import { Router } from 'express';
import { authRequired } from '../../Application/Services/AuthMiddleware';
import { container } from '../../Application/Services/DIContainer';
import { ErrorResponseService } from '../../Application/Services/ErrorResponseService';
import { ValidationMiddleware } from '../../Application/Services/ValidationMiddleware';
import { GeneralSearchService } from '../../Application/Search/Generalsearch';
import { logRequest, logError, logWarning } from '../../Application/Services/Logger';

const deckRouter = Router();

// Create search service that isn't in the container yet
const searchService = new GeneralSearchService(container.userRepository, container.organizationRepository, container.deckRepository);

// Authenticated routes - Get decks with pagination (RECOMMENDED)
deckRouter.get('/page/:from/:to', authRequired, async (req, res) => {
	try {
		const userId = (req as any).user.userId;
		const userOrgId = (req as any).user.orgId;
		const isAdmin = (req as any).user.authLevel === 1;
		const from = parseInt(req.params.from);
		const to = parseInt(req.params.to);
		
		if (isNaN(from) || isNaN(to) || from < 0 || to < from) {
            return res.status(400).json({ error: 'Invalid page parameters. "from" and "to" must be valid numbers with to >= from >= 0' });
        }
		
		logRequest('Get decks by page endpoint accessed', req, res, { 
			userId, 
			userOrgId, 
			isAdmin,
			from,
			to
		});
		
		// Use paginated query handler for memory efficiency
		const result = await container.getDecksByPageQueryHandler.execute({
			userId,
			userOrgId,
			isAdmin,
			from,
			to
		});
		
		logRequest('Get decks page completed successfully', req, res, { 
			userId,
			from,
			to,
			returnedCount: result.decks.length,
			totalCount: result.totalCount
		});
		
		res.json(result);
	} catch (error) {
		logError('Get decks by page endpoint error', error as Error, req, res);
		res.status(500).json({ error: 'Internal server error' });
	}
});

deckRouter.post('/', authRequired, async (req, res) => {
	try {
		const userId = (req as any).user.userId;
		logRequest('Create deck endpoint accessed', req, res, { name: req.body.name, userId });
		req.body.userid = userId; // Set userId in request body
		const result = await container.createDeckCommandHandler.execute(req.body);
		
		logRequest('Deck created successfully', req, res, { deckId: result.id, name: req.body.name, userId });
		res.json(result);
	} catch (error) {
		logError('Create deck endpoint error', error as Error, req, res);
		
		if (error instanceof Error && (error.message.includes('duplicate') || error.message.includes('unique constraint'))) {
			return res.status(409).json({ error: 'Deck with this name already exists' });
		}
		
		if (error instanceof Error && error.message.includes('validation')) {
			return res.status(400).json({ error: 'Invalid input data', details: error.message });
		}
		
		res.status(500).json({ error: 'Internal server error' });
	}
});

deckRouter.get('/search', authRequired, async (req, res) => {
	try {
		const { query, limit, offset } = req.query;
		logRequest('Search decks endpoint accessed', req, res, { query, limit, offset });
		
		if (!query || typeof query !== 'string') {
			logWarning('Deck search attempted without query', { query, hasQuery: !!query }, req, res);
			return res.status(400).json({ error: 'Search query is required' });
		}
		
		const searchQuery = {
			query: query.trim(),
			limit: limit ? parseInt(limit as string) : 20,
			offset: offset ? parseInt(offset as string) : 0
		};
		
		// Validate pagination parameters
		if (searchQuery.limit < 1 || searchQuery.limit > 100) {
			logWarning('Invalid deck search limit parameter', { limit: searchQuery.limit }, req, res);
			return res.status(400).json({ error: 'Limit must be between 1 and 100' });
		}
		
		if (searchQuery.offset < 0) {
			logWarning('Invalid deck search offset parameter', { offset: searchQuery.offset }, req, res);
			return res.status(400).json({ error: 'Offset must be non-negative' });
		}
		
		const result = await searchService.searchFromUrl(req.originalUrl, searchQuery);
		
		logRequest('Deck search completed successfully', req, res, { 
			query: searchQuery.query, 
			resultCount: Array.isArray(result) ? result.length : 0 
		});
		res.json(result);
	} catch (error) {
		logError('Search decks endpoint error', error as Error, req, res);
		res.status(500).json({ error: 'Internal server error' });
	}
});

deckRouter.get('/:id', authRequired, async (req, res) => {
	try {
		const deckId = req.params.id;
		logRequest('Get deck by id endpoint accessed', req, res, { deckId });
		
		const result = await container.getDeckByIdQueryHandler.execute({ id: deckId });
		
		if (!result) {
			logWarning('Deck not found', { deckId }, req, res);
			return res.status(404).json({ error: 'Deck not found' });
		}
		
		logRequest('Deck retrieved successfully', req, res, { deckId });
		res.json(result);
	} catch (error) {
		logError('Get deck by id endpoint error', error as Error, req, res);
		res.status(500).json({ error: 'Internal server error' });
	}
});

deckRouter.patch('/:id', authRequired, async (req, res) => {
	try {
		const deckId = req.params.id;
		const userId = (req as any).user.userId;
		logRequest('Update deck endpoint accessed', req, res, { deckId, userId, updateFields: Object.keys(req.body) });
		
		const result = await container.updateDeckCommandHandler.execute({ id: deckId, ...req.body });
		
		logRequest('Deck updated successfully', req, res, { deckId, userId });
		res.json(result);
	} catch (error) {
		logError('Update deck endpoint error', error as Error, req, res);
		
		if (error instanceof Error && error.message.includes('not found')) {
			return res.status(404).json({ error: 'Deck not found' });
		}
		
		if (error instanceof Error && (error.message.includes('duplicate') || error.message.includes('unique constraint'))) {
			return res.status(409).json({ error: 'Deck with this name already exists' });
		}
		
		if (error instanceof Error && error.message.includes('validation')) {
			return res.status(400).json({ error: 'Invalid input data', details: error.message });
		}

		if (error instanceof Error && error.message.includes('admin')) {
			return res.status(403).json({ error: 'Forbidden: ' + error.message });
		}
		
		res.status(500).json({ error: 'Internal server error' });
	}
});

deckRouter.delete('/:id', authRequired, async (req, res) => {
	try {
		const deckId = req.params.id;
		const userId = (req as any).user.userId;
		logRequest('Soft delete deck endpoint accessed', req, res, { deckId, userId });
		
		const result = await container.deleteDeckCommandHandler.execute({ id: deckId, soft: true });
		
		logRequest('Deck soft delete successful', req, res, { deckId, userId, success: result });
		res.json({ success: result });
	} catch (error) {
		logError('Soft delete deck endpoint error', error as Error, req, res);
		
		if (error instanceof Error && error.message.includes('not found')) {
			return res.status(404).json({ error: 'Deck not found' });
		}
		
		res.status(500).json({ error: 'Internal server error' });
	}
});

export default deckRouter;