document.addEventListener('DOMContentLoaded', function() {
    const searchButton = document.getElementById('searchButton');
    const searchQuery = document.getElementById('searchQuery');
        const databaseCheckboxes = document.querySelectorAll('input[name="database"]');
        let timeRange, sortBy;
        
        function getSelectedFilters() {
            timeRange = document.querySelector('input[name="timeRange"]:checked').value;
            sortBy = document.querySelector('input[name="sortBy"]:checked').value;
        }
const loadingSpinner = document.getElementById('loadingSpinner');
    const resultsContainer = document.getElementById('resultsContainer');
    const noResults = document.getElementById('noResults');
    const resultCount = document.getElementById('resultCount');
    const articleList = document.getElementById('articleList');
    const constellation = d3.select('#constellation');
    const tooltip = document.getElementById('tooltip');

    // Search function
    searchButton.addEventListener('click', performSearch);
    searchQuery.addEventListener('keypress', function(e) {
        if (e.key === 'Enter') performSearch();
    });
    function performSearch() {
        const query = searchQuery.value.trim();
        if (!query) return;

        getSelectedFilters();
        showLoading(true);
        simulateAPICall(query);
    }
function showLoading(show) {
        loadingSpinner.classList.toggle('hidden', !show);
        resultsContainer.classList.add('hidden');
        noResults.classList.add('hidden');
    }
    function simulateAPICall(query) {
        // In a real implementation, this would call actual APIs
        setTimeout(() => {
            try {
                // Always generate results for debugging
                const mockData = generateMockData(query);
                console.log("Generated mock data:", mockData);
                
                // Force display results even with empty query for testing
                if (mockData.length > 0) {
                    displayResults(mockData);
                } else {
                    // If no mock data, still show something for testing
                    const fallbackData = generateMockData("médecine");
                    displayResults(fallbackData);
                }
            } catch (error) {
                console.error("Error displaying results:", error);
                // Show fallback results instead of no results
                const fallbackData = generateMockData("médecine");
                displayResults(fallbackData);
            } finally {
                showLoading(false);
            }
        }, 500);
    }
function generateMockData(query) {
        const yearsFilter = timeRange;
const count = 15 + Math.floor(Math.random() * 20);
        const currentYear = new Date().getFullYear();
        
        const articles = [];
        const centralArticleCitations = 200 + Math.floor(Math.random() * 300);
        
        // Generate central article
        articles.push({
                title: `L'étude la plus influente sur ${query} ces dernières années`,
                authors: "Dupont, J.; Martin, A.; Leroy, K. et al.",
journal: "Nature Medicine",
            year: currentYear - Math.floor(Math.random() * (yearsFilter === 'all' ? 20 : parseInt(yearsFilter))),
            citations: centralArticleCitations,
            doi: "10.1038/nm.1234",
                abstract: `Cette étude révolutionnaire a transformé notre compréhension de ${query} en démontrant des améliorations significatives des résultats pour les patients. L'équipe de recherche a employé des méthodologies innovantes qui sont depuis devenues standard dans le domaine.`
});
        
        // Generate surrounding articles
        for (let i = 0; i < count - 1; i++) {
            const citationCount = Math.floor(Math.random() * centralArticleCitations * 0.8);
            
            articles.push({
                title: `Étude ${i+1} sur ${query}: ${['Nouvelle', 'Complète', 'Systématique', 'Randomisée', 'Clinique'][i%5]} ${['découverte', 'analyse', 'étude', 'revue', 'évaluation'][i%5]}`,
                authors: `${['Dubois', 'Bernard', 'Petit', 'Moreau', 'Lefevre'][i%5]}, ${String.fromCharCode(65 + (i%26))}. et al.`,
                journal: ["La Presse Médicale", "NEJM", "The Lancet", "BMJ", "Annales"][i%5],
year: currentYear - Math.floor(Math.random() * (yearsFilter === 'all' ? 20 : parseInt(yearsFilter))),
                citations: citationCount,
                doi: `10.1234/abcd.${1000 + i}`,
                abstract: `Cette étude ${['importante', 'fondamentale', 'innovante', 'détaillée', 'approfondie'][i%5]} a examiné ${query} à travers l'analyse ${['clinique', 'épidémiologique', 'moléculaire', 'biochimique', 'génomique'][i%5]}. Les résultats ont ${['confirmé', 'remis en question', 'élargi', 'affiné', 'redéfini'][i%5]} les connaissances précédentes dans ce domaine.`
});
        }
        
        return articles;
    }

    function displayResults(articles) {
        // Sort articles by citations
        articles.sort((a, b) => b.citations - a.citations);
        
