import * as core from '@actions/core';
import {context, getOctokit} from '@actions/github';
import {GitHub} from '@actions/github/lib/utils';
import {Option} from '../enums/option';
import {getHumanizedDate} from '../functions/dates/get-humanized-date';
import {isDateMoreRecentThan} from '../functions/dates/is-date-more-recent-than';
import {isValidDate} from '../functions/dates/is-valid-date';
import {isBoolean} from '../functions/is-boolean';
import {isLabeled} from '../functions/is-labeled';
import {cleanLabel} from '../functions/clean-label';
import {shouldMarkWhenStale} from '../functions/should-mark-when-stale';
import {wordsToList} from '../functions/words-to-list';
import {IComment} from '../interfaces/comment';
import {IIssueEvent} from '../interfaces/issue-event';
import {IIssuesProcessorOptions} from '../interfaces/issues-processor-options';
import {IPullRequest} from '../interfaces/pull-request';
import {Assignees} from './assignees';
import {IgnoreUpdates} from './ignore-updates';
import {ExemptDraftPullRequest} from './exempt-draft-pull-request';
import {Issue} from './issue';
import {IssueLogger} from './loggers/issue-logger';
import {Logger} from './loggers/logger';
import {Milestones} from './milestones';
import {StaleOperations} from './stale-operations';
import {Statistics} from './statistics';
import {LoggerService} from '../services/logger.service';
import {OctokitIssue} from '../interfaces/issue';
import {retry} from '@octokit/plugin-retry';
import {IState} from '../interfaces/state/state';
import {IRateLimit} from '../interfaces/rate-limit';
import {RateLimit} from './rate-limit';
import {getSortField} from '../functions/get-sort-field';

/***
 * Handle processing of issues for staleness/closure.
 */

export class IssuesProcessor {
  private static _updatedSince(timestamp: string, num_days: number): boolean {
    const daysInMillis = 1000 * 60 * 60 * 24 * num_days;
    const millisSinceLastUpdated =
      new Date().getTime() - new Date(timestamp).getTime();

    return millisSinceLastUpdated <= daysInMillis;
  }

  private static _endIssueProcessing(issue: Issue): void {
    const consumedOperationsCount: number =
      issue.operations.getConsumedOperationsCount();

    if (consumedOperationsCount > 0) {
      const issueLogger: IssueLogger = new IssueLogger(issue);

      issueLogger.info(
        LoggerService.cyan(consumedOperationsCount),
        `operation${
          consumedOperationsCount > 1 ? 's' : ''
        } consumed for this $$type`
      );
    }
  }

  private static _getCloseLabelUsedOptionName(
    issue: Readonly<Issue>
  ): Option.ClosePrLabel | Option.CloseIssueLabel {
    return issue.isPullRequest ? Option.ClosePrLabel : Option.CloseIssueLabel;
  }

  readonly operations: StaleOperations;
  readonly client: InstanceType<typeof GitHub>;
  readonly options: IIssuesProcessorOptions;
  readonly staleIssues: Issue[] = [];
  readonly closedIssues: Issue[] = [];
  readonly deletedBranchIssues: Issue[] = [];
  readonly removedLabelIssues: Issue[] = [];
  readonly addedLabelIssues: Issue[] = [];
  readonly addedCloseCommentIssues: Issue[] = [];
  readonly statistics: Statistics | undefined;
  private readonly _logger: Logger = new Logger();
  private readonly state: IState;

  constructor(options: IIssuesProcessorOptions, state: IState) {
    this.options = options;
    this.state = state;
    this.client = getOctokit(this.options.repoToken, undefined, retry);
    this.operations = new StaleOperations(this.options);

    this._logger.info(
      LoggerService.yellow(`Starting the stale action process...`)
    );

    if (this.options.debugOnly) {
      this._logger.warning(
        LoggerService.yellowBright(`Executing in debug mode!`)
      );
      this._logger.warning(
        LoggerService.yellowBright(
          `The debug output will be written but no issues/PRs will be processed.`
        )
      );
    }

    if (this.options.enableStatistics) {
      this.statistics = new Statistics();
    }
  }

  async processIssues(page: Readonly<number> = 1): Promise<number> {
    // get the next batch of issues
    const issues: Issue[] = await this.getIssues(page);

    if (issues.length <= 0) {
      this._logger.info(
        LoggerService.green(`No more issues found to process. Exiting...`)
      );
      this.statistics
        ?.setOperationsCount(this.operations.getConsumedOperationsCount())
        .logStats();

      this.state.reset();

      return this.operations.getRemainingOperationsCount();
    } else {
      this._logger.info(
        `${LoggerService.yellow(
          'Processing the batch of issues '
        )} ${LoggerService.cyan(`#${page}`)} ${LoggerService.yellow(
          ' containing '
        )} ${LoggerService.cyan(issues.length)} ${LoggerService.yellow(
          ` issue${issues.length > 1 ? 's' : ''}...`
        )}`
      );
    }

    const labelsToRemoveWhenStale: string[] = wordsToList(
      this.options.labelsToRemoveWhenStale
    );

