const mongoose = require('mongoose');

const userSelectionSchema = new mongoose.Schema({
  userId: {
    type: mongoose.Schema.Types.ObjectId,
    ref: 'User',
    required: true
  },
  selectedRecipes: [{
    recipeId: {
      type: mongoose.Schema.Types.ObjectId,
      ref: 'Recipe',
      required: true
    },
    quantity: {
      type: Number,
      default: 1,
      min: 1
    },
    addedAt: {
      type: Date,
      default: Date.now
    }
  }],
  aggregatedIngredients: [{
    name: String,
    totalAmount: Number,
    unit: String,
    recipes: [{
      recipeId: {
        type: mongoose.Schema.Types.ObjectId,
        ref: 'Recipe'
      },
      recipeTitle: String,
      amount: Number,
      quantity: Number // recipe quantity multiplier
    }]
  }],
  createdAt: {
    type: Date,
    default: Date.now
  },
  updatedAt: {
    type: Date,
    default: Date.now
  }
});

// Update the updatedAt field before saving
userSelectionSchema.pre('save', function(next) {
  this.updatedAt = Date.now();
  next();
});

module.exports = mongoose.model('UserSelection', userSelectionSchema);