const mongoose = require('mongoose');

const equitySchema = new mongoose.Schema({
  title: {
    type: String,
    required: true,
    trim: true
  },
  description: {
    type: String,
    default: ''
  },
  type: {
    type: String,
    enum: ['coupon', 'membership', 'discount', 'gift', 'other'],
    required: true
  },
  platform: {
    type: String,
    required: true,
    enum: ['taobao', 'jd', 'pdd', 'meituan', 'eleme', 'douyin', 'kuaishou', 'other']
  },
  value: {
    type: Number,
    default: 0
  },
  unit: {
    type: String,
    default: '元'
  },
  validStart: {
    type: Date,
    required: true
  },
  validEnd: {
    type: Date,
    required: true
  },
  status: {
    type: String,
    enum: ['active', 'used', 'expired', 'transferred'],
    default: 'active'
  },
  owner: {
    type: mongoose.Schema.Types.ObjectId,
    ref: 'User',
    required: true
  },
  source: {
    type: String,
    enum: ['manual', 'import', 'purchase', 'transfer'],
    default: 'manual'
  },
  images: [{
    type: String
  }],
  tags: [{
    type: String
  }],
  isTransferable: {
    type: Boolean,
    default: true
  },
  transferPrice: {
    type: Number,
    default: 0
  },
  metadata: {
    type: mongoose.Schema.Types.Mixed,
    default: {}
  }
}, {
  timestamps: true
});

equitySchema.index({ owner: 1, status: 1 });
equitySchema.index({ platform: 1, type: 1 });
equitySchema.index({ validEnd: 1 });

module.exports = mongoose.model('Equity', equitySchema);