const mongoose = require('mongoose');
const Schema = mongoose.Schema;

const PostSchema = new Schema({
  title: { 
    type: String, 
    required: true,
    default: '无标题'
  },
  content: { 
    type: String, 
    required: true,
    default: ''
  },
  author: { 
    type: String, 
    required: true,
    default: '未知作者'
  },
  category: { 
    type: String, 
    required: true,
    default: '未分类'
  },
  isPublished: {
    type: Boolean,
    default: true
  },
  isTop: {
    type: Boolean,
    default: false
  },
  createdAt: { 
    type: Date, 
    default: Date.now 
  },
  updatedAt: { 
    type: Date, 
    default: Date.now 
  }
});

// 更新时自动设置updatedAt
PostSchema.pre('save', function(next) {
  this.updatedAt = new Date();
  next();
});

module.exports = mongoose.model('Post', PostSchema);