// Global state
let currentSearchResults = [];
let currentNewsSource = '';

// DOM Elements
const searchForm = document.getElementById('searchForm');
const searchInput = document.getElementById('searchInput');
const resultsSection = document.getElementById('resultsSection');
const newsSection = document.getElementById('newsSection');
const searchResults = document.getElementById('searchResults');
const newsResults = document.getElementById('newsResults');
const loading = document.getElementById('loading');
const backToSearch = document.getElementById('backToSearch');
const backToResults = document.getElementById('backToResults');
const newsTitle = document.getElementById('newsTitle');

// Event Listeners
document.addEventListener('DOMContentLoaded', function() {
    searchForm.addEventListener('submit', handleSearch);
    backToSearch.addEventListener('click', showSearchView);
    backToResults.addEventListener('click', showResultsView);
    
    // Focus search input on page load
    searchInput.focus();
});

// Search handler
async function handleSearch(e) {
    e.preventDefault();
    const query = searchInput.value.trim();
    
    if (!query) return;
    
    showLoading();
    hideAllSections();
    
    try {
        const results = await performSearch(query);
        currentSearchResults = results;
        displaySearchResults(results);
        showResultsSection();
    } catch (error) {
        console.error('Search error:', error);
        showError('Failed to perform search. Please try again.');
    } finally {
        hideLoading();
    }
}

// Perform search using DuckDuckGo Instant Answer API
async function performSearch(query) {
    const response = await fetch(`https://api.duckduckgo.com/?q=${encodeURIComponent(query)}&format=json&no_html=1&skip_disambig=1`);
    const data = await response.json();
    
    let results = [];
    
    // Use RelatedTopics if available
    if (data.RelatedTopics && data.RelatedTopics.length > 0) {
        results = data.RelatedTopics
            .filter(topic => topic.FirstURL && topic.Text)
            .map(topic => ({
                title: topic.Text,
                url: topic.FirstURL,
                description: topic.Text
            }))
            .slice(0, 10);
    }
    
    // Fallback to Abstract results
    if (results.length === 0 && data.Abstract) {
        results.push({
            title: data.Heading || query,
            url: data.AbstractURL || `https://duckduckgo.com/?q=${encodeURIComponent(query)}`,
            description: data.Abstract
        });
    }
    
    return results;
}

// Display search results
function displaySearchResults(results) {
    searchResults.innerHTML = '';
    
    if (results.length === 0) {
        searchResults.innerHTML = `
            <div class="text-center py-12">
                <i data-feather="search" class="w-16 h-16 text-gray-400 mx-auto mb-4"></i>
                <p class="text-gray-600 text-lg">No results found. Try a different search term.</p>
            </div>
        `;
        return;
    }
    
    results.forEach((result, index) => {
        const resultElement = document.createElement('div');
        resultElement.className = 'result-card bg-white rounded-xl p-6 fade-in';
        resultElement.style.animationDelay = `${index * 0.1}s`;
        
        resultElement.innerHTML = `
            <div class="flex items-start gap-4">
                <div class="flex-shrink-0 w-12 h-12 bg-gradient-to-br from-blue-100 to-purple-100 rounded-lg flex items-center justify-center">
                    <i data-feather="globe" class="w-6 h-6 text-blue-600"></i>
                </div>
                <div class="flex-grow">
                    <h3 class="font-semibold text-lg text-gray-800 mb-2">${result.title}</h3>
                    <p class="text-gray-600 mb-3 line-clamp-2">${result.description}</p>
                    <div class="flex justify-between items-center">
                        <span class="text-sm text-gray-500 truncate">${result.url}</span>
                        <button class="view-news-btn bg-blue-600 text-white px-4 py-2 rounded-lg text-sm hover:bg-blue-700 transition-colors duration-200 flex items-center gap-2" data-url="${result.url}">
                            <i data-feather="newspaper" class="w-4 h-4"></i>
                            Get News
                        </button>
                    </div>
                </div>
            </div>
        `;
        
        searchResults.appendChild(resultElement);
    });
    
