const mongoose = require('mongoose');

const weeklyPracticeFileSchema = new mongoose.Schema({
  type: {
    type: String,
    enum: ['source', 'translation'],
    required: true
  },
  weekNumber: {
    type: Number,
    required: true,
    index: true
  },
  // Optional link to a specific source file when type === 'translation'
  sourceFileId: {
    type: mongoose.Schema.Types.ObjectId,
    ref: 'WeeklyPracticeFile'
  },
  // Uploader info (required for translations, optional for source uploads)
  userId: {
    type: String
  },
  username: {
    type: String
  },
  fileName: {
    type: String,
    required: true
  },
  mimeType: {
    type: String,
    required: true
  },
  size: {
    type: Number,
    required: true
  },
  // Store the file contents in MongoDB as a Buffer
  data: {
    type: Buffer,
    required: true
  },
  description: {
    type: String
  }
}, { timestamps: true });

module.exports = mongoose.model('WeeklyPracticeFile', weeklyPracticeFileSchema);