// User management
let currentUser = null;
const users = JSON.parse(localStorage.getItem('users')) || [];
const posts = JSON.parse(localStorage.getItem('posts')) || [];

// Initialize auth forms
function initAuthForms() {
    const loginForm = document.getElementById('login-form');
    const registerForm = document.getElementById('register-form');
    const showRegister = document.getElementById('show-register');
    const showLogin = document.getElementById('show-login');

    if (loginForm && registerForm && showRegister && showLogin) {
        showRegister.addEventListener('click', (e) => {
            e.preventDefault();
            loginForm.classList.add('hidden');
            registerForm.classList.remove('hidden');
}
function showCommentModal(post) {
    const modal = document.createElement('div');
    modal.className = 'fixed inset-0 bg-black bg-opacity-50 flex items-center justify-center z-50';
    modal.innerHTML = `
        <div class="bg-white rounded-lg w-full max-w-lg max-h-[90vh] flex flex-col">
            <div class="p-4 border-b flex items-center justify-between">
                <h3 class="text-lg font-semibold">Comments</h3>
                <button class="text-gray-500 hover:text-gray-700" id="close-comment-modal">
                    <i data-feather="x"></i>
                </button>
            </div>
            <div class="p-4 border-b">
                <div class="flex items-start">
                    <img src="${post.user.avatar}" class="w-8 h-8 rounded-full">
                    <div class="ml-3">
                        <div class="flex items-center">
                            <span class="font-medium">${post.user.name}</span>
                            <span class="mx-1 text-gray-500">•</span>
                            <span class="text-gray-500 text-sm">${post.timestamp}</span>
                        </div>
                        <p class="mt-1">${post.content}</p>
                    </div>
                </div>
            </div>
            <div class="flex-1 overflow-y-auto p-4 space-y-4" id="comments-container">
                ${post.comments > 0 ? '' : `
                <div class="text-center py-8">
                    <i data-feather="message-circle" class="w-12 h-12 mx-auto text-gray-300"></i>
                    <p class="mt-2 text-gray-500">No comments yet</p>
                    <p class="text-sm text-gray-400">Be the first to share your thoughts!</p>
                </div>
                `}
            </div>
            <div class="p-4 border-t">
                <div class="flex items-center">
                    <img src="http://static.photos/people/200x200/1" class="w-8 h-8 rounded-full">
                    <div class="ml-2 flex-1 flex items-center bg-gray-100 rounded-full">
                        <input type="text" placeholder="Add a comment..." class="flex-1 bg-transparent px-4 py-2 focus:outline-none" id="comment-input">
                        <button class="text-blue-500 px-3" id="post-comment">
                            <i data-feather="send" class="w-5 h-5"></i>
                        </button>
                    </div>
                </div>
            </div>
        </div>
    `;
document.body.appendChild(modal);
    feather.replace();

    document.getElementById('close-comment-modal').addEventListener('click', () => {
        modal.remove();
    });

