let db;
const express = require('express');
const router = express.Router();

module.exports = (dbInit) => {
	db = dbInit;
	return router;
};


router.get('/', (req, res) => {
	res.json({ success: true, message: "Welcome to the NOTXCS API!" });
});
router.get('/ping', (req, res) => {
	// TODO: Implement a more robust health check. Probably will revolve around checking db conn and others.
	res.json({ success: true, message: "pong" });
});

router.get('/:placeId', (req, res) => {
	const placeId = req.params.placeId;
	const apiKey = req.query.apiKey;
	const universeid = req.query.universeid;

	// For some reason the official XCS api doesn't actually check the api key when getting settings? So we won't either.
	// XCS Also ignores universe ID. Probably used for some logging. We will ignore it.
	if (!placeId) {
		return res.status(404).json({ success: false, message: "What? How?" });
	}

	db.get(`SELECT * FROM places WHERE id = ?`, [placeId], (err, row) => {
		if (err) {
			console.error('Failed to retrieve place settings:', err.message);
			return res.status(500).json({ success: false, message: "Internal server error" });
		}

		if (!row) {
			return res.status(404).json({ success: false, message: "Place not found" });
		}

		db.all(`SELECT * FROM access_points WHERE placeId = ?`, [placeId], (err, accessPoints) => {
			if (err) {
				console.error('Failed to retrieve access points:', err.message);
				return res.status(500).json({ success: false, message: "Internal server error" });
			}

			let resp = {
				success: true,
				accessPoints: accessPoints.reduce((acc, ap) => {
					const armed = !!ap.armState; // Will have state 2 eventually for armed on schedule, but for now just 1 or 0.

					acc[ap.id] = {
						id: ap.id,
						name: ap.name,
						unlockTime: ap.unlockTime,
						config: {
							active: !!ap.enabled,
							armed,
							scanData: {
								ready: JSON.parse(ap.readyData || '{}'),
								disarmed: JSON.parse(ap.disarmedData || '{}')
							}
						}
					}
					return acc;
				}, {})
			};
			console.log(resp)
			res.json(resp);
		});
	});
});

router.get('/:placeId/:accessPointId/onScan', async (req, res) => {
	// This one DOES check api key.
	const placeId = req.params.placeId;
	const accessPointId = req.params.accessPointId;
	const apiKey = req.query.apiKey;
	const userId = req.query.userId;
	const cardNumbers = req.query.cardNumbers ? req.query.cardNumbers.split(',') : [];
	const universeid = req.query.universeid || '0';

	if (!placeId || !accessPointId) {
		return res.status(404).json({ success: false, message: "What? How?" });
	}

	if (!apiKey) {
		return res.status(400).json({ success: false, message: "API key is required" });
	}

	db.get(`SELECT * FROM places WHERE id = ? AND apiKey = ?`, [placeId, apiKey], (err, place) => {
		if (err) {
			console.error('Failed to retrieve place settings:', err.message);
			return res.status(500).json({ success: false, message: "Internal server error" });
		}

		if (!place) {
			return res.status(404).json({ success: false, message: "Place not found or invalid API key" });
		}

		db.get(`SELECT * FROM access_points WHERE id = ? AND placeId = ?`, [accessPointId, placeId], (err, ap) => {
			if (err) {
				console.error('Failed to retrieve access point:', err.message);
				return res.status(500).json({ success: false, message: "Internal server error" });
			}

			if (!ap) {
				return res.status(404).json({ success: false, message: "Access point not found" });
			}

			db.all(`SELECT * FROM acl WHERE accessPoint = ?`, [accessPointId], async (err, aclEntries) => {
				if (err) {
					console.error('Failed to retrieve ACL entries:', err.message);
					return res.status(500).json({ success: false, message: "Internal server error" });
				}

				let userGroups = await fetch(`https://groups.roblox.com/v1/users/${userId}/groups/roles`).then(r => r.json()).then(data => data.data || []).catch(() => []);
				userGroups = userGroups.map(g => ({group: g.group.id, rank: g.role.rank}));
				console.log('User groups:', userGroups);
				let grant_type;
				let granted = false;
				// Types: 0 = User ID; 1 = Card Number; 2 = Group Exact Rank; 3 = Group Min Rank, 4 = Allow All
				// Check user ID, then group ranks, then card numbers.
				for (const entry of aclEntries) {
					switch (entry.type) {
						case 0: // User ID
							if (entry.data == userId) {
								granted = true;
							}
							break;
						case 1: // Card Number
							if (cardNumbers.includes(entry.data)) {
								granted = true;
							}
							break;
						case 2: { // Group Exact Rank
							const [group, rank] = entry.data.split(':');
							if (userGroups.some(g => g.group == group && g.rank == rank)) {
								granted = true;
							}
							break;
						}
						case 3: { // Group Min Rank
							const [group, rank] = entry.data.split(':');
							if (userGroups.some(g => g.group == group && g.rank >= rank)) {
								granted = true;
							}
							break;
						}
						case 4: // Allow All
							granted = true;
							break;
					}

					if (granted) break;
				}

				const responseData = granted ? {
					success: true,
					grant_type: 'user_scan',
					response_code: 'access_granted',
					response_time: 0, // This is just analytics for how long their backend took to generate the response
					scan_data: JSON.parse(ap.grantedData || '{}')
				} : {
					success: true,
					grant_type: 'user_scan',
					response_code: 'access_denied',
					response_time: 0,
					scan_data: JSON.parse(ap.deniedData || '{}')
				}
				res.json(responseData);
			});
		});
	});
});