import cron from 'node-cron';
import path from 'path';
import { logger } from '../../utils/logger.js';
import { getNeo4jVectorStore } from '../../platform/vector/Neo4jVectorStoreAdapter.js';
import { OutlookEmailReader } from './OutlookEmailReader.js';
import { PublicThreatScraper } from './PublicThreatScraper.js';
import { InternalLeakHunter } from './InternalLeakHunter.js';
import { NewsMonitorScraper } from './NewsMonitorScraper.js';
import { LocalFileScanner } from './LocalFileScanner.js';
import { eventBus } from '../../mcp/EventBus.js';

type Telemetry = {
  lastRun?: string;
  lastError?: string;
  runs: number;
};

export class DataScheduler {
  private isRunning = false;
  private tasks: cron.ScheduledTask[] = [];
  private telemetry: Record<string, Telemetry> = {};

  start() {
    if (this.isRunning) return;
    this.isRunning = true;
    logger.info('✅ DataScheduler started');

    this.scheduleEmailIngestion();
    this.scheduleThreatIntel();
    this.scheduleInternalHunt();
    this.scheduleNewsMonitor();
    this.scheduleSystemHealth();
    this.scheduleLocalFiles();
  }

  stop() {
    this.tasks.forEach((t) => t.stop());
    this.isRunning = false;
    logger.info('🛑 DataScheduler stopped');
  }

  public getStatus() {
    return {
      running: this.isRunning,
      tasks: Object.entries(this.telemetry).map(([name, info]) => ({
        name,
        lastRun: info.lastRun || null,
        lastError: info.lastError || null,
        runs: info.runs,
      })),
    };
  }

  private markRun(name: string, error?: unknown) {
    if (!this.telemetry[name]) {
      this.telemetry[name] = { runs: 0 };
    }
    const entry = this.telemetry[name];
    entry.lastRun = new Date().toISOString();
    entry.runs += 1;
    entry.lastError = error ? (error as any)?.message || String(error) : undefined;
  }

  private scheduleLocalFiles() {
    const scanPath = path.resolve('data/ingestion');
    const scanner = new LocalFileScanner({
      rootPaths: [scanPath],
      extensions: ['.pdf', '.txt', '.md'],
    });

    const task = cron.schedule('*/30 * * * *', async () => {
      const taskName = 'local_files';
      logger.info(`📁 Scanning local files in ${scanPath}...`);
      try {
        if (await scanner.isAvailable()) {
          const files = await scanner.fetch();
          const entities = await scanner.transform(files);

          if (entities.length > 0) {
            const vectorStore = getNeo4jVectorStore();
            await vectorStore.batchUpsert({
              records: entities.map((entity) => ({
                id: entity.id,
                content: entity.content,
                metadata: {
                  ...entity.metadata,
                  type: 'document',
                  source: 'local_ingestion',
                },
                namespace: 'documents',
              })),
              namespace: 'documents',
            });

            logger.info(`📨 Ingested ${entities.length} local documents`);
            eventBus.emit('ingestion:documents', { count: entities.length });
          }
          this.markRun(taskName);
        } else {
          logger.warn(`Local ingestion path not accessible: ${scanPath}`);
          this.markRun(taskName, new Error('path not accessible'));
        }
      } catch (error) {
        logger.error('Local file scan failed:', error);
        this.markRun(taskName, error);
      }
    });
    this.tasks.push(task);

    setTimeout(async () => {
      const taskName = 'local_files_initial';
      logger.info('📁 Running initial local file scan...');
      try {
        if (await scanner.isAvailable()) {
          const files = await scanner.fetch();
          const entities = await scanner.transform(files);
          if (entities.length > 0) {
            const vectorStore = getNeo4jVectorStore();
            await vectorStore.batchUpsert({
              records: entities.map((entity) => ({
                id: entity.id,
                content: entity.content,
                metadata: {
                  ...entity.metadata,
                  type: 'document',
                  source: 'local_ingestion',
                },
                namespace: 'documents',
              })),
              namespace: 'documents',
            });
            logger.info(`📨 Ingested ${entities.length} local documents (initial)`);
          }
          this.markRun(taskName);
        }
      } catch (e) {
        logger.error('Initial local scan failed:', e);
        this.markRun(taskName, e);
      }
    }, 15000);
  }