    document.getElementById('post-comment').addEventListener('click', () => {
        const commentInput = document.getElementById('comment-input');
        const comment = commentInput.value.trim();
        if (comment) {
            // In a real app, you would save the comment
            alert(`Comment posted: ${comment}`);
            commentInput.value = '';
        }
    });
}
function showShareOptions(post) {
    const modal = document.createElement('div');
    modal.className = 'fixed inset-0 bg-black bg-opacity-50 flex items-center justify-center z-50';
    modal.innerHTML = `
        <div class="bg-white rounded-lg w-full max-w-sm">
            <div class="p-4 border-b">
                <h3 class="text-lg font-semibold">Share Post</h3>
            </div>
            <div class="p-4 space-y-2">
                <button class="w-full flex items-center px-4 py-3 rounded-lg hover:bg-gray-100">
                    <div class="w-10 h-10 rounded-full bg-blue-100 flex items-center justify-center text-blue-500">
                        <i data-feather="user-plus" class="w-5 h-5"></i>
                    </div>
                    <div class="ml-4 text-left">
                        <p class="font-medium">Send in a message</p>
                        <p class="text-sm text-gray-500">Share privately with friends</p>
                    </div>
                </button>
                <button class="w-full flex items-center px-4 py-3 rounded-lg hover:bg-gray-100">
                    <div class="w-10 h-10 rounded-full bg-green-100 flex items-center justify-center text-green-500">
                        <i data-feather="twitter" class="w-5 h-5"></i>
                    </div>
                    <div class="ml-4 text-left">
                        <p class="font-medium">Share on Twitter</p>
                        <p class="text-sm text-gray-500">Post to Twitter</p>
                    </div>
                </button>
                <button class="w-full flex items-center px-4 py-3 rounded-lg hover:bg-gray-100">
                    <div class="w-10 h-10 rounded-full bg-blue-100 flex items-center justify-center text-blue-500">
                        <i data-feather="facebook" class="w-5 h-5"></i>
                    </div>
                    <div class="ml-4 text-left">
                        <p class="font-medium">Share on Facebook</p>
                        <p class="text-sm text-gray-500">Post to Facebook</p>
                    </div>
                </button>
                <button class="w-full flex items-center px-4 py-3 rounded-lg hover:bg-gray-100">
                    <div class="w-10 h-10 rounded-full bg-purple-100 flex items-center justify-center text-purple-500">
                        <i data-feather="link" class="w-5 h-5"></i>
                    </div>
                    <div class="ml-4 text-left">
                        <p class="font-medium">Copy link</p>
                        <p class="text-sm text-gray-500">Copy post link</p>
                    </div>
                </button>
            </div>
            <div class="p-4 border-t">
                <button id="close-share-modal" class="w-full py-2 text-gray-700 rounded-lg hover:bg-gray-100">
                    Cancel
                </button>
            </div>
        </div>
    `;
document.body.appendChild(modal);
    feather.replace();

    document.getElementById('close-share-modal').addEventListener('click', () => {
        modal.remove();
    });

    modal.querySelectorAll('button').forEach(btn => {
        if (btn.id !== 'close-share-modal') {
            btn.addEventListener('click', () => {
                alert(`Post shared via ${btn.textContent.trim()}`);
                modal.remove();
            });
        }
    });
}
);

        showLogin.addEventListener('click', (e) => {
            e.preventDefault();
            registerForm.classList.add('hidden');
            loginForm.classList.remove('hidden');
        });

        loginForm.addEventListener('submit', (e) => {
            e.preventDefault();
            const email = document.getElementById('login-email').value;
            const password = document.getElementById('login-password').value;
            loginUser(email, password);
        });

        registerForm.addEventListener('submit', (e) => {
            e.preventDefault();
            const name = document.getElementById('register-name').value;
            const username = document.getElementById('register-username').value;
            const email = document.getElementById('register-email').value;
            const password = document.getElementById('register-password').value;
            registerUser(name, username, email, password);
        });
    }
}

function loginUser(email, password) {
    const user = users.find(u => u.email === email && u.password === password);
    if (user) {
        currentUser = user;
        localStorage.setItem('currentUser', JSON.stringify(user));
        window.location.href = '/';
    } else {
        alert('Invalid credentials');
    }
}

function registerUser(name, username, email, password) {
    if (users.some(u => u.email === email)) {
        alert('Email already registered');
        return;
    }
    if (users.some(u => u.username === username)) {
        alert('Username already taken');
        return;
    }

    const newUser = {
        id: Date.now(),
        name,
        username,
        email,
        password,
        avatar: `http://static.photos/people/200x200/${Math.floor(Math.random() * 100)}`,
        followers: [],
        following: []
    };

    users.push(newUser);
    localStorage.setItem('users', JSON.stringify(users));
    currentUser = newUser;
    localStorage.setItem('currentUser', JSON.stringify(newUser));
    window.location.href = '/';
}

function logoutUser() {
    currentUser = null;
    localStorage.removeItem('currentUser');
    window.location.href = '/auth.html';
}