    const labelsToAddWhenUnstale: string[] = wordsToList(
      this.options.labelsToAddWhenUnstale
    );
    const labelsToRemoveWhenUnstale: string[] = wordsToList(
      this.options.labelsToRemoveWhenUnstale
    );

    for (const issue of issues.values()) {
      // Stop the processing if no more operations remains
      if (!this.operations.hasRemainingOperations()) {
        break;
      }

      const issueLogger: IssueLogger = new IssueLogger(issue);
      if (this.state.isIssueProcessed(issue)) {
        issueLogger.info(
          '           $$type skipped due being processed during the previous run'
        );
        continue;
      }
      await issueLogger.grouping(`$$type #${issue.number}`, async () => {
        await this.processIssue(
          issue,
          labelsToAddWhenUnstale,
          labelsToRemoveWhenUnstale,
          labelsToRemoveWhenStale
        );
      });
      this.state.addIssueToProcessed(issue);
    }

    if (!this.operations.hasRemainingOperations()) {
      this._logger.warning(
        LoggerService.yellowBright(`No more operations left! Exiting...`)
      );
      this._logger.warning(
        `${LoggerService.yellowBright(
          'If you think that not enough issues were processed you could try to increase the quantity related to the '
        )} ${this._logger.createOptionLink(
          Option.OperationsPerRun
        )} ${LoggerService.yellowBright(
          ' option which is currently set to '
        )} ${LoggerService.cyan(this.options.operationsPerRun)}`
      );
      this.statistics
        ?.setOperationsCount(this.operations.getConsumedOperationsCount())
        .logStats();

      return 0;
    }

    this._logger.info(
      `${LoggerService.green('Batch ')} ${LoggerService.cyan(
        `#${page}`
      )} ${LoggerService.green(' processed.')}`
    );

    // Do the next batch
    return this.processIssues(page + 1);
  }

  async processIssue(
    issue: Issue,
    labelsToAddWhenUnstale: Readonly<string>[],
    labelsToRemoveWhenUnstale: Readonly<string>[],
    labelsToRemoveWhenStale: Readonly<string>[]
  ): Promise<void> {
    this.statistics?.incrementProcessedItemsCount(issue);

    const issueLogger: IssueLogger = new IssueLogger(issue);
    issueLogger.info(
      `Found this $$type last updated at: ${LoggerService.cyan(
        issue.updated_at
      )}`
    );

    // calculate string based messages for this issue
    const staleMessage: string = issue.isPullRequest
      ? this.options.stalePrMessage
      : this.options.staleIssueMessage;
    const closeMessage: string = issue.isPullRequest
      ? this.options.closePrMessage
      : this.options.closeIssueMessage;
    const staleLabel: string = issue.isPullRequest
      ? this.options.stalePrLabel
      : this.options.staleIssueLabel;
    const closeLabel: string = issue.isPullRequest
      ? this.options.closePrLabel
      : this.options.closeIssueLabel;
    const skipMessage = issue.isPullRequest
      ? this.options.stalePrMessage.length === 0
      : this.options.staleIssueMessage.length === 0;
    const daysBeforeStale: number = issue.isPullRequest
      ? this._getDaysBeforePrStale()
      : this._getDaysBeforeIssueStale();

    if (issue.state === 'closed') {
      issueLogger.info(`Skipping this $$type because it is closed`);
      IssuesProcessor._endIssueProcessing(issue);
      return; // Don't process closed issues
    }

    if (issue.locked) {
      issueLogger.info(`Skipping this $$type because it is locked`);
      IssuesProcessor._endIssueProcessing(issue);
      return; // Don't process locked issues
    }

    if (this._isIncludeOnlyAssigned(issue)) {
      issueLogger.info(
        `Skipping this $$type because its assignees list is empty`
      );
      IssuesProcessor._endIssueProcessing(issue);
      return; // If the issue has an 'include-only-assigned' option set, process only issues with nonempty assignees list
    }

    const onlyLabels: string[] = wordsToList(this._getOnlyLabels(issue));

    if (onlyLabels.length > 0) {
      issueLogger.info(
        `The option ${issueLogger.createOptionLink(
          Option.OnlyLabels
        )} was specified to only process issues and pull requests with all those labels (${LoggerService.cyan(
          onlyLabels.length
        )})`
      );

      const hasAllWhitelistedLabels: boolean = onlyLabels.every(
        (label: Readonly<string>): boolean => {
          return isLabeled(issue, label);
        }
      );

      if (!hasAllWhitelistedLabels) {
        issueLogger.info(
          LoggerService.white('└──'),
          `Skipping this $$type because it doesn't have all the required labels`
        );

