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//products.json
[
    {
        "id": "1",
        "name": "Airpods Wireless Bluetooth Headphones",
        "description": "Bluetooth technology lets you connect it with compatible devices wirelessly High-quality AAC audio offers immersive listening experience Built-in microphone allows you to take calls while working",
        "price": 89.99
    },
    {
        "id": "2",
        "name": "iPhone 11 Pro 256GB Memory",
        "description": "Introducing the iPhone 11 Pro. A transformative triple-camera system that adds tons of capability without complexity. An unprecedented leap in battery life",
        "price": 599.99
    },
    {
        "id": "3",
        "name": "Cannon EOS 80D DSLR Camera",
        "description": "Characterized by versatile imaging specs, the Canon EOS 80D further clarifies itself using a pair of robust focusing systems and an intuitive design",
        "price": 929.99
    },
    {
        "id": "4",
        "name": "Sony Playstation 4 Pro White Version",
        "description": "The ultimate home entertainment center starts with PlayStation. Whether you are into gaming, HD movies, television, music",
        "price": 399.99
    },
    {
        "id": "5",
        "name": "Logitech G-Series Gaming Mouse",
        "description": "Get a better handle on your games with this Logitech LIGHTSYNC gaming mouse. The six programmable buttons allow customization for a smooth playing experience",
        "price": 49.99
    }
]


//utils.js
const fs = require('fs');

function writeDataToFile(filename, content) {
    fs.writeFileSync(filename, JSON.stringify(content), 'utf-8', (err) => {
        if (err) {
            console.log(err);
        }
    })
}

function getPostData(req) {
    return new Promise((resolve, reject) => {
        try {
            let body = "";
            req.on('data', (chunk) => {
                body += chunk.toString();
            });
            req.on('end', () => {
                resolve(body);
            })

        } catch (error) {
            reject(error);
        }
    })
}
module.exports = {
    writeDataToFile,
    getPostData
};


//productController.js
// const { writeHeapSnapshot } = require("v8");
const Product = require("./productModel");
const { getPostData } = require('./utils.js');
//Desc: Gets All Products
//Route: GET /api/products
async function getProducts(req, res) {
    try {
        const products = await Product.findAll();

        res.writeHead(200, { 'Content-Type': 'application/json' });
        res.end(JSON.stringify(products)) //array of js objs from .json file should be converted to string (in express it does auto convertion)    

    }
    catch (error) {
        console.log(error);
    }
}

//Desc: Gets Single  Products
//Route: GET /api/products/:id
async function getProduct(req, res, id) {
    try {
        const product = await Product.findById(id);

        if (!product) {
            res.writeHead(404, { 'Content-Type': 'application/json' });
            res.end(JSON.stringify({ message: "Product Not Found" }));
        }
        else {
            res.writeHead(200, { 'Content-Type': 'application/json' });
            res.end(JSON.stringify(product)) //array of js objs from .json file should be converted to string (in express it does auto convertion)    
        }
    }
    catch (error) {
        console.log(error);
    }
}

//Desc: Create a Product
//Route: POST /api/products/:id
async function createProduct(req, res) {
    try {
        // const product = {
        //     title: "Test Product",
        //     description: "This is my product",
        //     price: 100
        // }
        // res.writeHead(201, { "Content-Type": 'application/json' });
        // const newProduct = await Product.createdProduct(product);
        // return res.end(JSON.stringify(newProduct));


        // let body = "";
        // req.on('data', (chunk) => {
        //     body += chunk.toString();
        // })
        // req.on('end', async () => {
        //     const { title, description, price } = JSON.parse(body);
        //     const product = { title, description, price };
        //     const newProduct = await Product.createdProduct(product);
        //     res.writeHead(201, { "Content-Type": 'application/json' });
        //     return res.end(JSON.stringify(newProduct));
        // });


        const body = await getPostData(req);
        const { title, description, price } = JSON.parse(body);
        const product = { title, description, price };
        const newProduct = await Product.createdProduct(product);
        res.writeHead(201, { "Content-Type": 'application/json' });
        return res.end(JSON.stringify(newProduct));
    }
    catch (error) {
        console.log(error);
    }
}

