// 🤠 Heady Authentication Status Endpoint - System Health & Stats

/**
 * Returns authentication system status and statistics
 * Used for health checks, monitoring, and admin dashboards
 */

import type { APIRoute } from 'astro';
import { getSessionManager } from '../../../lib/auth/session-manager.js';
import {
	getRoleMappingConfig,
	loadAuthentikConfig,
	validateAuthentikConfig,
} from '../../../lib/config/authentik.js';

// Force SSR — this route reads env vars and must not be prerendered
export const prerender = false;

export const GET: APIRoute = async ({ url, cookies }) => {
	try {

		// Load configuration
		const config = loadAuthentikConfig();
		const validation = validateAuthentikConfig();
		const roleMappingConfig = getRoleMappingConfig();

		// Check if detailed stats are requested (requires admin access)
		const includeStats = url.searchParams.get('stats') === 'true';

		// Basic status available to everyone
		const basicStatus = {
			service: 'Heady Authentication',
			status: validation.valid ? 'healthy' : 'configuration_error',
			version: '1.0.0',
			authentik_configured: !!config.issuer,
			authentication: {
				provider: 'Authentik OIDC',
				issuer: config.issuer,
				redirect_uri: config.redirectUri,
			},
			timestamp: new Date().toISOString(),
		};

		if (!validation.valid) {
			return new Response(
				JSON.stringify({
					...basicStatus,
					errors: validation.errors,
				}),
				{
					status: 503, // Service Unavailable
					headers: { 'Content-Type': 'application/json' },
				},
			);
		}

		// If detailed stats not requested, return basic status
		if (!includeStats) {
			return new Response(JSON.stringify(basicStatus), {
				status: 200,
				headers: { 'Content-Type': 'application/json' },
			});
		}

		// Detailed stats require authentication
		const sessionMgr = getSessionManager();
		const validationResult = await sessionMgr.validateSession({ cookies });

		if (!validationResult.valid || !validationResult.user) {
			return new Response(
				JSON.stringify({
					...basicStatus,
					error: 'Authentication required for detailed statistics',
					login_url: '/api/auth/login',
				}),
				{
					status: 401,
					headers: { 'Content-Type': 'application/json' },
				},
			);
		}

		const user = validationResult.user;

		// Check if user can view statistics (admin/auditor roles)
		const canViewStats = ['owner', 'admin', 'auditor'].includes(user.role);

		if (!canViewStats) {
			return new Response(
				JSON.stringify({
					...basicStatus,
					error: 'Insufficient permissions for detailed statistics',
					required_roles: ['owner', 'admin', 'auditor'],
					user_role: user.role,
				}),
				{
					status: 403,
					headers: { 'Content-Type': 'application/json' },
				},
			);
		}

		// Get session statistics (simplified for now)
		const activeSessionCount = await sessionMgr.getActiveCount();

		const detailedStatus = {
			...basicStatus,
			configuration: {
				scopes: config.scopes,
				role_mapping: {
					environment_configured: Object.values(roleMappingConfig).some(
						(groups) => groups.length > 0,
					),
					owner_groups: roleMappingConfig.ownerGroups,
					admin_groups: roleMappingConfig.adminGroups,
					network_admin_groups: roleMappingConfig.networkGroups,
					it_admin_groups: roleMappingConfig.itGroups,
					auditor_groups: roleMappingConfig.auditorGroups,
				},
			},
			sessions: {
				total_active: activeSessionCount,
				// Additional session stats would go here
			},
			system: {
				uptime: process.uptime(),
				memory_usage: process.memoryUsage(),
				node_version: process.version,
				environment: process.env.NODE_ENV || 'unknown',
			},
		};

		console.log(`✓ Auth status requested by ${user.email} (${user.role})`);
		console.log(`  Active sessions: ${activeSessionCount}`);

		return new Response(JSON.stringify(detailedStatus), {
			status: 200,
			headers: { 'Content-Type': 'application/json' },
		});
	} catch (error) {
		console.error('❌ Auth status error:', error);

		return new Response(
			JSON.stringify({
				service: 'Heady Authentication',
				status: 'error',
				error: 'Status check failed',
				message: error instanceof Error ? error.message : 'Unknown error',
				timestamp: new Date().toISOString(),
			}),
			{
				status: 500,
				headers: { 'Content-Type': 'application/json' },
			},
		);
	}
};