        IssuesProcessor._endIssueProcessing(issue);
        return; // Don't process issues without all of the required labels
      } else {
        issueLogger.info(
          LoggerService.white('├──'),
          `All the required labels are present on this $$type`
        );
        issueLogger.info(
          LoggerService.white('└──'),
          `Continuing the process for this $$type`
        );
      }
    } else {
      issueLogger.info(
        `The option ${issueLogger.createOptionLink(
          Option.OnlyLabels
        )} was not specified`
      );
      issueLogger.info(
        LoggerService.white('└──'),
        `Continuing the process for this $$type`
      );
    }

    issueLogger.info(
      `Days before $$type stale: ${LoggerService.cyan(daysBeforeStale)}`
    );

    const shouldMarkAsStale: boolean = shouldMarkWhenStale(daysBeforeStale);

    // Try to remove the close label when not close/locked issue or PR
    await this._removeCloseLabel(issue, closeLabel);

    if (this.options.startDate) {
      const startDate: Date = new Date(this.options.startDate);
      const createdAt: Date = new Date(issue.created_at);

      issueLogger.info(
        `A start date was specified for the ${getHumanizedDate(
          startDate
        )} (${LoggerService.cyan(this.options.startDate)})`
      );

      // Expecting that GitHub will always set a creation date on the issues and PRs
      // But you never know!
      if (!isValidDate(createdAt)) {
        IssuesProcessor._endIssueProcessing(issue);
        core.setFailed(
          new Error(`Invalid issue field: "created_at". Expected a valid date`)
        );
      }

      issueLogger.info(
        `$$type created the ${getHumanizedDate(
          createdAt
        )} (${LoggerService.cyan(issue.created_at)})`
      );

      if (!isDateMoreRecentThan(createdAt, startDate)) {
        issueLogger.info(
          `Skipping this $$type because it was created before the specified start date`
        );

        IssuesProcessor._endIssueProcessing(issue);
        return; // Don't process issues which were created before the start date
      }
    }

    if (issue.isStale) {
      issueLogger.info(`This $$type includes a stale label`);
    } else {
      issueLogger.info(`This $$type does not include a stale label`);
    }

    const exemptLabels: string[] = wordsToList(
      issue.isPullRequest
        ? this.options.exemptPrLabels
        : this.options.exemptIssueLabels
    );

    const hasExemptLabel = exemptLabels.some((exemptLabel: Readonly<string>) =>
      isLabeled(issue, exemptLabel)
    );

    if (hasExemptLabel) {
      issueLogger.info(
        `Skipping this $$type because it contains an exempt label, see ${issueLogger.createOptionLink(
          issue.isPullRequest ? Option.ExemptPrLabels : Option.ExemptIssueLabels
        )} for more details`
      );
      IssuesProcessor._endIssueProcessing(issue);
      return; // Don't process exempt issues
    }

    const anyOfLabels: string[] = wordsToList(this._getAnyOfLabels(issue));

    if (anyOfLabels.length > 0) {
      issueLogger.info(
        `The option ${issueLogger.createOptionLink(
          Option.AnyOfLabels
        )} was specified to only process the issues and pull requests with one of those labels (${LoggerService.cyan(
          anyOfLabels.length
        )})`
      );

      const hasOneOfWhitelistedLabels: boolean = anyOfLabels.some(
        (label: Readonly<string>): boolean => {
          return isLabeled(issue, label);
        }
      );

      if (!hasOneOfWhitelistedLabels) {
        issueLogger.info(
          LoggerService.white('└──'),
          `Skipping this $$type because it doesn't have one of the required labels`
        );
        IssuesProcessor._endIssueProcessing(issue);
        return; // Don't process issues without any of the required labels
      } else {
        issueLogger.info(
          LoggerService.white('├──'),
          `One of the required labels is present on this $$type`
        );
        issueLogger.info(
          LoggerService.white('└──'),
          `Continuing the process for this $$type`
        );
      }
    } else {
      issueLogger.info(
        `The option ${issueLogger.createOptionLink(
          Option.AnyOfLabels
        )} was not specified`
      );
      issueLogger.info(
        LoggerService.white('└──'),
        `Continuing the process for this $$type`
      );
    }

    const milestones: Milestones = new Milestones(this.options, issue);

    if (milestones.shouldExemptMilestones()) {
      IssuesProcessor._endIssueProcessing(issue);
      return; // Don't process exempt milestones
    }

    const assignees: Assignees = new Assignees(this.options, issue);

    if (assignees.shouldExemptAssignees()) {
      IssuesProcessor._endIssueProcessing(issue);
      return; // Don't process exempt assignees
    }

    // Ignore draft PR
    // Note that this check is so far below because it cost one read operation
    // So it's simply better to do all the stale checks which don't cost more operation before this one
    const exemptDraftPullRequest: ExemptDraftPullRequest =
      new ExemptDraftPullRequest(this.options, issue);

    if (
      await exemptDraftPullRequest.shouldExemptDraftPullRequest(
        async (): Promise<IPullRequest | undefined | void> => {
          return this.getPullRequest(issue);
        }
      )
    ) {
      IssuesProcessor._endIssueProcessing(issue);
      return; // Don't process draft PR
    }

    // Determine if this issue needs to be marked stale first
    if (!issue.isStale) {
      issueLogger.info(`This $$type is not stale`);

      const shouldIgnoreUpdates: boolean = new IgnoreUpdates(
        this.options,
        issue
      ).shouldIgnoreUpdates();

