const axios = require('axios');
const config = require('../config');

/**
 * Fetches the Bundle from the local HAPI FHIR server and delegates the
 * transformation to the national node (bundle-signer), which holds the
 * signing keys. Returns the national node's response as-is.
 */
async function transformBundle(id, operation, query) {
    const bundleUrl = `${config.fhir.url}/Bundle/${id}`;
    const { data: bundle } = await axios.get(bundleUrl);

    const response = await axios.post(
        `${config.bundleSigner.url}/Bundle/$${operation}`,
        bundle,
        { params: query },
    );
    return response;
}

/**
 * GET /fhir/Bundle/:id/$ddcc
 */
async function getDDCC(req, res, next) {
    try {
        const response = await transformBundle(req.params.id, 'ddcc', req.query);
        res.status(response.status).json(response.data);
    } catch (err) {
        next(err);
    }
}

/**
 * GET /fhir/Bundle/:id/$dvc
 */
async function getDVC(req, res, next) {
    try {
        const response = await transformBundle(req.params.id, 'dvc', req.query);
        res.status(response.status).json(response.data);
    } catch (err) {
        next(err);
    }
}

/**
 * GET /fhir/Bundle/:id/$icvp
 */
async function getICVP(req, res, next) {
    try {
        const response = await transformBundle(req.params.id, 'icvp', req.query);
        res.status(response.status).json(response.data);
    } catch (err) {
        next(err);
    }
}

/**
 * GET /fhir/Bundle/:id/$icvp2
 */
async function getICVP2(req, res, next) {
    try {
        const response = await transformBundle(req.params.id, 'icvp2', req.query);
        res.status(response.status).json(response.data);
    } catch (err) {
        next(err);
    }
}

/**
 * GET /fhir/Bundle/:id/$meow
 */
async function getMeow(req, res, next) {
    try {
        const response = await transformBundle(req.params.id, 'meow', req.query);
        res.status(response.status).json(response.data);
    } catch (err) {
        next(err);
    }
}

module.exports = {
    getDDCC, getDVC, getICVP, getICVP2, getMeow,
};