// Post management
function createPost(content, image = null) {
    const newPost = {
        id: Date.now(),
        user: {
            name: currentUser.name,
            username: currentUser.username,
            avatar: currentUser.avatar
        },
        content,
        image,
        timestamp: 'Just now',
        likes: 0,
        comments: 0,
        shares: 0,
        isLiked: false,
        isSaved: false
    };

    posts.unshift(newPost);
    localStorage.setItem('posts', JSON.stringify(posts));
    return newPost;
}

// Sample data for posts if none exists
if (posts.length === 0) {
    const samplePosts = [
        {
            id: 1,
user: {
            name: "Sarah Johnson",
            username: "@sarahj",
            avatar: "http://static.photos/people/200x200/4"
        },
        content: "Just launched my new portfolio website! Built with React and TailwindCSS. Check it out and let me know what you think! 🚀",
        image: "http://static.photos/technology/640x360/5",
        timestamp: "2 hours ago",
        likes: 245,
        comments: 32,
        shares: 12,
        isLiked: false,
        isSaved: false
    },
    {
        id: 2,
        user: {
            name: "Tech Insights",
            username: "@techinsights",
            avatar: "http://static.photos/technology/200x200/6"
        },
        content: "Breaking: New AI model achieves human-level performance on complex reasoning tasks. This could revolutionize how we approach problem-solving in tech. #AI #MachineLearning",
        timestamp: "4 hours ago",
        likes: 1240,
        comments: 87,
        shares: 210,
        isLiked: true,
        isSaved: false
    },
    {
        id: 3,
        user: {
            name: "Design Daily",
            username: "@designdaily",
            avatar: "http://static.photos/abstract/200x200/7"
        },
        content: "Color theory tip: Use the 60-30-10 rule for balanced designs. 60% dominant color, 30% secondary, 10% accent. This creates visual harmony without overwhelming the viewer.",
        image: "http://static.photos/design/640x360/8",
        timestamp: "6 hours ago",
        likes: 562,
        comments: 24,
        shares: 42,
        isLiked: false,
        isSaved: true
    },
    {
        id: 4,
        user: {
            name: "Alex Morgan",
            username: "@alexmorgan",
            avatar: "http://static.photos/people/200x200/1"
        },
        content: "Working on a new project that combines blockchain with social media. Excited to share more details soon! #Web3 #Blockchain",
        timestamp: "1 day ago",
        likes: 87,
        comments: 15,
        shares: 9,
        isLiked: true,
        isSaved: false
    }
];

// Track viewed posts to avoid reshowing
let viewedPosts = new Set();
let currentPosts = [];

// Initialize the feed
document.addEventListener('DOMContentLoaded', function() {
    // Initialize auth forms if on auth page
    initAuthForms();

    // Check if user is logged in
    const storedUser = localStorage.getItem('currentUser');
    if (storedUser) {
        currentUser = JSON.parse(storedUser);
    } else if (window.location.pathname !== '/auth.html') {
        window.location.href = '/auth.html';
        return;
    }

    // Initialize UI if on main page
    if (document.getElementById('feed-container')) {
        loadPosts();
        
        // Load more button event
        document.getElementById('load-more').addEventListener('click', loadPosts);

