// DOM Elements
const contactForm = document.getElementById('contactForm');
const submitBtn = document.getElementById('submitBtn');
const toast = document.getElementById('toast');
const formSuccess = document.getElementById('formSuccess');
const formError = document.getElementById('formError');
const messageTextarea = document.getElementById('message');
const charCount = document.getElementById('charCount');

// Form validation
const validateEmail = (email) => {
    const emailRegex = /^[^\s@]+@[^\s@]+\.[^\s@]+$/;
    return emailRegex.test(email);
};

const validatePhone = (phone) => {
    const phoneRegex = /^[\+]?[1-9][\d]{0,15}$/;
    return phone === '' || phoneRegex.test(phone.replace(/[\s\-\(\)]/g, ''));
};

const showError = (fieldId, message) => {
    const errorElement = document.getElementById(fieldId + 'Error');
    const inputElement = document.getElementById(fieldId);

    if (errorElement) {
        errorElement.textContent = message;
    }
    if (inputElement) {
        inputElement.classList.add('error');
    }
};

const clearError = (fieldId) => {
    const errorElement = document.getElementById(fieldId + 'Error');
    const inputElement = document.getElementById(fieldId);

    if (errorElement) {
        errorElement.textContent = '';
    }
    if (inputElement) {
        inputElement.classList.remove('error');
    }
};

const clearAllErrors = () => {
    const errorElements = document.querySelectorAll('.error-message');
    const inputElements = document.querySelectorAll('.error');

    errorElements.forEach(el => el.textContent = '');
    inputElements.forEach(el => el.classList.remove('error'));
};

// Character counter for message textarea
messageTextarea.addEventListener('input', () => {
    const length = messageTextarea.value.length;
    charCount.textContent = length;

    if (length > 1000) {
        charCount.style.color = 'var(--error)';
        messageTextarea.style.borderColor = 'var(--error)';
    } else {
        charCount.style.color = 'var(--text-secondary)';
        messageTextarea.style.borderColor = 'var(--border)';
    }
});

// Real-time validation
document.getElementById('email').addEventListener('blur', (e) => {
    const email = e.target.value.trim();
    if (email && !validateEmail(email)) {
        showError('email', 'Please enter a valid email address');
    } else {
        clearError('email');
    }
});

document.getElementById('phone').addEventListener('blur', (e) => {
    const phone = e.target.value.trim();
    if (phone && !validatePhone(phone)) {
        showError('phone', 'Please enter a valid phone number');
    } else {
        clearError('phone');
    }
});

// Clear errors on input
['firstName', 'lastName', 'email', 'phone', 'subject', 'message'].forEach(fieldId => {
    const element = document.getElementById(fieldId);
    if (element) {
        element.addEventListener('input', () => clearError(fieldId));
    }
});

// Set loading state
const setLoadingState = (loading) => {
    if (loading) {
        submitBtn.classList.add('loading');
        submitBtn.disabled = true;
    } else {
        submitBtn.classList.remove('loading');
        submitBtn.disabled = false;
    }
};

// Show toast notification
const showToast = (message, type = 'success') => {
    const toastMessage = toast.querySelector('.toast-message');
    const toastIcon = toast.querySelector('.toast-icon');

    toastMessage.textContent = message;

    if (type === 'success') {
        toast.style.background = 'var(--success)';
        toastIcon.textContent = '✓';
    } else {
        toast.style.background = 'var(--error)';
        toastIcon.textContent = '✕';
    }

    toast.classList.add('show');

    setTimeout(() => {
        toast.classList.remove('show');
    }, 4000);
};

// API Configuration
const API_BASE_URL = '/api/v1';
const CONTACT_ENDPOINT = `${API_BASE_URL}/contact`;

// Submit contact form
const submitContactForm = async (formData) => {
    try {
        const response = await fetch(CONTACT_ENDPOINT, {
            method: 'POST',
            headers: {
                'Content-Type': 'application/json',
                'Accept': 'application/json',
            },
            body: JSON.stringify(formData)
        });

        const data = await response.json();

        if (!response.ok) {
            throw new Error(data.message || `HTTP error! status: ${response.status}`);
        }

        return data;
    } catch (error) {
        if (error.name === 'TypeError' && error.message.includes('fetch')) {
            throw new Error('Network error. Please check your connection and try again.');
        }
        throw error;
    }
};

// Form submission handler
contactForm.addEventListener('submit', async (e) => {
    e.preventDefault();

    // Clear previous states
    clearAllErrors();
    formSuccess.classList.remove('show');
    formError.classList.remove('show');

    // Get form data
    const formData = new FormData(contactForm);
    const data = {
        firstName: formData.get('firstName').trim(),
        lastName: formData.get('lastName').trim(),
        email: formData.get('email').trim(),
        phone: formData.get('phone').trim(),
        company: formData.get('company').trim(),
        subject: formData.get('subject'),
        priority: formData.get('priority'),
        message: formData.get('message').trim(),
        newsletter: formData.get('newsletter') === 'on',
        privacy: formData.get('privacy') === 'on'
    };

