/**
 * Admin API Routes
 * Defines all administrative API endpoints with proper authentication and permissions
 */

const express = require('express');
const router = express.Router();

// Import middleware
const { authenticateAdmin, requirePermissions, requirePlayerAccess, auditAdminAction, ADMIN_PERMISSIONS } = require('../middleware/admin.middleware');
const { rateLimiters } = require('../middleware/rateLimit.middleware');
const { validators, validateRequest } = require('../middleware/validation.middleware');
const corsMiddleware = require('../middleware/cors.middleware');

// Import controllers
const adminAuthController = require('../controllers/admin/auth.controller');

// Import services for direct admin operations
const AdminService = require('../services/user/AdminService');
const adminService = new AdminService();

// Apply CORS to all admin routes
router.use(corsMiddleware);

// Apply admin-specific rate limiting
router.use(rateLimiters.admin);

/**
 * Admin API Status and Information
 */
router.get('/', (req, res) => {
    res.json({
        name: 'Shattered Void - Admin API',
        version: process.env.npm_package_version || '0.1.0',
        status: 'operational',
        timestamp: new Date().toISOString(),
        correlationId: req.correlationId,
        endpoints: {
            authentication: '/api/admin/auth',
            players: '/api/admin/players',
            system: '/api/admin/system',
            events: '/api/admin/events',
            analytics: '/api/admin/analytics'
        },
        note: 'Administrative access required for all endpoints'
    });
});

/**
 * Admin Authentication Routes
 * /api/admin/auth/*
 */
const authRoutes = express.Router();

// Public admin authentication endpoints
authRoutes.post('/login',
    rateLimiters.auth,
    validators.validateAdminLogin,
    auditAdminAction('admin_login'),
    adminAuthController.login
);

// Protected admin authentication endpoints
authRoutes.post('/logout',
    authenticateAdmin,
    auditAdminAction('admin_logout'),
    adminAuthController.logout
);

authRoutes.get('/me',
    authenticateAdmin,
    adminAuthController.getProfile
);

authRoutes.get('/verify',
    authenticateAdmin,
    adminAuthController.verifyToken
);

authRoutes.post('/refresh',
    rateLimiters.auth,
    adminAuthController.refresh
);

authRoutes.get('/stats',
    authenticateAdmin,
    requirePermissions([ADMIN_PERMISSIONS.ANALYTICS_READ]),
    auditAdminAction('view_system_stats'),
    adminAuthController.getSystemStats
);

authRoutes.post('/change-password',
    authenticateAdmin,
    rateLimiters.auth,
    validateRequest(require('joi').object({
        currentPassword: require('joi').string().required(),
        newPassword: require('joi').string().min(8).max(128).required()
    }), 'body'),
    auditAdminAction('admin_password_change'),
    adminAuthController.changePassword
);

// Mount admin authentication routes
router.use('/auth', authRoutes);

/**
 * Player Management Routes
 * /api/admin/players/*
 */
const playerRoutes = express.Router();

// All player management routes require authentication
playerRoutes.use(authenticateAdmin);

// Get players list
playerRoutes.get('/',
    requirePermissions([ADMIN_PERMISSIONS.PLAYER_DATA_READ]),
    validators.validatePagination,
    validateRequest(require('joi').object({
        search: require('joi').string().max(50).optional(),
        activeOnly: require('joi').boolean().optional(),
        sortBy: require('joi').string().valid('created_at', 'updated_at', 'username', 'email', 'last_login_at').default('created_at'),
        sortOrder: require('joi').string().valid('asc', 'desc').default('desc')
    }), 'query'),
    auditAdminAction('list_players'),
    async (req, res) => {
        try {
            const {
                page = 1,
                limit = 20,
                search = '',
                activeOnly = null,
                sortBy = 'created_at',
                sortOrder = 'desc'
            } = req.query;

            const result = await adminService.getPlayersList({
                page: parseInt(page),
                limit: parseInt(limit),
                search,
                activeOnly,
                sortBy,
                sortOrder
            }, req.correlationId);

            res.json({
                success: true,
                message: 'Players list retrieved successfully',
                data: result,
                correlationId: req.correlationId
            });

        } catch (error) {
            res.status(500).json({
                success: false,
                error: 'Failed to retrieve players list',
                message: error.message,
                correlationId: req.correlationId
            });
        }
    }
);

// Get specific player details
playerRoutes.get('/:playerId',
    requirePlayerAccess('playerId'),
    validators.validatePlayerId,
    auditAdminAction('view_player_details'),
    async (req, res) => {
        try {
            const playerId = parseInt(req.params.playerId);
            const playerDetails = await adminService.getPlayerDetails(playerId, req.correlationId);

            res.json({
                success: true,
                message: 'Player details retrieved successfully',
                data: {
                    player: playerDetails
                },
                correlationId: req.correlationId
            });

        } catch (error) {
            const statusCode = error.name === 'NotFoundError' ? 404 : 500;
            res.status(statusCode).json({
                success: false,
                error: error.name === 'NotFoundError' ? 'Player not found' : 'Failed to retrieve player details',
                message: error.message,
                correlationId: req.correlationId
            });
        }
    }
);

