const fs = require("fs");
const path = require("path");

const websPath = path.join(__dirname, "..", "public");

/**
 * Registers map-related routes.
 * @param {Object} router - Route wrapper with get/post methods
 * @param {Object} app - SignalK app instance
 * @param {Object} settings - Plugin settings
 */
function registerMapRoutes(router, app, settings) {
    // Serve interactive map with Mapbox token injected
    router.get('/map', (req, res) => {
        const filePath = path.join(websPath, "map.html");
        fs.readFile(filePath, "utf8", (err, html) => {
            if (err) {
                res.status(500).send("Error loading map");
                return;
            }
            const token = settings?.mapboxKey ?? "";
            const finalHtml = html.replace("{{MAPBOX_KEY}}", token);
            res.setHeader("Content-Type", "text/html; charset=utf-8");
            res.send(finalHtml);
        });
    });

    // Stream boat position and serve latest via API
    let lastPosition = null;

    app.streambundle.getSelfStream("navigation.position").onValue(pos => {
        lastPosition = pos;
    });

    router.get('/map/boat', (req, res) => {
        if (!lastPosition) {
            return res.json({ error: "No position data available" });
        }
        res.json(lastPosition);
    });
}

module.exports = registerMapRoutes;