import express 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 { logAuth, logError, logRequest, logWarning } from '../../Application/Services/Logger';

const chatRouter = express.Router();

// Get user's chats
chatRouter.get('/user-chats', authRequired, async (req, res) => {
    try {
        const userId = (req as any).user.userId;
        const includeArchived = req.query.includeArchived === 'true';
        
        logRequest('Get user chats endpoint accessed', req, res, { userId, includeArchived });
        
        const chats = await container.getUserChatsQueryHandler.execute({ 
            userId, 
            includeArchived 
        });
        
        logRequest('User chats retrieved successfully', req, res, { 
            userId, 
            chatCount: chats.length 
        });
        
        res.json(chats);
    } catch (error) {
        logError('Get user chats endpoint error', error as Error, req, res);
        return ErrorResponseService.sendInternalServerError(res);
    }
});

// Get chat history
chatRouter.get('/history/:chatId', 
    authRequired, 
    ValidationMiddleware.validateUUIDFormat(['chatId']),
    async (req, res) => {
    try {
        const userId = (req as any).user.userId;
        const chatId = req.params.chatId;
        
        logRequest('Get chat history endpoint accessed', req, res, { userId, chatId });
        
        const history = await container.getChatHistoryQueryHandler.execute({ 
            chatId, 
            userId 
        });
        
        if (!history) {
            logWarning('Chat history not found or unauthorized', { userId, chatId }, req, res);
            return ErrorResponseService.sendNotFound(res, 'Chat not found or unauthorized');
        }
        
        logRequest('Chat history retrieved successfully', req, res, { 
            userId, 
            chatId,
            messageCount: history.messages.length,
            isArchived: history.isArchived
        });
        
        res.json(history);
    } catch (error) {
        logError('Get chat history endpoint error', error as Error, req, res);
        return ErrorResponseService.sendInternalServerError(res);
    }
});

// Create new chat (direct/group)
chatRouter.post('/create', 
    authRequired,
    ValidationMiddleware.combine([
        ValidationMiddleware.validateRequiredFields(['type', 'userIds']),
        ValidationMiddleware.validateAllowedValues({ type: ['direct', 'group'] }),
        ValidationMiddleware.validateNonEmptyArrays(['userIds'])
    ]),
    async (req, res) => {
    try {
        const userId = (req as any).user.userId;
        const { type, name, userIds } = req.body;
        
        logRequest('Create chat endpoint accessed', req, res, { 
            userId, 
            type, 
            targetUserCount: userIds?.length || 0 
        });

        if (type === 'group' && !name?.trim()) {
            return ErrorResponseService.sendBadRequest(res, 'Group name is required');
        }
        
        const chat = await container.createChatCommandHandler.execute({
            type,
            name: name?.trim(),
            createdBy: userId,
            userIds
        });
        
        if (!chat) {
            return ErrorResponseService.sendBadRequest(res, 'Failed to create chat');
        }
        
        logRequest('Chat created successfully', req, res, { 
            userId, 
            chatId: chat.id,
            chatType: chat.type
        });
        
        res.json({
            id: chat.id,
            type: chat.type,
            name: chat.name,
            users: chat.users,
            messages: chat.messages
        });
    } catch (error) {
        logError('Create chat endpoint error', error as Error, req, res);
        
        if (error instanceof Error) {
            if (error.message.includes('Premium subscription required')) {
                return ErrorResponseService.sendForbidden(res, 'Premium subscription required to create groups');
            }
            if (error.message.includes('not found')) {
                return ErrorResponseService.sendNotFound(res, 'One or more users not found');
            }
        }
        
        return ErrorResponseService.sendInternalServerError(res);
    }
});

