/**
 * Route Guard
 * 
 * Provides route-level access control and guards.
 */

import { Logger } from '../../core/logger.js';

/**
 * RouteGuard - Route access control
 */
export class RouteGuard {
    constructor(name, guardFn) {
        this.name = name;
        this.guardFn = guardFn;
    }
    
    /**
     * Create a new RouteGuard
     */
    static create(name, guardFn) {
        return new RouteGuard(name, guardFn);
    }
    
    /**
     * Execute guard
     */
    async execute(to, from, context = {}) {
        try {
            const result = await this.guardFn(to, from, context);
            return {
                allowed: result !== false && result !== null,
                redirect: typeof result === 'string' ? result : null,
                reason: typeof result === 'object' && result.reason ? result.reason : null
            };
        } catch (error) {
            Logger.error(`[RouteGuard] Guard "${this.name}" error:`, error);
            return {
                allowed: false,
                redirect: null,
                reason: error.message
            };
        }
    }
}

/**
 * Built-in guards
 */
export const BuiltInGuards = {
    /**
     * Require authentication
     */
    auth: RouteGuard.create('auth', async (to, from) => {
        // Check if user is authenticated
        // This would need to be implemented based on your auth system
        const isAuthenticated = checkAuth(); // Placeholder
        if (!isAuthenticated) {
            return '/login';
        }
        return true;
    }),
    
    /**
     * Require guest (not authenticated)
     */
    guest: RouteGuard.create('guest', async (to, from) => {
        const isAuthenticated = checkAuth(); // Placeholder
        if (isAuthenticated) {
            return '/';
        }
        return true;
    }),
    
    /**
     * Require specific role
     */
    role: (requiredRole) => RouteGuard.create('role', async (to, from) => {
        const userRole = getUserRole(); // Placeholder
        if (userRole !== requiredRole) {
            return '/unauthorized';
        }
        return true;
    }),
    
    /**
     * Require permission
     */
    permission: (requiredPermission) => RouteGuard.create('permission', async (to, from) => {
        const hasPermission = checkPermission(requiredPermission); // Placeholder
        if (!hasPermission) {
            return '/unauthorized';
        }
        return true;
    })
};

// Placeholder functions (would be implemented based on auth system)
function checkAuth() {
    // Implementation depends on auth system
    return false;
}

function getUserRole() {
    // Implementation depends on auth system
    return null;
}

function checkPermission(permission) {
    // Implementation depends on auth system
    return false;
}