import mongoose from "mongoose";

const MessageSchema = new mongoose.Schema({
  sender: {
    type: String,
    enum: ["buyer", "vendor"],
    required: true
  },
  buyerId: {
    type: String,
    required: true
  },
  vendorId: {
    type: mongoose.Schema.Types.ObjectId,
    ref: "Vendor",
    required: true
  },
  content: {
    type: String,
    required: true
  },
  attachments: [{
    type: String,
    required: false
  }],
  read: {
    type: Boolean,
    default: false
  },
  createdAt: {
    type: Date,
    default: Date.now
  }
});

const ChatSchema = new mongoose.Schema({
  buyerId: {
    type: String,
    required: true
  },
  vendorId: {
    type: mongoose.Schema.Types.ObjectId,
    ref: "Vendor",
    required: true
  },
  storeId: {
    type: mongoose.Schema.Types.ObjectId,
    ref: "Store",
    required: true
  },
  messages: [MessageSchema],
  orderId: {
    type: mongoose.Schema.Types.ObjectId,
    ref: "Order",
    required: false
  },
  lastUpdated: {
    type: Date,
    default: Date.now
  }
});

// Create indexes for faster queries
ChatSchema.index({ buyerId: 1, vendorId: 1 });
ChatSchema.index({ vendorId: 1, lastUpdated: -1 });
ChatSchema.index({ buyerId: 1, lastUpdated: -1 });

export default mongoose.model("Chat", ChatSchema);