import {config} from '../config';
import {Logger} from '../utils/logger';
import {db, privateDB} from '../databases/databases';
import {YouTubeAPI} from '../utils/youtubeApi';
import {getSubmissionUUID} from '../utils/getSubmissionUUID';
import fetch from 'node-fetch';
import isoDurations from 'iso8601-duration';
import {getHash} from '../utils/getHash';
import {getIP} from '../utils/getIP';
import {getFormattedTime} from '../utils/getFormattedTime';
import {isUserTrustworthy} from '../utils/isUserTrustworthy';
import {dispatchEvent} from '../utils/webhookUtils';
import {Request, Response} from 'express';
import { skipSegmentsKey } from '../middleware/redisKeys';
import redis from '../utils/redis';


async function sendWebhookNotification(userID: string, videoID: string, UUID: string, submissionCount: number, youtubeData: any, {submissionStart, submissionEnd}: { submissionStart: number; submissionEnd: number; }, segmentInfo: any) {
    const row = await db.prepare('get', `SELECT "userName" FROM "userNames" WHERE "userID" = ?`, [userID]);
    const userName = row !== undefined ? row.userName : null;
    const video = youtubeData.items[0];

    let scopeName = "submissions.other";
    if (submissionCount <= 1) {
        scopeName = "submissions.new";
    }

    dispatchEvent(scopeName, {
        "video": {
            "id": videoID,
            "title": video.snippet.title,
            "thumbnail": video.snippet.thumbnails.maxres ? video.snippet.thumbnails.maxres : null,
            "url": "https://www.youtube.com/watch?v=" + videoID,
        },
        "submission": {
            "UUID": UUID,
            "category": segmentInfo.category,
            "startTime": submissionStart,
            "endTime": submissionEnd,
            "user": {
                "UUID": userID,
                "username": userName,
            },
        },
    });
}

async function sendWebhooks(userID: string, videoID: string, UUID: string, segmentInfo: any) {
    if (config.youtubeAPIKey !== null) {
        const userSubmissionCountRow = await db.prepare('get', `SELECT count(*) as "submissionCount" FROM "sponsorTimes" WHERE "userID" = ?`, [userID]);

        YouTubeAPI.listVideos(videoID, (err: any, data: any) => {
            if (err || data.items.length === 0) {
                err && Logger.error(err);
                return;
            }

            const startTime = parseFloat(segmentInfo.segment[0]);
            const endTime = parseFloat(segmentInfo.segment[1]);
            sendWebhookNotification(userID, videoID, UUID, userSubmissionCountRow.submissionCount, data, {
                submissionStart: startTime,
                submissionEnd: endTime,
            }, segmentInfo);

            // If it is a first time submission
            // Then send a notification to discord
            if (config.discordFirstTimeSubmissionsWebhookURL === null || userSubmissionCountRow.submissionCount > 1) return;
            
            fetch(config.discordFirstTimeSubmissionsWebhookURL, {
                method: 'POST',
                body: JSON.stringify({
                    "embeds": [{
                        "title": data.items[0].snippet.title,
                        "url": "https://www.youtube.com/watch?v=" + videoID + "&t=" + (parseInt(startTime.toFixed(0)) - 2),
                        "description": "Submission ID: " + UUID +
                            "\n\nTimestamp: " +
                            getFormattedTime(startTime) + " to " + getFormattedTime(endTime) +
                            "\n\nCategory: " + segmentInfo.category,
                        "color": 10813440,
                        "author": {
                            "name": userID,
                        },
                        "thumbnail": {
                            "url": data.items[0].snippet.thumbnails.maxres ? data.items[0].snippet.thumbnails.maxres.url : "",
                        },
                    }],
                }),
                headers: {
                    'Content-Type': 'application/json'
                }
            })
            .then(res => {
                if (res.status >= 400) {
                    Logger.error("Error sending first time submission Discord hook");
                    Logger.error(JSON.stringify(res));
                    Logger.error("\n");
                }
            })
            .catch(err => {
                Logger.error("Failed to send first time submission Discord hook.");
                Logger.error(JSON.stringify(err));
                Logger.error("\n");
            });
        });
    }
}

async function sendWebhooksNB(userID: string, videoID: string, UUID: string, startTime: number, endTime: number, category: string, probability: number, ytData: any) {
    const submissionInfoRow = await db.prepare('get', `SELECT
        (select count(1) from "sponsorTimes" where "userID" = ?) count,
        (select count(1) from "sponsorTimes" where "userID" = ? and "votes" <= -2) disregarded,
        coalesce((select "userName" FROM "userNames" WHERE "userID" = ?), ?) "userName"`,
        [userID, userID, userID, userID]);

    let submittedBy: string;
    // If a userName was created then show both
    if (submissionInfoRow.userName !== userID) {
        submittedBy = submissionInfoRow.userName + "\n " + userID;
    } else {
        submittedBy = userID;
    }

