'use strict';

/**
 * Integration tests – api_export controller (controllers/api_export.js)
 *
 * Note: generateExport (async file-writing) runs via setImmediate — we do not wait for
 * it in these tests. triggerExport returns status='pending' immediately and that is what
 * we assert against. downloadExport requires a ready file path and is excluded here.
 */

const { connectDB, disconnectDB, clearCollection } = require('./jest.setup');
const { mockApplicator, mockClient, mockJob, mockReq, mockRes } = require('./mock_data');

let Job, ExportJob, Customer, Client;

beforeAll(async () => {
  await connectDB();
  ({ Job } = require('../../model'));
  ExportJob  = require('../../model/export_job');
  Customer   = require('../../model/customer');
  Client     = require('../../model/client');
});

afterAll(async () => {
  // Flush pending setImmediate callbacks (e.g. generateExport) before disconnecting
  await new Promise(resolve => setImmediate(resolve));
  await disconnectDB();
});

const apiExportCtl = require('../../controllers/api_export');

let _nextJobId = 800001;
function nextJobId() { return _nextJobId++; }

describe('api_export controller', () => {
  let applicator, client, jobRecord;

  beforeAll(async () => {
    await clearCollection(Job);
    await clearCollection(ExportJob);

    applicator = await Customer.create(mockApplicator());
    client     = await Client.create(mockClient(applicator._id));

    const jobId = nextJobId();
    jobRecord = await Job.create(
      mockJob(applicator._id, { _id: jobId, client: client._id })
    );
  });

  afterAll(async () => {
    await clearCollection(Job);
    await clearCollection(ExportJob);
    await Customer.deleteMany({ _id: { $in: [applicator._id, client._id] } });
  });

  const makeReq = (extra = {}) =>
    mockReq({ uid: applicator._id, puid: applicator._id, ut: '1', ...extra });

  // -------------------------------------------------------------------------
  describe('triggerExport', () => {
    it('throws when jobId param is not a finite number', async () => {
      const req = makeReq({
        params: { jobId: 'nan' },
        body: { format: 'csv' },
      });
      const res = mockRes();
      await expect(apiExportCtl.triggerExport(req, res)).rejects.toThrow();
    });

    it('throws JOB_NOT_FOUND when job does not exist', async () => {
      const req = makeReq({
        params: { jobId: '999999' },
        body: { format: 'csv' },
      });
      const res = mockRes();
      await expect(apiExportCtl.triggerExport(req, res)).rejects.toThrow();
    });

    it('throws AppAuthError when uid does not own the job', async () => {
      const other = await Customer.create(mockApplicator());
      const req = mockReq({
        uid: other._id,
        puid: other._id,
        params: { jobId: String(jobRecord._id) },
        body: { format: 'csv' },
      });
      const res = mockRes();
      await expect(apiExportCtl.triggerExport(req, res)).rejects.toThrow();
      await Customer.deleteMany({ _id: other._id });
    });

    it('returns 400 when format is invalid', async () => {
      const req = makeReq({
        params: { jobId: String(jobRecord._id) },
        body: { format: 'xlsx' },
      });
      const res = mockRes();

      await apiExportCtl.triggerExport(req, res);

      expect(res.status).toHaveBeenCalledWith(400);
    });

    it('creates a pending ExportJob and returns exportId + status=pending for csv', async () => {
      await ExportJob.deleteMany({});

      const req = makeReq({
        params: { jobId: String(jobRecord._id) },
        body: { format: 'csv' },
      });
      const res = mockRes();

      await apiExportCtl.triggerExport(req, res);

      expect(res.statusCode).toBe(202);
      expect(res._data.status).toBe('pending');
      expect(res._data.exportId).toBeDefined();
      expect(res._data.format).toBe('csv');

      const saved = await ExportJob.findById(res._data.exportId);
      expect(saved).not.toBeNull();
      expect(saved.jobId).toBe(jobRecord._id);
    });

