semantic] Queue at capacity — dropped oldest audit job');
    }
    queue.push(job);
    semanticAuditQueued.inc(getGuardianRegionLabels());
    semanticAuditQueueDepth.set(queue.length);
    broadcastDashboardEvent({
        type: 'semantic:queued',
        serverName: job.serverName,
        payload: {
            requestId: job.requestId,
            toolName: job.toolName,
            syncRule: job.syncDecision.rule,
        },
        timestamp: Date.now(),
    });
    emitFlowStep({
        kind: 'semantic_queued',
        title: `Semantic audit queued: ${job.toolName}`,
        summary: `Async review after ${job.syncDecision.action} (${job.syncDecision.rule})`,
        severity: 'info',
        serverName: job.serverName,
        toolName: job.toolName,
        requestId: String(job.requestId),
    });
    if (debounceTimer)
        clearTimeout(debounceTimer);
    debounceTimer = setTimeout(() => {
        debounceTimer = null;
        void drainQueue();
    }, DEBOUNCE_MS);
}
async function drainQueue() {
    if (processing || queue.length === 0)
        return;
    processing = true;
    const batch = queue.splice(0, queue.length);
    semanticAuditQueueDepth.set(queue.length);
    try {
        for (const job of batch) {
            await runAudit(job);
        }
    }
    finally {
        processing = false;
        if (queue.length > 0) {
            debounceTimer = setTimeout(() => {
                debounceTimer = null;
                void drainQueue();
            }, DEBOUNCE_MS);
        }
    }
}
async function runLocalSemanticAudit(job) {
    const score = scoreLocalSemanticRisk({
        serverName: job.serverName,
        toolName: job.toolName,
        arguments: job.arguments,
        syncRule: job.syncDecision.rule,
        tenantId: job.tenantId,
    });
    stats.processed++;
    if (!score.suspicious) {
        semanticAuditProcessed.inc({ ...getGuardianRegionLabels(), outcome: 'local_clean' });
        return;
    }
    const minRisk = parseFloat(process.env['GUARDIAN_LOCAL_SEMANTIC_MIN_RISK'] || '0.55');
    if (score.risk < minRisk) {
        semanticAuditProcessed.inc({ ...getGuardianRegionLabels(), outcome: 'local_below_threshold' });
        return;
    }
    stats.flagged++;
    semanticAuditProcessed.inc({ ...getGuardianRegionLabels(), outcome: 'local_flagged' });
    StructuredLogger.info({
        event: 'local_semantic_flag',
        requestId: job.requestId,
        serverName: job.serverName,
        toolName: job.toolName,
        syncDecision: job.syncDecision,
        risk: score.risk,
        categories: score.categories,
        reasoning: score.reasoning,
        timestamp: job.timestamp,
        region: getGuardianRegionLabels().region,
    });
    const result = {
        suspicious: true,
        confidence: score.risk,
        categories: score.categories,
        reasoning: score.reasoning,
    };
    if (score.risk >= MIN_CONFIDENCE || shouldStoreCalibrationRecord()) {
        await persistSemanticAudit(job, result, { model: 'local-semantic' }).then((stored) => {
            if (!stored || score.risk < MIN_CONFIDENCE)
                return;
            setImmediate(() => {
                void import('./threat-research-pipeline.js').then(({ buildSemanticFlagEvent, enqueueThreatResearch }) => {
                    enqueueThreatResearch(buildSemanticFlagEvent(stored));
                });
            });
        });
    }
    broadcastSemanticComplete(job, result);
}
async function runAudit(job) {
    const allowed = await allowSemanticLlmCall(job.tenantId);
    if (!allowed) {
        reportSemanticAuditSkipped('rate_limited', job.tenantId);
        if (isLocalSemanticEnabled(job.tenantId)) {
            await runLocalSemanticAudit(job);
        }
        return;
    }
    const argsPreview = JSON.stringify(job.arguments ?? {}).slice(0, 2000);
    const systemPrompt = `You are an MCP security analyst. Classify whether a tools/call is suspicious AFTER sync policy passed.