    // Send discord message
    if (config.discordNeuralBlockRejectWebhookURL === null) return;
    
    fetch(config.discordNeuralBlockRejectWebhookURL, {
        method: 'POST',
        body: JSON.stringify({
            "embeds": [{
                "title": ytData.items[0].snippet.title,
                "url": "https://www.youtube.com/watch?v=" + videoID + "&t=" + (parseFloat(startTime.toFixed(0)) - 2),
                "description": "**Submission ID:** " + UUID +
                    "\n**Timestamp:** " + getFormattedTime(startTime) + " to " + getFormattedTime(endTime) +
                    "\n**Predicted Probability:** " + probability +
                    "\n**Category:** " + category +
                    "\n**Submitted by:** " + submittedBy +
                    "\n**Total User Submissions:** " + submissionInfoRow.count +
                    "\n**Ignored User Submissions:** " + submissionInfoRow.disregarded,
                "color": 10813440,
                "thumbnail": {
                    "url": ytData.items[0].snippet.thumbnails.maxres ? ytData.items[0].snippet.thumbnails.maxres.url : "",
                },
            }],
        }),
        headers: {
            'Content-Type': 'application/json'
        }
    })
    .then(res => {
        if (res.status >= 400) {
            Logger.error("Error sending NeuralBlock Discord hook");
            Logger.error(JSON.stringify(res));
            Logger.error("\n");
        }
    })
    .catch(err => {
        Logger.error("Failed to send NeuralBlock Discord hook.");
        Logger.error(JSON.stringify(err));
        Logger.error("\n");
    });
}

// callback:  function(reject: "String containing reason the submission was rejected")
// returns: string when an error, false otherwise

// Looks like this was broken for no defined youtube key - fixed but IMO we shouldn't return
//   false for a pass - it was confusing and lead to this bug - any use of this function in
//   the future could have the same problem.
async function autoModerateSubmission(submission: { videoID: any; userID: any; segments: any }) {
    // Get the video information from the youtube API
    if (config.youtubeAPIKey !== null) {
        const {err, data} = await new Promise((resolve) => {
            YouTubeAPI.listVideos(submission.videoID, (err: any, data: any) => resolve({err, data}));
        });

        if (err) {
            return false;
        } else {
            // Check to see if video exists
            if (data.pageInfo.totalResults === 0) {
                return "No video exists with id " + submission.videoID;
            } else {
                const segments = submission.segments;
                let nbString = "";
                for (let i = 0; i < segments.length; i++) {
                    const startTime = parseFloat(segments[i].segment[0]);
                    const endTime = parseFloat(segments[i].segment[1]);

                    let duration = data.items[0].contentDetails.duration;
                    duration = isoDurations.toSeconds(isoDurations.parse(duration));
                    if (duration == 0) {
                        // Allow submission if the duration is 0 (bug in youtube api)
                        return false;
                    } else if ((endTime - startTime) > (duration / 100) * 80) {
                        // Reject submission if over 80% of the video
                        return "One of your submitted segments is over 80% of the video.";
                    } else {
                        if (segments[i].category === "sponsor") {
                            //Prepare timestamps to send to NB all at once
                            nbString = nbString + segments[i].segment[0] + "," + segments[i].segment[1] + ";";
                        }
                    }
                }
                // Check NeuralBlock
                const neuralBlockURL = config.neuralBlockURL;
                if (!neuralBlockURL) return false;
                const response = await fetch(neuralBlockURL + "/api/checkSponsorSegments?vid=" + submission.videoID +
                    "&segments=" + nbString.substring(0, nbString.length - 1));
                if (!response.ok) return false;

                const nbPredictions = await response.json();
                let nbDecision = false;
                let predictionIdx = 0; //Keep track because only sponsor categories were submitted
                for (let i = 0; i < segments.length; i++) {
                    if (segments[i].category === "sponsor") {
                        if (nbPredictions.probabilities[predictionIdx] < 0.70) {
                            nbDecision = true; // At least one bad entry
                            const startTime = parseFloat(segments[i].segment[0]);
                            const endTime = parseFloat(segments[i].segment[1]);

