'use strict';

const Promise = require("bluebird");
const express = require("express");
// const expressWs = require("express-ws");
const knex = require("knex");
const path = require("path");
const bodyParser = require("body-parser");

const expressAsyncReact = require("./express-async-react");

function projectPath(targetPath) {
	return path.join(__dirname, "..", targetPath);
}

module.exports = function () {
	let db = knex(require("../knexfile"));
	let imageStore = require("./image-store")(projectPath("./images"));
	let taskTracker = require("../lib/tasks/tracker")();
	let apiQuery = require("./api")();

	let state = {db, imageStore, taskTracker};

	let app = express();
	// expressWs(app);

	app.engine("jsx", expressAsyncReact.createEngine({
		prepare: (template, locals) => {
			return Promise.try(() => {
				if (template.query != null) {
					let queryArguments = (template.queryArguments != null)
						? template.queryArguments(locals)
						: {};

					return apiQuery(template.query, queryArguments);
				}
			}).then((result) => {
				if (result == null) {
					return {};
				} else {
					if (result.errors != null && result.errors.length > 0) {
						throw result.errors[0];
					} else {
						return {
							data: result.data
						};
					}
				}
			});
		}
	}));

	app.set("view engine", "jsx");
	app.set("views", projectPath("src/views"));

	app.locals[expressAsyncReact.Settings] = {
		componentPath: "template"
	};

	app.use((req, res, next) => {
		res.locals.currentPath = req.originalUrl;

		next();
	});

	app.use(express.static(projectPath("public")));

	app.use(bodyParser.urlencoded({
		extended: true
	}));

	app.use(require("./routes/index"));
	app.use("/disk-images", require("./routes/disk-images")(state));
	app.use("/instances", require("./routes/instances")(state));
	app.use("/hardware/storage-devices", require("./routes/storage-devices")(state));

	app.use((err, req, res, next) => {
		if (err.showChain != null) {
			console.log(err.showChain());
			console.log("#####################");
			console.log(err.getAllContext());
			
		} else {
			console.log(err.stack);
		}

		res.render("error", {
			error: err
		});
	});

	return app;
};