import {
  Controller,
  Get,
  Post,
  Param,
  Body,
  Logger,
  NotFoundException,
} from '@nestjs/common';
import { ApiTags, ApiOperation, ApiBearerAuth } from '@nestjs/swagger';
import { InjectQueue } from '@nestjs/bullmq';
import { Queue } from 'bullmq';
import {
  QUEUES,
  JobType,
  JobStatus,
} from '../queue/queue.constants';

/**
 * JobsController
 *
 * REST API for managing async AI jobs.
 *
 * Endpoints:
 * - POST /jobs/submit           — Submit a new async job
 * - GET  /jobs/:id/status       — Check job status & progress
 * - GET  /jobs/:id/result       — Get job result
 *
 * TR: Asenkron AI işlerini yönetmek için REST API.
 */
@ApiTags('SkriptAI - Jobs')
@ApiBearerAuth()
@Controller('skriptai/jobs')
export class JobsController {
  private readonly logger = new Logger(JobsController.name);

  constructor(
    @InjectQueue(QUEUES.SCRIPT_GENERATION)
    private readonly scriptQueue: Queue,
    @InjectQueue(QUEUES.DEEP_RESEARCH)
    private readonly researchQueue: Queue,
    @InjectQueue(QUEUES.ANALYSIS)
    private readonly analysisQueue: Queue,
    @InjectQueue(QUEUES.IMAGE_GENERATION)
    private readonly imageQueue: Queue,
  ) {}

  /**
   * Submit a new async job
   */
  @Post('submit')
  @ApiOperation({ summary: 'Submit an async AI job' })
  async submitJob(
    @Body()
    body: {
      type: JobType;
      payload: Record<string, any>;
    },
  ) {
    const { type, payload } = body;
    const queue = this.getQueueForJobType(type);

    const job = await queue.add(type, payload, {
      attempts: 2,
      backoff: { type: 'exponential', delay: 5000 },
      removeOnComplete: { age: 3600 }, // 1 hour
      removeOnFail: { age: 86400 }, // 24 hours
    });

    this.logger.log(
      `Job submitted: ${job.id} (${type}) — payload: ${JSON.stringify(payload)}`,
    );

    return {
      jobId: job.id,
      type,
      status: JobStatus.QUEUED,
    };
  }

  /**
   * Check job status and progress
   */
  @Get(':id/status')
  @ApiOperation({ summary: 'Check job status & progress' })
  async getJobStatus(@Param('id') jobId: string) {
    const job = await this.findJobById(jobId);

    if (!job) {
      throw new NotFoundException(`Job ${jobId} not found`);
    }

    const state = await job.getState();
    const progress = job.progress;

    return {
      jobId: job.id,
      type: job.name,
      status: this.mapBullState(state),
      progress: progress || null,
      createdAt: new Date(job.timestamp).toISOString(),
      processedOn: job.processedOn
        ? new Date(job.processedOn).toISOString()
        : null,
      finishedOn: job.finishedOn
        ? new Date(job.finishedOn).toISOString()
        : null,
      failedReason: job.failedReason || null,
    };
  }

  /**
   * Get job result
   */
  @Get(':id/result')
  @ApiOperation({ summary: 'Get completed job result' })
  async getJobResult(@Param('id') jobId: string) {
    const job = await this.findJobById(jobId);

    if (!job) {
      throw new NotFoundException(`Job ${jobId} not found`);
    }

    const state = await job.getState();

    if (state !== 'completed') {
      return {
        jobId: job.id,
        status: this.mapBullState(state),
        result: null,
        message: 'Job has not completed yet',
      };
    }

    return {
      jobId: job.id,
      status: JobStatus.COMPLETED,
      result: job.returnvalue,
    };
  }

  // ========== HELPERS ==========

  private getQueueForJobType(type: JobType): Queue {
    if (
      type === JobType.GENERATE_SCRIPT ||
      type === JobType.REGENERATE_SEGMENT ||
      type === JobType.REGENERATE_PARTIAL ||
      type === JobType.REWRITE_SEGMENT
    ) {
      return this.scriptQueue;
    }

    if (
      type === JobType.DEEP_RESEARCH ||
      type === JobType.DISCOVER_QUESTIONS
    ) {
      return this.researchQueue;
    }

    if (
      type === JobType.NEURO_ANALYSIS ||
      type === JobType.YOUTUBE_AUDIT ||
      type === JobType.COMMERCIAL_BRIEF ||
      type === JobType.GENERATE_VISUAL_ASSETS
    ) {
      return this.analysisQueue;
    }

    if (
      type === JobType.GENERATE_SEGMENT_IMAGE ||
      type === JobType.GENERATE_THUMBNAIL
    ) {
      return this.imageQueue;
    }

    throw new Error(`Unknown job type: ${type}`);
  }

  private async findJobById(jobId: string) {
    const queues = [
      this.scriptQueue,
      this.researchQueue,
      this.analysisQueue,
      this.imageQueue,
    ];

    for (const queue of queues) {
      const job = await queue.getJob(jobId);
      if (job) return job;
    }

    return null;
  }

  private mapBullState(state: string): JobStatus {
    switch (state) {
      case 'completed':
        return JobStatus.COMPLETED;
      case 'failed':
        return JobStatus.FAILED;
      case 'active':
        return JobStatus.PROCESSING;
      default:
        return JobStatus.QUEUED;
    }
  }
}