const HomebrewModel = require('./homebrew.model.js').model;
const NotificationModel = require('./notifications.model.js').model;
const router = require('express').Router();
const Moment = require('moment');
const templateFn = require('../client/template.js');
const zlib = require('zlib');

const HomebrewAPI = require('./homebrew.api.js');
const asyncHandler = require('express-async-handler');

process.env.ADMIN_USER = process.env.ADMIN_USER || 'admin';
process.env.ADMIN_PASS = process.env.ADMIN_PASS || 'password3';

const mw = {
	adminOnly : (req, res, next)=>{
		if(!req.get('authorization')){
			return res
				.set('WWW-Authenticate', 'Basic realm="Authorization Required"')
				.status(401)
				.send('Authorization Required');
		}
		const [username, password] = Buffer.from(req.get('authorization').split(' ').pop(), 'base64')
			.toString('ascii')
			.split(':');
		if(process.env.ADMIN_USER === username && process.env.ADMIN_PASS === password){
			return next();
		}
		throw { HBErrorCode: '52', code: 401, message: 'Access denied' };
	}
};

const junkBrewPipeline = [
	{	$match : {
		updatedAt  : { $lt: Moment().subtract(30, 'days').toDate() },
		lastViewed : { $lt: Moment().subtract(30, 'days').toDate() }
	} },
	{ $project: { textBinSize: { $binarySize: '$textBin' } } },
	{ $match: { textBinSize: { $lt: 140 } } },
	{ $limit: 100 }
];

/* Search for brews that aren't compressed (missing the compressed text field) */
const uncompressedBrewQuery = HomebrewModel.find({
	'text' : { '$exists': true }
}).lean().limit(10000).select('_id');

// Search for up to 100 brews that have not been viewed or updated in 30 days and are shorter than 140 bytes
router.get('/admin/cleanup', mw.adminOnly, (req, res)=>{
	HomebrewModel.aggregate(junkBrewPipeline).option({ maxTimeMS: 60000 })
		.then((objs)=>res.json({ count: objs.length }))
		.catch((error)=>{
			console.error(error);
			res.status(500).json({ error: 'Internal Server Error' });
		});
});

// Delete up to 100 brews that have not been viewed or updated in 30 days and are shorter than 140 bytes
router.post('/admin/cleanup', mw.adminOnly, (req, res)=>{
	HomebrewModel.aggregate(junkBrewPipeline).option({ maxTimeMS: 60000 })
		.then((docs)=>{
			const ids = docs.map((doc)=>doc._id);
			return HomebrewModel.deleteMany({ _id: { $in: ids } });
		}).then((result)=>{
			res.json({ count: result.deletedCount });
		}).catch((error)=>{
			console.error(error);
			res.status(500).json({ error: 'Internal Server Error' });
		});
});

/* Searches for matching edit or share id, also attempts to partial match */
router.get('/admin/lookup/:id', mw.adminOnly, asyncHandler(HomebrewAPI.getBrew('admin', true)), async (req, res, next)=>{
	const brew = req?.brew ?? undefined;

	try {
		if(!brew){
			// No document found
			return res.status(404).json({ error: 'Document not found' });
		}
		return res.json(brew);
	} catch (err) {
		console.error(err);
		return res.status(500).json({ error: 'Internal Server Error' });
	}
});

/* Find 50 brews that aren't compressed yet */
router.get('/admin/finduncompressed', mw.adminOnly, (req, res)=>{
	const query = uncompressedBrewQuery.clone();

	query.exec()
		.then((objs)=>{
			const ids = objs.map((obj)=>obj._id);
			res.json({ count: ids.length, ids });
		})
		.catch((err)=>{
			console.error(err);
			res.status(500).send(err.message || 'Internal Server Error');
		});
});

/* Cleans `<script` and `</script>` from the "text" field of a brew */
router.put('/admin/clean/script/:id', (req, res)=>{
	console.log(`[ADMIN] Cleaning script tags from ShareID ${req.params.id}`);

	function cleanText(text){return text.replaceAll(/(<\/?s)cript/gi, '');};

	HomebrewModel.findOne({ shareId: req.params.id })
		.then((brew)=>{
			if(!brew)
				return res.status(404).send('Brew not found');

			if(!brew.text && brew.textBin) {
				brew.text = zlib.inflateRawSync(brew.textBin);
			}

			const properties = ['text', 'description', 'title'];
			properties.forEach((property)=>{
				brew[property] = cleanText(brew[property]);
			});

			brew.textBin = zlib.deflateRawSync(brew.text);
			brew.text = undefined;

			return brew.save();
		})
		.then((obj)=>res.status(200).send(obj))
		.catch((err)=>{
			console.error(err);
			res.status(500).send('Error while saving');
		});
});

/* Compresses the "text" field of a brew to binary */
router.put('/admin/compress/:id', (req, res)=>{
	HomebrewModel.findOne({ _id: req.params.id })
		.then((brew)=>{
			if(!brew)
				return res.status(404).send('Brew not found');

			if(brew.text) {
				brew.textBin = brew.textBin || zlib.deflateRawSync(brew.text);	//Don't overwrite textBin if exists
				brew.text = undefined;
			}

			return brew.save();
		})
		.then((obj)=>res.status(200).send(obj))
		.catch((err)=>{
			console.error(err);
			res.status(500).send('Error while saving');
		});
});


router.get('/admin/stats', mw.adminOnly, async (req, res)=>{
	try {
		const totalBrewsCount = await HomebrewModel.countDocuments({});
		const publishedBrewsCount = await HomebrewModel.countDocuments({ published: true });

		return res.json({
			totalBrews          : totalBrewsCount,
			totalPublishedBrews : publishedBrewsCount
		});
	} catch (error) {
		console.error(error);
		return res.status(500).json({ error: 'Internal Server Error' });
	}
});

// #######################   NOTIFICATIONS

router.get('/admin/notification/all', async (req, res, next)=>{
	try {
		const notifications = await NotificationModel.getAll();
		return res.json(notifications);

	} catch (error) {
		console.log('Error getting all notifications: ', error.message);
		return res.status(500).json({ message: error.message });
	}
});

router.post('/admin/notification/add', mw.adminOnly, async (req, res, next)=>{
	try {
		const notification = await NotificationModel.addNotification(req.body);
		return res.status(201).json(notification);
	} catch (error) {
		console.log('Error adding notification: ', error.message);
		return res.status(500).json({ message: error.message });
	}
});

router.delete('/admin/notification/delete/:id', mw.adminOnly, async (req, res, next)=>{
	try {
		const notification = await NotificationModel.deleteNotification(req.params.id);
		return res.json(notification);
	} catch (error) {
		console.error('Error deleting notification: { key: ', req.params.id, ' error: ',  error.message, ' }');
		return res.status(500).json({ message: error.message });
	}
});

router.get('/admin', mw.adminOnly, (req, res)=>{
	templateFn('admin', {
		url : req.originalUrl
	})
	.then((page)=>res.send(page))
	.catch((err)=>{
		console.log(err);
		res.sendStatus(500);
	});
});

module.exports = router;