      // Should this issue be marked as stale?
      let shouldBeStale: boolean;

      // Ignore the last update and only use the creation date
      if (shouldIgnoreUpdates) {
        shouldBeStale = !IssuesProcessor._updatedSince(
          issue.created_at,
          daysBeforeStale
        );
      }
      // Use the last update to check if we need to stale
      else {
        shouldBeStale = !IssuesProcessor._updatedSince(
          issue.updated_at,
          daysBeforeStale
        );
      }

      if (shouldBeStale) {
        if (shouldIgnoreUpdates) {
          issueLogger.info(
            `This $$type should be stale based on the creation date the ${getHumanizedDate(
              new Date(issue.created_at)
            )} (${LoggerService.cyan(issue.created_at)})`
          );
        } else {
          issueLogger.info(
            `This $$type should be stale based on the last update date the ${getHumanizedDate(
              new Date(issue.updated_at)
            )} (${LoggerService.cyan(issue.updated_at)})`
          );
        }

        if (shouldMarkAsStale) {
          issueLogger.info(
            `This $$type should be marked as stale based on the option ${issueLogger.createOptionLink(
              this._getDaysBeforeStaleUsedOptionName(issue)
            )} (${LoggerService.cyan(daysBeforeStale)})`
          );
          await this._markStale(issue, staleMessage, staleLabel, skipMessage);
          issue.isStale = true; // This issue is now considered stale
          issue.markedStaleThisRun = true;
          issueLogger.info(`This $$type is now stale`);
        } else {
          issueLogger.info(
            `This $$type should not be marked as stale based on the option ${issueLogger.createOptionLink(
              this._getDaysBeforeStaleUsedOptionName(issue)
            )} (${LoggerService.cyan(daysBeforeStale)})`
          );
        }
      } else {
        if (shouldIgnoreUpdates) {
          issueLogger.info(
            `This $$type should not be stale based on the creation date the ${getHumanizedDate(
              new Date(issue.created_at)
            )} (${LoggerService.cyan(issue.created_at)})`
          );
        } else {
          issueLogger.info(
            `This $$type should not be stale based on the last update date the ${getHumanizedDate(
              new Date(issue.updated_at)
            )} (${LoggerService.cyan(issue.updated_at)})`
          );
        }
      }
    }

    // Process the issue if it was marked stale
    if (issue.isStale) {
      issueLogger.info(`This $$type is already stale`);
      await this._processStaleIssue(
        issue,
        staleLabel,
        staleMessage,
        labelsToAddWhenUnstale,
        labelsToRemoveWhenUnstale,
        labelsToRemoveWhenStale,
        closeMessage,
        closeLabel
      );
    }

    IssuesProcessor._endIssueProcessing(issue);
  }

  // Grab comments for an issue since a given date
  async listIssueComments(
    issue: Readonly<Issue>,
    sinceDate: Readonly<string>
  ): Promise<IComment[]> {
    // Find any comments since date on the given issue
    try {
      this._consumeIssueOperation(issue);
      this.statistics?.incrementFetchedItemsCommentsCount();
      const comments = await this.client.rest.issues.listComments({
        owner: context.repo.owner,
        repo: context.repo.repo,
        issue_number: issue.number,
        since: sinceDate
      });
      return comments.data;
    } catch (error) {
      this._logger.error(`List issue comments error: ${error.message}`);
      return Promise.resolve([]);
    }
  }

  // grab issues from github in batches of 100
  async getIssues(page: number): Promise<Issue[]> {
    try {
      this.operations.consumeOperation();
      const issueResult = await this.client.rest.issues.listForRepo({
        owner: context.repo.owner,
        repo: context.repo.repo,
        state: 'open',
        per_page: 100,
        direction: this.options.ascending ? 'asc' : 'desc',
        sort: getSortField(this.options.sortBy),
        page
      });
      this.statistics?.incrementFetchedItemsCount(issueResult.data.length);

      return issueResult.data.map(
        (issue): Issue =>
          new Issue(this.options, issue as Readonly<OctokitIssue>)
      );
    } catch (error) {
      throw Error(`Getting issues was blocked by the error: ${error.message}`);
    }
  }

  // returns the creation date of a given label on an issue (or nothing if no label existed)
  ///see https://developer.github.com/v3/activity/events/
  async getLabelCreationDate(
    issue: Issue,
    label: string
  ): Promise<string | undefined> {
    const issueLogger: IssueLogger = new IssueLogger(issue);

    issueLogger.info(`Checking for label on this $$type`);

    this._consumeIssueOperation(issue);
    this.statistics?.incrementFetchedItemsEventsCount();
    const options = this.client.rest.issues.listEvents.endpoint.merge({
      owner: context.repo.owner,
      repo: context.repo.repo,
      per_page: 100,
      issue_number: issue.number
    });

    const events: IIssueEvent[] = await this.client.paginate(options);
    const reversedEvents = events.reverse();

    const staleLabeledEvent = reversedEvents.find(
      event =>
        event.event === 'labeled' &&
        cleanLabel(event.label.name) === cleanLabel(label)
    );