        // Update result count
                resultCount.textContent = `${articles.length} articles de recherche trouvés`;
// Create constellation visualization
        createConstellation(articles);
        
        // Create article list
        renderArticleList(articles);
        
        // Show results
        resultsContainer.classList.remove('hidden');
    }

    function createConstellation(articles) {
        const width = constellation.node().clientWidth;
        const height = constellation.node().clientHeight;
        const center = { x: width / 2, y: height / 2 };
        
        // Clear previous visualization
        constellation.selectAll("*").remove();
        
        // Create simulation
        const simulation = d3.forceSimulation()
            .force("link", d3.forceLink().id(d => d.id).distance(100))
            .force("charge", d3.forceManyBody().strength(-100))
            .force("x", d3.forceX(center.x).strength(0.1))
            .force("y", d3.forceY(center.y).strength(0.1));
        
        // Prepare nodes data
        const nodes = articles.map((article, i) => ({
            id: i,
            ...article,
            r: Math.sqrt(article.citations) / 3,
            isCentral: i === 0
        }));
        
        // Create links (central node connects to all others)
        const links = nodes.slice(1).map(node => ({
            source: 0,
            target: node.id,
            value: node.citations / nodes[0].citations
        }));
        
        // Draw links
        const link = constellation.append("g")
            .selectAll("line")
            .data(links)
            .enter().append("line")
            .attr("class", "link")
            .attr("stroke-width", d => Math.sqrt(d.value) * 2);
        
        // Draw nodes
        const node = constellation.append("g")
            .selectAll("circle")
            .data(nodes)
            .enter().append("circle")
            .attr("class", d => `node ${d.isCentral ? 'central-node' : ''}`)
            .attr("r", d => d.r)
            .attr("fill", d => d.isCentral ? "#7c3aed" : "#4f46e5")
            .on("mouseover", showTooltip)
            .on("mouseout", hideTooltip)
            .call(d3.drag()
                .on("start", dragstarted)
                .on("drag", dragged)
                .on("end", dragended));
        
        // Add node labels (central node only)
        constellation.append("g")
            .selectAll("text")
            .data(nodes.filter(d => d.isCentral))
            .enter().append("text")
            .attr("dy", 4)
            .attr("text-anchor", "middle")
            .style("fill", "white")
            .style("font-size", "10px")
            .style("font-weight", "bold")
            .text("★");
        
        // Update simulation
        simulation.nodes(nodes).on("tick", ticked);
        simulation.force("link").links(links);
        
        function ticked() {
            link
                .attr("x1", d => d.source.x)
                .attr("y1", d => d.source.y)
                .attr("x2", d => d.target.x)
                .attr("y2", d => d.target.y);
            
            node
                .attr("cx", d => d.x)
                .attr("cy", d => d.y);
        }
        
        function dragstarted(event, d) {
            if (!event.active) simulation.alphaTarget(0.3).restart();
            d.fx = d.x;
            d.fy = d.y;
        }
        
        function dragged(event, d) {
            d.fx = event.x;
            d.fy = event.y;
        }
        
        function dragended(event, d) {
            if (!event.active) simulation.alphaTarget(0);
            d.fx = null;
            d.fy = null;
        }
    }

