import { ConfigurationService } from '@ghostfolio/api/services/configuration/configuration.service';
import { FetchService } from '@ghostfolio/api/services/fetch/fetch.service';
import { PropertyService } from '@ghostfolio/api/services/property/property.service';
import {
  GATHER_STATISTICS_DOCKER_HUB_PULLS_PROCESS_JOB_NAME,
  GATHER_STATISTICS_GITHUB_CONTRIBUTORS_PROCESS_JOB_NAME,
  GATHER_STATISTICS_GITHUB_STARGAZERS_PROCESS_JOB_NAME,
  GATHER_STATISTICS_UPTIME_PROCESS_JOB_NAME,
  HEADER_KEY_TOKEN,
  PROPERTY_BETTER_UPTIME_MONITOR_ID,
  PROPERTY_DOCKER_HUB_PULLS,
  PROPERTY_GITHUB_CONTRIBUTORS,
  PROPERTY_GITHUB_STARGAZERS,
  PROPERTY_UPTIME,
  STATISTICS_GATHERING_QUEUE
} from '@ghostfolio/common/config';
import {
  DATE_FORMAT,
  extractNumberFromString
} from '@ghostfolio/common/helper';

import { Process, Processor } from '@nestjs/bull';
import { Injectable, Logger } from '@nestjs/common';
import * as cheerio from 'cheerio';
import { format, subDays } from 'date-fns';

@Injectable()
@Processor(STATISTICS_GATHERING_QUEUE)
export class StatisticsGatheringProcessor {
  private readonly logger = new Logger(StatisticsGatheringProcessor.name);

  public constructor(
    private readonly configurationService: ConfigurationService,
    private readonly fetchService: FetchService,
    private readonly propertyService: PropertyService
  ) {}

  @Process(GATHER_STATISTICS_DOCKER_HUB_PULLS_PROCESS_JOB_NAME)
  public async gatherDockerHubPullsStatistics() {
    this.logger.log('Docker Hub pulls statistics gathering has been started');

    const dockerHubPulls = await this.countDockerHubPulls();

    await this.propertyService.put({
      key: PROPERTY_DOCKER_HUB_PULLS,
      value: String(dockerHubPulls)
    });

    this.logger.log('Docker Hub pulls statistics gathering has been completed');
  }

  @Process(GATHER_STATISTICS_GITHUB_CONTRIBUTORS_PROCESS_JOB_NAME)
  public async gatherGitHubContributorsStatistics() {
    this.logger.log(
      'GitHub contributors statistics gathering has been started'
    );

    const gitHubContributors = await this.countGitHubContributors();

    await this.propertyService.put({
      key: PROPERTY_GITHUB_CONTRIBUTORS,
      value: String(gitHubContributors)
    });

    this.logger.log(
      'GitHub contributors statistics gathering has been completed'
    );
  }

  @Process(GATHER_STATISTICS_GITHUB_STARGAZERS_PROCESS_JOB_NAME)
  public async gatherGitHubStargazersStatistics() {
    this.logger.log('GitHub stargazers statistics gathering has been started');

    const gitHubStargazers = await this.countGitHubStargazers();

    await this.propertyService.put({
      key: PROPERTY_GITHUB_STARGAZERS,
      value: String(gitHubStargazers)
    });

    this.logger.log(
      'GitHub stargazers statistics gathering has been completed'
    );
  }

  @Process(GATHER_STATISTICS_UPTIME_PROCESS_JOB_NAME)
  public async gatherUptimeStatistics() {
    const monitorId = await this.propertyService.getByKey<string>(
      PROPERTY_BETTER_UPTIME_MONITOR_ID
    );

    if (!monitorId) {
      this.logger.log(
        `Uptime statistics gathering has been skipped as no ${PROPERTY_BETTER_UPTIME_MONITOR_ID} is configured`
      );

      return;
    }

    this.logger.log('Uptime statistics gathering has been started');

    const uptime = await this.getUptime(monitorId);

    await this.propertyService.put({
      key: PROPERTY_UPTIME,
      value: String(uptime)
    });

    this.logger.log('Uptime statistics gathering has been completed');
  }

  private async countDockerHubPulls(): Promise<number> {
    try {
      const { pull_count } = (await this.fetchService
        .fetch('https://hub.docker.com/v2/repositories/ghostfolio/ghostfolio', {
          headers: { 'User-Agent': 'request' },
          signal: AbortSignal.timeout(
            this.configurationService.get('REQUEST_TIMEOUT')
          )
        })
        .then((res) => res.json())) as { pull_count: number };

      return pull_count;
    } catch (error) {
      this.logger.error(error);

      throw error;
    }
  }

  private async countGitHubContributors(): Promise<number> {
    try {
      const body = await this.fetchService
        .fetch('https://github.com/ghostfolio/ghostfolio', {
          signal: AbortSignal.timeout(
            this.configurationService.get('REQUEST_TIMEOUT')
          )
        })
        .then((res) => res.text());

      const $ = cheerio.load(body);

      const value = $(
        'a[href="/ghostfolio/ghostfolio/graphs/contributors"] .Counter'
      ).text();

      if (!value) {
        throw new Error('Could not find the contributors count in the page');
      }

      return extractNumberFromString({
        value
      });
    } catch (error) {
      this.logger.error(error);

      throw error;
    }
  }

  private async countGitHubStargazers(): Promise<number> {
    try {
      const { stargazers_count } = (await this.fetchService
        .fetch('https://api.github.com/repos/ghostfolio/ghostfolio', {
          headers: { 'User-Agent': 'request' },
          signal: AbortSignal.timeout(
            this.configurationService.get('REQUEST_TIMEOUT')
          )
        })
        .then((res) => res.json())) as { stargazers_count: number };

      return stargazers_count;
    } catch (error) {
      this.logger.error(error);

      throw error;
    }
  }

  private async getUptime(monitorId: string): Promise<number> {
    try {
      const { data } = await this.fetchService
        .fetch(
          `https://uptime.betterstack.com/api/v2/monitors/${monitorId}/sla?from=${format(
            subDays(new Date(), 90),
            DATE_FORMAT
          )}&to${format(new Date(), DATE_FORMAT)}`,
          {
            headers: {
              [HEADER_KEY_TOKEN]: `Bearer ${this.configurationService.get(
                'API_KEY_BETTER_UPTIME'
              )}`
            },
            signal: AbortSignal.timeout(
              this.configurationService.get('REQUEST_TIMEOUT')
            )
          }
        )
        .then((res) => res.json());

      return data.attributes.availability / 100;
    } catch (error) {
      this.logger.error(error);

      throw error;
    }
  }
}