import { access, rm } from "node:fs/promises";
import { join } from "node:path";
import { getPrismaClient, withTenantContext } from "@b2bcall/database";
import { getObjectStorageProvider, buildRecordingObjectKey } from "@b2bcall/storage";
import { createLogger } from "@b2bcall/shared";
import { enqueueTranscriptionJobIfEligible } from "./ai-trigger";

const logger = createLogger("b2bcall-fs-events");

const SPOOL_DIR = process.env.RECORDINGS_SPOOL_DIR ?? "/recordings";
const STORAGE_KIND = (process.env.STORAGE_PROVIDER ?? "local").toUpperCase() as "LOCAL" | "S3";

function sleep(ms: number): Promise<void> {
  return new Promise((resolve) => setTimeout(resolve, ms));
}

async function fileExists(path: string): Promise<boolean> {
  try {
    await access(path);
    return true;
  } catch {
    return false;
  }
}

/**
 * Sobe pro object storage a gravação de uma chamada que acabou de
 * terminar (agente.md secao 90-93) — chamado a partir de CALL_ENDED em
 * main.ts, sempre depois do CDR já ter persistido `Call` (precisa de
 * `Call.createdAt`/`talkTime` pra `recordedAt`/`durationSeconds`).
 *
 * `originateSimulatedAnswerLeg`/`originateRealPstnLeg`
 * (apps/predictive-dialer) só setam `execute_on_answer='record_session
 * ...'` quando `Campaign.recordingEnabled` é true — pra qualquer outra
 * chamada, o arquivo simplesmente não existe, e essa função não faz nada
 * (checagem por existência de arquivo, não por reconsultar a campanha).
 */
export async function uploadRecordingIfPresent(tenantId: string, callId: string): Promise<void> {
  const spoolPath = join(SPOOL_DIR, `${callId}.wav`);

  // record_session termina de gravar no CHANNEL_HANGUP_COMPLETE, mas pode
  // levar um instante pra flush terminar — tenta algumas vezes antes de
  // desistir, em vez de perder a gravação por uma corrida.
  let exists = await fileExists(spoolPath);
  for (let attempt = 0; !exists && attempt < 5; attempt++) {
    await sleep(300);
    exists = await fileExists(spoolPath);
  }
  if (!exists) return;

  const prisma = getPrismaClient();

  try {
    const call = await withTenantContext(prisma, tenantId, (tx) => tx.call.findUniqueOrThrow({ where: { id: callId } }));
    const tenant = await prisma.tenant.findUniqueOrThrow({ where: { id: tenantId }, include: { plan: true } });

    const recordedAt = call.createdAt;
    const objectKey = buildRecordingObjectKey(tenantId, callId, recordedAt);
    const storage = getObjectStorageProvider();
    const { sizeBytes, checksum } = await storage.putObject(objectKey, spoolPath);

    const retentionDays = tenant.plan.recordingRetentionDays;
    const retentionUntil = retentionDays
      ? new Date(recordedAt.getTime() + retentionDays * 24 * 60 * 60 * 1000)
      : null;

    await withTenantContext(prisma, tenantId, (tx) =>
      tx.recording.create({
        data: {
          tenantId,
          callId,
          storageProvider: STORAGE_KIND,
          objectKey,
          format: "wav",
          durationSeconds: call.talkTime ?? call.durationSeconds,
          channels: 2,
          sizeBytes,
          checksum,
          recordedAt,
          retentionUntil,
        },
      }),
    );

    await rm(spoolPath, { force: true });
    logger.info("gravacao enviada pro object storage", { callId, objectKey, sizeBytes });

    await enqueueTranscriptionJobIfEligible(tenantId, callId, tenant, call.queueId, call.campaignId);
  } catch (err) {
    logger.error("falha ao processar gravacao", { error: String(err), callId });
    await withTenantContext(prisma, tenantId, (tx) =>
      tx.recording
        .create({
          data: {
            tenantId,
            callId,
            storageProvider: STORAGE_KIND,
            objectKey: "",
            recordedAt: new Date(),
            status: "FAILED",
          },
        })
        .catch(() => undefined),
    );
  }
}