// AI Server Admin Login JavaScript

class LoginManager {
    constructor() {
        this.baseUrl = window.location.origin;
        this.init();
    }

    init() {
        // Check if already logged in
        this.checkExistingAuth();
        
        // Setup form submission
        document.getElementById('login-form').addEventListener('submit', (e) => {
            e.preventDefault();
            this.handleLogin();
        });

        // Setup enter key handling
        document.addEventListener('keypress', (e) => {
            if (e.key === 'Enter') {
                this.handleLogin();
            }
        });

        // Auto-focus username field
        document.getElementById('username').focus();
    }

    async checkExistingAuth() {
        const token = localStorage.getItem('ai_admin_token');
        if (token) {
            try {
                console.log('Checking existing token...');
                // Verify token is still valid
                const response = await fetch(`${this.baseUrl}/admin/verify-token`, {
                    headers: {
                        'Authorization': `Bearer ${token}`
                    }
                });
                
                if (response.ok) {
                    console.log('Token is valid, redirecting to admin...');
                    // Token is valid, redirect to admin
                    window.location.href = '/admin';
                    return;
                } else {
                    console.log('Token verification failed with status:', response.status);
                }
            } catch (error) {
                console.log('Token verification failed:', error);
            }
            
            // Token is invalid, remove it
            console.log('Removing invalid token...');
            localStorage.removeItem('ai_admin_token');
            localStorage.removeItem('ai_admin_user');
        }
    }

    async handleLogin() {
        const username = document.getElementById('username').value.trim();
        const password = document.getElementById('password').value;
        const rememberMe = document.getElementById('remember-me').checked;

        // Validation
        if (!username || !password) {
            this.showError('Please enter both username and password');
            return;
        }

        // Show loading state
        this.setLoading(true);
        this.hideError();

        try {
            const response = await fetch(`${this.baseUrl}/admin/login`, {
                method: 'POST',
                headers: {
                    'Content-Type': 'application/json'
                },
                body: JSON.stringify({
                    username,
                    password,
                    remember_me: rememberMe
                })
            });

            const data = await response.json();

            if (response.ok && data.success) {
                // Store JWT token
                localStorage.setItem('ai_admin_token', data.token);
                
                // Store user info
                localStorage.setItem('ai_admin_user', JSON.stringify(data.user));
                
                console.log('Token stored:', data.token.substring(0, 20) + '...');
                console.log('User stored:', data.user);
                
                // Show success message
                this.showSuccess('Login successful! Redirecting...');
                
                // Redirect after short delay
                setTimeout(() => {
                    window.location.href = '/admin';
                }, 1000);
                
            } else {
                this.showError(data.message || 'Login failed. Please check your credentials.');
            }

        } catch (error) {
            console.error('Login error:', error);
            this.showError('Connection error. Please try again.');
        } finally {
            this.setLoading(false);
        }
    }

    setLoading(loading) {
        const btn = document.getElementById('login-btn');
        const icon = btn.querySelector('i');
        
        if (loading) {
            btn.disabled = true;
            btn.classList.add('loading');
            icon.className = 'fas fa-spinner';
            btn.querySelector('span') ? 
                btn.querySelector('span').textContent = 'Signing In...' : 
                btn.innerHTML = '<i class="fas fa-spinner"></i> Signing In...';
        } else {
            btn.disabled = false;
            btn.classList.remove('loading');
            icon.className = 'fas fa-sign-in-alt';
            btn.innerHTML = '<i class="fas fa-sign-in-alt"></i> Sign In';
        }
    }

    showError(message) {
        const errorDiv = document.getElementById('error-message');
        const errorText = document.getElementById('error-text');
        
        errorText.textContent = message;
        errorDiv.style.display = 'flex';
        
        // Auto-hide after 5 seconds
        setTimeout(() => {
            this.hideError();
        }, 5000);
    }

    hideError() {
        document.getElementById('error-message').style.display = 'none';
    }

    showSuccess(message) {
        // Create success message element if it doesn't exist
        let successDiv = document.getElementById('success-message');
        if (!successDiv) {
            successDiv = document.createElement('div');
            successDiv.id = 'success-message';
            successDiv.className = 'success-message';
            successDiv.innerHTML = `
                <i class="fas fa-check-circle"></i>
                <span id="success-text">${message}</span>
            `;
            
            // Add CSS for success message
            const style = document.createElement('style');
            style.textContent = `
                .success-message {
                    background: #d5f4e6;
                    border: 1px solid #27ae60;
                    border-radius: 8px;
                    padding: 0.75rem;
                    margin-bottom: 1rem;
                    display: flex;
                    align-items: center;
                    gap: 0.5rem;
                    color: #27ae60;
                    font-size: 0.9rem;
                    animation: slideDown 0.3s ease-out;
                }
                
                @keyframes slideDown {
                    from {
                        opacity: 0;
                        transform: translateY(-10px);
                    }
                    to {
                        opacity: 1;
                        transform: translateY(0);
                    }
                }
            `;
            document.head.appendChild(style);
            
            // Insert before error message
            const errorDiv = document.getElementById('error-message');
            errorDiv.parentNode.insertBefore(successDiv, errorDiv);
        } else {
            document.getElementById('success-text').textContent = message;
            successDiv.style.display = 'flex';
        }
    }
}

// Password toggle functionality
function togglePassword() {
    const passwordInput = document.getElementById('password');
    const passwordEye = document.getElementById('password-eye');
    
    if (passwordInput.type === 'password') {
        passwordInput.type = 'text';
        passwordEye.className = 'fas fa-eye-slash';
    } else {
        passwordInput.type = 'password';
        passwordEye.className = 'fas fa-eye';
    }
}

// Initialize login manager when page loads
document.addEventListener('DOMContentLoaded', () => {
    new LoginManager();
});

// Security: Clear sensitive data on page unload
window.addEventListener('beforeunload', () => {
    // Clear password field
    const passwordField = document.getElementById('password');
    if (passwordField) {
        passwordField.value = '';
    }
});