// Authentication Handler
class Auth {
    constructor() {
        this.user = null;
        this.isAuthenticated = false;
        this.checkAuth();
    }

    async checkAuth() {
        try {
            const response = await api.getCurrentUser();
            if (response.success) {
                this.user = response.user;
                this.isAuthenticated = true;
                return true;
            }
        } catch (error) {
            this.logout();
        }
        return false;
    }

    async login(email, password) {
        try {
            const response = await api.login(email, password);
            if (response.success) {
                this.user = response.user;
                this.isAuthenticated = true;
                return { success: true, user: this.user };
            }
            return { success: false, error: response.message };
        } catch (error) {
            return { success: false, error: error.message };
        }
    }

    async register(name, email, password) {
        try {
            const response = await api.register(name, email, password);
            if (response.success) {
                return { success: true, message: 'Регистрация успешна. Теперь вы можете войти.' };
            }
            return { success: false, error: response.message };
        } catch (error) {
            return { success: false, error: error.message };
        }
    }

    async logout() {
        try {
            await api.logout();
        } catch (error) {
            console.error('Logout error:', error);
        }
        this.user = null;
        this.isAuthenticated = false;
        window.location.hash = '#login';
    }

    hasRole(role) {
        return this.user && this.user.role === role;
    }

    hasPermission(permission) {
        if (!this.user) return false;
        return this.user.permissions && this.user.permissions.includes(permission);
    }

    getUser() {
        return this.user;
    }

    isAdmin() {
        return this.user && (this.user.role === 'superadmin' || this.user.role === 'admin');
    }

    isSuperAdmin() {
        return this.user && this.user.role === 'superadmin';
    }
}

// Global auth instance
const auth = new Auth();

// Login/Register form handler
document.addEventListener('DOMContentLoaded', () => {
    // Tab switching
    const authTabBtns = document.querySelectorAll('.auth-tab-btn');
    const authForms = document.querySelectorAll('.auth-form');

    authTabBtns.forEach(btn => {
        btn.addEventListener('click', () => {
            const tab = btn.dataset.tab;

            // Update active tab
            authTabBtns.forEach(b => b.classList.remove('active'));
            btn.classList.add('active');

            // Show/hide forms
            authForms.forEach(form => form.classList.add('hidden'));
            if (tab === 'login') {
                document.getElementById('loginForm').classList.remove('hidden');
            } else {
                document.getElementById('registerForm').classList.remove('hidden');
            }
        });
    });

    // Login form
    const loginForm = document.getElementById('loginForm');
    if (loginForm) {
        loginForm.addEventListener('submit', async (e) => {
            e.preventDefault();

            const email = document.getElementById('loginEmail').value;
            const password = document.getElementById('loginPassword').value;

            const loginText = document.querySelector('.login-text');
            const loginLoader = document.querySelector('.login-loader');

            loginText.style.display = 'none';
            loginLoader.classList.remove('hidden');

            const result = await auth.login(email, password);

            if (result.success) {
                // Redirect to dashboard
                setTimeout(() => {
                    window.location.hash = '#dashboard';
                }, 500);
            } else {
                showAuthError(result.error);
                loginText.style.display = 'block';
                loginLoader.classList.add('hidden');
            }
        });
    }

    // Register form
    const registerForm = document.getElementById('registerForm');
    if (registerForm) {
        registerForm.addEventListener('submit', async (e) => {
            e.preventDefault();

            const name = document.getElementById('registerName').value;
            const email = document.getElementById('registerEmail').value;
            const password = document.getElementById('registerPassword').value;
            const confirmPassword = document.getElementById('registerPasswordConfirm').value;

            if (password !== confirmPassword) {
                showAuthError('Пароли не совпадают');
                return;
            }

            const registerText = document.querySelector('.register-text');
            const registerLoader = document.querySelector('.register-loader');

            registerText.style.display = 'none';
            registerLoader.classList.remove('hidden');

            const result = await auth.register(name, email, password);

            if (result.success) {
                showAuthError(result.message, 'success');
                // Clear form and switch to login
                registerForm.reset();
                document.querySelector('[data-tab="login"]').click();
            } else {
                showAuthError(result.error);
            }

            registerText.style.display = 'block';
            registerLoader.classList.add('hidden');
        });
    }
});

function showAuthError(message, type = 'error') {
    const errorDiv = document.getElementById('authError');
    const errorText = document.getElementById('authErrorText');

    if (type === 'success') {
        errorDiv.classList.remove('bg-red-50', 'border-red-200', 'text-red-600', 'dark:bg-red-900/20', 'dark:border-red-800', 'dark:text-red-400');
        errorDiv.classList.add('bg-green-50', 'border-green-200', 'text-green-600', 'dark:bg-green-900/20', 'dark:border-green-800', 'dark:text-green-400');
        const icon = errorDiv.querySelector('i');
        if (icon) {
            icon.setAttribute('data-lucide', 'check-circle');
        }
    } else {
        errorDiv.classList.remove('bg-green-50', 'border-green-200', 'text-green-600', 'dark:bg-green-900/20', 'dark:border-green-800', 'dark:text-green-400');
        errorDiv.classList.add('bg-red-50', 'border-red-200', 'text-red-600', 'dark:bg-red-900/20', 'dark:border-red-800', 'dark:text-red-400');
        const icon = errorDiv.querySelector('i');
        if (icon) {
            icon.setAttribute('data-lucide', 'alert-circle');
        }
    }

    errorText.textContent = message;
    errorDiv.classList.remove('hidden');

    // Auto-hide success messages
    if (type === 'success') {
        setTimeout(() => {
            errorDiv.classList.add('hidden');
        }, 3000);
    }

    // Update Lucide icons
    if (typeof lucide !== 'undefined') {
        lucide.createIcons();
    }
}