import { prisma } from '@shieldai/db';
import { Queue, Worker, Job } from 'bullmq';
import { Redis } from 'ioredis';
import { reportService } from '@shieldai/report';

const redisHost = process.env.REDIS_HOST || 'localhost';
const redisPort = parseInt(process.env.REDIS_PORT || '6379', 10);

const connection = new Redis({
  host: redisHost,
  port: redisPort,
  retryStrategy: (times: number) => Math.min(times * 50, 2000),
});

const QUEUE_CONFIG = {
  reportGeneration: {
    name: 'report-generation',
    concurrency: parseInt(process.env.REPORT_CONCURRENCY || '3', 10),
    defaultJobTimeout: parseInt(process.env.REPORT_JOB_TIMEOUT || '30000', 10),
    maxAttempts: parseInt(process.env.REPORT_MAX_ATTEMPTS || '2', 10),
  },
  reportScheduler: {
    name: 'report-scheduler',
    concurrency: 1,
  },
};

export const reportGenerationQueue = new Queue(
  QUEUE_CONFIG.reportGeneration.name,
  { connection }
);

export const reportSchedulerQueue = new Queue(
  QUEUE_CONFIG.reportScheduler.name,
  { connection }
);

async function processReportGeneration(
  job: Job<{
    reportId: string;
    userId: string;
    subscriptionId: string;
    reportType: string;
    periodStart?: string;
    periodEnd?: string;
    notifyEmail?: string;
  }>
) {
  const { reportId, userId, subscriptionId, reportType, periodStart, periodEnd, notifyEmail } = job.data;

  job.updateProgress(10);
  console.log(`[Report:Generate] Starting report ${reportId} for user ${userId}`);

  try {
    const report = await reportService.generateReport({
      userId,
      subscriptionId,
      reportType,
      periodStart: periodStart ? new Date(periodStart) : undefined,
      periodEnd: periodEnd ? new Date(periodEnd) : undefined,
    });

    job.updateProgress(80);

    if (notifyEmail && report.status === 'COMPLETED') {
      const { EmailService } = await import('@shieldai/shared-notifications');
      const emailService = EmailService.getInstance();

      const dashboardUrl = process.env.DASHBOARD_URL || 'https://app.shieldai.com';

      const user = await prisma.user.findUnique({
        where: { id: userId },
        select: { name: true, email: true },
      });

      const userName = user?.name || notifyEmail.split('@')[0];

      await emailService.sendWithTemplate(notifyEmail, {
        templateId: 'report_ready',
        variables: {
          name: userName,
          report_title: report.title,
          report_summary: report.summary || 'Your protection report contains detailed statistics and recommendations.',
          report_url: `${dashboardUrl}/reports/${report.id}`,
          pdf_url: report.pdfUrl || `${dashboardUrl}/api/v1/reports/${report.id}/pdf`,
        },
      });

      await prisma.securityReport.update({
        where: { id: report.id },
        data: {
          status: 'DELIVERED',
          deliveredAt: new Date(),
        },
      });

      job.updateProgress(95);
    }

    job.updateProgress(100);

    return {
      status: report.status,
      reportId: report.id,
      title: report.title,
    };
  } catch (error) {
    const message = error instanceof Error ? error.message : 'Report generation failed';
    console.error(`[Report:Generate] Job ${job.id} failed:`, message);

    await prisma.securityReport.update({
      where: { id: reportId },
      data: {
        status: 'FAILED',
        error: message,
      },
    });

    job.updateProgress(100);
    throw new Error(message);
  }
}

async function processReportScheduler(job: Job) {
  console.log('[Report:Scheduler] Running scheduled report check');

  try {
    const pendingReports = await prisma.securityReport.findMany({
      where: {
        status: 'PENDING',
        scheduledFor: {
          lte: new Date(),
        },
      },
      include: {
        user: { select: { email: true } },
      },
    });

    const results: Array<{ reportId: string; queued: boolean }> = [];

    for (const report of pendingReports) {
      try {
        await reportGenerationQueue.add('generate-report', {
          reportId: report.id,
          userId: report.userId,
          subscriptionId: report.subscriptionId,
          reportType: report.reportType,
          periodStart: report.periodStart.toISOString(),
          periodEnd: report.periodEnd.toISOString(),
          notifyEmail: report.user?.email,
        }, {
          attempts: QUEUE_CONFIG.reportGeneration.maxAttempts,
          backoff: { type: 'exponential', delay: 5000 },
          jobId: `report-gen-${report.id}`,
        });

        results.push({ reportId: report.id, queued: true });
      } catch (err) {
        console.error(`[Report:Scheduler] Failed to queue report ${report.id}:`, err);
        results.push({ reportId: report.id, queued: false });
      }
    }

    return { processed: results.length, completedAt: new Date().toISOString() };
  } catch (error) {
    console.error('[Report:Scheduler] Error:', error);
    throw error;
  }
}

export const reportGenerationWorker = new Worker(
  QUEUE_CONFIG.reportGeneration.name,
  processReportGeneration,
  {
    connection,
    concurrency: QUEUE_CONFIG.reportGeneration.concurrency,
    removeOnComplete: {
      age: 7 * 24 * 60 * 60,
      count: 500,
    },
    removeOnFail: {
      age: 30 * 24 * 60 * 60,
      count: 100,
    },
  }
);

export const reportSchedulerWorker = new Worker(
  QUEUE_CONFIG.reportScheduler.name,
  processReportScheduler,
  {
    connection,
    concurrency: QUEUE_CONFIG.reportScheduler.concurrency,
  }
);

reportGenerationWorker.on('completed', (job, result) => {
  console.log(`[Report:Generate] Job ${job.id} completed:`, result);
});

reportGenerationWorker.on('failed', (job, err) => {
  console.error(`[Report:Generate] Job ${job?.id} failed:`, err.message);
});

reportGenerationWorker.on('error', (err) => {
  console.error('[Report:Generate] Worker error:', err.message);
});

reportSchedulerWorker.on('completed', (job, result) => {
  console.log(`[Report:Scheduler] Job ${job.id} completed:`, result);
});

reportSchedulerWorker.on('failed', (job, err) => {
  console.error(`[Report:Scheduler] Job ${job?.id} failed:`, err.message);
});

export async function queueReportGeneration(data: {
  reportId: string;
  userId: string;
  subscriptionId: string;
  reportType: string;
  periodStart?: string;
  periodEnd?: string;
  notifyEmail?: string;
}) {
  return reportGenerationQueue.add('generate-report', data, {
    attempts: QUEUE_CONFIG.reportGeneration.maxAttempts,
    backoff: { type: 'exponential', delay: 5000 },
    jobId: `report-gen-${data.reportId}-${Date.now()}`,
  });
}

export async function scheduleReportProcessor() {
  return reportSchedulerQueue.add('check-pending-reports', {}, {
    repeat: { pattern: '0 */6 * * *' },
    jobId: 'report-scheduler-recurring',
  });
}

export async function scheduleMonthlyReportTrigger() {
  return reportSchedulerQueue.add('trigger-monthly-reports', {}, {
    repeat: { pattern: '0 0 1 * *' },
    jobId: 'monthly-report-trigger',
  });
}

export async function scheduleAnnualReportTrigger() {
  return reportSchedulerQueue.add('trigger-annual-reports', {}, {
    repeat: { pattern: '0 0 1 1 *' },
    jobId: 'annual-report-trigger',
  });
}

export default {
  reportGenerationQueue,
  reportGenerationWorker,
  reportSchedulerQueue,
  reportSchedulerWorker,
};