import { Injectable, Logger } from '@nestjs/common';
import { Cron, CronExpression } from '@nestjs/schedule';

import { JobQueue, OneDay, OnJob } from '../../base';
import { Models } from '../../models';
import { CopilotTranscriptionRetryService } from './transcript/retry';

const BACKGROUND_COPILOT_JOB_PRIORITY = 100;

declare global {
  interface Jobs {
    'copilot.session.cleanupEmptySessions': {};
    'copilot.session.generateMissingTitles': {};
  }
}

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

  constructor(
    private readonly models: Models,
    private readonly jobs: JobQueue,
    private readonly transcriptRetry: CopilotTranscriptionRetryService
  ) {}

  @Cron(CronExpression.EVERY_MINUTE)
  async reconcileTranscriptDispatches() {
    await this.transcriptRetry.reconcileDispatches();
  }

  @Cron(CronExpression.EVERY_DAY_AT_MIDNIGHT)
  async dailyCleanupJob() {
    await this.jobs.add(
      'copilot.session.cleanupEmptySessions',
      {},
      { jobId: 'daily-copilot-cleanup-empty-sessions' }
    );

    await this.jobs.add(
      'copilot.session.generateMissingTitles',
      {},
      { jobId: 'daily-copilot-generate-missing-titles' }
    );
  }

  async triggerGenerateMissingTitles() {
    await this.jobs.add(
      'copilot.session.generateMissingTitles',
      {},
      { jobId: 'trigger-copilot-generate-missing-titles' }
    );
  }

  @OnJob('copilot.session.cleanupEmptySessions')
  async cleanupEmptySessions() {
    const { removed, cleaned } =
      await this.models.copilotSession.cleanupEmptySessions(
        new Date(Date.now() - OneDay)
      );

    this.logger.log(
      `Cleanup completed: ${removed} sessions deleted, ${cleaned} sessions marked as deleted`
    );
  }

  @OnJob('copilot.session.generateMissingTitles')
  async generateMissingTitles() {
    const sessions = await this.models.copilotSession.toBeGenerateTitle();

    for (const session of sessions) {
      await this.jobs.add(
        'copilot.session.generateTitle',
        { sessionId: session.id },
        { priority: BACKGROUND_COPILOT_JOB_PRIORITY }
      );
    }
    this.logger.log(
      `Scheduled title generation for ${sessions.length} sessions`
    );
  }
}