                            const UUID = getSubmissionUUID(submission.videoID, segments[i].category, submission.userID, startTime, endTime);
                            // Send to Discord
                            // Note, if this is too spammy. Consider sending all the segments as one Webhook
                            sendWebhooksNB(submission.userID, submission.videoID, UUID, startTime, endTime, segments[i].category, nbPredictions.probabilities[predictionIdx], data);
                        }
                        predictionIdx++;
                    }

                }
                if (nbDecision) {
                    return "Rejected based on NeuralBlock predictions.";
                } else {
                    return false;
                }
            }
        }
    } else {
        Logger.debug("Skipped YouTube API");

        // Can't moderate the submission without calling the youtube API
        // so allow by default.
        return false;
    }
}

function proxySubmission(req: Request) {
    fetch(config.proxySubmission + '/api/skipSegments?userID=' + req.query.userID + '&videoID=' + req.query.videoID, {
            method: 'POST',
            body: req.body,
        })
        .then(async res => {
            if (config.mode === 'development') {
                Logger.debug('Proxy Submission: ' + res.status + ' (' + (await res.text()) + ')');
            }
        })
        .catch(err => {
            if (config.mode === 'development') {
                Logger.error("Proxy Submission: Failed to make call");
            }
        });
}

export async function postSkipSegments(req: Request, res: Response) {
    if (config.proxySubmission) {
        proxySubmission(req);
    }

    const videoID = req.query.videoID || req.body.videoID;
    let userID = req.query.userID || req.body.userID;


    let segments = req.body.segments;
    if (segments === undefined) {
        // Use query instead
        segments = [{
            segment: [req.query.startTime, req.query.endTime],
            category: req.query.category,
        }];
    }

    const invalidFields = [];
    if (typeof videoID !== 'string') {
      invalidFields.push('videoID');
    }
    if (typeof userID !== 'string') {
      invalidFields.push('userID');
    }
    if (!Array.isArray(segments) || segments.length < 1) {
      invalidFields.push('segments');
    }

    if (invalidFields.length !== 0) {
      // invalid request
      const fields = invalidFields.reduce((p, c, i) => p + (i !== 0 ? ', ' : '') + c, '');
      res.status(400).send(`No valid ${fields} field(s) provided`);
      return;
    }

    //hash the userID
    userID = getHash(userID);

    //hash the ip 5000 times so no one can get it from the database
    const hashedIP = getHash(getIP(req) + config.globalSalt);

    const MILLISECONDS_IN_HOUR = 3600000;
    const now = Date.now();
    const warningsCount = (await db.prepare('get', `SELECT count(1) as count FROM warnings WHERE "userID" = ? AND "issueTime" > ? AND enabled = 1`,
        [userID, Math.floor(now - (config.hoursAfterWarningExpires * MILLISECONDS_IN_HOUR))],
    )).count;

    if (warningsCount >= config.maxNumberOfActiveWarnings) {
        return res.status(403).send('Submission rejected due to a warning from a moderator. This means that we noticed you were making some common mistakes that are not malicious, and we just want to clarify the rules. Could you please send a message in Discord or Matrix so we can further help you?');
    }

    const noSegmentList = (await db.prepare('all', 'SELECT category from "noSegments" where "videoID" = ?', [videoID])).map((list: any) => {
        return list.category;
    });

    //check if this user is on the vip list
    const isVIP = (await db.prepare("get", `SELECT count(*) as "userCount" FROM "vipUsers" WHERE "userID" = ?`, [userID])).userCount > 0;

    const decreaseVotes = 0;

    // Check if all submissions are correct
    for (let i = 0; i < segments.length; i++) {
        if (segments[i] === undefined || segments[i].segment === undefined || segments[i].category === undefined) {
            //invalid request
            res.status(400).send("One of your segments are invalid");
            return;
        }

        if (!config.categoryList.includes(segments[i].category)) {
            res.status(400).send("Category doesn't exist.");
            return;
        }

