import { Router } from 'express';
import { schemaCacheService } from '../services/schemaCacheService.js';
import { schemaSyncService } from '../services/SchemaSyncService.js';
import { schemaMappingService } from '../services/schemaMappingService.js';
import { logger } from '../services/logger.js';
import { jiraAssetsClient } from '../services/jiraAssetsClient.js';
import { requireAuth, requirePermission } from '../middleware/authorization.js';

const router = Router();

// All routes require authentication and search permission
router.use(requireAuth);
router.use(requirePermission('search'));

/**
 * GET /api/schema
 * Returns the complete Jira Assets schema with object types, attributes, and links
 * Data is fetched from database (via cache service)
 */
router.get('/', async (req, res) => {
  try {
    // Get schema from cache (which fetches from database)
    const schema = await schemaCacheService.getSchema();
    
    // Optionally fetch Jira counts for comparison (can be slow, so make it optional)
    let jiraCounts: Record<string, number> | undefined;
    const includeJiraCounts = req.query.includeJiraCounts === 'true';
    
    if (includeJiraCounts) {
      const typeNames = Object.keys(schema.objectTypes);
      logger.info(`Schema: Fetching object counts from Jira Assets for ${typeNames.length} object types...`);
      
      jiraCounts = {};
      // Fetch counts in parallel for better performance, using schema mappings
      const countPromises = typeNames.map(async (typeName) => {
        try {
          // Get schema ID for this type
          const schemaId = await schemaMappingService.getSchemaId(typeName);
          const count = await jiraAssetsClient.getObjectCount(typeName, schemaId);
          jiraCounts![typeName] = count;
          return { typeName, count };
        } catch (error) {
          logger.warn(`Schema: Failed to get count for ${typeName}`, error);
          // Use 0 as fallback if API call fails
          jiraCounts![typeName] = 0;
          return { typeName, count: 0 };
        }
      });
      
      await Promise.all(countPromises);
      logger.info(`Schema: Fetched counts for ${Object.keys(jiraCounts).length} object types from Jira Assets`);
    }
    
    const response = {
      ...schema,
      jiraCounts,
    };
    
    res.json(response);
  } catch (error) {
    logger.error('Failed to get schema:', error);
    res.status(500).json({ error: 'Failed to get schema' });
  }
});

/**
 * GET /api/schema/object-type/:typeName
 * Returns details for a specific object type
 */
router.get('/object-type/:typeName', async (req, res) => {
  try {
    const { typeName } = req.params;
    
    // Get schema from cache
    const schema = await schemaCacheService.getSchema();
    const typeDef = schema.objectTypes[typeName];
    
    if (!typeDef) {
      return res.status(404).json({ error: `Object type '${typeName}' not found` });
    }
    
    res.json(typeDef);
  } catch (error) {
    logger.error('Failed to get object type:', error);
    res.status(500).json({ error: 'Failed to get object type' });
  }
});

/**
 * POST /api/schema/discover
 * Manually trigger schema synchronization from Jira API
 * Requires manage_settings permission
 */
router.post('/discover', requirePermission('manage_settings'), async (req, res) => {
  try {
    logger.info('Schema: Manual schema sync triggered');
    const result = await schemaSyncService.syncAll();
    schemaCacheService.invalidate(); // Invalidate cache
    
    res.json({ 
      message: 'Schema synchronization completed',
      ...result,
    });
  } catch (error) {
    logger.error('Failed to sync schema:', error);
    res.status(500).json({ 
      error: 'Failed to sync schema',
      details: error instanceof Error ? error.message : String(error),
    });
  }
});

/**
 * GET /api/schema/sync-progress
 * Get current sync progress
 */
router.get('/sync-progress', requirePermission('manage_settings'), async (req, res) => {
  try {
    const progress = schemaSyncService.getProgress();
    res.json(progress);
  } catch (error) {
    logger.error('Failed to get sync progress:', error);
    res.status(500).json({ error: 'Failed to get sync progress' });
  }
});

export default router;