/**
 * Cache management routes
 * 
 * Provides endpoints for cache status and manual sync triggers.
 */

import { Router, Request, Response } from 'express';
import { cacheStore } from '../services/cacheStore.js';
import { syncEngine } from '../services/syncEngine.js';
import { logger } from '../services/logger.js';
import { OBJECT_TYPES } from '../generated/jira-schema.js';
import type { CMDBObjectTypeName } from '../generated/jira-types.js';

const router = Router();

// Get cache status
router.get('/status', async (req: Request, res: Response) => {
  try {
    const cacheStats = await cacheStore.getStats();
    const syncStatus = await syncEngine.getStatus();
    
    // Compare cache count with Jira count for ApplicationComponent
    let jiraComparison: { jiraCount?: number; cacheCount: number; difference?: number } | undefined;
    if (cacheStats.objectsByType['ApplicationComponent'] !== undefined) {
      try {
        const { jiraAssetsClient } = await import('../services/jiraAssetsClient.js');
        const { OBJECT_TYPES } = await import('../generated/jira-schema.js');
        const typeDef = OBJECT_TYPES['ApplicationComponent'];
        if (typeDef) {
          const searchResult = await jiraAssetsClient.searchObjects(`objectType = "${typeDef.name}"`, 1, 1);
          const jiraCount = searchResult.totalCount;
          const cacheCount = cacheStats.objectsByType['ApplicationComponent'] || 0;
          jiraComparison = {
            jiraCount,
            cacheCount,
            difference: jiraCount - cacheCount,
          };
        }
      } catch (err) {
        logger.debug('Could not fetch Jira count for comparison', err);
      }
    }
    
    res.json({
      cache: cacheStats,
      sync: syncStatus,
      supportedTypes: Object.keys(OBJECT_TYPES),
      jiraComparison,
    });
  } catch (error) {
    logger.error('Failed to get cache status', error);
    res.status(500).json({ error: 'Failed to get cache status' });
  }
});

// Trigger full sync
router.post('/sync', async (req: Request, res: Response) => {
  try {
    logger.info('Manual full sync triggered');
    
    // Don't wait for completion - return immediately
    syncEngine.fullSync().catch(err => {
      logger.error('Full sync failed', err);
    });
    
    res.json({
      status: 'started',
      message: 'Full sync started in background',
    });
  } catch (error) {
    logger.error('Failed to trigger full sync', error);
    res.status(500).json({ error: 'Failed to trigger sync' });
  }
});

// Trigger sync for a specific object type
router.post('/sync/:objectType', async (req: Request, res: Response) => {
  try {
    const { objectType } = req.params;
    
    // Validate object type
    if (!OBJECT_TYPES[objectType]) {
      res.status(400).json({ 
        error: `Unknown object type: ${objectType}`,
        supportedTypes: Object.keys(OBJECT_TYPES),
      });
      return;
    }
    
    logger.info(`Manual sync triggered for ${objectType}`);
    
    const result = await syncEngine.syncType(objectType as CMDBObjectTypeName);
    
    res.json({
      status: 'completed',
      objectType,
      stats: result,
    });
  } catch (error) {
    const errorMessage = error instanceof Error ? error.message : 'Failed to sync object type';
    logger.error(`Failed to sync object type ${req.params.objectType}`, error);
    
    // Return 409 (Conflict) if sync is already in progress, otherwise 500
    const statusCode = errorMessage.includes('already in progress') ? 409 : 500;
    res.status(statusCode).json({ 
      error: errorMessage,
      objectType: req.params.objectType,
    });
  }
});

// Clear cache for a specific type
router.delete('/clear/:objectType', async (req: Request, res: Response) => {
  try {
    const { objectType } = req.params;
    
    if (!OBJECT_TYPES[objectType]) {
      res.status(400).json({ 
        error: `Unknown object type: ${objectType}`,
        supportedTypes: Object.keys(OBJECT_TYPES),
      });
      return;
    }
    
    logger.info(`Clearing cache for ${objectType}`);
    
    const deleted = await cacheStore.clearObjectType(objectType as CMDBObjectTypeName);
    
    res.json({
      status: 'cleared',
      objectType,
      deletedCount: deleted,
    });
  } catch (error) {
    logger.error(`Failed to clear cache for ${req.params.objectType}`, error);
    res.status(500).json({ error: 'Failed to clear cache' });
  }
});

// Clear entire cache
router.delete('/clear', async (req: Request, res: Response) => {
  try {
    logger.info('Clearing entire cache');
    
    await cacheStore.clearAll();
    
    res.json({
      status: 'cleared',
      message: 'Entire cache cleared',
    });
  } catch (error) {
    logger.error('Failed to clear cache', error);
    res.status(500).json({ error: 'Failed to clear cache' });
  }
});

export default router;