const express = require("express");
const bodyParser = require("body-parser");
const cookieParser = require("cookie-parser")
const cors = require("cors");
const helmet = require("helmet");
const morgan = require("morgan");
var api = require("./package.json");

const {pveAPIToken, listenPort, domain} = require("./vars.js");
const {checkAuth, requestPVE, handleResponse, getUnusedDiskData, getDiskByConfig} = require("./pveutils.js");
const {init, requestResources, allocateResources, releaseResources} = require("./db.js");

const app = express();
app.use(helmet());
app.use(bodyParser.urlencoded({extended: true}));
app.use(cookieParser())
app.use(cors({origin: domain}));
app.use(morgan("combined"));


app.get("/api/version", (req, res) => {
	res.send({version: api.version});
});

app.get("/api/echo", (req, res) => {
	res.send({body: req.body, cookies: req.cookies});
});

app.get("/api/auth", async (req, res) => {
	let result = await checkAuth(req.cookies);
	res.send({auth: result});
});

app.get("/api/proxmox/*", async (req, res) => { // proxy endpoint for GET proxmox api with no token
	path = req.url.replace("/api/proxmox", "");
	let result = await requestPVE(path, "GET", req.cookies);
	res.send(result.data, result.status);
});

app.post("/api/proxmox/*", async (req, res) => { // proxy endpoint for POST proxmox api with no token
	path = req.url.replace("/api/proxmox", "");
	let result = await requestPVE(path, "POST", req.cookies, JSON.stringify(req.body)); // need to stringify body because of other issues
	res.send(result.data, result.status);
});

app.post("/api/disk/detach", async (req, res) => {
	let vmpath = `/nodes/${req.body.node}/${req.body.type}/${req.body.vmid}`;

	let auth = await checkAuth(req.cookies, vmpath);
	if (!auth) {
		res.status(401).send({auth: auth});
		return;
	}

	let action = JSON.stringify({delete: req.body.disk});

	let method = req.body.type === "qemu" ? "POST" : "PUT";
	let result = await requestPVE(`${vmpath}/config`, method, req.cookies, action, pveAPIToken);
	result = await handleResponse(req.body.node, result);
	res.send({auth: auth, status: result.status, data: result.data});
});

app.post("/api/disk/attach", async (req, res) => {
	let vmpath = `/nodes/${req.body.node}/${req.body.type}/${req.body.vmid}`;

	let auth = await checkAuth(req.cookies, vmpath);
	if (!auth) {
		res.status(401).send({auth: auth});
		return;
	}

	let action = {};
	action[req.body.disk] = req.body.data;
	action = JSON.stringify(action);

	let method = req.body.type === "qemu" ? "POST" : "PUT";
	let result = await requestPVE(`${vmpath}/config`, method, req.cookies, action, pveAPIToken);
	result = await handleResponse(req.body.node, result);
	res.send({auth: auth, status: result.status, data: result.data});
});

app.post("/api/disk/resize", async (req, res) => {
	let vmpath = `/nodes/${req.body.node}/${req.body.type}/${req.body.vmid}`;

	let auth = await checkAuth(req.cookies, vmpath);
	if (!auth) {
		res.status(401).send({auth: auth});
		return;
	}

	let diskConfig = await getDiskByConfig(req.body.node, req.body.type, req.body.vmid, req.body.disk);
	if (!diskConfig) {
		res.status(500).send({auth: auth, data:{error: `requested disk ${req.body.disk} does not exist`}});
	}	
	let storage = diskConfig.split(":")[0];
	let request = {};
	request[storage] = req.body.size;
	if (!requestResources(req.cookies.username, request)) {
		res.status(500).send({auth: auth, data:{request: request, error: `${storage} could not fulfill request`}});
		return;
	}

	let action = JSON.stringify({disk: req.body.disk, size: `+${req.body.size}G`});

	let result = await requestPVE(`${vmpath}/resize`, "PUT", req.cookies, action, pveAPIToken);
	result = await handleResponse(req.body.node, result);
	if (result.status === 200) {
		allocateResources(req.cookies.username, request);
	}
	res.status(result.status).send({auth: auth, data: result.data});
});

app.post("/api/disk/move", async (req, res) => {
	let vmpath = `/nodes/${req.body.node}/${req.body.type}/${req.body.vmid}`;
	let route = req.body.type === "qemu" ? "move_disk" : "move_volume";

	let auth = await checkAuth(req.cookies, vmpath);
	if (!auth) {
		res.send({auth: auth});
		return;
	}

	let action = {storage: req.body.storage, delete: req.body.delete};
	if (req.body.type === "qemu") {
		action.disk = req.body.disk
	}
	else {
		action.volume = req.body.disk
	}
	action = JSON.stringify(action);

