import { sqlite } from './init.js'

/**
 * This function checks if a player exists
 * 
 * @param {string} player The player to check

 * @returns {boolean} Returns a boolean
 */
export function playerExists(player) {
    const exists = sqlite.prepare(`SELECT * FROM points WHERE player = ? LIMIT 1`).get(player)

    if(exists)
        return true
    else
        return false
}

/**
 * This function checks if a map exists
 * 
 * @param {string} player The map to check

 * @returns {boolean} Returns a boolean
 */
export function mapExists(map) {
    const exists = sqlite.prepare(`SELECT * FROM maps WHERE map = ? LIMIT 1`).get(map)

    if(exists)
        return true
    else
        return false
}

/**
 * This function checks if a map category exists
 * 
 * @param {string} player The category to check

 * @returns {boolean} Returns a boolean
 */
 export function categoryExists(category) {
    const exists = sqlite.prepare(`SELECT category FROM maps WHERE category = ? LIMIT 1`).get(category)

    if(exists)
        return true
    else
        return false
}

/**
 * This function returns all data pertaining a certain player
 * 
 * @param {string} player The player to fetch

 * @returns {object} An object containing the players data
 */
export function player(player) {
    /* Misc */
    const firstFinish = sqlite.prepare(`SELECT map, time, date, server FROM race WHERE player = ? ORDER BY date ASC LIMIT 1`).get(player)

    if(!firstFinish)
        return undefined

    /* Points */
    let points = {}
    let rank = {}

    const pointsData = sqlite.prepare(`SELECT * FROM points WHERE player = ?`)

    for (const pointsType of pointsData.iterate(player)) {
        rank[pointsType.type] = pointsType.rank
    }
    for (const pointsType of pointsData.iterate(player)) {
        points[pointsType.type] = pointsType.points
    }

    return {
        player,
        firstFinish,
        points,
        rank,
    }
}

/**
 * This function returns all data pertaining a certain map
 * 
 * @param {string} map The map to fetch

 * @returns {object} An object containing map data
 */
export function map(map) {
    const a = sqlite.prepare(`
        SELECT * FROM maps WHERE map = ?
    `).get(map)

    return prettyifyMap(a)
}

export function mapCategory(category) {
    let output = []
    const maps = sqlite.prepare(`
        SELECT * FROM maps WHERE category = ?`).all(category)

    if(!maps)
        return undefined

    for(const map of maps) {
        output.push(prettyifyMap(map))
    }
    return output
}

/**
 * This function returns all data pertaining to all maps

 * @returns {array} An array contaning all map objects
 */
export function allMaps() {
    let output = []
    const maps = sqlite.prepare(`
        SELECT * FROM maps`).all()

    for(const map of maps) {
        output.push(prettyifyMap(map))
    }
    return output
}

/**
 * This function returns all data pertaining a certain map
 * 
 * @param {string} map The map to fetch

 * @returns {object} An object containing map data
 */
 export function prettyifyMap(a) {
    if(!a)
        return undefined

    let output = {
        map: a.map,
        category: a.category,
        points: a.points,
        stars: a.stars,
        release: a.release,
        mappers: a.mapper.split(" & "),

        times: {
            average: a.avgTime,
            median: a.medianTime,
            topTime: a.topTime,
            topTimeTeam: (a.topTeamTime != -1) ? a.topTeamTime : undefined,
        },
        finishes: {
            total: a.finishesTotal,
            team: a.finishesTeam,
            unique: a.finishesUnique,
        }
    }

    return output
}

/**
 * This function returns the race leaderboard for a map
 * 
 * @param {string} map The map to check
 * @param {number} start At which rank the leaderboard should begin
 * @param {number} end At which rank the leaderboard should end

 * @returns {array} An array containing the leaderboard
 */
export function leaderboardRace(map, start, end) {
    const leaderboard = sqlite.prepare(`
        SELECT rank, time, date, player, server FROM rankings WHERE map = ? LIMIT ?, ?`)
    .all(map, start -1, end)

    return leaderboard
}

/**
 * This function returns the teamrace leaderboard for a map
 * 
 * @param {string} map The map to check
 * @param {number} start At which rank the leaderboard should begin
 * @param {number} end At which rank the leaderboard should end

