/**
 * Copyright (c) 2026 Niolla
 * All rights reserved.
 *
 * This source code is proprietary and confidential.
 * Unauthorized copying, modification, distribution, or use
 * of this file, via any medium, is strictly prohibited.
 */

// app/utils/documentJob.util.js

const documentQueue  = require("../queues/document.queue");

/**
 * Queue a document generation job
 * @param {string} document - Document type (e.g., 'precost')
 * @param {string} documentType - Format (e.g., 'pdf', 'excel')
 * @param {object} data - Data to pass to document generator
 * @returns {Promise<object>} Job object with id
 */
const queueDocumentJob = async (document, documentType, data) => {
  try {
    const job = await documentQueue .add("generate-document", {
      document,
      documentType,
      data,
    });

    return {
      success: true,
      jobId: job.id,
      createdAt: new Date(),
    };
  } catch (error) {
    throw new Error(`Failed to queue document job: ${error.message}`);
  }
};

/**
 * Get job status
 * @param {string|number} jobId - Job ID
 * @returns {Promise<object>} Job status and details
 */
const getDocumentJobStatus = async (jobId) => {
  try {
    const job = await documentQueue .getJob(jobId);

    if (!job) {
      return {
        success: false,
        message: "Job not found",
      };
    }

    const state = await job.getState();
    const result = job.returnvalue;

    return {
      success: true,
      jobId: job.id,
      state,
      result: state === "completed" ? result : null,
      error: state === "failed" ? job.failedReason : null,
      createdAt: new Date(job.timestamp),
      startedAt: job.processedOn ? new Date(job.processedOn) : null,
      completedAt: job.finishedOn ? new Date(job.finishedOn) : null,
    };
  } catch (error) {
    throw new Error(`Failed to get job status: ${error.message}`);
  }
};

/**
 * Wait for job completion with timeout
 * @param {string|number} jobId - Job ID
 * @param {number} timeout - Timeout in milliseconds (default: 300000 = 5 minutes)
 * @returns {Promise<object>} Job result when completed
 */
const waitForDocumentJob = async (jobId, timeout = 300000) => {
  try {
    const job = await documentQueue .getJob(jobId);

    if (!job) {
      throw new Error("Job not found");
    }

    return await job.waitUntilFinished(
      { timeout },
      documentQueue .events
    );
  } catch (error) {
    throw new Error(`Failed to wait for job: ${error.message}`);
  }
};

/**
 * Remove a job from queue
 * @param {string|number} jobId - Job ID
 * @returns {Promise<boolean>} Success status
 */
const cancelDocumentJob = async (jobId) => {
  try {
    const job = await documentQueue .getJob(jobId);

    if (!job) {
      throw new Error("Job not found");
    }

    await job.remove();
    return true;
  } catch (error) {
    throw new Error(`Failed to cancel job: ${error.message}`);
  }
};

/**
 * Get all active jobs
 * @returns {Promise<array>} Array of active job details
 */
const getActiveJobs = async () => {
  try {
    const jobs = await documentQueue .getActiveCount();
    const activeJobs = await documentQueue .getJobs(["active"], 0, -1);

    return {
      count: jobs,
      jobs: activeJobs.map((job) => ({
        id: job.id,
        data: job.data,
        state: "active",
        progress: job.progress(),
      })),
    };
  } catch (error) {
    throw new Error(`Failed to get active jobs: ${error.message}`);
  }
};

/**
 * Get all pending jobs
 * @returns {Promise<array>} Array of pending job details
 */
const getPendingJobs = async () => {
  try {
    const jobs = await documentQueue .getWaitingCount();
    const pendingJobs = await documentQueue .getJobs(["waiting"], 0, -1);

    return {
      count: jobs,
      jobs: pendingJobs.map((job) => ({
        id: job.id,
        data: job.data,
        state: "waiting",
      })),
    };
  } catch (error) {
    throw new Error(`Failed to get pending jobs: ${error.message}`);
  }
};

module.exports = {
  queueDocumentJob,
  getDocumentJobStatus,
  waitForDocumentJob,
  cancelDocumentJob,
  getActiveJobs,
  getPendingJobs,
};