const express = require('express');
const router = express.Router();
const jwt = require('jsonwebtoken');
const cors = require('cors');
const AvtocodProvider = require('../data_providers/avtocod');
const Vin01Provider = require('../data_providers/vin01');
const { regions } = require('../data_providers/constants');

const makeError = error => ({ success: false, error });

function makeNumberQuery(number, regions) {
	let regionsQuery = null;
	if(regions.length > 0) {
		regionsQuery = { $or: regions.map(r => { return { number: { $regex: `\\D${r}$` } }; }) };
	}
	if(number && regionsQuery) {
		return { $and: [ { number: { $regex: number } }, regionsQuery ] };
	} else if(number) {
		return { number: { $regex: number } };
	} else if(regionsQuery) {
		return regionsQuery;
	} else {
		return {};
	}
}

router.post('/check', async (req, res) => {
	const number = req.body.number.replace(/ /g, '').toUpperCase();
	const googleIdToken = req.body.googleIdToken;
	const forceUpdate = req.body.forceUpdate.toLowerCase() == 'true';
	const { login } = req.user;

	console.log(`=== checking number: ${number} ====================================`);

	let collection = req.db.collection('vehicles');
	let vehicles = await collection.find({ number }).toArray();
	if(vehicles.length > 0 && !forceUpdate) {
		console.log('vehicle found in database');
		res.send({ success: true, data: vehicles[0] });
	} else {
		try {
			let autocodPromise = AvtocodProvider.getReport(number);
			let all = [autocodPromise];

			if(googleIdToken) {
				let vin01Promise = Vin01Provider.getReport(number, googleIdToken);
				all.push(vin01Promise);
			}
			let [autocod, vin01] = await Promise.allSettled(all);
			if(autocod.status == 'fulfilled') {
				let vehicle = autocod.value;
				console.log('autocod found vehicle: ', vehicle?.brand?.name?.original);
				vehicle.addedBy = login;
				if(vin01?.status == 'fulfilled') {
					vehicle.vin1 = vin01.value.vin1;
					if(vin01.value?.brand?.name?.original == vehicle?.brand?.name?.original) {
						vehicle.vin2 = vin01.value.vin2;
						vehicle.color = vin01.value.color;
						vehicle.ownershipPeriods = vin01.value.ownershipPeriods;
					}
				}

				// In case of force update of existing vehicle, transfer all events to the new DB record
				if (vehicles.length > 0) {
					vehicle.events = vehicles[0].events;
				}

				await collection.replaceOne({ number }, vehicle, { upsert: true });
				res.status(201).send({ success: true, data: vehicle });
			} else {
				throw Error(autocod.reason);
			}
		} catch(ex) {
			res.send(makeError(ex.message));
			console.error(ex);
		}
	}
});

router.get('/', async (req, res) => {
	const { limit, query, brand, model, color, regions } = req.query;

	let numberQuery = makeNumberQuery(query, regions?.split(',') ?? []);
	let findQuery = { 
		'brand.name.normalized': brand, 
		'model.name.normalized': model, 
		color 
	};

	let findQueryFiltered = Object.fromEntries(Object.entries(findQuery).filter(([,val]) => val ));
	let finalQuery = { ...findQueryFiltered, ...numberQuery };

	try {
		let collection = req.db.collection('vehicles');
		let vehicles = await collection.find(finalQuery).sort({ addedDate: -1 }).limit(parseInt(limit ?? 0)).toArray();
		res.send({ success: true, data: vehicles });
	} catch(ex) {
		res.send(makeError('Error reading vehicles from DB'));
		console.error(ex);
	}
});

router.get('/brands', async (req, res) => {
	try {
		let collection = req.db.collection('vehicles');
		let brands = await collection.distinct('brand.name.normalized');
		res.send({ success: true, data: brands.filter(Boolean) });
	} catch(ex) {
		res.send(makeError('Error reading vehicle brands from DB'));
		console.error(ex);
	}
});

router.get('/models', async (req, res) => {
	try {
		const { brand } = req.query;
		let collection = req.db.collection('vehicles');
		let models = await collection.distinct('model.name.normalized', { 'brand.name.normalized': brand });
		res.send({ success: true, data: models.filter(Boolean) });
	} catch(ex) {
		res.send(makeError('Error reading vehicle models from DB'));
		console.error(ex);
	}
});

router.get('/colors', async (req, res) => {
	try {
		let collection = req.db.collection('vehicles');
		let colors = await collection.distinct('color');
		res.send({ success: true, data: colors.filter(Boolean) });
	} catch(ex) {
		res.send(makeError('Error reading vehicle colors from DB'));
		console.error(ex);
	}
});

router.get('/regions', (req, res) => {
	res.send({ success: true, data: regions });
});

router.get('/shared_report', cors({ origin: 'https://auto.aliencat.pro' }), async (req, res) => {
	try {
		let { plateNumber } = jwt.verify(req.query.token, '#TheTruthIsOutThere');
		let collection = req.db.collection('vehicles');
		let vehicles = await collection.find({ number: plateNumber }).toArray();
		if(vehicles.length > 0) {
			res.send({ success: true, data: vehicles[0] });
		} else {
			res.send(makeError('Vehicle not found'));
		}
	} catch(ex) {
		res.send(makeError(ex.message));
		console.error(ex);
	}
});

module.exports = router;