let express = require('express');
const { allowDevAllOrigin, getSettings, setting } = require('../util-server');
const { R } = require('redbean-node');
const server = require('../server');
const apicache = require('../modules/apicache');
const Monitor = require('../model/monitor');
const dayjs = require('dayjs');
const { UP, flipStatus, debug, DOWN } = require('../../src/util');
let router = express.Router();

let cache = apicache.middleware;
let io = server.io;

router.get('/api/entry-page', async (_, response) => {
	allowDevAllOrigin(response);
	response.json(server.entryPage);
});

router.get('/api/push/:pushToken', async (request, response) => {
	try {
		let pushToken = request.params.pushToken;
		let msg = request.query.msg || 'OK';
		let ping = request.query.ping || null;
		let health = request.query.health || 'UP'; // Backwards compatible, so if nothing was specified it will work as always

		let monitor = await R.findOne('monitor', ' push_token = ? AND active = 1 ', [pushToken]);

		if (!monitor) {
			throw new Error('Monitor not found or not active.');
		}

		const previousHeartbeat = await Monitor.getPreviousHeartbeat(monitor.id);

		let status = health === 'UP' ? UP : DOWN;
		if (monitor.isUpsideDown()) {
			status = flipStatus(status);
		}

		let isFirstBeat = true;
		let previousStatus = status;
		let duration = 0;

		let bean = R.dispense('heartbeat');
		bean.time = R.isoDateTime(dayjs.utc());

		if (previousHeartbeat) {
			isFirstBeat = false;
			previousStatus = previousHeartbeat.status;
			duration = dayjs(bean.time).diff(dayjs(previousHeartbeat.time), 'second');
		}

		debug('PreviousStatus: ' + previousStatus);
		debug('Current Status: ' + status);

		bean.important = Monitor.isImportantBeat(isFirstBeat, previousStatus, status);
		bean.monitor_id = monitor.id;
		bean.status = status;
		bean.msg = msg;
		bean.ping = ping;
		bean.duration = duration;

		await R.store(bean);

		io.to(monitor.user_id).emit('heartbeat', bean.toJSON());
		Monitor.sendStats(io, monitor.id, monitor.user_id);

		response.json({
			ok: true,
		});

		if (bean.important) {
			await Monitor.sendNotification(isFirstBeat, monitor, bean);
		}
	} catch (e) {
		response.json({
			ok: false,
			msg: e.message,
		});
	}
});

// Status Page Config
router.get('/api/status-page/config', async (_request, response) => {
	allowDevAllOrigin(response);

	let config = await getSettings('statusPage');

	if (!config.statusPageTheme) {
		config.statusPageTheme = 'light';
	}

	if (!config.statusPagePublished) {
		config.statusPagePublished = true;
	}

	if (!config.statusPageTags) {
		config.statusPageTags = false;
	}

	if (!config.title) {
		config.title = 'Uptime Kuma';
	}

	response.json(config);
});

// Status Page - Get the current Incident
// Can fetch only if published
router.get('/api/status-page/incident', async (_, response) => {
	allowDevAllOrigin(response);

	try {
		await checkPublished();

		let incident = await R.findOne('incident', ' pin = 1 AND active = 1');

		if (incident) {
			incident = incident.toPublicJSON();
		}

		response.json({
			ok: true,
			incident,
		});
	} catch (error) {
		send403(response, error.message);
	}
});

// Status Page - Monitor List
// Can fetch only if published
router.get('/api/status-page/monitor-list', cache('5 minutes'), async (_request, response) => {
	allowDevAllOrigin(response);

	try {
		await checkPublished();
		const publicGroupList = [];
		const tagsVisible = (await getSettings('statusPage')).statusPageTags;
		const list = await R.find('group', ' public = 1 ORDER BY weight ');
		for (let groupBean of list) {
			let monitorGroup = await groupBean.toPublicJSON();
			if (tagsVisible) {
				monitorGroup.monitorList = await Promise.all(
					monitorGroup.monitorList.map(async (monitor) => {
						// Includes tags as an array in response, allows for tags to be displayed on public status page
						const tags = await R.getAll(
							`SELECT monitor_tag.monitor_id, monitor_tag.value, tag.name, tag.color
                            FROM monitor_tag
                            JOIN tag
                            ON monitor_tag.tag_id = tag.id
                            WHERE monitor_tag.monitor_id = ?`,
							[monitor.id]
						);
						return {
							...monitor,
							tags: tags,
						};
					})
				);
			}

			publicGroupList.push(monitorGroup);
		}

		response.json(publicGroupList);
	} catch (error) {
		send403(response, error.message);
	}
});

// Status Page Polling Data
// Can fetch only if published
router.get('/api/status-page/heartbeat', cache('5 minutes'), async (_request, response) => {
	allowDevAllOrigin(response);

	try {
		await checkPublished();

		let heartbeatList = {};
		let uptimeList = {};

		let monitorIDList = await R.getCol(`
            SELECT monitor_group.monitor_id FROM monitor_group, \`group\`
            WHERE monitor_group.group_id = \`group\`.id
            AND public = 1
        `);

		for (let monitorID of monitorIDList) {
			let list = await R.getAll(
				`
                    SELECT * FROM heartbeat
                    WHERE monitor_id = ?
                    ORDER BY time DESC
                    LIMIT 50
            `,
				[monitorID]
			);

			list = R.convertToBeans('heartbeat', list);
			heartbeatList[monitorID] = list.reverse().map((row) => row.toPublicJSON());

			const type = 24;
			uptimeList[`${monitorID}_${type}`] = await Monitor.calcUptime(type, monitorID);
		}

		response.json({
			heartbeatList,
			uptimeList,
		});
	} catch (error) {
		send403(response, error.message);
	}
});

async function checkPublished() {
	if (!(await isPublished())) {
		throw new Error('The status page is not published');
	}
}

/**
 * Default is published
 * @returns {Promise<boolean>}
 */
async function isPublished() {
	const value = await setting('statusPagePublished');
	if (value === null) {
		return true;
	}
	return value;
}

function send403(res, msg = '') {
	res.status(403).json({
		status: 'fail',
		msg: msg,
	});
}

module.exports = router;