 * @returns {array} An array containing the leaderboard
 */
 export function leaderboardTeamrace(map, start, end) {
    // TODO: Optimize array creation of players
    let leaderboard = []

    const a = sqlite.prepare(`
        SELECT teamrank, time, date, player, server FROM teamrankings WHERE map = ? AND teamrank >= ? AND teamrank <= ? GROUP BY teamrank`)

    for(const teamrank of a.iterate(map, start, end)) {
        let players = []
        const b = sqlite.prepare(`SELECT player FROM teamrankings WHERE map = ? AND teamrank = ?`)

        if(!b)
            return undefined

        for(const player of b.iterate(map, teamrank.teamrank)) {
            players.push(player.player)
        }
        leaderboard.push({
            teamrank: teamrank.teamrank,
            time: teamrank.time,
            date: teamrank.date,
            server: teamrank.server,
            players: players,
        })
    }
    return leaderboard
}

/**
 * This function returns the points leaderboard for a specific type
 * (points, pointsRank, pointsTeam, pointsThisWeek, pointsThisMonth)
 * 
 * @param {string} type Which type of points to fetch
 * @param {number} start At which rank the leaderboard should begin
 * @param {number} end At which rank the leaderboard should end

 * @returns {array} An array containing the leaderboard
 */
export function leaderboardPoints(map, start, end) {
    const leaderboard = sqlite.prepare(`
        SELECT rank, player, points FROM points WHERE type = ? AND rank >= ? AND rank <= ? ORDER BY rank`)
    .all(type, start, end)

    return leaderboard
}

/**
 * This function returns all finished maps by a specific player
 * togheter with their respective rank, teamrank, amount of finishes.
 * Finishes are grouped by map category (Novice, Brutal)
 * 
 * @param {string} player The player to check

 * @returns {object} An object containing all finishes grouped by category
 */
export function finishedMaps(player) {
    const finishesStmt = sqlite.prepare(
    `
        SELECT a.map,
               a.category,
               a.points,
               a.rank,
               b.teamrank,
               a.finishes
        FROM   rankings AS a
            LEFT OUTER JOIN teamrankings AS b
                        ON a.player = b.player
                            AND a.category = b.category
                            AND a.map = b.map
        WHERE  a.player = ?
    `)

    if(!finishesStmt)
        return undefined

    let finishes = {
        Novice: [],
        Moderate: [],
        Brutal: [],
        Insane: [],
        Dummy: [],
        DDmaX: [],
        Oldschool: [],
        Solo: [],
        Race: [],
        Fun: []
    }
    for (const finish of finishesStmt.iterate(player)) {
        finishes[finish.category].push(finish)
    }

    return finishes
}

/**
 * This function returns all unfinished maps by a specific player
 * togheter with category, points, finishTotal and medianTime.
 * Maps are grouped by the map category (Novice, Brutal)
 * 
 * @param {string} player The player to check

 * @returns {object} An object containing all unfinished maps
 */
 export function unfinishedMaps(player) {
    const maps = sqlite.prepare(
    `
        SELECT a.map,
               a.category,
               a.points,
               b.finishesTotal,
               b.medianTime
        FROM   (SELECT category,
                       map,
                       points
                FROM   maps
                WHERE  map NOT IN (SELECT map
                                FROM   rankings
                                WHERE  player = ? )) AS a
            JOIN maps AS b
                ON a.category = b.category
                    AND a.map = b.map
        ORDER  BY b.category ASC; 
    `)

    if(!maps)
        return undefined

    let unfinished = {
        Novice: [],
        Moderate: [],
        Brutal: [],
        Insane: [],
        Dummy: [],
        DDmaX: [],
        Oldschool: [],
        Solo: [],
        Race: [],
        Fun: []
    }
    for (const map of maps.iterate(player)) {
        unfinished[map.category].push(map)
    }

    return unfinished
}

export function graphMap(map) {
    const finishes = sqlite.prepare(`SELECT * FROM graphRecordCache WHERE map = ? ORDER BY date`)

    if(!finishes)
        return undefined

    let array = []
    for (const record of finishes.iterate(map))
            array.push({ t: record.date, y: record.time, player: record.player})

    return array
}
export default {
    playerExists,
    finishedMaps,
    unfinishedMaps,
    player,

    map,
    graphMap,
    mapCategory,
    allMaps,
    mapExists,
    leaderboardRace,
    leaderboardTeamrace,
    categoryExists,
}