import { sqlite } from "../init.js"
import Level from '../../../schemas/Level.js'
import Player from '../../../schemas/Player.js'
import Finish from '../../../schemas/Finish.js'
import initLog from '../../utils/log.js'


const log = initLog("sqlite2mongo")

/**
 * This for new maps from the sqlite db. If any are found it adds them to mongodb.
 * @module libs/database/sqlite2mongo/checks
 */
export async function checkForMaps() {
    log("Checking for new maps...")

    const latestMap = await Level.findOne({}).sort({ "release": "desc" })
    const date = latestMap ? latestMap.release.toISOString().replace(/[TZ]/g, " ").replace(/\.[0-9\s]+/, "") : undefined
    const newMapsAmount = (await sqlite.get(`SELECT count(Map) FROM maps ${date ? `WHERE Timestamp > datetime('${date}')` : ''} ORDER BY Timestamp`))['count(Map)']
    log(`Found ${newMapsAmount} new maps!`)

    let addedMaps = 0
    await sqlite.each(
        `SELECT Map, Server, Points, Stars, Mapper, Timestamp FROM maps ${date ? `WHERE Timestamp > datetime('${date}')` : ''} ORDER BY Timestamp`,
        [],
        (err, map) => {
            if (err) return log(err)

            Level.create({
                name: map.Map,
                mapper: map.Mapper,
                release: map.Timestamp === '0000-00-00 00:00:00' ? new Date('January 1, 1970 00:00:00 UTC') : new Date(`${map.Timestamp}+00:00`),
                category: map.Server,
                rating: map.Stars,
                awardPoints: map.Points
            }).then(() => {
                ++addedMaps
                log(`Added map ${addedMaps}/${newMapsAmount} -> ${map.Map}`)
            })
        }
    )
}


/**
 * This checks for new players in the sqlite db. If any are found it adds them to mongodb.
 * @module libs/database/sqlite2mongo/checks
 */
export async function checkForPlayers() {
    log("Checking for new players...")

    const latestPlayer = await Player.findOne({}).sort({ "firstFinish": "desc" })
    const date = latestPlayer ? latestPlayer.firstFinish.toISOString().replace(/[TZ]/g, " ").replace(/\.[0-9\s]+/, "") : undefined
    const newPlayerAmount = (await sqlite.get(`select count(Name) FROM (SELECT Name, Timestamp FROM (SELECT Name, Timestamp FROM (SELECT * FROM race ORDER BY Timestamp ASC, Name ASC) GROUP BY Name) ${date ? `WHERE Timestamp > datetime('${date}')` : ''} ORDER BY Timestamp ASC)`))['count(Name)']
    if (newPlayerAmount === 0) return log("No new players found...")

    // Create a temporary table to prevent re-running CPU-intensive queries.
    log(`Found ${newPlayerAmount} new players!`)
    log("Importing new players...")
    await sqlite.exec("DROP TABLE IF EXISTS temp")
    await sqlite.exec("CREATE TABLE temp(Name varchar(128) NOT NULL, Timestamp timestamp NOT NULL)")
    await sqlite.exec(`INSERT INTO TEMP (Name, Timestamp) SELECT Name, Timestamp FROM (SELECT Name, Timestamp FROM (SELECT Name, Timestamp FROM (SELECT * FROM race ORDER BY Timestamp ASC, Name ASC) GROUP BY Name) ${date ? `WHERE Timestamp > datetime('${date}')` : ''} ORDER BY Timestamp ASC)`)
    log("Imported new players into 'temp'!")

    let addedPlayers = 0
    let offset = -1
    while (offset < newPlayerAmount) {
        await sqlite.each(
            `SELECT Name, Timestamp FROM temp LIMIT 10000 OFFSET ${offset + 1}`,
            [],
            async (err, player) => {
                if (err) return log(err)
                if (addedPlayers >= newPlayerAmount) return {}

                Player.create({
                    name: player.Name,
                    firstFinish: player.Timestamp === '0000-00-00 00:00:00' ? new Date('January 1, 1970 00:00:00 UTC') : new Date(`${player.Timestamp}+00:00`)
                }).then(() => {
                    ++addedPlayers
                    log(`Added player ${addedPlayers}/${newPlayerAmount} -> ${player.Name}`)
                })
            }
        )
        offset += 10000
    }
}

/**
 * This checks for new finishes in the sqlite db. If any are found it adds them to mongodb.
 * @module libs/database/sqlite2mongo/checks
 */
export async function checkForFinishes() {
    log("Checking for new finishes...")

    const latestFinish = await Finish.findOne({}).sort({ "date": "desc" })
    const date = latestFinish ? latestFinish.date.toISOString().replace(/[TZ]/g, " ").replace(/\.[0-9\s]+/, "") : undefined
    const newFinishAmount = (await sqlite.get(`SELECT count(Name) FROM race ${date ? `WHERE Timestamp > datetime('${date}')` : ''}`))['count(Name)']
    if (newFinishAmount === 0) return log("No new finishes found...")

    log(`Found ${newFinishAmount} new finishes!`)

    let addedFinishes = 0
    let offset = -1
    while (offset < newFinishAmount) {
        await sqlite.each(
            `SELECT * FROM race ${date ? `WHERE Timestamp > datetime('${date}')` : ''} ORDER BY Timestamp LIMIT 5000 OFFSET ${offset + 1}`,
            [],
            async (err, finish) => {
                if (err) return log(err)
                if (addedFinishes >= newFinishAmount) return {}

                Finish.create({
                    map: finish.Map,
                    time: finish.Time,
                    date: finish.Timestamp === '0000-00-00 00:00:00' ? new Date('January 1, 1970 00:00:00 UTC') : new Date(`${finish.Timestamp}+00:00`),
                    serverLocation: finish.Server ?? '',
                    player: finish.Name
                }).then(() => {
                    ++addedFinishes
                    log(`Added finish ${addedFinishes}/${newFinishAmount} -> At ${finish.Timestamp} «${finish.Name}» completed «${finish.Map}» in ${finish.Time} s`)
                })
            }
        )
        offset += 5000
    }
}