Idea Board Web Application

// Real-time collaboration with conflict resolution
class IdeaBoard {
    constructor() {
        this.firestore = firebase.firestore();
        this.ideas = [];
        this.listeners = new Map();
        this.init();
    }
    
    init() {
        // Listen for real-time updates
        this.firestore.collection('ideas')
            .onSnapshot((snapshot) => {
                snapshot.docChanges().forEach((change) => {
                    if (change.type === 'added') {
                        this.addIdea(change.doc.data());
                    } else if (change.type === 'modified') {
                        this.updateIdea(change.doc.id, change.doc.data());
                    } else if (change.type === 'removed') {
                        this.removeIdea(change.doc.id);
                    }
                });
            });
    }
    
    addIdea(ideaData) {
        const idea = {
            id: ideaData.id,
            title: ideaData.title,
            description: ideaData.description,
            category: ideaData.category,
            timestamp: ideaData.timestamp,
            author: ideaData.author
        };
        
        this.ideas.push(idea);
        this.renderIdeas();
    }
    
    updateIdea(id, updates) {
        const index = this.ideas.findIndex(idea => idea.id === id);
        if (index !== -1) {
            this.ideas[index] = { ...this.ideas[index], ...updates };
            this.renderIdeas();
        }
    }
    
    removeIdea(id) {
        this.ideas = this.ideas.filter(idea => idea.id !== id);
        this.renderIdeas();
    }
    
    renderIdeas() {
        const container = document.getElementById('ideas-container');
        container.innerHTML = '';
        
        this.ideas.forEach(idea => {
            const ideaElement = this.createIdeaElement(idea);
            container.appendChild(ideaElement);
        });
    }
}

/* Responsive design with Tailwind CSS */
.idea-card {
    @apply bg-white rounded-lg shadow-md p-4 mb-4;
    @apply transition-all duration-200 ease-in-out;
    @apply hover:shadow-lg hover:transform hover:-translate-y-1;
}

.idea-grid {
    @apply grid gap-4;
    @apply grid-cols-1;
    @apply sm:grid-cols-2;
    @apply lg:grid-cols-3;
    @apply xl:grid-cols-4;
}

.idea-input {
    @apply w-full px-4 py-3 border border-gray-300 rounded-lg;
    @apply focus:ring-2 focus:ring-blue-500 focus:border-transparent;
    @apply transition-all duration-200;
    @apply placeholder-gray-400;
}

/* Mobile-specific optimizations */
@media (max-width: 768px) {
    .idea-card {
        @apply p-3 mb-3;
    }
    
    .idea-input {
        @apply text-base py-4; /* Larger touch targets */
    }
    
    .floating-action-button {
        @apply bottom-6 right-6;
        @apply w-14 h-14;
        @apply text-2xl;
    }
}

// Performance optimization with virtual scrolling
class VirtualizedIdeaList {
    constructor(container, itemHeight = 120) {
        this.container = container;
        this.itemHeight = itemHeight;
        this.visibleItems = 10;
        this.scrollTop = 0;
        this.ideas = [];
        this.init();
    }
    
    init() {
        this.container.addEventListener('scroll', this.handleScroll.bind(this));
        this.render();
    }
    
    handleScroll(event) {
        this.scrollTop = event.target.scrollTop;
        this.render();
    }
    
    render() {
        const startIndex = Math.floor(this.scrollTop / this.itemHeight);
        const endIndex = Math.min(startIndex + this.visibleItems, this.ideas.length);
        
        // Clear container
        this.container.innerHTML = '';
        
        // Add spacer for scroll position
        const topSpacer = document.createElement('div');
        topSpacer.style.height = `${startIndex * this.itemHeight}px`;
        this.container.appendChild(topSpacer);
        
        // Render visible items
        for (let i = startIndex; i < endIndex; i++) {
            const ideaElement = this.createIdeaElement(this.ideas[i]);
            this.container.appendChild(ideaElement);
        }
        
        // Add bottom spacer
        const bottomSpacer = document.createElement('div');
        bottomSpacer.style.height = `${(this.ideas.length - endIndex) * this.itemHeight}px`;
        this.container.appendChild(bottomSpacer);
    }
    
    createIdeaElement(idea) {
        const element = document.createElement('div');
        element.className = 'idea-item';
        element.style.height = `${this.itemHeight}px`;
        element.innerHTML = `
            
${idea.title}
            
${idea.description}
            ${idea.category}
        `;
        return element;
    }
}