    it('creates a pending ExportJob for geojson format', async () => {
      await ExportJob.deleteMany({});

      const req = makeReq({
        params: { jobId: String(jobRecord._id) },
        body: { format: 'geojson' },
      });
      const res = mockRes();

      await apiExportCtl.triggerExport(req, res);

      expect(res.statusCode).toBe(202);
      expect(res._data.format).toBe('geojson');
    });

    it('deduplicates: returns existing pending export on second identical request', async () => {
      await ExportJob.deleteMany({});

      const reqBody = { format: 'csv', units: 'metric' };

      const req1 = makeReq({ params: { jobId: String(jobRecord._id) }, body: reqBody });
      const res1 = mockRes();
      await apiExportCtl.triggerExport(req1, res1);
      const firstExportId = String(res1._data.exportId);

      // Second identical request within dedup window
      const req2 = makeReq({ params: { jobId: String(jobRecord._id) }, body: reqBody });
      const res2 = mockRes();
      await apiExportCtl.triggerExport(req2, res2);

      expect(res2._data.reused).toBe(true);
      expect(String(res2._data.exportId)).toBe(firstExportId);
    });

    it('deduplicates: different format creates a new export', async () => {
      await ExportJob.deleteMany({});

      const req1 = makeReq({
        params: { jobId: String(jobRecord._id) },
        body: { format: 'csv' },
      });
      const res1 = mockRes();
      await apiExportCtl.triggerExport(req1, res1);

      const req2 = makeReq({
        params: { jobId: String(jobRecord._id) },
        body: { format: 'geojson' },
      });
      const res2 = mockRes();
      await apiExportCtl.triggerExport(req2, res2);

      expect(res2._data.reused).toBeUndefined();
      expect(String(res2._data.exportId)).not.toBe(String(res1._data.exportId));
    });
  });

  // -------------------------------------------------------------------------
  describe('getExportStatus', () => {
    it('throws when exportId is not a valid ObjectId', async () => {
      const req = makeReq({ params: { exportId: 'not-an-id' } });
      const res = mockRes();
      await expect(apiExportCtl.getExportStatus(req, res)).rejects.toThrow();
    });

    it('returns 404 when exportId does not exist', async () => {
      const mongoose = require('mongoose');
      const req = makeReq({
        params: { exportId: new mongoose.Types.ObjectId().toHexString() },
      });
      const res = mockRes();
      await apiExportCtl.getExportStatus(req, res);
      expect(res.statusCode).toBe(404);
    });

    it('returns the export status for a valid exportId owned by the user', async () => {
      const req = makeReq({
        params: { jobId: String(jobRecord._id) },
        body: { format: 'csv' },
      });
      const createRes = mockRes();
      await apiExportCtl.triggerExport(req, createRes);
      const exportId = String(createRes._data.exportId);

      const statusReq = makeReq({ params: { exportId } });
      const statusRes = mockRes();

      await apiExportCtl.getExportStatus(statusReq, statusRes);

      expect(statusRes.json).toHaveBeenCalled();
      expect(statusRes._data.status).toBeDefined();
      expect(String(statusRes._data.exportId)).toBe(exportId);
    });

    it('returns 404 when export belongs to a different user', async () => {
      const mongoose = require('mongoose');
      const { ObjectId } = require('mongodb');

      // Create an ExportJob owned by someone else
      const otherOwnerId = new mongoose.Types.ObjectId();
      const job = await ExportJob.create({
        owner: ObjectId(otherOwnerId.toHexString()),
        jobId: jobRecord._id,
        format: 'csv',
        units: 'metric',
        fm: false,
        status: 'pending',
      });

      const req = makeReq({ params: { exportId: String(job._id) } });
      const res = mockRes();
      await apiExportCtl.getExportStatus(req, res);
      expect(res.statusCode).toBe(404);
    });
  });
});