    function showTooltip(event, d) {
        tooltip.innerHTML = `
            <h4 class="font-bold text-purple-700 mb-1">${d.title}</h4>
            <p class="text-sm text-gray-600 mb-1">${d.authors}</p>
            <p class="text-sm mb-2">${d.journal}, ${d.year} (Cited ${d.citations} times)</p>
            <p class="text-xs text-gray-700 line-clamp-3">${d.abstract}</p>
        `;
        tooltip.style.left = `${event.pageX + 10}px`;
        tooltip.style.top = `${event.pageY + 10}px`;
        tooltip.classList.remove('hidden');
    }

    function hideTooltip() {
        tooltip.classList.add('hidden');
    }

    function renderArticleList(articles) {
        articleList.innerHTML = '';
        
        articles.forEach((article, index) => {
            const articleElement = document.createElement('div');
            articleElement.className = 'article-card bg-white rounded-lg shadow p-6';
            articleElement.innerHTML = `
                <div class="flex flex-col sm:flex-row gap-4">
                    <div class="flex-shrink-0 w-12 h-12 rounded-full flex items-center justify-center ${index === 0 ? 'bg-purple-100 text-purple-700' : 'bg-blue-100 text-blue-700'}">
                        <span class="font-bold">${index + 1}</span>
                    </div>
                    <div class="flex-grow">
                        <h3 class="font-bold text-lg mb-1">${article.title}</h3>
                        <p class="text-sm text-gray-600 mb-1">${article.authors}</p>
                        <p class="text-sm text-gray-700 mb-2">${article.journal}, ${article.year} · Cited ${article.citations} times</p>
                        <p class="text-gray-700 text-sm line-clamp-2 mb-3">${article.abstract}</p>
                        <div class="flex flex-wrap gap-2">
                            <a href="https://doi.org/${article.doi}" target="_blank" class="text-xs px-3 py-1 bg-gray-100 text-gray-700 rounded-full hover:bg-gray-200 transition-colors">
                            Voir la publication
</a>
                            ${index === 0 ? `
                                <span class="text-xs px-3 py-1 bg-purple-100 text-purple-700 rounded-full">
                                    Plus cité
</span>
                            ` : ''}
                        </div>
                    </div>
                </div>
            `;
            articleList.appendChild(articleElement);
        });
    }
    function showNoResults() {
        showLoading(false);
        resultsContainer.classList.add('hidden');
        noResults.classList.remove('hidden');
        
        // Generate fallback suggestions
        const suggestions = generateSearchSuggestions("médecine");
        
        noResults.innerHTML = `
            <div class="text-center py-16">
                <i data-feather="alert-circle" class="mx-auto text-gray-400 w-16 h-16 mb-6"></i>
                <h3 class="text-2xl font-bold text-gray-900 mb-3">Aucun résultat trouvé</h3>
                <p class="text-gray-600 text-lg">Essayez ces recherches alternatives :</p>
                <div class="mt-6 flex flex-wrap justify-center gap-2">
                    ${suggestions.map(s => `
                        <button onclick="document.getElementById('searchQuery').value='${s}'; performSearch();" 
                                class="text-sm px-4 py-2 bg-purple-600 text-white rounded-lg hover:bg-purple-700 transition-colors">
                            ${s}
                        </button>
                    `).join('')}
                </div>
                <button onclick="performSearch()" class="mt-8 px-6 py-3 bg-white text-gray-700 border border-gray-300 rounded-lg hover:bg-gray-50 transition-colors font-medium">
                    Réessayer
                </button>
            </div>
        `;
        feather.replace();
    }
function generateSearchSuggestions(query) {
        const commonTerms = {
            'cancer': ['cancer du sein', 'cancer du poumon', 'traitement du cancer', 'thérapie ciblée cancer'],
            'diabète': ['diabète type 1', 'diabète type 2', 'traitement diabète', 'prévention diabète'],
            'covid': ['covid-19', 'vaccin covid', 'variants covid', 'traitement covid']
        };
        
        // Check if query matches any common term
        for (const [term, suggestions] of Object.entries(commonTerms)) {
            if (query.toLowerCase().includes(term)) {
                return suggestions;
            }
        }
        
        // Default suggestions
        return [
            query + ' traitement',
            query + ' étude clinique',
            'nouveautés ' + query,
            'méta-analyse ' + query
        ];
    }
});