/**
 * Membership System Frontend
 * Handles authentication, paywall checks, and download tracking
 */

const getApiBase = () => {
    const host = window.location.hostname;
    const isLocal = host === 'localhost' || host === '127.0.0.1' || host.startsWith('10.');
    return isLocal ? 'http://' + host + ':5001' : window.location.origin.replace(/\/$/, '');
};
const API_BASE = getApiBase() + '/api';

let authState = {
    authenticated: false,
    user: null,
    token: null
};

// Initialize on page load
document.addEventListener('DOMContentLoaded', function() {
    checkAuthStatus();
    setupDownloadTracking();
    setupContactForm();
});

/**
 * Check authentication status
 */
async function checkAuthStatus() {
    const token = localStorage.getItem('membership_token');
    if (!token) {
        updateAuthUI(false);
        return;
    }

    try {
        const response = await fetch(`${API_BASE}/auth/check`, {
            headers: {
                'Authorization': `Bearer ${token}`
            }
        });

        const data = await response.json();
        if (data.authenticated) {
            authState = {
                authenticated: true,
                user: data,
                token: token
            };
            updateAuthUI(true);
            checkPaywallAccess();
        } else {
            localStorage.removeItem('membership_token');
            updateAuthUI(false);
        }
    } catch (error) {
        console.error('Auth check failed:', error);
        updateAuthUI(false);
    }
}

/**
 * Update UI based on authentication state
 */
function updateAuthUI(authenticated) {
    const loginElements = document.querySelectorAll('.membership-login');
    const logoutElements = document.querySelectorAll('.membership-logout');
    const memberElements = document.querySelectorAll('.membership-only');
    const guestElements = document.querySelectorAll('.guest-only');

    if (authenticated) {
        loginElements.forEach(el => el.style.display = 'none');
        logoutElements.forEach(el => el.style.display = 'block');
        memberElements.forEach(el => el.style.display = 'block');
        guestElements.forEach(el => el.style.display = 'none');

        // Update user name display
        const userNameElements = document.querySelectorAll('.user-name');
        userNameElements.forEach(el => {
            if (authState.user && authState.user.name) {
                el.textContent = authState.user.name;
            }
        });
    } else {
        loginElements.forEach(el => el.style.display = 'block');
        logoutElements.forEach(el => el.style.display = 'none');
        memberElements.forEach(el => el.style.display = 'none');
        guestElements.forEach(el => el.style.display = 'block');
    }
}

/**
 * Check paywall access and show/hide content
 */
async function checkPaywallAccess() {
    if (!authState.authenticated) {
        // Check download count for IP
        try {
            const response = await fetch(`${API_BASE}/download/count`);
            const data = await response.json();
            
            if (data.limit_reached || (data.count >= data.limit && !data.unlimited)) {
                showPaywall();
            }
        } catch (error) {
            console.error('Download count check failed:', error);
        }
    }
}

/**
 * Show paywall message
 */
function showPaywall() {
    const paywallElements = document.querySelectorAll('.paywall-message');
    paywallElements.forEach(el => {
        el.style.display = 'block';
    });

    const paywallContent = document.querySelectorAll('.paywall-content');
    paywallContent.forEach(el => {
        el.style.display = 'none';
    });
}

/**
 * Hide paywall message
 */
function hidePaywall() {
    const paywallElements = document.querySelectorAll('.paywall-message');
    paywallElements.forEach(el => {
        el.style.display = 'none';
    });

    const paywallContent = document.querySelectorAll('.paywall-content');
    paywallContent.forEach(el => {
        el.style.display = 'block';
    });
}

/**
 * Setup download tracking
 */
function setupDownloadTracking() {
    document.addEventListener('click', async function(e) {
        const downloadLink = e.target.closest('a[download], a[href*="/library/"], a[href*="/pdfs/"]');
        if (!downloadLink) return;

        const filePath = downloadLink.getAttribute('href') || downloadLink.getAttribute('download');
        if (!filePath) return;

        // Check if user is authenticated
        if (!authState.authenticated) {
            // Check download count
            try {
                const response = await fetch(`${API_BASE}/download/count`);
                const data = await response.json();

                if (data.count >= data.limit && !data.unlimited) {
                    e.preventDefault();
                    alert('You have reached the free download limit. Please sign up for membership to download unlimited resources.');
                    window.location.href = '/membership/';
                    return;
                }
            } catch (error) {
                console.error('Download check failed:', error);
            }
        }

        // Track download
        try {
            await fetch(`${API_BASE}/download/track`, {
                method: 'POST',
                headers: {
                    'Content-Type': 'application/json',
                    ...(authState.token ? { 'Authorization': `Bearer ${authState.token}` } : {})
                },
                body: JSON.stringify({ file_path: filePath })
            });
        } catch (error) {
            console.error('Download tracking failed:', error);
            // Don't prevent download if tracking fails
        }
    });
}

