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<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>News Feed Hub</title>
    <style>
        body { font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif; margin: 20px; background-color: #f5f5f5; color: #333; }
        h1 { text-align: center; color: #2c3e50; }
        .search-container { text-align: center; margin: 20px 0; }
        .search-bar { width: 50%; padding: 10px; border: 2px solid #3498db; border-radius: 25px; margin-right: 10px; font-size: 1em; }
        .search-button { padding: 10px 20px; border: none; border-radius: 25px; background-color: #3498db; color: white; cursor: pointer; font-size: 1em; }
        .search-button:hover { background-color: #2980b9; }
        .category-section { margin: 20px 0; }
        .category-title { background-color: #3498db; color: white; padding: 10px; border-radius: 5px; cursor: pointer; user-select: none; }
        .tiles { display: grid; grid-template-columns: repeat(auto-fill, minmax(320px, 1fr)); gap: 20px; margin-top: 15px; }
        .article-tile {
            background: white;
            height: 380px;
            padding: 15px;
            border-radius: 8px;
            box-shadow: 0 2px 5px rgba(0,0,0,0.1);
            display: flex;
            flex-direction: column;
            overflow: hidden;
        }
        .article-tile img, .article-tile svg {
            width: 100%;
            height: 150px;
            object-fit: cover;
            border-radius: 5px;
            flex-shrink: 0;
        }
        .title { margin-top: 10px; }
        .title a { font-size: 1.2em; color: #2c3e50; text-decoration: none; font-weight: 600; }
        .title a:hover { color: #3498db; }
        .description {
            color: #555;
            font-size: 0.9em;
            flex-grow: 1;
            overflow-y: auto;
            margin-top: 8px;
            word-wrap: break-word;
        }
        .description p { margin: 0 0 0.5em 0; }
        .description a { color: #3498db; }
        .published { font-size: 0.8em; color: #95a5a6; margin-top: 8px; flex-shrink: 0; }
        .no-articles { text-align: center; color: #2c3e50; margin-top: 20px; }
        .loading-container { text-align: center; margin: 10px 0; }
        .loading-spinner { display: inline-block; vertical-align: middle; border: 4px solid #f3f3f3; border-top: 4px solid #3498db; border-radius: 50%; width: 20px; height: 20px; animation: spin 1s linear infinite; }
        @keyframes spin { 0% { transform: rotate(0deg); } 100% { transform: rotate(360deg); } }
    </style>
</head>
<body>
    <h1>News Feed Hub</h1>
    <div class="search-container">
      <form method="POST" action="/search" id="searchForm">
          <input type="text" name="search" class="search-bar" placeholder="Search semantically...">
          <button type="submit" class="search-button">Search</button>
      </form>
      <button id="backButton" style="display: none; margin-top: 10px;" class="search-button">Back to Main</button>
    </div>
    {% if loading %}
        <div class="loading-container" id="loadingContainer">
            <div class="loading-spinner"></div>
        </div>
    {% endif %}

    <div id="contentContainer">
        {% if has_articles %}
            {% for category, articles in categorized_articles.items() %}
            <div class="category-section">
                <div class="category-title" onclick="toggleCategory('{{ category }}')">{{ category }} <span class="loading-spinner" id="spinner-{{ category }}" style="display: none;"></span></div>
                <div class="tiles" id="category-{{ category }}">
                    {% for article in articles %}
                    <div class="article-tile" data-published="{{ article.published }}" data-key="{{ article.title + '|' + article.link + '|' + article.published }}">
                        {% if article.image != "svg" %}
                        <img src="{{ article.image }}" alt="Article Image" onerror="this.style.display='none';">
                        {% else %}
                        <svg width="100%" height="150" xmlns="http://www.w3.org/2000/svg">
                            <rect width="100%" height="100%" fill="#e0e0e0"/>
                            <text x="50%" y="50%" text-anchor="middle" dy=".3em" fill="#666">No Image</text>
                        </svg>
                        {% endif %}
                        <div class="title"><a href="{{ article.link }}" target="_blank">{{ article.title }}</a></div>
                        <div class="description">{{ article.description | safe }}</div>
                        <div class="published">Published: {{ article.published }}</div>
                    </div>
                    {% endfor %}
                </div>
                <div class="tiles" id="all-{{ category }}" style="display: none;"></div>
            </div>
            {% endfor %}
        {% else %}
            {% if not loading %}
            <div class="no-articles">No articles available yet. Loading new feeds...</div>
            {% endif %}
        {% endif %}
    </div>

