const user = ":user([^@/]+)";
const host = ":host([^@/]+)";
const type = ":type((dsa|rsa|ecdsa|ed25519))";

let express = require("express");
let db = require("../libs/Database").instance();
let router = express.Router();
let userRouter = express.Router();
let deployRouter = express.Router();

function combineToList(a, b) {
    return a + "\n" + b;
}

function toList(array) {
    return array.reduce(combineToList, "").trim();
}

router.use(["/u", "/user", "/users", "/userKeys"], userRouter);
router.use(["/d", "/deploy", "/deployKeys"], deployRouter);

function keyReq(table, req, res) {
    let p = req.params;
    let q = db.q.from(table).select("publicKeyComment");
    if (p.user) q.filter("user", p.user);
    if (p.host) q.filter("host", p.host);
    if (p.type) q.filter("type", p.type);
    q.list((e, d) => {
        if (e) return res.status(500).render('error', {message: e.message, error: e});
        res.type("text/plain");
        res.send(toList(d));
    });
}

[
    "/",
    "/" + type,
    "/@" + host,
    "/" + user,
    "/" + user + "@" + host,
    "/@" + host + "/" + type,
    "/" + user + "/" + type,
    "/" + user + "@" + host + "/" + type,
].forEach(e => {
    userRouter.get(e, (req, res) => keyReq("sshUserKeys", req, res));
    deployRouter.get(e, (req, res) => keyReg("sshDeployKeys", req, res));
});

module.exports = router;