        // Post creation form
        const postForm = document.getElementById('post-form');
        if (postForm) {
            postForm.addEventListener('submit', (e) => {
                e.preventDefault();
                const content = document.getElementById('post-content').value;
                const image = document.getElementById('post-image').files[0];
                
                if (content.trim() === '') return;
                
                if (image) {
                    const reader = new FileReader();
                    reader.onload = (e) => {
                        const newPost = createPost(content, e.target.result);
                        prependPost(newPost);
                    };
                    reader.readAsDataURL(image);
                } else {
                    const newPost = createPost(content);
                    prependPost(newPost);
                }
                
                postForm.reset();
            });
        }

        // Add logout functionality
        const logoutBtn = document.getElementById('logout-btn');
        if (logoutBtn) {
            logoutBtn.addEventListener('click', logoutUser);
        }
    }
});
// Load posts into the feed
function loadPosts() {
    const feedContainer = document.getElementById('feed-container');
    
    // Get posts from local storage
    const storedPosts = JSON.parse(localStorage.getItem('posts')) || [];
    
    // Filter out already viewed posts
    const newPosts = storedPosts.filter(post => !viewedPosts.has(post.id));
// If no new posts, show message
    if (newPosts.length === 0) {
        if (feedContainer.children.length === 0) {
            feedContainer.innerHTML = `
                <div class="p-8 text-center">
                    <i data-feather="coffee" class="w-12 h-12 mx-auto text-gray-400"></i>
                    <h3 class="mt-4 text-lg font-medium">No new posts</h3>
                    <p class="mt-1 text-gray-500">You've seen all recent posts. Check back later for more!</p>
                </div>
            `;
            feather.replace();
        } else {
            document.getElementById('load-more').textContent = "No more posts";
            document.getElementById('load-more').disabled = true;
        }
        return;
    }
    
    // Take first 2 new posts
    const postsToShow = newPosts.slice(0, 2);
    
    postsToShow.forEach(post => {
        // Mark as viewed
        viewedPosts.add(post.id);
        currentPosts.push(post);
        
        // Create post element
        const postElement = document.createElement('div');
        postElement.className = 'post-card bg-white border-b last:border-b-0 fade-in';
        postElement.innerHTML = `
            <div class="p-6">
                <div class="flex items-start">
                    <img src="${post.user.avatar}" alt="${post.user.name}" class="w-12 h-12 rounded-full user-avatar">
                    <div class="ml-4 flex-1">
                        <div class="flex items-center">
                            <h3 class="font-bold">${post.user.name}</h3>
                            <span class="ml-2 text-gray-500 text-sm">${post.user.username}</span>
                            <span class="mx-2 text-gray-300">•</span>
                            <span class="text-gray-500 text-sm">${post.timestamp}</span>
                        </div>
                        <p class="mt-2 post-content">${post.content}</p>
                        ${post.image ? `<img src="${post.image}" alt="Post image" class="mt-4 rounded-xl w-full">` : ''}
                        <div class="mt-4 flex space-x-6">
                            <button class="interaction-btn ${post.isLiked ? 'active' : ''}" data-action="like" data-id="${post.id}">
                                <i data-feather="heart" class="w-4 h-4"></i>
                                <span>${post.likes}</span>
                            </button>
                            <button class="interaction-btn" data-action="comment" data-id="${post.id}">
                                <i data-feather="message-circle" class="w-4 h-4"></i>
                                <span>${post.comments}</span>
                            </button>
                            <button class="interaction-btn" data-action="share" data-id="${post.id}">
                                <i data-feather="share-2" class="w-4 h-4"></i>
                                <span>${post.shares}</span>
                            </button>
                            <button class="interaction-btn ml-auto ${post.isSaved ? 'active' : ''}" data-action="save" data-id="${post.id}">
                                <i data-feather="bookmark" class="w-4 h-4"></i>
                            </button>
                        </div>
                    </div>
                </div>
            </div>
        `;
        
        feedContainer.appendChild(postElement);
    });
    
    // Reinitialize Feather icons
    feather.replace();
    
    // Add event listeners to new buttons
    document.querySelectorAll('.interaction-btn').forEach(button => {
        button.addEventListener('click', handleInteraction);
    });
}

