'use strict';

const mongoose = require('mongoose'), Schema = mongoose.Schema;
const { ExportUnits, ExportJobStatus } = require('../helpers/constants');

/**
 * ExportJob model — tracks async CSV/GeoJSON export requests.
 *
 * Lifecycle: pending → processing → ready | error
 * Files are written to env.TEMP_DIR and expire after EXPORT_TTL_HOURS.
 * The download endpoint streams the file and then schedules deletion.
 */
const schema = new Schema({
  owner: { type: Schema.Types.ObjectId, ref: 'User', required: true, index: true },
  jobId: { type: Number, required: true },
  format: { type: String, enum: ['csv', 'geojson'], required: true },
  interval: { type: Number, default: null },       // GPS point thinning interval in seconds, null = all points
  units: { type: String, enum: Object.values(ExportUnits), default: ExportUnits.METRIC },  // output measurement system
  fm: { type: Boolean, default: false },           // include Flight Master / AgDisp fields when true
  status: {
    type: String,
    enum: Object.values(ExportJobStatus),
    default: ExportJobStatus.PENDING,
    index: true
  },
  filePath: { type: String },                      // absolute path on disk, set when ready
  errorMsg: { type: String },
  createdAt: { type: Date, default: Date.now, index: true },
  expiresAt: { type: Date }                        // TTL; file and record deleted after this time
});

// Auto-expire documents from MongoDB after expiresAt (background cleanup)
schema.index({ expiresAt: 1 }, { expireAfterSeconds: 0 });

module.exports = mongoose.model('ExportJob', schema);