// Send message (REST endpoint - mainly for testing, real messaging is via WebSocket)
chatRouter.post('/message', 
    authRequired, 
    ValidationMiddleware.combine([
        ValidationMiddleware.validateRequiredFields(['chatId', 'message']),
        ValidationMiddleware.validateUUIDFormat(['chatId']),
        ValidationMiddleware.validateStringLength({ message: { min: 1, max: 2000 } })
    ]),
    async (req, res) => {
    try {
        const userId = (req as any).user.userId;
        const { chatId, message } = req.body;
        
        logRequest('Send message endpoint accessed', req, res, { 
            userId, 
            chatId,
            messageLength: message?.length || 0
        });
        
        const sentMessage = await container.sendMessageCommandHandler.execute({
            chatId,
            userId,
            message
        });
        
        if (!sentMessage) {
            return ErrorResponseService.sendBadRequest(res, 'Failed to send message');
        }
        
        logRequest('Message sent successfully', req, res, { 
            userId, 
            chatId,
            messageId: sentMessage.id
        });
        
        res.json(sentMessage);
    } catch (error) {
        logError('Send message endpoint error', error as Error, req, res);
        
        if (error instanceof Error) {
            if (error.message.includes('Chat not found')) {
                return ErrorResponseService.sendNotFound(res, 'Chat not found');
            }
            if (error.message.includes('not a member')) {
                return ErrorResponseService.sendForbidden(res, 'Not authorized to send messages to this chat');
            }
            if (error.message.includes('non-empty string')) {
                return ErrorResponseService.sendBadRequest(res, 'Message must be a non-empty string');
            }
        }
        
        return ErrorResponseService.sendInternalServerError(res);
    }
});

// Archive chat manually
chatRouter.post('/archive/:chatId', 
    authRequired, 
    ValidationMiddleware.validateUUIDFormat(['chatId']),
    async (req, res) => {
    try {
        const userId = (req as any).user.userId;
        const chatId = req.params.chatId;
        
        logRequest('Archive chat endpoint accessed', req, res, { userId, chatId });
        
        // Check if user has access to this chat
        const chat = await container.chatRepository.findById(chatId);
        if (!chat) {
            return ErrorResponseService.sendNotFound(res, 'Chat not found');
        }
        
        if (!chat.users.includes(userId)) {
            return ErrorResponseService.sendForbidden(res, 'Not authorized to archive this chat');
        }
        
        const success = await container.archiveChatCommandHandler.execute({ chatId });
        
        if (!success) {
            return ErrorResponseService.sendBadRequest(res, 'Failed to archive chat');
        }
        
        logRequest('Chat archived successfully', req, res, { userId, chatId });
        res.json({ success: true, message: 'Chat archived successfully' });
        
    } catch (error) {
        logError('Archive chat endpoint error', error as Error, req, res);
        return ErrorResponseService.sendInternalServerError(res);
    }
});

// Restore chat from archive
chatRouter.post('/restore/:chatId', 
    authRequired, 
    ValidationMiddleware.validateUUIDFormat(['chatId']),
    async (req, res) => {
    try {
        const userId = (req as any).user.userId;
        const chatId = req.params.chatId;
        
        logRequest('Restore chat endpoint accessed', req, res, { userId, chatId });
        
        // Check if user has access to this archived chat
        const archive = await container.chatArchiveRepository.findByChatId(chatId);
        const userArchive = archive.find((a: any) => a.participants.includes(userId));
        
        if (!userArchive) {
            return ErrorResponseService.sendNotFound(res, 'Archived chat not found or unauthorized');
        }
        
        const success = await container.restoreChatCommandHandler.execute({ chatId });
        
        if (!success) {
            return ErrorResponseService.sendBadRequest(res, 'Failed to restore chat (game chats cannot be restored)');
        }
        
        logRequest('Chat restored successfully', req, res, { userId, chatId });
        res.json({ success: true, message: 'Chat restored successfully' });
        
    } catch (error) {
        logError('Restore chat endpoint error', error as Error, req, res);
        return ErrorResponseService.sendInternalServerError(res);
    }
});

// Get archived chats for a game
chatRouter.get('/archived/game/:gameId', 
    authRequired, 
    ValidationMiddleware.validateUUIDFormat(['gameId']),
    async (req, res) => {
    try {
        const userId = (req as any).user.userId;
        const gameId = req.params.gameId;
        
        logRequest('Get archived game chats endpoint accessed', req, res, { userId, gameId });
        
        const archivedChats = await container.getArchivedChatsQueryHandler.execute({
            userId,
            gameId
        });
        
        logRequest('Archived game chats retrieved successfully', req, res, { 
            userId, 
            gameId,
            chatCount: archivedChats.length
        });
        
        res.json(archivedChats);
    } catch (error) {
        logError('Get archived game chats endpoint error', error as Error, req, res);
        return ErrorResponseService.sendInternalServerError(res);
    }
});

export default chatRouter;