import logging
import os

def create_kg_viewer_html(file_path: str) -> None:
    """
    Creates a basic HTML file for visualizing knowledge graphs using D3.js.

    Args:
        file_path (str): The path to save the HTML file.
    """

    html_content = """<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Knowledge Graph Viewer</title>
    <script src="https://d3js.org/d3.v7.min.js"></script>
    <style>
        .node {
            stroke: #fff;
            stroke-width: 1.5px;
        }

        .link {
            stroke: #999;
            stroke-opacity: 0.6;
        }
    </style>
</head>
<body>

    <h1>Knowledge Graph Viewer</h1>
    <div id="graph-container"></div>

    <script>
        function createGraph() {
            const container = d3.select("#graph-container");
            const width = 800;
            const height = 600;

            const svg = container.append("svg")
                .attr("width", width)
                .attr("height", height);

            // Sample data (replace with your actual data loading)
            const nodes = [
                {id: "A"},
                {id: "B"},
                {id: "C"}
            ];
            const links = [
                {source: "A", target: "B"},
                {source: "B", target: "C"}
            ];

            // Create a force simulation
            const simulation = d3.forceSimulation(nodes)
                .force("link", d3.forceLink(links).id(d => d.id).distance(80))
                .force("charge", d3.forceManyBody().strength(-200))
                .force("center", d3.forceCenter(width / 2, height / 2));

            // Create links
            const link = svg.append("g")
                .attr("class", "links")
                .selectAll("line")
                .data(links)
                .enter().append("line")
                .attr("class", "link");

            // Create nodes
            const node = svg.append("g")
                .attr("class", "nodes")
                .selectAll("circle")
                .data(nodes)
                .enter().append("circle")
                .attr("class", "node")
                .attr("r", 20)
                .attr("fill", "skyblue");


            // Add drag functionality
            const drag = simulation => {

                function dragstarted(event) {
                    if (!event.active) simulation.alphaTarget(0.3).restart();
                    event.subject.fx = event.subject.x;
                    event.subject.fy = event.subject.y;
                }

                function dragged(event) {
                    event.subject.fx = event.x;
                    event.subject.fy = event.y;
                }

                function dragended(event) {
                    if (!event.active) simulation.alphaTarget(0);
                    event.subject.fx = null;
                    event.subject.fy = null;
                }

                return d3.drag()
                    .on("start", dragstarted)
                    .on("drag", dragged)
                    .on("end", dragended);
            }


            node.call(drag(simulation));


            // Update positions on each tick
            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("cx", d => d.x)
                    .attr("cy", d => d.y);
            });

            // Error handling for data loading (placeholder)
            if (!nodes || !links) {
                console.error("Error: Could not load knowledge graph data.");
                container.append("p").text("Error: Could not load knowledge graph data.");
            }
        }

        // Check if D3 is loaded
        if (typeof d3 === 'undefined') {
            console.error("D3.js library not loaded!");
            document.body.innerHTML = "Error: D3.js library not loaded. Please check your internet connection.";
        } else {
            // Initialize the graph
            createGraph();
        }

    </script>
</body>
</html>
"""

    try:
        os.makedirs(os.path.dirname(file_path), exist_ok=True)
        with open(file_path, "w") as f:
            f.write(html_content)
        logging.info(f"Successfully created kg_viewer.html at {file_path}")
    except Exception as e:
        logging.error(f"Error creating kg_viewer.html: {e}")


# Example usage:
file_path = "/mnt/e/genesis-system/core/web/kg_viewer.html"
create_kg_viewer_html(file_path)