/**
 * Graph Visualization Component
 * D3.js Force-directed graph for entity relationships
 */

function initializeGraphVisualization() {
    const container = document.getElementById('graph-container');
    if (!container) return;
    
    const width = container.clientWidth;
    const height = container.clientHeight || 384;
    
    // Clear existing
    const svg = d3.select('#entity-graph');
    svg.selectAll('*').remove();
    svg.attr('viewBox', [0, 0, width, height]);
    
    // Sample data based on entities
    const nodes = [
        { id: 'QE001', name: 'Quantum Alpha LP', risk: 92, type: 'fund', group: 1 },
        { id: 'SB002', name: 'Sigma Beta Fund', risk: 88, type: 'fund', group: 1 },
        { id: 'AA003', name: 'AI Alpha Tech', risk: 65, type: 'manager', group: 2 },
        { id: 'BS004', name: 'Beta Sigma Mgmt', risk: 58, type: 'manager', group: 2 },
        { id: 'MT005', name: 'Mirror Trading', risk: 35, type: 'trading', group: 3 },
        { id: 'SHELL1', name: 'Cayman Shell A', risk: 95, type: 'shell', group: 4 },
        { id: 'SHELL2', name: 'BVI Holdings', risk: 87, type: 'shell', group: 4 }
    ];
    
    const links = [
        { source: 'AA003', target: 'QE001', value: 1, type: 'manages' },
        { source: 'BS004', target: 'SB002', value: 1, type: 'manages' },
        { source: 'QE001', target: 'SB002', value: 2, type: 'correlated' },
        { source: 'SHELL1', target: 'AA003', value: 1, type: 'owns' },
        { source: 'SHELL2', target: 'BS004', value: 1, type: 'owns' },
        { source: 'MT005', target: 'QE001', value: 1, type: 'trades' },
        { source: 'SHELL1', target: 'SHELL2', value: 3, type: 'entangled' }
    ];
    
    // Simulation setup
    const simulation = d3.forceSimulation(nodes)
        .force('link', d3.forceLink(links).id(d => d.id).distance(100))
        .force('charge', d3.forceManyBody().strength(-400))
        .force('center', d3.forceCenter(width / 2, height / 2))
        .force('collision', d3.forceCollide().radius(40));
    
    // Arrow markers
    svg.append('defs').selectAll('marker')
        .data(['end'])
        .enter().append('marker')
        .attr('id', 'arrow')
        .attr('viewBox', '0 -5 10 10')
        .attr('refX', 25)
        .attr('refY', 0)
        .attr('markerWidth', 6)
        .attr('markerHeight', 6)
        .attr('orient', 'auto')
        .append('path')
        .attr('d', 'M0,-5L10,0L0,5')
        .attr('fill', '#2dd4bf');
    
    // Links
    const link = svg.append('g')
        .selectAll('line')
        .data(links)
        .join('line')
        .attr('class', 'node-link')
        .attr('stroke-width', d => Math.sqrt(d.value) * 2)
        .attr('stroke', d => {
            if (d.type === 'entangled') return '#ef4444';
            if (d.type === 'correlated') return '#f59e0b';
            return '#2dd4bf';
        })
        .attr('stroke-opacity', 0.6);
    
    // Nodes
    const node = svg.append('g')
        .selectAll('g')
        .data(nodes)
        .join('g')
        .attr('class', 'node-circle')
        .call(d3.drag()
            .on('start', dragstarted)
            .on('drag', dragged)
            .on('end', dragended));
    
    // Node circles
    node.append('circle')
        .attr('r', d => d.risk > 80 ? 20 : 15)
        .attr('fill', d => {
            if (d.risk > 80) return '#ef4444';
            if (d.risk > 60) return '#f59e0b';
            if (d.risk > 40) return '#14b8a6';
            return '#22c55e';
        })
        .attr('stroke', '#0f172a')
        .attr('stroke-width', 2)
        .style('cursor', 'pointer');
    
    // Node labels
    node.append('text')
        .text(d => d.name)
        .attr('x', 0)
        .attr('y', d => d.risk > 80 ? 28 : 23)
        .attr('text-anchor', 'middle')
        .attr('fill', '#94a3b8')
        .attr('font-size', '10px')
        .attr('font-family', 'Inter, sans-serif');
    
    // Tooltips
    node.append('title')
        .text(d => `${d.name}\nRisk: ${d.risk}%\nType: ${d.type}`);
    
    // Click handlers
    node.on('click', (event, d) => {
        viewEntity(d.id);
    });
    
    // Update positions
    simulation.on('tick', () => {
        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('transform', d => `translate(${d.x},${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;
    }
    
    // Zoom controls
    window.zoomGraph = (scale) => {
        const currentTransform = d3.zoomTransform(svg.node());
        const newTransform = currentTransform.scale(scale);
        svg.transition().duration(750).call(d3.zoom().transform, newTransform);
    };
    
    window.resetGraph = () => {
        svg.transition().duration(750).call(d3.zoom().transform, d3.zoomIdentity);
    };
    
    // Add zoom behavior
    const zoom = d3.zoom()
        .scaleExtent([0.5, 4])
        .on('zoom', (event) => {
            svg.selectAll('g').attr('transform', event.transform);
        });
    
    svg.call(zoom);
}

// Expose to window
window.initializeGraphVisualization = initializeGraphVisualization;