// Handle post interactions
function prependPost(post) {
    const feedContainer = document.getElementById('feed-container');
    const firstChild = feedContainer.firstChild;
    
    const postElement = createPostElement(post);
    
    if (firstChild) {
        feedContainer.insertBefore(postElement, firstChild);
    } else {
        feedContainer.appendChild(postElement);
    }
    
    viewedPosts.add(post.id);
    currentPosts.unshift(post);
    feather.replace();
}
function createPostElement(post) {
    const postElement = document.createElement('div');
    postElement.className = 'post-card fade-in p-4';
    postElement.innerHTML = `
        <div class="flex items-start">
            <img src="${post.user.avatar}" alt="${post.user.name}" class="w-10 h-10 rounded-full user-avatar">
            <div class="ml-3 flex-1">
                <div class="flex items-center">
                    <h3 class="font-bold">${post.user.name}</h3>
                    <span class="mx-2 text-gray-300">•</span>
                    <span class="text-gray-500 text-sm">${post.timestamp}</span>
                    <button class="ml-auto text-gray-400 hover:text-gray-600">
                        <i data-feather="more-horizontal"></i>
                    </button>
                </div>
                <p class="mt-2 post-content">${post.content}</p>
                ${post.image ? `
                <div class="mt-3 rounded-xl overflow-hidden border">
                    <img src="${post.image}" alt="Post image" class="w-full">
                </div>
                ` : ''}
                <div class="flex justify-between mt-3 pt-3 border-t">
                    <button class="interaction-btn ${post.isLiked ? 'active' : ''}" data-action="like" data-id="${post.id}">
                        <i data-feather="heart" class="w-5 h-5"></i>
                        <span>${post.likes}</span>
                    </button>
                    <button class="interaction-btn" data-action="comment" data-id="${post.id}">
                        <i data-feather="message-circle" class="w-5 h-5"></i>
                        <span>${post.comments}</span>
                    </button>
                    <button class="interaction-btn" data-action="share" data-id="${post.id}">
                        <i data-feather="share-2" class="w-5 h-5"></i>
                    </button>
                    <button class="interaction-btn ml-auto ${post.isSaved ? 'active' : ''}" data-action="save" data-id="${post.id}">
                        <i data-feather="bookmark" class="w-5 h-5"></i>
                    </button>
                </div>
            </div>
        </div>
    `;
return postElement;
}

function handleInteraction(e) {
    const button = e.currentTarget;
    const action = button.getAttribute('data-action');
    const postId = parseInt(button.getAttribute('data-id'));
    
    // Find the post in storage
    const storedPosts = JSON.parse(localStorage.getItem('posts')) || [];
    const postIndex = storedPosts.findIndex(p => p.id === postId);
if (!post) return;
    
    // Update UI based on action
    switch(action) {
        case 'like':
            if (button.classList.contains('active')) {
                button.classList.remove('active');
                post.likes--;
                post.isLiked = false;
            } else {
                button.classList.add('active');
                post.likes++;
                post.isLiked = true;
            }
            button.querySelector('span').textContent = post.likes;
            break;
            
        case 'save':
            if (button.classList.contains('active')) {
                button.classList.remove('active');
                post.isSaved = false;
            } else {
                button.classList.add('active');
                post.isSaved = true;
            }
            break;
            
        case 'comment':
            // In a real app, this would open comment section
            // Update storage
            storedPosts[postIndex] = post;
            localStorage.setItem('posts', JSON.stringify(storedPosts));
            
            // Update current posts
            const currentPostIndex = currentPosts.findIndex(p => p.id === postId);
            if (currentPostIndex !== -1) {
                currentPosts[currentPostIndex] = post;
            }
            
            // Show comment modal
            showCommentModal(post);
break;
            
        case 'share':
            // In a real app, this would open share options
            // Update storage
            storedPosts[postIndex] = post;
            localStorage.setItem('posts', JSON.stringify(storedPosts));
            
            // Show share options
            showShareOptions(post);
break;
    }
}