const mongoose = require('mongoose');

const documentSchema = new mongoose.Schema({
  filename: {
    type: String,
    required: true
  },
  originalName: {
    type: String,
    required: true
  },
  mimeType: {
    type: String,
    required: true
  },
  size: {
    type: Number,
    required: true
  },
  url: {
    type: String,
    required: true
  },
  uploadedBy: {
    type: mongoose.Schema.Types.ObjectId,
    ref: 'User',
    required: true
  },
  accessRoles: [{
    type: String,
    enum: ['admin', 'manager', 'employee']
  }],
  accessUsers: [{
    type: mongoose.Schema.Types.ObjectId,
    ref: 'User'
  }],
  category: {
    type: String,
    enum: ['contract', 'report', 'invoice', 'presentation', 'other'],
    default: 'other'
  },
  version: {
    type: Number,
    default: 1
  },
  description: {
    type: String,
    trim: true
  },
  tags: [{
    type: String,
    trim: true
  }],
  isPublic: {
    type: Boolean,
    default: false
  }
}, {
  timestamps: true
});

documentSchema.index({ uploadedBy: 1 });
documentSchema.index({ category: 1 });

module.exports = mongoose.model('Document', documentSchema);