    // Validate required fields
    let hasErrors = false;

    if (!data.firstName) {
        showError('firstName', 'First name is required');
        hasErrors = true;
    }

    if (!data.lastName) {
        showError('lastName', 'Last name is required');
        hasErrors = true;
    }

    if (!data.email) {
        showError('email', 'Email address is required');
        hasErrors = true;
    } else if (!validateEmail(data.email)) {
        showError('email', 'Please enter a valid email address');
        hasErrors = true;
    }

    if (data.phone && !validatePhone(data.phone)) {
        showError('phone', 'Please enter a valid phone number');
        hasErrors = true;
    }

    if (!data.subject) {
        showError('subject', 'Please select a subject');
        hasErrors = true;
    }

    if (!data.message) {
        showError('message', 'Message is required');
        hasErrors = true;
    } else if (data.message.length > 1000) {
        showError('message', 'Message must be 1000 characters or less');
        hasErrors = true;
    }

    if (!data.privacy) {
        showError('privacy', 'You must agree to the Privacy Policy and Terms of Service');
        hasErrors = true;
    }

    if (hasErrors) {
        return;
    }

    // Set loading state
    setLoadingState(true);

    try {
        // Submit form data
        const response = await submitContactForm(data);

        // Show success message
        formSuccess.classList.add('show');
        showToast('Message sent successfully! We\'ll get back to you soon.', 'success');

        // Reset form
        contactForm.reset();
        charCount.textContent = '0';

        // Scroll to success message
        formSuccess.scrollIntoView({ behavior: 'smooth', block: 'center' });

    } catch (error) {
        console.error('Contact form error:', error);

        // Show error message
        const errorMessage = document.getElementById('errorMessage');
        errorMessage.textContent = error.message || 'Something went wrong. Please try again.';
        formError.classList.add('show');

        showToast('Failed to send message. Please try again.', 'error');

        // Scroll to error message
        formError.scrollIntoView({ behavior: 'smooth', block: 'center' });

    } finally {
        setLoadingState(false);
    }
});

// FAQ functionality
document.querySelectorAll('.faq-question').forEach(question => {
    question.addEventListener('click', () => {
        const faqId = question.dataset.faq;
        const answer = document.getElementById(`faq-${faqId}`);
        const isActive = question.classList.contains('active');

        // Close all other FAQs
        document.querySelectorAll('.faq-question').forEach(q => {
            q.classList.remove('active');
        });
        document.querySelectorAll('.faq-answer').forEach(a => {
            a.classList.remove('active');
        });

        // Toggle current FAQ
        if (!isActive) {
            question.classList.add('active');
            answer.classList.add('active');
        }
    });
});

// Contact option handlers
document.getElementById('liveChatBtn').addEventListener('click', () => {
    showToast('Opening live chat...', 'success');
    // In a real app, this would open a chat widget
    setTimeout(() => {
        alert('Live chat would open here.\n\nThis would integrate with a service like Intercom, Zendesk Chat, or similar.');
    }, 1000);
});

document.getElementById('scheduleDemoBtn').addEventListener('click', () => {
    showToast('Opening demo scheduler...', 'success');
    // In a real app, this would open a calendar booking widget
    setTimeout(() => {
        alert('Demo scheduler would open here.\n\nThis would integrate with Calendly, Acuity Scheduling, or similar.');
    }, 1000);
});


// Navbar background on scroll
window.addEventListener('scroll', () => {
    const navbar = document.querySelector('.navbar');
    if (window.scrollY > 50) {
        navbar.style.background = 'rgba(255, 255, 255, 0.98)';
    } else {
        navbar.style.background = 'rgba(255, 255, 255, 0.95)';
    }
});

// Intersection Observer for animations
const observerOptions = {
    threshold: 0.1,
    rootMargin: '0px 0px -50px 0px'
};

const observer = new IntersectionObserver((entries) => {
    entries.forEach(entry => {
        if (entry.isIntersecting) {
            entry.target.style.opacity = '1';
            entry.target.style.transform = 'translateY(0)';
        }
    });
}, observerOptions);

// Observe elements for animation
document.querySelectorAll('.contact-card, .contact-detail, .faq-item').forEach(el => {
    el.style.opacity = '0';
    el.style.transform = 'translateY(30px)';
    el.style.transition = 'opacity 0.6s ease, transform 0.6s ease';
    observer.observe(el);
});

// Hero animation on load
window.addEventListener('load', () => {
    const heroTitle = document.querySelector('.hero-title');
    const heroSubtitle = document.querySelector('.hero-subtitle');

    [heroTitle, heroSubtitle].forEach((element, index) => {
        if (element) {
            element.style.opacity = '0';
            element.style.transform = 'translateY(30px)';
            element.style.transition = 'opacity 0.8s ease, transform 0.8s ease';

            setTimeout(() => {
                element.style.opacity = '1';
                element.style.transform = 'translateY(0)';
            }, 300 + (index * 200));
        }
    });
});

// Button click handlers
document.querySelectorAll('.btn').forEach(btn => {
    btn.addEventListener('click', (e) => {
        const buttonText = btn.textContent.toLowerCase();

        if (buttonText.includes('trial') || buttonText.includes('start')) {
            if (!btn.closest('form')) { // Don't interfere with form submission
                e.preventDefault();
                showToast('Starting your free trial! Redirecting...', 'success');
                setTimeout(() => {
                    window.location.href = 'signup.html';
                }, 2000);
            }
        }
    });
});

// Auto-resize textarea
messageTextarea.addEventListener('input', function() {
    this.style.height = 'auto';
    this.style.height = Math.min(this.scrollHeight, 200) + 'px';
});

// Phone number formatting (optional enhancement)
document.getElementById('phone').addEventListener('input', function(e) {
    let value = e.target.value.replace(/\D/g, '');
    if (value.length >= 6) {
        value = value.replace(/(\d{3})(\d{3})(\d{4})/, '($1) $2-$3');
    } else if (value.length >= 3) {
        value = value.replace(/(\d{3})(\d{0,3})/, '($1) $2');
    }
    e.target.value = value;
});