import { loadConfig } from "@nproxy/config";
import { createPrismaBillingStore, createPrismaWorkerStore, prisma } from "@nproxy/db";
import {
  createEmailTransport,
  createNanoBananaSimulatedAdapter,
  createPaymentProviderAdapter,
} from "@nproxy/providers";

const config = loadConfig();
const intervalMs = config.keyPool.balancePollSeconds * 1000;
const renewalLeadTimeHours = 72;
const invoiceReconciliationBatchSize = 100;
const workerStore = createPrismaWorkerStore(prisma, {
  cooldownMinutes: config.keyPool.cooldownMinutes,
  failuresBeforeManualReview: config.keyPool.failuresBeforeManualReview,
});
const billingStore = createPrismaBillingStore(prisma);
const nanoBananaAdapter = createNanoBananaSimulatedAdapter();
const paymentProviderAdapter = createPaymentProviderAdapter(config.payment);
const emailTransport = createEmailTransport(config.email);
let isTickRunning = false;

console.log(
  JSON.stringify({
    service: "worker",
    balancePollSeconds: config.keyPool.balancePollSeconds,
    renewalLeadTimeHours,
    providerModel: config.provider.nanoBananaDefaultModel,
  }),
);

setInterval(() => {
  void runTick();
}, intervalMs);

void runTick();

process.once("SIGTERM", async () => {
  await prisma.$disconnect();
  process.exit(0);
});

process.once("SIGINT", async () => {
  await prisma.$disconnect();
  process.exit(0);
});

async function runTick(): Promise<void> {
  if (isTickRunning) {
    console.log("worker tick skipped because previous tick is still running");
    return;
  }

  isTickRunning = true;

  try {
    const renewalNotifications = await billingStore.createUpcomingRenewalInvoices({
      paymentProvider: config.payment.provider,
      paymentProviderAdapter,
      renewalLeadTimeHours,
    });

    for (const notification of renewalNotifications) {
      const billingUrl = new URL("/billing", config.urls.appBaseUrl);
      await emailTransport.send({
        to: notification.email,
        subject: "Your nproxy subscription renewal invoice",
        text: [
          "Your current subscription period is ending soon.",
          `Current access ends at ${notification.subscriptionCurrentPeriodEnd.toISOString()}.`,
          `Invoice amount: ${notification.invoice.amountCrypto} ${notification.invoice.currency}.`,
          ...(notification.invoice.paymentAddress
            ? [`Payment address: ${notification.invoice.paymentAddress}.`]
            : []),
          ...(notification.invoice.expiresAt
            ? [`Invoice expires at ${notification.invoice.expiresAt.toISOString()}.`]
            : []),
          `Open billing: ${billingUrl.toString()}`,
        ].join("\n"),
      });
    }

    if (renewalNotifications.length > 0) {
      console.log(
        JSON.stringify({
          service: "worker",
          event: "renewal_invoices_created",
          createdCount: renewalNotifications.length,
        }),
      );
    }

    const pendingInvoices =
      await billingStore.listPendingInvoicesForReconciliation(invoiceReconciliationBatchSize);
    const reconciliationSummary = {
      polledCount: pendingInvoices.length,
      markedPaidCount: 0,
      markedExpiredCount: 0,
      markedCanceledCount: 0,
      alreadyTerminalCount: 0,
      ignoredCount: 0,
      failedCount: 0,
    };

    for (const invoice of pendingInvoices) {
      try {
        const providerInvoice = await paymentProviderAdapter.getInvoiceStatus(invoice.providerInvoiceId);

        if (providerInvoice.providerInvoiceId !== invoice.providerInvoiceId) {
          reconciliationSummary.failedCount += 1;
          console.error(
            JSON.stringify({
              service: "worker",
              event: "invoice_reconciliation_provider_mismatch",
              invoiceId: invoice.id,
              requestedProviderInvoiceId: invoice.providerInvoiceId,
              returnedProviderInvoiceId: providerInvoice.providerInvoiceId,
            }),
          );
          continue;
        }

        const result = await billingStore.reconcilePendingInvoice({
          invoiceId: invoice.id,
          providerStatus: providerInvoice.status,
          actor: {
            type: "system",
            ref: "invoice_reconciliation",
          },
          ...(providerInvoice.paidAt ? { paidAt: providerInvoice.paidAt } : {}),
        });