        // Reject segemnt if it's in the no segments list
        if (!isVIP && noSegmentList.indexOf(segments[i].category) !== -1) {
            // TODO: Do something about the fradulent submission
            Logger.warn("Caught a no-segment submission. userID: '" + userID + "', videoID: '" + videoID + "', category: '" + segments[i].category + "'");
            res.status(403).send(
                "Request rejected by auto moderator: New submissions are not allowed for the following category: '"
                + segments[i].category + "'. A moderator has decided that no new segments are needed and that all current segments of this category are timed perfectly.\n\n "
                + (segments[i].category === "sponsor" ? "Maybe the segment you are submitting is a different category that you have not enabled and is not a sponsor. " +
                "Categories that aren't sponsor, such as self-promotion can be enabled in the options.\n\n " : "")
                + "If you believe this is incorrect, please contact someone on Discord.",
            );
            return;
        }


        let startTime = parseFloat(segments[i].segment[0]);
        let endTime = parseFloat(segments[i].segment[1]);

        if (isNaN(startTime) || isNaN(endTime)
            || startTime === Infinity || endTime === Infinity || startTime < 0 || startTime >= endTime) {
            //invalid request
            res.status(400).send("One of your segments times are invalid (too short, startTime before endTime, etc.)");
            return;
        }

        if (!isVIP && segments[i].category === "sponsor" && Math.abs(startTime - endTime) < 1) {
            // Too short
            res.status(400).send("Sponsors must be longer than 1 second long");
            return;
        }

        //check if this info has already been submitted before
        const duplicateCheck2Row = await db.prepare('get', `SELECT COUNT(*) as count FROM "sponsorTimes" WHERE "startTime" = ?
            and "endTime" = ? and "category" = ? and "videoID" = ?`, [startTime, endTime, segments[i].category, videoID]);
        if (duplicateCheck2Row.count > 0) {
            res.sendStatus(409);
            return;
        }
    }

    // Auto moderator check
    if (!isVIP) {
        const autoModerateResult = await autoModerateSubmission({userID, videoID, segments});//startTime, endTime, category: segments[i].category});
        if (autoModerateResult == "Rejected based on NeuralBlock predictions.") {
            // If NB automod rejects, the submission will start with -2 votes.
            // Note, if one submission is bad all submissions will be affected.
            // However, this behavior is consistent with other automod functions
            // already in place.
            //decreaseVotes = -2; //Disable for now
        } else if (autoModerateResult) {
            //Normal automod behavior
            res.status(403).send("Request rejected by auto moderator: " + autoModerateResult + " If this is an issue, send a message on Discord.");
            return;
        }
    }
    // Will be filled when submitting
    const UUIDs = [];

    try {
        //get current time
        const timeSubmitted = Date.now();

        const yesterday = timeSubmitted - 86400000;

        // Disable IP ratelimiting for now
        if (false) {
            //check to see if this ip has submitted too many sponsors today
            const rateLimitCheckRow = await privateDB.prepare('get', `SELECT COUNT(*) as count FROM "sponsorTimes" WHERE "hashedIP" = ? AND "videoID" = ? AND "timeSubmitted" > ?`, [hashedIP, videoID, yesterday]);

            if (rateLimitCheckRow.count >= 10) {
                //too many sponsors for the same video from the same ip address
                res.sendStatus(429);

                return;
            }
        }

        // Disable max submissions for now
        if (false) {
            //check to see if the user has already submitted sponsors for this video
            const duplicateCheckRow = await db.prepare('get', `SELECT COUNT(*) as count FROM "sponsorTimes" WHERE "userID" = ? and "videoID" = ?`, [userID, videoID]);

            if (duplicateCheckRow.count >= 16) {
                //too many sponsors for the same video from the same user
                res.sendStatus(429);

                return;
            }
        }

        //check to see if this user is shadowbanned
        const shadowBanRow = await privateDB.prepare('get', `SELECT count(*) as "userCount" FROM "shadowBannedUsers" WHERE "userID" = ?`, [userID]);

        let shadowBanned = shadowBanRow.userCount;

        if (!(await isUserTrustworthy(userID))) {
            //hide this submission as this user is untrustworthy
            shadowBanned = 1;
        }

        let startingVotes = 0 + decreaseVotes;

        if (config.youtubeAPIKey !== null) {
            let {err, data} = await new Promise((resolve) => {
                YouTubeAPI.listVideos(videoID, (err: any, data: any) => resolve({err, data}));
            });

