import express from "express";
import ejs from "ejs";
import multer from "multer";
import { db } from "./database/db";
import { eq, sql } from "drizzle-orm";
import { personTable, pointsTable } from "./database/schema";
import calculateNewPoints from "./gambleMath";

const app = express();
const port = 8080;
const upload = multer();

//app.use(express.urlencoded);
app.use(express.static('www'));

app.get("/", async (req, res) => {
	const people = await db.select({
		personId: personTable.personId,
		name: personTable.name
	}).from(personTable)
		.leftJoin(pointsTable, eq(personTable.personId, pointsTable.personId))
		.groupBy(personTable.personId)

	ejs.renderFile('src/templates/index.ejs', { people: people }, function (err, str) {
		if (err) {
			res.status(500).send(err);
		}

		res.send(str);
	});
});

function getNextGambleTime(time: Date): Date {
	return new Date(time.getTime() + 3 * 60 * 60 * 1000);
}

function isGambleAvailable(time: Date | null): boolean {
	if (time == null) {
		return true;
	}

	// 3 hour delay before showing
	if (getNextGambleTime(time) < new Date()) {
		return true;
	}

	return false;
}

function isDetailAvailable(time: Date | null): boolean {
	if (time == null) {
		return false;
	}

	// 2 minute delay before hiding
	if (new Date(time.getTime() + 2 * 60 * 1000) > new Date()) {
		return true;
	}

	return false;
}

function sendError(res: express.Response, code: number, error: string): void {
	ejs.renderFile('src/templates/error.ejs', { error: error }, function (err, str) {
		if (err) {
			res.status(500).send(err);
		}

		res.status(code).send(str);
	});
}

app.get("/gamble/:id", async (req, res) => {
	let id = parseInt(req.params.id);
	if (id == undefined) {
		res.status(404).send("Invalid person id");
		return;
	}

	let person = await db.query.personTable.findFirst({
		where: eq(personTable.personId, id)
	})

	if (!person) {
		res.status(404).send("Invalid person id");
		return;
	}

	if (isDetailAvailable(person.gambleTime)) {
		res.redirect('/person/' + id);
		return;
	}

	if (!isGambleAvailable(person.gambleTime)) {
		if (person.gambleTime == null) {
			sendError(res, 423, "Gamble není dostupný");
		} else {
			sendError(res, 423, "Gamble bude dostupný až ve " + getNextGambleTime(person.gambleTime).toLocaleString('cs', {
				hour: "2-digit",
				minute: "2-digit",
			}));
		}
		return;
	}

	ejs.renderFile('src/templates/gamble.ejs', { person: person }, function (err, str) {
		if (err) {
			res.status(500).send(err);
		}

		res.send(str);
	});
});

app.post("/gamble/:id", upload.none(), async (req, res) => {
	let id = parseInt(req.params.id);
	if (id == undefined) {
		res.status(404).send("Invalid person id");
		return;
	}

	let person = (await db.select({
		personId: personTable.personId,
		name: personTable.name,
		secret: personTable.secret,
		gambleTime: personTable.gambleTime,
		pointsTotal: sql<string>`coalesce(sum(${pointsTable.points}), 0)`
	}).from(personTable)
		.leftJoin(pointsTable, eq(personTable.personId, pointsTable.personId))
		.where(eq(personTable.personId, id))
		.groupBy(personTable.personId))[0];

	if (!person) {
		sendError(res, 404, "Osoba nenalezena");
		return;
	}

	if (!isGambleAvailable(person.gambleTime)) {
		sendError(res, 423, "Nelze zadat další gamble");
		return;
	}

	if (person.secret != req.body['secret']) {
		sendError(res, 423, "Nesprávé heslo");
		return;
	}

	let currentPoints = parseInt(person.pointsTotal);
	let newTotalPoints = calculateNewPoints(currentPoints);
	let pointsDiff = newTotalPoints - currentPoints;

	await db.update(personTable)
		.set({
			gambleTime: sql`NOW()`
		})
		.where(eq(personTable.personId, person.personId));

	await db.insert(pointsTable).values({
		personId: id,
		points: pointsDiff
	})

	res.redirect('/person/' + id);
});

app.get("/person/:id", async (req, res) => {
	let id = parseInt(req.params.id);
	if (id == undefined) {
		sendError(res, 404, "Osoba nenalezena");
		return;
	}

	let person = (await db.select({
		personId: personTable.personId,
		name: personTable.name,
		gambleTime: personTable.gambleTime,
		pointsTotal: sql`coalesce(sum(${pointsTable.points}), 0)`
	}).from(personTable)
		.leftJoin(pointsTable, eq(personTable.personId, pointsTable.personId))
		.where(eq(personTable.personId, id))
		.groupBy(personTable.personId))[0];

	if (!person) {
		sendError(res, 404, "Osoba nenalezena");
		return;
	}

	if (!isDetailAvailable(person.gambleTime)) {
		sendError(res, 404, "Detail bude dostupný až po dalším gamblu");
	}

	let points = await db.query.pointsTable.findMany({
		where: eq(pointsTable.personId, id)
	});

	ejs.renderFile('src/templates/person.ejs', { person: person, points: JSON.stringify(points) }, function (err, str) {
		if (err) {
			res.status(500).send(err);
		}

		res.send(str);
	});
});

app.listen(port, () => {
	console.log(`Listening on port ${port}...`);
});