    if (!staleLabeledEvent) {
      // Must be old rather than labeled
      return undefined;
    }

    return staleLabeledEvent.created_at;
  }

  async getPullRequest(issue: Issue): Promise<IPullRequest | undefined | void> {
    const issueLogger: IssueLogger = new IssueLogger(issue);

    try {
      this._consumeIssueOperation(issue);
      this.statistics?.incrementFetchedPullRequestsCount();

      const pullRequest = await this.client.rest.pulls.get({
        owner: context.repo.owner,
        repo: context.repo.repo,
        pull_number: issue.number
      });

      return pullRequest.data;
    } catch (error) {
      issueLogger.error(`Error when getting this $$type: ${error.message}`);
    }
  }

  async getRateLimit(): Promise<IRateLimit | undefined> {
    const logger: Logger = new Logger();
    try {
      const rateLimitResult = await this.client.rest.rateLimit.get();
      return new RateLimit(rateLimitResult.data.rate);
    } catch (error) {
      logger.error(`Error when getting rateLimit: ${error.message}`);
    }
  }

  // handle all of the stale issue logic when we find a stale issue
  private async _processStaleIssue(
    issue: Issue,
    staleLabel: string,
    staleMessage: string,
    labelsToAddWhenUnstale: Readonly<string>[],
    labelsToRemoveWhenUnstale: Readonly<string>[],
    labelsToRemoveWhenStale: Readonly<string>[],
    closeMessage?: string,
    closeLabel?: string
  ) {
    const issueLogger: IssueLogger = new IssueLogger(issue);
    const markedStaleOn: string =
      (await this.getLabelCreationDate(issue, staleLabel)) || issue.updated_at;
    issueLogger.info(
      `$$type marked stale on: ${LoggerService.cyan(markedStaleOn)}`
    );

    const issueHasCommentsSinceStale: boolean = await this._hasCommentsSince(
      issue,
      markedStaleOn,
      staleMessage
    );
    issueLogger.info(
      `$$type has been commented on: ${LoggerService.cyan(
        issueHasCommentsSinceStale
      )}`
    );

    const daysBeforeClose: number = issue.isPullRequest
      ? this._getDaysBeforePrClose()
      : this._getDaysBeforeIssueClose();

    issueLogger.info(
      `Days before $$type close: ${LoggerService.cyan(daysBeforeClose)}`
    );

    const shouldRemoveStaleWhenUpdated: boolean =
      this._shouldRemoveStaleWhenUpdated(issue);

    issueLogger.info(
      `The option ${issueLogger.createOptionLink(
        this._getRemoveStaleWhenUpdatedUsedOptionName(issue)
      )} is: ${LoggerService.cyan(shouldRemoveStaleWhenUpdated)}`
    );

    if (shouldRemoveStaleWhenUpdated) {
      issueLogger.info(`The stale label should not be removed`);
    } else {
      issueLogger.info(
        `The stale label should be removed if all conditions met`
      );
    }

    if (issue.markedStaleThisRun) {
      issueLogger.info(`marked stale this run, so don't check for updates`);
      await this._removeLabelsOnStatusTransition(
        issue,
        labelsToRemoveWhenStale,
        Option.LabelsToRemoveWhenStale
      );
    }

    // The issue.updated_at and markedStaleOn are not always exactly in sync (they can be off by a second or 2)
    // isDateMoreRecentThan makes sure they are not the same date within a certain tolerance (15 seconds in this case)
    const issueHasUpdateSinceStale = isDateMoreRecentThan(
      new Date(issue.updated_at),
      new Date(markedStaleOn),
      15
    );

    issueLogger.info(
      `$$type has been updated since it was marked stale: ${LoggerService.cyan(
        issueHasUpdateSinceStale
      )}`
    );

    // Should we un-stale this issue?
    if (
      shouldRemoveStaleWhenUpdated &&
      (issueHasUpdateSinceStale || issueHasCommentsSinceStale) &&
      !issue.markedStaleThisRun
    ) {
      issueLogger.info(
        `Remove the stale label since the $$type has been updated and the workflow should remove the stale label when updated`
      );
      await this._removeStaleLabel(issue, staleLabel);

      // Are there labels to remove or add when an issue is no longer stale?
      await this._removeLabelsOnStatusTransition(
        issue,
        labelsToRemoveWhenUnstale,
        Option.LabelsToRemoveWhenUnstale
      );
      await this._addLabelsWhenUnstale(issue, labelsToAddWhenUnstale);

      issueLogger.info(`Skipping the process since the $$type is now un-stale`);

      return; // Nothing to do because it is no longer stale
    }

    // Now start closing logic
    if (daysBeforeClose < 0) {
      return; // Nothing to do because we aren't closing stale issues
    }

    const issueHasUpdateInCloseWindow: boolean = IssuesProcessor._updatedSince(
      issue.updated_at,
      daysBeforeClose
    );
    issueLogger.info(
      `$$type has been updated in the last ${daysBeforeClose} days: ${LoggerService.cyan(
        issueHasUpdateInCloseWindow
      )}`
    );

