const path = require('path');
const express = require('express');
const protobufjs = require("protobufjs");

// create prisma db client
const { PrismaClient } = require("@prisma/client");
const prisma = new PrismaClient();

// return big ints as string when using JSON.stringify
BigInt.prototype.toJSON = function() {
    return this.toString();
}

// load protobufs
const root = new protobufjs.Root();
root.resolvePath = (origin, target) => path.join(__dirname, "protos", target);
root.loadSync('meshtastic/mqtt.proto');
const HardwareModel = root.lookupEnum("HardwareModel");
const Role = root.lookupEnum("Config.DeviceConfig.Role");

const app = express();

// serve files inside the public folder from /
app.use('/', express.static(path.join(__dirname, 'public')));

app.get('/', async (req, res) => {
    res.sendFile(path.join(__dirname, 'public/index.html'));
});

app.get('/api', async (req, res) => {

    const links = [
        {
            "path": "/api",
            "description": "This page",
        },
        {
            "path": "/api/v1/nodes",
            "description": "Meshtastic nodes in JSON format.",
        },
    ];

    const html = links.map((link) => {
        return `<li><a href="${link.path}">${link.path}</a> - ${link.description}</li>`;
    }).join("");

    res.send(html);

});

app.get('/api/v1/nodes', async (req, res) => {
    try {

        // get nodes from db
        const nodes = await prisma.node.findMany();

        const nodesWithNeighbourInfo = [];
        for(const node of nodes){
            nodesWithNeighbourInfo.push({
                ...node,
                node_id_hex: "!" + node.node_id.toString(16),
                hardware_model_name: HardwareModel.valuesById[node.hardware_model] ?? "UNKNOWN",
                role_name: Role.valuesById[node.role] ?? "UNKNOWN",
                neighbour_info: await prisma.neighbourInfo.findFirst({
                    where: {
                        node_id: node.node_id,
                    },
                    orderBy: {
                        createdAt: 'desc',
                    },
                }),
            })
        }

        res.json({
            nodes: nodesWithNeighbourInfo,
        });

    } catch(err) {
        console.error(err);
        res.status(500).json({
            message: "Something went wrong, try again later.",
        });
    }
});

app.listen(8080);