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, DOWN, flipStatus, debug } = 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 status = request.query.status || "true";
        status = status === "true" ? UP : DOWN;

        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);

        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;