server/src/models/Message.js

const mongoose = require('mongoose');

const messageSchema = new mongoose.Schema({
    sender: {
        type: mongoose.Schema.Types.ObjectId,
        ref: 'User',
        required: true
    },
    receiver: {
        type: mongoose.Schema.Types.ObjectId,
        ref: 'User',
        required: true
    },
    content: {
        type: String,
        required: true
    },
    bookingId: {
        type: mongoose.Schema.Types.ObjectId,
        ref: 'Booking'
    },
    isRead: {
        type: Boolean,
        default: false
    }
}, { timestamps: true });

// Index for fast retrieval of conversation history
messageSchema.index({ sender: 1, receiver: 1 });
messageSchema.index({ receiver: 1, sender: 1 });

const Message = mongoose.model('Message', messageSchema);
module.exports = Message;