/**
 * QBO Sync API
 * POST /api/qbo/sync — trigger a full or incremental sync
 * GET  /api/qbo/sync — get last sync status and record counts
 */

import { NextRequest, NextResponse } from 'next/server';
import { QboSyncService } from '@/lib/services/qbo-sync-service';
import { QboClient } from '@/lib/services/qbo-client';
import postgresClient from '@/lib/services/postgres-client';

export async function POST(request: NextRequest) {
  try {
    const body = await request.json().catch(() => ({}));
    const syncType: 'full' | 'incremental' = body.syncType === 'incremental' ? 'incremental' : 'full';
    const triggeredBy = body.triggeredBy || 'api';

    const client = new QboClient();
    const service = new QboSyncService(client);

    if (service.isSyncInProgress()) {
      return NextResponse.json({ error: 'QBO sync already in progress' }, { status: 409 });
    }

    // Run async — return immediately
    service[syncType === 'full' ? 'fullSync' : 'incrementalSync'](triggeredBy).catch((err) => {
      console.error('[QBO Sync API] Sync failed:', err);
    });

    return NextResponse.json({
      message: `QBO ${syncType} sync started`,
      triggeredBy,
    });
  } catch (err) {
    const msg = err instanceof Error ? err.message : String(err);
    return NextResponse.json({ error: msg }, { status: 500 });
  }
}

export async function GET() {
  try {
    const [invoices, payments, deposits, transactions, reports] = await Promise.all([
      postgresClient.query(`SELECT COUNT(*) as count, MAX(synced_at) as last_sync FROM qbo_invoices`),
      postgresClient.query(`SELECT COUNT(*) as count, MAX(synced_at) as last_sync FROM qbo_payments`),
      postgresClient.query(`SELECT COUNT(*) as count, MAX(synced_at) as last_sync FROM qbo_deposits`),
      postgresClient.query(`SELECT COUNT(*) as count, MAX(synced_at) as last_sync FROM qbo_transactions`),
      postgresClient.query(`SELECT COUNT(*) as count, MAX(synced_at) as last_sync FROM qbo_reports`),
    ]);

    // Check token status
    let tokenStatus: 'valid' | 'expired' | 'missing' = 'missing';
    try {
      const client = new QboClient();
      const token = await client.loadToken();
      if (token) {
        tokenStatus = new Date() < new Date(token.access_token_expires_at) ? 'valid' : 'expired';
      }
    } catch {
      tokenStatus = 'missing';
    }

    return NextResponse.json({
      tokenStatus,
      counts: {
        invoices: parseInt(invoices.rows[0]?.count || '0'),
        payments: parseInt(payments.rows[0]?.count || '0'),
        deposits: parseInt(deposits.rows[0]?.count || '0'),
        transactions: parseInt(transactions.rows[0]?.count || '0'),
        reports: parseInt(reports.rows[0]?.count || '0'),
      },
      lastSync: {
        invoices: invoices.rows[0]?.last_sync ?? null,
        payments: payments.rows[0]?.last_sync ?? null,
        deposits: deposits.rows[0]?.last_sync ?? null,
        transactions: transactions.rows[0]?.last_sync ?? null,
        reports: reports.rows[0]?.last_sync ?? null,
      },
    });
  } catch (err) {
    const msg = err instanceof Error ? err.message : String(err);
    return NextResponse.json({ error: msg }, { status: 500 });
  }
}