	let result = await requestPVE(`${vmpath}/${route}`, "POST", req.cookies, action, pveAPIToken);
	result = await handleResponse(req.body.node, result);
	res.send({auth: auth, data: result.data}, result.status);
});

app.post("/api/disk/delete", async (req, res) => {
	let vmpath = `/nodes/${req.body.node}/${req.body.type}/${req.body.vmid}`;

	let auth = await checkAuth(req.cookies, vmpath);
	if (!auth) {
		res.send({auth: auth});
		return;
	}

	let action = JSON.stringify({delete: req.body.disk});

	let method = req.body.type === "qemu" ? "POST" : "PUT";
	let result = await requestPVE(`${vmpath}/config`, method, req.cookies, action, pveAPIToken);
	result = await handleResponse(req.body.node, result);
	res.send({auth: auth, data: result.data}, result.status);
});

app.post("/api/disk/create", async (req, res) => {
	let vmpath = `/nodes/${req.body.node}/${req.body.type}/${req.body.vmid}`;

	let auth = await checkAuth(req.cookies, vmpath);
	if (!auth) {
		res.send({auth: auth});
		return;
	}

	let action = {};
	if (req.body.disk.includes("ide") && req.body.iso) {
		action[req.body.disk] = `${req.body.iso},media=cdrom`;
	}
	else if (req.body.type === "qemu") { // type is qemu, use sata
		action[req.body.disk] = `${req.body.storage}:${req.body.size}`;
	}
	else { // type is lxc, use mp and add mp and backup values
		action[req.body.disk] = `${req.body.storage}:${req.body.size},mp=/mp${req.body.device}/,backup=1`;
	}
	action = JSON.stringify(action);

	let method = req.body.type === "qemu" ? "POST" : "PUT";
	let result = await requestPVE(`${vmpath}/config`, method, req.cookies, action, pveAPIToken);
	result = await handleResponse(req.body.node, result);
	res.send({auth: auth, data: result.data}, result.status);
});

app.post("/api/resources", async (req, res) => {
	let vmpath = `/nodes/${req.body.node}/${req.body.type}/${req.body.vmid}`;

	let auth = await checkAuth(req.cookies, vmpath);
	if (!auth) {
		res.send({auth: auth});
		return;
	}

	let method = req.body.type === "qemu" ? "POST" : "PUT";
	action = JSON.stringify({cores: req.body.cores, memory: req.body.memory});
	let result = await requestPVE(`${vmpath}/config`, method, req.cookies, action, pveAPIToken);
	result = await handleResponse(req.body.node, result);
	res.send({auth: auth, data: result.data}, result.status);
});

app.post("/api/instance", async (req, res) => {
	let auth = await checkAuth(req.cookies);
	if (!auth) {
		res.send({auth: auth});
		return;
	}

	let user = await requestPVE(`/access/users/${req.cookies.username}`, "GET", null, null, pveAPIToken);
	let group = user.data.data.groups[0];
	if (!group) {
		res.send({auth: auth, data: {error: `user ${req.cookies.username} has no group membership`}});
	}	

	let action = {
		vmid: req.body.vmid,
		cores: req.body.cores,
		memory: req.body.memory,
		pool: group
	};
	if (req.body.type === "lxc") {
		action.swap = req.body.swap;
		action.hostname = req.body.name;
		action.unprivileged = 1;
		action.features = "nesting=1";
		action.password = req.body.password;
		action.ostemplate = req.body.ostemplate;
		action.rootfs = `${req.body.rootfslocation}:${req.body.rootfssize}`;
	}
	else {
		action.name = req.body.name;
	}
	action = JSON.stringify(action);

	let result = await requestPVE(`/nodes/${req.body.node}/${req.body.type}`, "POST", req.cookies, action, pveAPIToken);
	result = await handleResponse(req.body.node, result);
	res.send({auth: auth, data: result.data}, result.status);
});

app.delete("/api/instance", async (req, res) => {
	let vmpath = `/nodes/${req.body.node}/${req.body.type}/${req.body.vmid}`;

	let auth = await checkAuth(req.cookies, vmpath);
	if (!auth) {
		res.send({auth: auth});
		return;
	}

	let result = await requestPVE(`${vmpath}`, "DELETE", req.cookies, null, pveAPIToken);
	result = await handleResponse(req.body.node, result);
	res.send({auth: auth, data: result.data}, result.status);
});

app.listen(listenPort, () => {
	init();
	console.log(`proxmoxaas-api v${api.version} listening on port ${listenPort}`);
});