Respond ONLY with JSON: {"suspicious":boolean,"confidence":0-1,"categories":string[],"reasoning":"one sentence"}
Categories: prompt-injection, exfiltration, privilege-escalation, encoded-payload, none.`;
    const userPrompt = `Server: ${job.serverName}\nTool: ${job.toolName}\nSync decision: ${job.syncDecision.action} (${job.syncDecision.rule})\nArguments: ${argsPreview}`;
    const llmCfg = getLlmConfig();
    const cache = getLlmCache();
    const cacheKey = semanticToLlmCacheKey({
        model: llmCfg.model,
        serverName: job.serverName,
        toolName: job.toolName,
        arguments: job.arguments,
        temperature: llmCfg.temperature,
        tenantId: job.tenantId,
        policyMode: job.syncDecision.action,
    }, systemPrompt, userPrompt);
    const cachedText = await cache.get(cacheKey);
    let response = null;
    if (cachedText) {
        response = {
            text: cachedText,
            model: llmCfg.model,
            tokensUsed: 0,
            durationMs: 0,
        };
    }
    else {
        try {
            response = await withSemanticTimeout('async_semantic_audit', () => getLlm(job.tenantId).generate(systemPrompt, userPrompt), null);
            if (response?.text) {
                recordSemanticLlmSuccess();
                recordTenantDailySpend(job.tenantId, getEstimatedSemanticCostUsd());
                await cache.set(cacheKey, response.text);
            }
            else {
                recordSemanticLlmFailure();
            }
        }
        catch (err) {
            recordSemanticLlmFailure(err);
            response = null;
        }
    }
    stats.processed++;
    if (!response) {
        semanticAuditProcessed.inc({ ...getGuardianRegionLabels(), outcome: 'no_llm' });
        reportSemanticAuditSkipped('llm_failed', job.tenantId);
        if (isLocalSemanticEnabled(job.tenantId)) {
            await runLocalSemanticAudit(job);
        }
        return;
    }
    let result;
    try {
        const parsed = JSON.parse(response.text);
        result = {
            suspicious: Boolean(parsed.suspicious),
            confidence: typeof parsed.confidence === 'number' ? parsed.confidence : 0,
            categories: Array.isArray(parsed.categories) ? parsed.categories : [],
            reasoning: String(parsed.reasoning || ''),
        };
    }
    catch {
        semanticAuditProcessed.inc({ ...getGuardianRegionLabels(), outcome: 'parse_error' });
        Logger.debug('[async-semantic] Failed to parse LLM JSON');
        return;
    }
    const flagged = result.suspicious && result.confidence >= MIN_CONFIDENCE;
    if (!flagged) {
        semanticAuditProcessed.inc({ ...getGuardianRegionLabels(), outcome: 'clean' });
        if (shouldStoreCalibrationRecord()) {
            await persistSemanticAudit(job, result, {
                model: response.model,
                durationMs: response.durationMs,
            });
        }
        return;
    }
    stats.flagged++;
    semanticAuditProcessed.inc({ ...getGuardianRegionLabels(), outcome: 'flagged' });
    StructuredLogger.info({
        event: 'async_semantic_flag',
        requestId: job.requestId,
        serverName: job.serverName,
        toolName: job.toolName,
        syncDecision: job.syncDecision,
        semanticAudit: result,
        model: response.model,
        durationMs: response.durationMs,
        timestamp: job.timestamp,
        region: getGuardianRegionLabels().region,
    });
    await persistSemanticAudit(job, result, {
        model: response.model,
        durationMs: response.durationMs,
    }).then((stored) => {
        if (!stored)
            return;
        setImmediate(() => {
            void import('./threat-research-pipeline.js').then(({ buildSemanticFlagEvent, enqueueThreatResearch }) => {
                enqueueThreatResearch(buildSemanticFlagEvent(stored));
            });
            if (result.suspicious) {
                void import('../alerting/soar-playbooks.js').then(({ runSoarPlaybooks }) => runSoarPlaybooks({
                    event: 'semantic_flag',
                    toolName: job.toolName,
                    serverName: job.serverName,
                    confidence: result.confidence,
                    categories: result.categories,
                    requestId: job.requestId,
                    id: stored.id,
                }));
            }
        });
    });
    broadcastSemanticComplete(job, result);
}
function broadcastSemanticComplete(job, result) {
    broadcastDashboardEvent({
        type: 'semantic:complete',
        serverName: job.serverName,
        payload: {
            requestId: job.requestId,
            toolName: job.toolName,
            suspicious: result.suspicious,
            confidence: result.confidence,
            categories: result.categories,
        },
        timestamp: Date.now(),
    });
    emitFlowStep({
        kind: 'semantic_complete',
        title: result.suspicious
            ? `Semantic flag: ${job.toolName}`
            : `Semantic clear: ${job.toolName}`,
        summary: result.reasoning || result.categories.join(', ') || 'No categories',
        severity: result.suspicious ? 'warn' : 'success',
        serverName: job.serverName,
        toolName: job.toolName,
        requestId: String(job.requestId),
        metadata: { confidence: result.confidence, categories: result.categories },
    });
}
/** Build job from proxy context after sync policy evaluation. */
export function buildSemanticAuditJob(ctx, syncDecision) {
    return {
        requestId: ctx.requestId ?? 'unknown',
        serverName: ctx.serverName,
        toolName: ctx.toolName,
        arguments: ctx.arguments,
        syncDecision,
        timestamp: ctx.timestamp ?? new Date().toISOString(),
        tenantId: ctx.tenantId,
    };
}
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