    if (!issueHasCommentsSinceStale && !issueHasUpdateInCloseWindow) {
      issueLogger.info(
        `Closing $$type because it was last updated on: ${LoggerService.cyan(
          issue.updated_at
        )}`
      );
      await this._closeIssue(issue, closeMessage, closeLabel);

      if (this.options.deleteBranch && issue.pull_request) {
        issueLogger.info(
          `Deleting the branch since the option ${issueLogger.createOptionLink(
            Option.DeleteBranch
          )} is enabled`
        );
        await this._deleteBranch(issue);
        this.deletedBranchIssues.push(issue);
      }
    } else {
      issueLogger.info(
        `Stale $$type is not old enough to close yet (hasComments? ${issueHasCommentsSinceStale}, hasUpdate? ${issueHasUpdateInCloseWindow})`
      );
    }
  }

  // checks to see if a given issue is still stale (has had activity on it)
  private async _hasCommentsSince(
    issue: Issue,
    sinceDate: string,
    staleMessage: string
  ): Promise<boolean> {
    const issueLogger: IssueLogger = new IssueLogger(issue);

    issueLogger.info(
      `Checking for comments on $$type since: ${LoggerService.cyan(sinceDate)}`
    );

    if (!sinceDate) {
      return true;
    }

    // find any comments since the date
    const comments = await this.listIssueComments(issue, sinceDate);

    const filteredComments = comments.filter(
      comment =>
        comment.user?.type === 'User' &&
        comment.body?.toLowerCase() !== staleMessage.toLowerCase()
    );

    issueLogger.info(
      `Comments that are not the stale comment or another bot: ${LoggerService.cyan(
        filteredComments.length
      )}`
    );

    // if there are any user comments returned
    return filteredComments.length > 0;
  }

  // Mark an issue as stale with a comment and a label
  private async _markStale(
    issue: Issue,
    staleMessage: string,
    staleLabel: string,
    skipMessage: boolean
  ): Promise<void> {
    const issueLogger: IssueLogger = new IssueLogger(issue);

    issueLogger.info(`Marking this $$type as stale`);
    this.staleIssues.push(issue);

    // if the issue is being marked stale, the updated date should be changed to right now
    // so that close calculations work correctly
    const newUpdatedAtDate: Date = new Date();
    issue.updated_at = newUpdatedAtDate.toString();

    if (!skipMessage) {
      try {
        this._consumeIssueOperation(issue);
        this.statistics?.incrementAddedItemsComment(issue);

        if (!this.options.debugOnly) {
          await this.client.rest.issues.createComment({
            owner: context.repo.owner,
            repo: context.repo.repo,
            issue_number: issue.number,
            body: staleMessage
          });
        }
      } catch (error) {
        issueLogger.error(`Error when creating a comment: ${error.message}`);
      }
    }

    try {
      this._consumeIssueOperation(issue);
      this.statistics?.incrementAddedItemsLabel(issue);
      this.statistics?.incrementStaleItemsCount(issue);

      if (!this.options.debugOnly) {
        await this.client.rest.issues.addLabels({
          owner: context.repo.owner,
          repo: context.repo.repo,
          issue_number: issue.number,
          labels: [staleLabel]
        });
      }
    } catch (error) {
      issueLogger.error(`Error when adding a label: ${error.message}`);
    }
  }

  // Close an issue based on staleness
  private async _closeIssue(
    issue: Issue,
    closeMessage?: string,
    closeLabel?: string
  ): Promise<void> {
    const issueLogger: IssueLogger = new IssueLogger(issue);

    issueLogger.info(`Closing $$type for being stale`);
    this.closedIssues.push(issue);

    if (closeMessage) {
      try {
        this._consumeIssueOperation(issue);
        this.statistics?.incrementAddedItemsComment(issue);
        this.addedCloseCommentIssues.push(issue);

        if (!this.options.debugOnly) {
          await this.client.rest.issues.createComment({
            owner: context.repo.owner,
            repo: context.repo.repo,
            issue_number: issue.number,
            body: closeMessage
          });
        }
      } catch (error) {
        issueLogger.error(`Error when creating a comment: ${error.message}`);
      }
    }

    if (closeLabel) {
      try {
        this._consumeIssueOperation(issue);
        this.statistics?.incrementAddedItemsLabel(issue);

        if (!this.options.debugOnly) {
          await this.client.rest.issues.addLabels({
            owner: context.repo.owner,
            repo: context.repo.repo,
            issue_number: issue.number,
            labels: [closeLabel]
          });
        }
      } catch (error) {
        issueLogger.error(`Error when adding a label: ${error.message}`);
      }
    }

    try {
      this._consumeIssueOperation(issue);
      this.statistics?.incrementClosedItemsCount(issue);

      if (!this.options.debugOnly) {
        await this.client.rest.issues.update({
          owner: context.repo.owner,
          repo: context.repo.repo,
          issue_number: issue.number,
          state: 'closed',
          state_reason: this.options.closeIssueReason || undefined
        });
      }
    } catch (error) {
      issueLogger.error(`Error when updating this $$type: ${error.message}`);
    }
  }