    <script>
        let lastUpdate = 0;
        let expandedCategories = new Set();

        document.addEventListener('DOMContentLoaded', () => {
            const storedExpanded = sessionStorage.getItem('expandedCategories');
            if (storedExpanded) {
                expandedCategories = new Set(JSON.parse(storedExpanded));
                expandedCategories.forEach(category => {
                    const allTilesDiv = document.getElementById(`all-${category}`);
                    if (allTilesDiv) allTilesDiv.style.display = 'grid';
                });
            }

            if (document.getElementById('loadingContainer')) {
                checkLoadingStatus();
            }

            document.getElementById('searchForm').addEventListener('submit', handleSearch);
            document.getElementById('backButton').addEventListener('click', () => {
                window.location.href = '/';
            });
        });

        function getArticleKey(article) {
            return `${article.title}|${article.link}|${article.published}`;
        }

        function createArticleTileHTML(article) {
            const key = getArticleKey(article);
            const imageHTML = article.image !== "svg"
                ? `<img src="${article.image}" alt="Article Image" onerror="this.style.display='none';">`
                : `<svg width="100%" height="150" xmlns="http://www.w3.org/2000/svg">
                       <rect width="100%" height="100%" fill="#e0e0e0"/>
                       <text x="50%" y="50%" text-anchor="middle" dy=".3em" fill="#666">No Image</text>
                   </svg>`;

            return `
                <div class="article-tile" data-published="${article.published}" data-key="${key}">
                    ${imageHTML}
                    <div class="title"><a href="${article.link}" target="_blank">${article.title}</a></div>
                    <div class="description">${article.description}</div>
                    <div class="published">Published: ${article.published}</div>
                </div>`;
        }
        
        function renderArticles(container, articles) {
            container.innerHTML = articles.map(createArticleTileHTML).join('');
        }

        function toggleCategory(category) {
            const spinner = document.getElementById(`spinner-${category}`);
            const tilesDiv = document.getElementById(`category-${category}`);
            const allTilesDiv = document.getElementById(`all-${category}`);

            if (expandedCategories.has(category)) {
                allTilesDiv.style.display = 'none';
                expandedCategories.delete(category);
            } else {
                spinner.style.display = 'inline-block';
                fetch(`/get_all_articles/${category}`)
                    .then(response => response.json())
                    .then(data => {
                        spinner.style.display = 'none';
                        if (data.articles && data.articles.length > 0) {
                            renderArticles(allTilesDiv, data.articles);
                            allTilesDiv.style.display = 'grid';
                            expandedCategories.add(category);
                        } else {
                            alert(`No additional articles found for ${category}.`);
                        }
                    })
                    .catch(error => {
                        spinner.style.display = 'none';
                        console.error(`Error loading all articles for ${category}:`, error);
                    });
            }
            sessionStorage.setItem('expandedCategories', JSON.stringify([...expandedCategories]));
        }
        
        function handleSearch(event) {
            event.preventDefault();
            const form = event.target;
            const backButton = document.getElementById('backButton');
            const contentContainer = document.getElementById('contentContainer');
            const loadingContainer = document.getElementById('loadingContainer');
            if(loadingContainer) loadingContainer.style.display = 'block';
            contentContainer.innerHTML = '';


            fetch('/search', { method: 'POST', body: new FormData(form) })
                .then(response => response.json())
                .then(data => {
                    if(loadingContainer) loadingContainer.style.display = 'none';
                    if (data.has_articles) {
                        backButton.style.display = 'block';
                        let categoriesHtml = '';
                        const sortedCategories = Object.keys(data.categorized_articles).sort();
                        
                        for(const category of sortedCategories) {
                            const articles = data.categorized_articles[category];
                            categoriesHtml += `
                                <div class="category-section">
                                    <div class="category-title">${category} (${articles.length})</div>
                                    <div class="tiles">
                                        ${articles.map(createArticleTileHTML).join('')}
                                    </div>
                                </div>`;
                        }
                        contentContainer.innerHTML = categoriesHtml;
                    } else {
                        contentContainer.innerHTML = `<div class="no-articles">No results found.</div>`;
                    }
                })
                .catch(error => {
                    if(loadingContainer) loadingContainer.style.display = 'none';
                    console.error('Error performing search:', error);
                    contentContainer.innerHTML = `<div class="no-articles">Failed to perform search. Please try again.</div>`;
                });
        }

        function updateArticles() {
            fetch('/get_updates')
                .then(response => response.json())
                .then(data => {
                    if (data.has_updates) {
                        // For simplicity, a full refresh is the most reliable way to update
                        // without complex DOM manipulation and state management.
                        if (!document.querySelector('.search-bar').value) { // Only refresh if not in search view
                           console.log("New content available. Refreshing page.");
                           window.location.reload();
                        }
                    }
                })
                .catch(error => console.error('Error checking for updates:', error))
                .finally(() => setTimeout(updateArticles, 60000)); // Poll every 60 seconds
        }

        function checkLoadingStatus() {
            fetch('/check_loading')
                .then(response => response.json())
                .then(data => {
                    if (data.status === 'complete') {
                        const loadingContainer = document.getElementById('loadingContainer');
                        if (loadingContainer) loadingContainer.style.display = 'none';
                        // Start polling for updates only after initial load is complete
                        setTimeout(updateArticles, 5000);
                    } else {
                        setTimeout(checkLoadingStatus, 2000);
                    }
                })
                .catch(error => {
                    console.error('Error checking loading status:', error);
                    setTimeout(checkLoadingStatus, 5000);
                });
        }
    </script>
</body>
</html>