  private scheduleEmailIngestion() {
    const task = cron.schedule('*/5 * * * *', async () => {
      const taskName = 'emails';
      logger.info('📧 Running scheduled email ingestion...');
      try {
        const reader = new OutlookEmailReader();
        const emails = await reader.readData();

        if (emails.length > 0) {
          const vectorStore = getNeo4jVectorStore();
          for (const email of emails) {
            await vectorStore.upsert({
              id: `email-${email.id}`,
              content: `Subject: ${email.subject}\nFrom: ${email.sender}\n\n${email.content}`,
              metadata: {
                type: 'email',
                source: 'outlook',
                sender: email.sender,
                receivedAt: email.timestamp,
                ...email.metadata,
              },
              namespace: 'emails',
            });
          }
          logger.info(`✅ Ingested ${emails.length} emails to vector store`);
          eventBus.emit('ingestion:emails', { count: emails.length });
        } else {
          logger.debug('No new emails found');
        }
        this.markRun(taskName);
      } catch (error) {
        if ((error as any).message?.includes('Mangler IMAP credentials')) {
          logger.debug('Skipping email ingestion (no credentials)');
        } else {
          logger.error('❌ Email ingestion failed:', error);
        }
        this.markRun(taskName, error);
      }
    });
    this.tasks.push(task);
  }

  private scheduleThreatIntel() {
    const scraper = new PublicThreatScraper();
    const task = cron.schedule('*/15 * * * *', async () => {
      const taskName = 'threat_intel';
      logger.info('🌐 Running public threat intelligence scan...');
      try {
        const threats = await scraper.fetchThreats();
        if (threats.length > 0) {
          eventBus.emit('threat:detected', { threats });
          logger.info(`✅ Broadcasted ${threats.length} threats to UI`);
        }
        this.markRun(taskName);
      } catch (error) {
        logger.error('Threat scan failed:', error);
        this.markRun(taskName, error);
      }
    });
    this.tasks.push(task);
  }

  private scheduleInternalHunt() {
    const hunter = new InternalLeakHunter();
    const task = cron.schedule('*/10 * * * *', async () => {
      const taskName = 'internal_hunt';
      try {
        await hunter.hunt();
        this.markRun(taskName);
      } catch (error) {
        logger.error('Internal hunt failed:', error);
        this.markRun(taskName, error);
      }
    });
    this.tasks.push(task);
  }

  private scheduleNewsMonitor() {
    const scraper = new NewsMonitorScraper();
    const task = cron.schedule('0 * * * *', async () => {
      const taskName = 'news_monitor';
      logger.info('📰 Running news monitor scan...');
      try {
        const news = await scraper.fetchNews();
        if (news.length > 0) {
          const vectorStore = getNeo4jVectorStore();
          await vectorStore.batchUpsert({
            records: news.map((item) => ({
              id: item.id,
              content: `${item.title}\n${item.snippet}\nSource: ${item.source}\nCategory: ${item.category}`,
              metadata: {
                ...item,
                type: 'news',
                ingestedAt: new Date().toISOString(),
              },
              namespace: 'news',
            })),
            namespace: 'news',
          });

          logger.info(`✅ Ingested ${news.length} news items`);
          eventBus.emit('ingestion:news', { count: news.length, items: news });
        }
        this.markRun(taskName);
      } catch (error) {
        logger.error('News monitor failed:', error);
        this.markRun(taskName, error);
      }
    });
    this.tasks.push(task);

    setTimeout(() => {
      const taskName = 'news_monitor_initial';
      logger.info('📰 Running initial news scan...');
      scraper
        .fetchNews()
        .then((news) => {
          if (news.length > 0) {
            eventBus.emit('ingestion:news', { count: news.length, items: news });
          }
          this.markRun(taskName);
        })
        .catch((err) => {
          logger.error('Initial news scan failed:', err);
          this.markRun(taskName, err);
        });
    }, 10000);
  }

  private scheduleSystemHealth() {
    const task = cron.schedule('* * * * *', async () => {
      const taskName = 'system_heartbeat';
      eventBus.emit('system:heartbeat', {
        timestamp: new Date().toISOString(),
        status: 'healthy',
        memory: process.memoryUsage(),
      });
      this.markRun(taskName);
    });
    this.tasks.push(task);
  }
}

export const dataScheduler = new DataScheduler();