class UserManagement {
    constructor() {
        this.authManager = authManager;
    }

    getCurrentUser() {
        return this.authManager.getCurrentUser();
    }

    getUserProfile() {
        const user = this.getCurrentUser();
        return user ? {
            userId: user.userId,
            username: user.username,
            email: user.email,
            role: user.role,
            profile: user.profile,
            progress: user.progress
        } : null;
    }

    updateProfile(updates) {
        const users = this.authManager.getUsers();
        const currentUser = this.getCurrentUser();
        
        if (!currentUser) {
            return { success: false, message: 'User not authenticated' };
        }

        const user = users[currentUser.userId];
        if (!user) {
            return { success: false, message: 'User not found' };
        }

        // به‌روزرسانی فیلدها
        if (updates.email) user.email = updates.email;
        if (updates.profile) {
            user.profile = { ...user.profile, ...updates.profile };
        }

        this.authManager.saveUsers(users);
        this.authManager.setCurrentUser(user);

        return { success: true, user: user };
    }

    changePassword(currentPassword, newPassword) {
        const users = this.authManager.getUsers();
        const currentUser = this.getCurrentUser();
        
        if (!currentUser) {
            return { success: false, message: 'User not authenticated' };
        }

        const user = users[currentUser.userId];
        const currentHashedPassword = this.authManager.hashPassword(currentPassword);
        
        if (user.password !== currentHashedPassword) {
            return { success: false, message: 'Current password is incorrect' };
        }

        user.password = this.authManager.hashPassword(newPassword);
        this.authManager.saveUsers(users);

        return { success: true, message: 'Password changed successfully' };
    }

    getAllUsers() {
        if (!authzManager.canManageUsers()) {
            return { success: false, message: 'Access denied' };
        }

        const users = this.authManager.getUsers();
        // حذف اطلاعات حساس قبل از بازگرداندن
        const sanitizedUsers = {};
        for (const userId in users) {
            const user = users[userId];
            sanitizedUsers[userId] = {
                userId: user.userId,
                username: user.username,
                email: user.email,
                role: user.role,
                profile: user.profile,
                progress: user.progress,
                isActive: user.isActive,
                createdAt: user.createdAt
            };
        }

        return { success: true, users: sanitizedUsers };
    }

    deactivateUser(userId) {
        if (!authzManager.canManageUsers()) {
            return { success: false, message: 'Access denied' };
        }

        const users = this.authManager.getUsers();
        if (users[userId]) {
            users[userId].isActive = false;
            this.authManager.saveUsers(users);
            return { success: true, message: 'User deactivated successfully' };
        }

        return { success: false, message: 'User not found' };
    }

    getUserProgress(userId = null) {
        const targetUserId = userId || (this.getCurrentUser()?.userId);
        if (!targetUserId) {
            return { success: false, message: 'User not specified' };
        }

        const users = this.authManager.getUsers();
        const user = users[targetUserId];
        
        if (!user) {
            return { success: false, message: 'User not found' };
        }

        // اگر کاربر درخواست‌دهنده خود کاربر باشد یا ادمین باشد
        const currentUser = this.getCurrentUser();
        if (currentUser.userId !== targetUserId && !authzManager.canManageUsers()) {
            return { success: false, message: 'Access denied' };
        }

        return { success: true, progress: user.progress };
    }

    updateUserProgress(score = 0, completedLesson = null) {
        const currentUser = this.getCurrentUser();
        if (!currentUser) {
            return { success: false, message: 'User not authenticated' };
        }

        return this.authManager.updateUserProgress(currentUser.userId, score, completedLesson);
    }

    getLeaderboard(limit = 10) {
        const users = this.authManager.getUsers();
        const usersArray = Object.values(users)
            .filter(user => user.isActive)
            .map(user => ({
                username: user.username,
                profile: user.profile,
                progress: user.progress
            }))
            .sort((a, b) => (b.progress.totalScore || 0) - (a.progress.totalScore || 0))
            .slice(0, limit);

        return { success: true, leaderboard: usersArray };
    }
}

// ایجاد نمونه singleton
const userManager = new UserManagement();