  // Delete the branch on closed pull request
  private async _deleteBranch(issue: Issue): Promise<void> {
    const issueLogger: IssueLogger = new IssueLogger(issue);

    issueLogger.info(`Delete
    branch from closed $
    $type
    -
    ${issue.title}`);

    const pullRequest: IPullRequest | undefined | void =
      await this.getPullRequest(issue);

    if (!pullRequest) {
      issueLogger.info(
        `Not deleting this branch as no pull request was found for this $$type`
      );
      return;
    }

    const branch = pullRequest.head.ref;

    if (
      pullRequest.head.repo === null ||
      pullRequest.head.repo.full_name ===
        `${context.repo.owner}/${context.repo.repo}`
    ) {
      issueLogger.info(
        `Deleting the branch "${LoggerService.cyan(branch)}" from closed $$type`
      );

      try {
        this._consumeIssueOperation(issue);
        this.statistics?.incrementDeletedBranchesCount();

        if (!this.options.debugOnly) {
          await this.client.rest.git.deleteRef({
            owner: context.repo.owner,
            repo: context.repo.repo,
            ref: `heads/${branch}`
          });
        }
      } catch (error) {
        issueLogger.error(
          `Error when deleting the branch "${LoggerService.cyan(
            branch
          )}" from $$type: ${error.message}`
        );
      }
    } else {
      issueLogger.warning(
        `Deleting the branch "${LoggerService.cyan(
          branch
        )}" has skipped because it belongs to other repo ${
          pullRequest.head.repo.full_name
        }`
      );
    }
  }

  // Remove a label from an issue or a pull request
  private async _removeLabel(
    issue: Issue,
    label: string,
    isSubStep: Readonly<boolean> = false
  ): Promise<void> {
    const issueLogger: IssueLogger = new IssueLogger(issue);

    issueLogger.info(
      `${
        isSubStep ? LoggerService.white('├── ') : ''
      }Removing the label "${LoggerService.cyan(label)}" from this $$type...`
    );
    this.removedLabelIssues.push(issue);

    try {
      this._consumeIssueOperation(issue);
      this.statistics?.incrementDeletedItemsLabelsCount(issue);

      if (!this.options.debugOnly) {
        await this.client.rest.issues.removeLabel({
          owner: context.repo.owner,
          repo: context.repo.repo,
          issue_number: issue.number,
          name: label
        });
      }

      issueLogger.info(
        `${
          isSubStep ? LoggerService.white('└── ') : ''
        }The label "${LoggerService.cyan(label)}" was removed`
      );
    } catch (error) {
      issueLogger.error(
        `${
          isSubStep ? LoggerService.white('└── ') : ''
        }Error when removing the label: "${LoggerService.cyan(error.message)}"`
      );
    }
  }

  private _getDaysBeforeIssueStale(): number {
    return isNaN(this.options.daysBeforeIssueStale)
      ? this.options.daysBeforeStale
      : this.options.daysBeforeIssueStale;
  }

  private _getDaysBeforePrStale(): number {
    return isNaN(this.options.daysBeforePrStale)
      ? this.options.daysBeforeStale
      : this.options.daysBeforePrStale;
  }

  private _getDaysBeforeIssueClose(): number {
    return isNaN(this.options.daysBeforeIssueClose)
      ? this.options.daysBeforeClose
      : this.options.daysBeforeIssueClose;
  }

  private _getDaysBeforePrClose(): number {
    return isNaN(this.options.daysBeforePrClose)
      ? this.options.daysBeforeClose
      : this.options.daysBeforePrClose;
  }

  private _getOnlyLabels(issue: Issue): string {
    if (issue.isPullRequest) {
      if (this.options.onlyPrLabels !== '') {
        return this.options.onlyPrLabels;
      }
    } else {
      if (this.options.onlyIssueLabels !== '') {
        return this.options.onlyIssueLabels;
      }
    }

    return this.options.onlyLabels;
  }

  private _isIncludeOnlyAssigned(issue: Issue): boolean {
    return this.options.includeOnlyAssigned && !issue.hasAssignees;
  }

  private _getAnyOfLabels(issue: Issue): string {
    if (issue.isPullRequest) {
      if (this.options.anyOfPrLabels !== '') {
        return this.options.anyOfPrLabels;
      }
    } else {
      if (this.options.anyOfIssueLabels !== '') {
        return this.options.anyOfIssueLabels;
      }
    }

    return this.options.anyOfLabels;
  }

  private _shouldRemoveStaleWhenUpdated(issue: Issue): boolean {
    if (issue.isPullRequest) {
      if (isBoolean(this.options.removePrStaleWhenUpdated)) {
        return this.options.removePrStaleWhenUpdated;
      }

      return this.options.removeStaleWhenUpdated;
    }

    if (isBoolean(this.options.removeIssueStaleWhenUpdated)) {
      return this.options.removeIssueStaleWhenUpdated;
    }