            if (err) {
                Logger.error("Error while submitting when connecting to YouTube API: " + err);
            } else {
                //get all segments for this video and user
                const allSubmittedByUser = await db.prepare('all', `SELECT "startTime", "endTime" FROM "sponsorTimes" WHERE "userID" = ? and "videoID" = ? and "votes" > -1`, [userID, videoID]);
                const allSegmentTimes = [];
                if (allSubmittedByUser !== undefined) {
                    //add segments the user has previously submitted
                    for (const segmentInfo of allSubmittedByUser) {
                        allSegmentTimes.push([parseFloat(segmentInfo.startTime), parseFloat(segmentInfo.endTime)]);
                    }
                }

                //add segments they are trying to add in this submission
                for (let i = 0; i < segments.length; i++) {
                    let startTime = parseFloat(segments[i].segment[0]);
                    let endTime = parseFloat(segments[i].segment[1]);
                    allSegmentTimes.push([startTime, endTime]);
                }

                //merge all the times into non-overlapping arrays
                const allSegmentsSorted = mergeTimeSegments(allSegmentTimes.sort(function (a, b) {
                    return a[0] - b[0] || a[1] - b[1];
                }));

                let videoDuration = data.items[0].contentDetails.duration;
                videoDuration = isoDurations.toSeconds(isoDurations.parse(videoDuration));
                if (videoDuration != 0) {
                    let allSegmentDuration = 0;
                    //sum all segment times together
                    allSegmentsSorted.forEach(segmentInfo => allSegmentDuration += segmentInfo[1] - segmentInfo[0]);
                    if (allSegmentDuration > (videoDuration / 100) * 80) {
                        // Reject submission if all segments combine are over 80% of the video
                        res.status(400).send("Total length of your submitted segments are over 80% of the video.");
                        return;
                    }
                }
            }
        }

        for (const segmentInfo of segments) {
            //this can just be a hash of the data
            //it's better than generating an actual UUID like what was used before
            //also better for duplication checking
            const UUID = getSubmissionUUID(videoID, segmentInfo.category, userID, segmentInfo.segment[0], segmentInfo.segment[1]);

            const startingLocked = isVIP ? 1 : 0;
            try {
                await db.prepare('run', `INSERT INTO "sponsorTimes" 
                    ("videoID", "startTime", "endTime", "votes", "locked", "UUID", "userID", "timeSubmitted", "views", "category", "shadowHidden", "hashedVideoID")
                    VALUES(?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?)`, [
                        videoID, segmentInfo.segment[0], segmentInfo.segment[1], startingVotes, startingLocked, UUID, userID, timeSubmitted, 0, segmentInfo.category, shadowBanned, getHash(videoID, 1),
                    ],
                );

                //add to private db as well
                await privateDB.prepare('run', `INSERT INTO "sponsorTimes" VALUES(?, ?, ?)`, [videoID, hashedIP, timeSubmitted]);
            
                // Clear redis cache for this video
                redis.delAsync(skipSegmentsKey(videoID));
            } catch (err) {
                //a DB change probably occurred
                res.sendStatus(502);
                Logger.error("Error when putting sponsorTime in the DB: " + videoID + ", " + segmentInfo.segment[0] + ", " +
                    segmentInfo.segment[1] + ", " + userID + ", " + segmentInfo.category + ". " + err);

                return;
            }

            UUIDs.push(UUID);
        }
    } catch (err) {
        Logger.error(err);

        res.sendStatus(500);

        return;
    }

    res.sendStatus(200);

    for (let i = 0; i < segments.length; i++) {
        sendWebhooks(userID, videoID, UUIDs[i], segments[i]);
    }
}

// Takes an array of arrays: 
// ex) 
// [
//     [3, 40], 
//     [50, 70], 
//     [60, 80], 
//     [100, 150]
// ] 
// => transforms to combining overlapping segments
// [
//     [3, 40],
//     [50, 80], 
//     [100, 150]
// ]
function mergeTimeSegments(ranges: number[][]) {
    const result: number[][] = [];
    let last: number[];

    ranges.forEach(function (r) {
        if (!last || r[0] > last[1])
            result.push(last = r);
        else if (r[1] > last[1])
            last[1] = r[1];
    });

    return result;
}