// Update player status (activate/deactivate)
playerRoutes.put('/:playerId/status',
    requirePermissions([ADMIN_PERMISSIONS.PLAYER_MANAGEMENT]),
    validators.validatePlayerId,
    validateRequest(require('joi').object({
        isActive: require('joi').boolean().required(),
        reason: require('joi').string().max(200).optional()
    }), 'body'),
    auditAdminAction('update_player_status'),
    async (req, res) => {
        try {
            const playerId = parseInt(req.params.playerId);
            const { isActive, reason } = req.body;

            const updatedPlayer = await adminService.updatePlayerStatus(
                playerId,
                isActive,
                req.correlationId
            );

            res.json({
                success: true,
                message: `Player ${isActive ? 'activated' : 'deactivated'} successfully`,
                data: {
                    player: updatedPlayer,
                    action: isActive ? 'activated' : 'deactivated',
                    reason: reason || null
                },
                correlationId: req.correlationId
            });

        } catch (error) {
            const statusCode = error.name === 'NotFoundError' ? 404 : 500;
            res.status(statusCode).json({
                success: false,
                error: error.name === 'NotFoundError' ? 'Player not found' : 'Failed to update player status',
                message: error.message,
                correlationId: req.correlationId
            });
        }
    }
);

// Mount player management routes
router.use('/players', playerRoutes);

/**
 * System Management Routes
 * /api/admin/system/*
 */
const systemRoutes = express.Router();

// All system routes require authentication
systemRoutes.use(authenticateAdmin);

// Get detailed system statistics
systemRoutes.get('/stats',
    requirePermissions([ADMIN_PERMISSIONS.SYSTEM_MANAGEMENT]),
    auditAdminAction('view_detailed_system_stats'),
    async (req, res) => {
        try {
            const stats = await adminService.getSystemStats(req.correlationId);

            // Add additional system information
            const systemInfo = {
                ...stats,
                server: {
                    version: process.env.npm_package_version || '0.1.0',
                    environment: process.env.NODE_ENV || 'development',
                    uptime: process.uptime(),
                    nodeVersion: process.version,
                    memory: {
                        used: Math.round(process.memoryUsage().heapUsed / 1024 / 1024),
                        total: Math.round(process.memoryUsage().heapTotal / 1024 / 1024),
                        rss: Math.round(process.memoryUsage().rss / 1024 / 1024)
                    }
                }
            };

            res.json({
                success: true,
                message: 'System statistics retrieved successfully',
                data: systemInfo,
                correlationId: req.correlationId
            });

        } catch (error) {
            res.status(500).json({
                success: false,
                error: 'Failed to retrieve system statistics',
                message: error.message,
                correlationId: req.correlationId
            });
        }
    }
);

// System health check
systemRoutes.get('/health',
    requirePermissions([ADMIN_PERMISSIONS.SYSTEM_MANAGEMENT]),
    async (req, res) => {
        try {
            // TODO: Implement comprehensive health checks
            // - Database connectivity
            // - Redis connectivity
            // - WebSocket server status
            // - External service connectivity

            const healthStatus = {
                status: 'healthy',
                timestamp: new Date().toISOString(),
                services: {
                    database: 'healthy',
                    redis: 'healthy',
                    websocket: 'healthy'
                },
                performance: {
                    uptime: process.uptime(),
                    memory: process.memoryUsage(),
                    cpu: process.cpuUsage()
                }
            };

            res.json({
                success: true,
                message: 'System health check completed',
                data: healthStatus,
                correlationId: req.correlationId
            });

        } catch (error) {
            res.status(500).json({
                success: false,
                error: 'Health check failed',
                message: error.message,
                correlationId: req.correlationId
            });
        }
    }
);

// Mount system routes
router.use('/system', systemRoutes);

/**
 * Events Management Routes (placeholder)
 * /api/admin/events/*
 */
router.get('/events',
    authenticateAdmin,
    requirePermissions([ADMIN_PERMISSIONS.EVENT_MANAGEMENT]),
    validators.validatePagination,
    auditAdminAction('view_events'),
    (req, res) => {
        res.json({
            success: true,
            message: 'Events endpoint - feature not yet implemented',
            data: {
                events: [],
                pagination: {
                    page: 1,
                    limit: 20,
                    total: 0,
                    totalPages: 0
                }
            },
            correlationId: req.correlationId
        });
    }
);

/**
 * Analytics Routes (placeholder)
 * /api/admin/analytics/*
 */
router.get('/analytics',
    authenticateAdmin,
    requirePermissions([ADMIN_PERMISSIONS.ANALYTICS_READ]),
    auditAdminAction('view_analytics'),
    (req, res) => {
        res.json({
            success: true,
            message: 'Analytics endpoint - feature not yet implemented',
            data: {
                analytics: {},
                timeRange: 'daily',
                metrics: []
            },
            correlationId: req.correlationId
        });
    }
);

/**
 * Error handling for admin routes
 */
router.use('*', (req, res) => {
    res.status(404).json({
        success: false,
        error: 'Admin API endpoint not found',
        message: `The endpoint ${req.method} ${req.originalUrl} does not exist`,
        correlationId: req.correlationId,
        timestamp: new Date().toISOString()
    });
});

module.exports = router;