    // Add event listeners to news buttons
    document.querySelectorAll('.view-news-btn').forEach(button => {
        button.addEventListener('click', function() {
            const url = this.getAttribute('data-url');
            loadNewsForSource(url);
        });
    });
    
    feather.replace();
}

// Load news for a specific source
async function loadNewsForSource(url) {
    showLoading();
    hideAllSections();
    
    try {
        // Extract domain from URL
        const domain = new URL(url).hostname.replace('www.', '');
        currentNewsSource = domain;
        
        // Use NewsAPI free tier (requires registration but has free tier)
        // For demo purposes, we'll use a mock news API that doesn't require keys
        const news = await fetchNewsForDomain(domain);
        displayNewsResults(news, domain);
        showNewsSection();
    } catch (error) {
        console.error('News loading error:', error);
        showError('Failed to load news. The source might not be supported.');
    } finally {
        hideLoading();
    }
}

// Fetch news for domain (mock implementation)
async function fetchNewsForDomain(domain) {
    // In a real implementation, you would use NewsAPI or similar service
    // For demo, we'll return mock data
    await new Promise(resolve => setTimeout(resolve, 1000));
    
    const mockNews = Array.from({ length: 20 }, (_, i) => ({
        title: `Breaking News ${i + 1} from ${domain}`,
        description: `This is a sample news article from ${domain}. In a real implementation, this would fetch actual news from the domain.`,
        url: `https://${domain}/news/${i + 1}`,
        publishedAt: new Date(Date.now() - i * 3600000).toISOString(),
        author: `Staff Writer ${i + 1}`,
        source: domain
    }));
    
    return mockNews;
}

// Display news results
function displayNewsResults(news, domain) {
    newsTitle.textContent = `Latest News from ${domain}`;
    newsResults.innerHTML = '';
    
    news.forEach((article, index) => {
        const articleElement = document.createElement('div');
        articleElement.className = 'news-card bg-white rounded-xl p-6 fade-in';
        articleElement.style.animationDelay = `${index * 0.05}s`;
        
        const date = new Date(article.publishedAt).toLocaleDateString();
        
        articleElement.innerHTML = `
            <div class="h-full flex flex-col">
                <h3 class="font-semibold text-lg text-gray-800 mb-3 line-clamp-2">${article.title}</h3>
                <p class="text-gray-600 mb-4 flex-grow line-clamp-3">${article.description}</p>
                <div class="flex justify-between items-center text-sm text-gray-500 mt-auto">
                    <span>${article.author}</span>
                    <span>${date}</span>
                </div>
                <a href="${article.url}" target="_blank" class="mt-4 inline-flex items-center gap-2 text-blue-600 hover:text-blue-800 transition-colors duration-200">
                    Read Full Article
                    <i data-feather="external-link" class="w-4 h-4"></i>
                </a>
            </div>
        `;
        
        newsResults.appendChild(articleElement);
    });
    
    feather.replace();
}

// UI State Management
function showLoading() {
    loading.classList.remove('hidden');
}

function hideLoading() {
    loading.classList.add('hidden');
}

function showResultsSection() {
    resultsSection.classList.remove('hidden');
}

function showNewsSection() {
    newsSection.classList.remove('hidden');
}

function hideAllSections() {
    resultsSection.classList.add('hidden');
    newsSection.classList.add('hidden');
}

function showSearchView() {
    hideAllSections();
    searchInput.focus();
}

function showResultsView() {
    hideAllSections();
    showResultsSection();
}

function showError(message) {
    hideAllSections();
    searchResults.innerHTML = `
        <div class="text-center py-12">
            <i data-feather="alert-triangle" class="w-16 h-16 text-red-400 mx-auto mb-4"></i>
        <p class="text-red-600 text-lg">${message}</p>
        </div>
    `;
    showResultsSection();
    feather.replace();
}

// Utility function to extract domain from URL
function extractDomain(url) {
    try {
        return new URL(url).hostname.replace('www.', '');
    } catch {
        return url;
    }
}