/**
 * Setup contact form
 */
function setupContactForm() {
    const contactForm = document.getElementById('contact-form');
    if (!contactForm) return;

    contactForm.addEventListener('submit', async function(e) {
        e.preventDefault();

        if (!authState.authenticated) {
            alert('Please log in to submit the contact form.');
            window.location.href = '/membership/';
            return;
        }

        const formData = new FormData(contactForm);
        const data = {
            name: formData.get('name'),
            email: formData.get('email'),
            message: formData.get('message')
        };

        try {
            const response = await fetch(`${API_BASE}/contact`, {
                method: 'POST',
                headers: {
                    'Content-Type': 'application/json',
                    'Authorization': `Bearer ${authState.token}`
                },
                body: JSON.stringify(data)
            });

            const result = await response.json();
            if (response.ok) {
                alert('Message sent successfully!');
                contactForm.reset();
            } else {
                alert(result.error || 'Failed to send message');
            }
        } catch (error) {
            console.error('Contact form error:', error);
            alert('Failed to send message. Please try again.');
        }
    });
}

/**
 * User login
 */
async function login(email, password) {
    try {
        const response = await fetch(`${API_BASE}/auth/login`, {
            method: 'POST',
            headers: {
                'Content-Type': 'application/json'
            },
            body: JSON.stringify({ email, password })
        });

        const data = await response.json();
        if (response.ok) {
            localStorage.setItem('membership_token', data.token);
            authState = {
                authenticated: true,
                user: data,
                token: data.token
            };
            updateAuthUI(true);
            hidePaywall();
            return { success: true };
        } else {
            return { success: false, error: data.error };
        }
    } catch (error) {
        return { success: false, error: 'Login failed. Please try again.' };
    }
}

/**
 * User logout
 */
async function logout() {
    const token = localStorage.getItem('membership_token');
    if (token) {
        try {
            await fetch(`${API_BASE}/auth/logout`, {
                method: 'POST',
                headers: {
                    'Authorization': `Bearer ${token}`
                }
            });
        } catch (error) {
            console.error('Logout error:', error);
        }
    }

    localStorage.removeItem('membership_token');
    authState = {
        authenticated: false,
        user: null,
        token: null
    };
    updateAuthUI(false);
    window.location.reload();
}

/**
 * User registration
 */
async function register(email, password, name) {
    try {
        const response = await fetch(`${API_BASE}/auth/register`, {
            method: 'POST',
            headers: {
                'Content-Type': 'application/json'
            },
            body: JSON.stringify({ email, password, name })
        });

        const data = await response.json();
        if (response.ok) {
            return { success: true, message: data.message };
        } else {
            return { success: false, error: data.error };
        }
    } catch (error) {
        return { success: false, error: 'Registration failed. Please try again.' };
    }
}

/**
 * Submit testimonial
 */
async function submitTestimonial(content, authorName) {
    if (!authState.authenticated) {
        return { success: false, error: 'Please log in to submit a testimonial' };
    }

    try {
        const response = await fetch(`${API_BASE}/testimonials`, {
            method: 'POST',
            headers: {
                'Content-Type': 'application/json',
                'Authorization': `Bearer ${authState.token}`
            },
            body: JSON.stringify({ content, author_name: authorName })
        });

        const data = await response.json();
        if (response.ok) {
            return { success: true, message: data.message };
        } else {
            return { success: false, error: data.error };
        }
    } catch (error) {
        return { success: false, error: 'Failed to submit testimonial' };
    }
}

/**
 * Load testimonials
 */
async function loadTestimonials() {
    try {
        const response = await fetch(`${API_BASE}/testimonials`);
        const data = await response.json();
        if (response.ok) {
            return { success: true, testimonials: data.testimonials };
        } else {
            return { success: false, error: data.error };
        }
    } catch (error) {
        return { success: false, error: 'Failed to load testimonials' };
    }
}

/**
 * Check if the user has reached their download limit (guests only)
 */
async function checkDownloadLimit() {
    if (authState.authenticated) {
        document.querySelectorAll('.paywall-message').forEach(el => el.style.display = 'none');
        document.querySelectorAll('.paywall-content').forEach(el => el.style.display = 'block');
        document.querySelectorAll('.guest-only').forEach(el => el.style.display = 'none');
        document.querySelectorAll('.membership-only').forEach(el => el.style.display = 'block');
        return;
    }

    try {
        const response = await fetch(`${API_BASE}/download/count`);
        const data = await response.json();
        
        if (data.count >= data.limit && !data.unlimited) {
            document.querySelectorAll('.paywall-message').forEach(el => el.style.display = 'block');
            document.querySelectorAll('.paywall-content').forEach(el => el.style.display = 'none');
        } else {
            document.querySelectorAll('.paywall-message').forEach(el => el.style.display = 'none');
            document.querySelectorAll('.paywall-content').forEach(el => el.style.display = 'block');
        }
    } catch (error) {
        console.error('Download limit check failed:', error);
    }
}

// Export functions for use in Alpine.js or other scripts
window.MembershipAPI = {
    login,
    logout,
    register,
    submitTestimonial,
    loadTestimonials,
    checkAuthStatus,
    checkDownloadLimit,
    getAuthState: () => authState
};