        switch (result.outcome) {
          case "marked_paid":
            reconciliationSummary.markedPaidCount += 1;
            break;
          case "marked_expired":
            reconciliationSummary.markedExpiredCount += 1;
            break;
          case "marked_canceled":
            reconciliationSummary.markedCanceledCount += 1;
            break;
          case "already_paid":
          case "already_expired":
          case "already_canceled":
            reconciliationSummary.alreadyTerminalCount += 1;
            break;
          case "ignored_terminal_state":
            reconciliationSummary.ignoredCount += 1;
            break;
          case "noop_pending":
            break;
        }
      } catch (error) {
        reconciliationSummary.failedCount += 1;
        console.error(
          JSON.stringify({
            service: "worker",
            event: "invoice_reconciliation_failed",
            invoiceId: invoice.id,
            providerInvoiceId: invoice.providerInvoiceId,
            error: error instanceof Error ? error.message : String(error),
          }),
        );
      }
    }

    if (
      reconciliationSummary.polledCount > 0 ||
      reconciliationSummary.failedCount > 0 ||
      reconciliationSummary.markedPaidCount > 0 ||
      reconciliationSummary.markedExpiredCount > 0 ||
      reconciliationSummary.markedCanceledCount > 0 ||
      reconciliationSummary.alreadyTerminalCount > 0 ||
      reconciliationSummary.ignoredCount > 0
    ) {
      console.log(
        JSON.stringify({
          service: "worker",
          event: "pending_invoice_reconciliation",
          ...reconciliationSummary,
        }),
      );
    }

    const expiredInvoices = await billingStore.expireElapsedPendingInvoices();

    if (expiredInvoices.expiredCount > 0) {
      console.log(
        JSON.stringify({
          service: "worker",
          event: "pending_invoices_expired",
          expiredCount: expiredInvoices.expiredCount,
        }),
      );
    }

    const recovery = await workerStore.recoverCooldownProviderKeys();

    if (recovery.recoveredCount > 0) {
      console.log(
        JSON.stringify({
          service: "worker",
          event: "cooldown_keys_recovered",
          recoveredCount: recovery.recoveredCount,
        }),
      );
    }

    const job = await workerStore.claimNextQueuedGenerationJob();

    if (!job) {
      console.log(`worker heartbeat interval=${intervalMs} no_queued_jobs=true`);
      return;
    }

    const result = await workerStore.processClaimedGenerationJob(
      job,
      async (request, providerKey) => {
        if (providerKey.providerCode !== config.provider.nanoBananaDefaultModel) {
          return {
            ok: false as const,
            usedProxy: false,
            directFallbackUsed: false,
            failureKind: "unknown" as const,
            providerErrorCode: "unsupported_provider_model",
            providerErrorText: `Unsupported provider model: ${providerKey.providerCode}`,
          };
        }

        if (providerKey.proxyBaseUrl) {
          const proxyResult = await nanoBananaAdapter.executeGeneration({
            request,
            providerKey: {
              id: providerKey.id,
              providerCode: providerKey.providerCode,
              label: providerKey.label,
              apiKeyLastFour: providerKey.apiKeyLastFour,
            },
            route: {
              kind: "proxy",
              proxyBaseUrl: providerKey.proxyBaseUrl,
            },
          });

          if (!proxyResult.ok && proxyResult.failureKind === "transport") {
            const directResult = await nanoBananaAdapter.executeGeneration({
              request,
              providerKey: {
                id: providerKey.id,
                providerCode: providerKey.providerCode,
                label: providerKey.label,
                apiKeyLastFour: providerKey.apiKeyLastFour,
              },
              route: {
                kind: "direct",
              },
            });

            return {
              ...directResult,
              usedProxy: true,
              directFallbackUsed: true,
            };
          }

          return {
            ...proxyResult,
            usedProxy: true,
            directFallbackUsed: false,
          };
        }

        const directResult = await nanoBananaAdapter.executeGeneration({
          request,
          providerKey: {
            id: providerKey.id,
            providerCode: providerKey.providerCode,
            label: providerKey.label,
            apiKeyLastFour: providerKey.apiKeyLastFour,
          },
          route: {
            kind: "direct",
          },
        });

        return {
          ...directResult,
          usedProxy: false,
          directFallbackUsed: false,
        };
      },
    );

    console.log(JSON.stringify({ service: "worker", event: "job_processed", ...result }));
  } catch (error) {
    console.error("worker tick failed", error);
  } finally {
    isTickRunning = false;
  }
}