import { Injectable } from '@nestjs/common';
import { InjectDataSource, InjectRepository } from '@nestjs/typeorm';
import { DataSource, Repository } from 'typeorm';

import { ClientStatisticsEntity } from './client-statistics.entity';


@Injectable()
export class ClientStatisticsService {

    constructor(

        @InjectDataSource()
        private dataSource: DataSource,
        @InjectRepository(ClientStatisticsEntity)
        private clientStatisticsRepository: Repository<ClientStatisticsEntity>,
    ) {

    }

    public async save(clientStatistic: Partial<ClientStatisticsEntity>) {

        // Attempt to update the existing record
        const updateResult = await this.clientStatisticsRepository
            .createQueryBuilder()
            .update(ClientStatisticsEntity)
            .set({
                shares: () => `"shares" + :sharesIncrement`,
                acceptedCount: () => `"acceptedCount" + 1`
            })
            .where('address = :address AND clientName = :clientName AND sessionId = :sessionId AND time = :time', {
                address: clientStatistic.address,
                clientName: clientStatistic.clientName,
                sessionId: clientStatistic.sessionId,
                time: clientStatistic.time,
                sharesIncrement: clientStatistic.shares
            })
            .execute();

        // Check if the update affected any rows
        if (updateResult.affected === 0) {
            // If no rows were updated, insert a new record
            await this.clientStatisticsRepository.insert(clientStatistic);
        }

    }

    public async deleteOldStatistics() {
        const oneDayAgo = new Date(Date.now() - 24 * 60 * 60 * 1000);

        return await this.clientStatisticsRepository
            .createQueryBuilder()
            .delete()
            .from(ClientStatisticsEntity)
            .where('time < :time', { time: oneDayAgo.getTime() })
            .execute();
    }

    public async getChartDataForSite() {

        var yesterday = new Date(new Date().getTime() - (24 * 60 * 60 * 1000));

        const query = `
            SELECT
                time AS label,
                ROUND(((SUM(shares) * 4294967296) / 600)) AS data
            FROM
                client_statistics_entity AS entry
            WHERE
                entry.time > ${yesterday.getTime()}
            GROUP BY
                time
            ORDER BY
                time
            LIMIT 144;
    `;

        const result: any[] = await this.clientStatisticsRepository.query(query);


        return result.map(res => {
            res.label = new Date(parseInt(res.label)).toISOString();
            return res;
        }).slice(0, result.length - 1)

    }


    // public async getHashRateForAddress(address: string) {

    //     const oneHour = new Date(new Date().getTime() - (60 * 60 * 1000));

    //     const query = `
    //         SELECT
    //         SUM(entry.shares) AS difficultySum
    //         FROM
    //             client_statistics_entity AS entry
    //         WHERE
    //             entry.address = $1 AND entry.time > ${oneHour}
    //     `;

    //     const result = await this.clientStatisticsRepository.query(query, [address]);

    //     const difficultySum = result[0].difficultySum;

    //     return (difficultySum * 4294967296) / (600);

    // }

    public async getChartDataForAddress(address: string) {

        var yesterday = new Date(new Date().getTime() - (24 * 60 * 60 * 1000));

        const query = `
                SELECT
                    time AS label,
                    (SUM(shares) * 4294967296) / 600 AS data
                FROM
                    client_statistics_entity AS entry
                WHERE
                    entry.address = $1 AND entry.time > $2
                GROUP BY
                    time
                ORDER BY
                    time
                LIMIT 144;

        `;

        const result = await this.clientStatisticsRepository.query(query, [address, yesterday.getTime()]);

        return result.map(res => {
            res.label = new Date(parseInt(res.label)).toISOString();
            return res;
        }).slice(0, result.length - 1);


    }


    public async getHashRateForGroup(address: string, clientName: string) {

        var oneHour = new Date(new Date().getTime() - (60 * 60 * 1000));

        const query = `
            SELECT
            SUM(entry.shares) AS difficultySum
            FROM
                client_statistics_entity AS entry
            WHERE
                entry.address = $1 AND entry.clientName = $2 AND entry.time > ${oneHour.getTime()}
        `;

        const result = await this.clientStatisticsRepository.query(query, [address, clientName]);


        const difficultySum = result[0].difficultySum;

        return (difficultySum * 4294967296) / (600);

    }

    public async getChartDataForGroup(address: string, clientName: string) {
        var yesterday = new Date(new Date().getTime() - (24 * 60 * 60 * 1000));

        const query = `
            SELECT
                time AS label,
                (SUM(shares) * 4294967296) / 600 AS data
            FROM
                client_statistics_entity AS entry
            WHERE
                entry.address = $1 AND entry."clientName" = $2 AND entry.time > ${yesterday.getTime()}
            GROUP BY
                time
            ORDER BY
                time
            LIMIT 144;
        `;

        const result = await this.clientStatisticsRepository.query(query, [address, clientName]);

        return result.map(res => {
            res.label = new Date(parseInt(res.label)).toISOString();
            return res;
        }).slice(0, result.length - 1);


    }


    public async getHashRateForSession(address: string, clientName: string, sessionId: string) {

        const query = `
            SELECT
                "createdAt",
                "updatedAt",
                shares
            FROM
                client_statistics_entity AS entry
            WHERE
                entry.address = $1 AND entry."clientName" = $2 AND entry."sessionId" = $3
            ORDER BY time DESC
            LIMIT 2;
        `;

        const result = await this.clientStatisticsRepository.query(query, [address, clientName, sessionId]);

        if (result.length < 1) {
            return 0;
        }

        const latestStat = result[0];

        if (result.length < 2) {
            const time = new Date(latestStat.updatedAt).getTime() - new Date(latestStat.createdAt).getTime();
            if (time < 1) {
                return 0;
            }
            return (parseFloat(latestStat.shares) * 4294967296) / (time / 1000);
        } else {
            const secondLatestStat = result[1];
            const time = new Date(latestStat.updatedAt).getTime() - new Date(secondLatestStat.createdAt).getTime();
            if (time < 1) {
                return 0;
            }
            return ((parseFloat(latestStat.shares) + parseFloat(secondLatestStat.shares)) * 4294967296) / (time / 1000);
        }

    }

    public async getChartDataForSession(address: string, clientName: string, sessionId: string) {
        var yesterday = new Date(new Date().getTime() - (24 * 60 * 60 * 1000));

        const query = `
            SELECT
                time AS label,
                (SUM(shares) * 4294967296) / 600 AS data
            FROM
                client_statistics_entity AS entry
            WHERE
                entry.address = $1 AND entry."clientName" = $2 AND entry."sessionId" = $3 AND entry.time > ${yesterday.getTime()}
            GROUP BY
                time
            ORDER BY
                time
            LIMIT 144;
        `;

        const result = await this.clientStatisticsRepository.query(query, [address, clientName, sessionId]);

        return result.map(res => {
            res.label = new Date(parseInt(res.label)).toISOString();
            return res;
        }).slice(0, result.length - 1);

    }

    public async deleteAll() {
        return await this.clientStatisticsRepository.delete({})
    }
}