//Desc: Update a Product
//Route: PUT /api/products/:id
async function updateProduct(req, res, id) {
    try {
        const product = await Product.findById(id);
        if (!product) {
            res.writeHead(404, { 'Content-Type': 'application/json' });
            res.end(JSON.stringify({ message: "Product Not Found" }));
        }
        else {
            const body = await getPostData(req);
            const { title, description, price } = JSON.parse(body);
            const productData = {
                title: title || product.title,
                description: description || product.description,
                price: price || product.price
            };
            const updProduct = await Product.update(productData);
            res.writeHead(200, { "Content-Type": 'application/json' });
            return res.end(JSON.stringify(updProduct));

        }

    }
    catch (error) {
        console.log(error);
    }
}

//Desc: Delete Products
//Route: DELETE /api/products/:id
async function deleteProduct(req, res, id) {
    try {
        const product = await Product.findById(id);

        if (!product) {
            res.writeHead(404, { 'Content-Type': 'application/json' });
            res.end(JSON.stringify({ message: "Product Not Found" }));
        }
        else {
            await Product.remove(id);
            res.writeHead(200, { 'Content-Type': 'application/json' });
            res.end(JSON.stringify({ message: `Product ${id} removed` })); //array of js objs from .json file should be converted to string (in express it does auto convertion)    
        }
    }
    catch (error) {
        console.log(error);
    }
}

module.exports = {
    getProducts,
    getProduct,
    createProduct,
    updateProduct,
    deleteProduct
};




//productModel.js
// const { create } = require('domain');
const products = require('./products.json');
const { v4: uuidv4 } = require('uuid');
const { writeDataToFile } = require('./utils.js');

function findAll() {
    return new Promise((resolve, reject) => {
        resolve(products);
    })
}

function findById(id) {
    return new Promise((resolve, reject) => {
        const product = products.find((p) => p.id === id);
        resolve(product);

    })
}

function createdProduct(product) {
    return new Promise((resolve, reject) => {
        const newProduct = { id: uuidv4(), ...product };
        products.push(newProduct);
        writeDataToFile('./products.json', products);
        resolve(newProduct);
    })
}

function update(id, product) {
    return new Promise((resolve, reject) => {
        const index = products.findIndex((p) => p.id === id);
        products[index] = { id, ...products };
        writeDataToFile('./products.json', products);
        resolve(products[index]);
    })
}

function remove(id) {
    return new Promise((resolve, reject) => {
        products = products.filter((p) => p.id !== id);
        writeDataToFile('./products.json', products);
        resolve();
    })
}

module.exports = {
    findAll,
    findById,
    createdProduct,
    update,
    remove
};



//server.js
//This code links to products.json file for Rest API without using routes from express

const http = require('http');
const { getProducts, getProduct, createProduct, updateProduct, deleteProduct } = require('./productController');
// const { createdProduct } = require('./productModel');

const port = process.env.PORT || 5000;

const server = http.createServer((req, res) => {
    // res.writeHead(200, { 'Content-Type': 'text/html' });
    // res.write("Hello");
    // res.end();   //Without url specification using conditional statements this code will execute without any error

    if (req.url === '/api/products' && req.method === "GET") {  //req.method makes the postman to execute this code when GET is present not POST, DELETE, PATCH
        getProducts(req, res);
    }
    else if (req.url.match(/\/api\/products\/([0-9]+)/) && req.method === "GET") {

        let id = req.url.split('/')[3]; //  Link: /api/products/1 =["","api","products","1"]
        getProduct(req, res, id);

    }
    else if (req.url === "/api/products" && req.method === "POST") {
        createProduct(req, res);
    }
    else if (req.url.match(/\/api\/products\/([0-9]+)/) && req.method === "PUT") {
        let id = req.url.split('/')[3]; //  Link: /api/products/1 =["","api","products","1"]
        updateProduct(req, res, id);
    } else if (req.url.match(/\/api\/products\/([0-9]+)/) && req.method === "DELETE") {
        let id = req.url.split('/')[3]; //  Link: /api/products/1 =["","api","products","1"]
        removeProduct(req, res, id);
    }
    else {
        res.writeHead(404, { 'Content-Type': 'application/json' });
        res.end(JSON.stringify({ message: "Route Not Found" }));
    }
});
server.listen(port, () => {
    console.log(`Server is running on port ${port}`);
})