    return this.options.removeStaleWhenUpdated;
  }

  private async _removeLabelsOnStatusTransition(
    issue: Issue,
    removeLabels: Readonly<string>[],
    staleStatus: Option
  ): Promise<void> {
    if (!removeLabels.length) {
      return;
    }

    const issueLogger: IssueLogger = new IssueLogger(issue);

    issueLogger.info(
      `Removing all the labels specified via the ${this._logger.createOptionLink(
        staleStatus
      )} option.`
    );

    for (const label of removeLabels.values()) {
      await this._removeLabel(issue, label);
    }
  }

  private async _addLabelsWhenUnstale(
    issue: Issue,
    labelsToAdd: Readonly<string>[]
  ): Promise<void> {
    if (!labelsToAdd.length) {
      return;
    }

    const issueLogger: IssueLogger = new IssueLogger(issue);

    issueLogger.info(
      `Adding all the labels specified via the ${this._logger.createOptionLink(
        Option.LabelsToAddWhenUnstale
      )} option.`
    );

    this.addedLabelIssues.push(issue);

    try {
      this._consumeIssueOperation(issue);
      this.statistics?.incrementAddedItemsLabel(issue);
      if (!this.options.debugOnly) {
        await this.client.rest.issues.addLabels({
          owner: context.repo.owner,
          repo: context.repo.repo,
          issue_number: issue.number,
          labels: labelsToAdd
        });
      }
    } catch (error) {
      this._logger.error(
        `Error when adding labels after updated from stale: ${error.message}`
      );
    }
  }

  private async _removeStaleLabel(
    issue: Issue,
    staleLabel: Readonly<string>
  ): Promise<void> {
    const issueLogger: IssueLogger = new IssueLogger(issue);

    issueLogger.info(
      `The $$type is no longer stale. Removing the stale label...`
    );

    await this._removeLabel(issue, staleLabel);
    this.statistics?.incrementUndoStaleItemsCount(issue);
  }

  private async _removeCloseLabel(
    issue: Issue,
    closeLabel: Readonly<string | undefined>
  ): Promise<void> {
    const issueLogger: IssueLogger = new IssueLogger(issue);

    issueLogger.info(
      `The $$type is not closed nor locked. Trying to remove the close label...`
    );

    if (!closeLabel) {
      issueLogger.info(
        LoggerService.white('├──'),
        `The ${issueLogger.createOptionLink(
          IssuesProcessor._getCloseLabelUsedOptionName(issue)
        )} option was not set`
      );
      issueLogger.info(
        LoggerService.white('└──'),
        `Skipping the removal of the close label`
      );

      return Promise.resolve();
    }

    if (isLabeled(issue, closeLabel)) {
      issueLogger.info(
        LoggerService.white('├──'),
        `The $$type has a close label "${LoggerService.cyan(
          closeLabel
        )}". Removing the close label...`
      );

      await this._removeLabel(issue, closeLabel, true);
      this.statistics?.incrementDeletedCloseItemsLabelsCount(issue);
    } else {
      issueLogger.info(
        LoggerService.white('└──'),
        `There is no close label on this $$type. Skipping`
      );

      return Promise.resolve();
    }
  }

  private _consumeIssueOperation(issue: Readonly<Issue>): void {
    this.operations.consumeOperation();
    issue.operations.consumeOperation();
  }

  private _getDaysBeforeStaleUsedOptionName(
    issue: Readonly<Issue>
  ):
    | Option.DaysBeforeStale
    | Option.DaysBeforeIssueStale
    | Option.DaysBeforePrStale {
    return issue.isPullRequest
      ? this._getDaysBeforePrStaleUsedOptionName()
      : this._getDaysBeforeIssueStaleUsedOptionName();
  }

  private _getDaysBeforeIssueStaleUsedOptionName():
    | Option.DaysBeforeStale
    | Option.DaysBeforeIssueStale {
    return isNaN(this.options.daysBeforeIssueStale)
      ? Option.DaysBeforeStale
      : Option.DaysBeforeIssueStale;
  }

  private _getDaysBeforePrStaleUsedOptionName():
    | Option.DaysBeforeStale
    | Option.DaysBeforePrStale {
    return isNaN(this.options.daysBeforePrStale)
      ? Option.DaysBeforeStale
      : Option.DaysBeforePrStale;
  }

  private _getRemoveStaleWhenUpdatedUsedOptionName(
    issue: Readonly<Issue>
  ):
    | Option.RemovePrStaleWhenUpdated
    | Option.RemoveStaleWhenUpdated
    | Option.RemoveIssueStaleWhenUpdated {
    if (issue.isPullRequest) {
      if (isBoolean(this.options.removePrStaleWhenUpdated)) {
        return Option.RemovePrStaleWhenUpdated;
      }

      return Option.RemoveStaleWhenUpdated;
    }

    if (isBoolean(this.options.removeIssueStaleWhenUpdated)) {
      return Option.RemoveIssueStaleWhenUpdated;
    }

    return Option.RemoveStaleWhenUpdated;
  }
}