const mongoose = require('mongoose');
const { Schema } = mongoose;

const userSchema = new Schema({
    unique_id: {
        type: Number,
        required: true,
        unique: true
    },
    email: {
        type: String,
        unique: true,
        sparse: true,  // Indexing only if present
        // validate: {
        //     validator: function (value) {
        //         // Validate only if the email field is updated
        //         if (this.isModified('email') && value) {
        //             return !this.mobileNumber;
        //         }
        //         return true;
        //     },
        //     message: 'Mobile number must be empty if email is provided.'
        // }
    },
    username: {
        type: String,
        required: true
    },
    dateOfBirth: {
        type: String
    },
    mobileNumber: {
        type: String,
        unique: true,
        sparse: true,  // Indexing only if present
        // validate: {
        //     validator: function (value) {
        //         // Validate only if the mobileNumber field is updated
        //         if (this.isModified('mobileNumber') && value) {
        //             return !this.email;
        //         }
        //         return true;
        //     },
        //     message: 'Email must be empty if mobile number is provided.'
        // }
    },
    password: {
        type: String,
        required: true
    },
    pushToken: {
        type: String
    },
    token: {
        type: String
    },
    role: {
        type: String,
        enum: ['user', 'admin', 'customer'],
        default: 'user'
    },
    googleId: {
        type: String
    },
    profilePic: {
        type: String
    },
    addresses: [{
        name: {
            type: String,
            required: true
        },
        mobileNumber: {
            type: String,
            required: true
        },
        pinCode: {
            type: String,
            required: true
        },
        address: {
            type: String,
            required: true
        },
        area: {
            type: String,
            required: true
        },
        landMark: {
            type: String
        },
        alterMobileNumber: {
            type: String
        },
        _id: {  // Add if you want unique IDs for addresses
            type: mongoose.Schema.Types.ObjectId,
            auto: true
        }
    }]
}, {
    timestamps: true // This adds `createdAt` and `updatedAt` fields
});

// Pre-update hook to ensure validation happens only when email or mobileNumber are updated
// userSchema.pre('findOneAndUpdate', function (next) {
//     const update = this.getUpdate();
//     const user = this._conditions;

//     // Check if email and mobileNumber are both in the update query
//     if (update.email && update.mobileNumber) {
//         const error = new Error('Email and mobile number cannot both be provided.');
//         return next(error);  // Return error if both fields are set
//     }

//     // Proceed with the update
//     next();
// });

const User = mongoose.model('User', userSchema);

module.exports = User;