const mongoose = require("mongoose");

const CommentSchema = new mongoose.Schema(
  {
    user: {
      type: mongoose.Schema.Types.ObjectId,
      ref: "User",
      required: true,
      index: true,
    },
    post: {
      type: mongoose.Schema.Types.ObjectId,
      ref: "Post",
      required: true,
      index: true,
    },
    content: {
      type: String,
      required: true,
      trim: true,
      maxlength: 500,
    },
  },
  {
    timestamps: true,
  },
);

// Compound index for efficient querying of comments by post
CommentSchema.index({ post: 1, createdAt: -1 });

module.exports = mongoose.model("Comment", CommentSchema);