const mongoose = require('mongoose');
const validator = require('validator');
const bcrypt = require('bcryptjs');
const jwt = require('jsonwebtoken');


const schema = new mongoose.Schema({
    name: {
        type: String,
        required: true,
        maxlength: 100,
    },
    email: {
        type: String,
        lowercase: true,
        unique: true,
        required: true,
        validate(value) {
            if (!validator.isEmail(value)) {
                throw new Error('Invalid email format');
            }
        }
    },
    password: {
        type: String,
        required: true,
        minlength: 7,
        trim: true,
    },
    tokens: [{
        token: {
            type: String,
            required: true
        }
    }]
}, {
    timestamps: true
});

schema.pre('save', async function (next) {
    const user = this;

    if (user.isModified('password')) {
        user.password = await bcrypt.hash(user.password, 8);
    }

    next();
});

schema.statics.findByCredentials = async (email, password) => {
    const user = await model.findOne({ email });

    if (!user) {
        throw new Error('Unable to login');
    }

    const isMatch = await bcrypt.compare(password, user.password);

    if (!isMatch) {
        throw new Error('Unable to login');
    }

    return user;
};

schema.methods.generateAuthToken = async function () {

    const user = this;

    const token = jwt.sign({ _id: user._id.toString() }, process.env.JWT_SECRET);

    user.tokens = user.tokens.concat({ token });

    await user.save();

    return token;
};

schema.methods.toJSON = function () {
    const user = this;
    const publicUserData = user.toObject();

    delete publicUserData.password;
    delete publicUserData.tokens;

    return publicUserData
};

const model = mongoose.model( 'Users', schema );


module.exports = { schema, model };