const express = require('express');
const router = express.Router();
const sql = require('mssql');
const moment = require('moment');
const { getUser } = require('../util.js');

router.get('/', async function(req, res, next) {
    res.setHeader('Content-Type', 'text/html');

    /** Make connection and validate **/
    let pool = false;
    let customerRequest = false;
    let orderStatement = false;
    let orderProductStatement = false;

    let content;

    loadedResources: try {
        let productList = false;
        if (req.session.productList && req.session.productList.length > 0) {
            productList = req.session.productList.filter(p => p != null);
        }


        /**
        Determine if valid customer id was entered
        Determine if there are products in the shopping cart
        If either are not true, display an error message
        **/

        if (!productList) {
            content = `
                <p>
                    You do not currently have any items in your cart.
                </p>
            `;

            break loadedResources;
        }

        if (!/^-?\d+$/.test(req.query.customerId)) {
            content = `
                <p>
                    The given ID does not match any known customer.
                </p>
            `;

            break loadedResources;
        }


        pool = await sql.connect(dbConfig);
        customerRequest = new sql.PreparedStatement(pool);
        customerRequest.input('id', sql.Int);
        await customerRequest.prepare(`
            select customerId, password from customer where customerId = @id
        `);
        const customerResults = await customerRequest.execute({id: req.query.customerId});

        if (customerResults.recordset.length == 0) {
            content = `
                <p>
                    The given ID does not match any known customer.
                </p>
            `;

            break loadedResources;
        }

        const customer = customerResults.recordset[0];

        if (customer.password != req.query.password) {
            content = `
                <p>
                    Id or password did not match!
                </p>
            `;

            break loadedResources;
        }

        /** Save order information to database**/
        /**
        // Use retrieval of auto-generated keys.
        sqlQuery = "INSERT INTO <TABLE> OUTPUT INSERTED.orderId VALUES( ... )";
        let result = await pool.request()
            .input(...)
            .query(sqlQuery);
        // Catch errors generated by the query
        let orderId = result.recordset[0].orderId;
        **/

        console.log(productList)
        const totalAmount = productList.reduce((acc, next) => acc + next.price * next.quantity, 0);

        orderStatement = new sql.PreparedStatement(pool);
        orderStatement.input('amount', sql.Decimal(10, 2));
        orderStatement.input('address', sql.VarChar);
        orderStatement.input('city', sql.VarChar);
        orderStatement.input('state', sql.VarChar);
        orderStatement.input('country', sql.VarChar);
        orderStatement.input('postalCode', sql.VarChar);
        orderStatement.input('customerId', sql.Int);
        await orderStatement.prepare(`
            insert into ordersummary(orderDate, totalAmount, shipToAddress, shipToCity, shipToState, shipToPostalCode, shipToCountry, customerId)
            output inserted.orderId
            values (getdate(), @amount, @address, @city, @state, @postalCode, @country, @customerId)
        `);
        const orderResults = await orderStatement.execute({
            amount: totalAmount,
            address: customer.address,
            city: customer.city,
            state: customer.state,
            country: customer.country,
            postalCode: customer.postalCode,
            customerId: customer.customerId,
        });

        const orderId = orderResults.recordset[0].orderId;

        /** Insert each item into OrderedProduct table using OrderId from previous INSERT **/
        /** Update total amount for order record **/
        /** For each entry in the productList is an array with key values: id, name, quantity, price **/

        orderProductStatement = new sql.PreparedStatement(pool);
        orderProductStatement.input('orderId', sql.Int);
        orderProductStatement.input('id', sql.Int);
        orderProductStatement.input('quantity', sql.Int);
        orderProductStatement.input('price', sql.Decimal(10, 2));
        await orderProductStatement.prepare(`
            insert into orderproduct(orderId, productId, quantity, price) values (@orderId, @id, @quantity, @price)
        `);

        await Promise.all(productList.map(product =>
            orderProductStatement.execute({
                ...product,
                orderId
            })
        ));

        content = `
            <table>
                <tbody>
                    <tr>
                        <th>Product Name</th>
                        <th>Price</th>
                        <th>Quantity</th>
                    </tr>
                    ${productList.map(row => `
                        <tr>
                            <td>${row.name}</td>
                            <td>$${Number(row.price).toFixed(2)}</td>
                            <td>${row.quantity}</td>
                        </tr>
                    `).join('\n')}
                </tbody>
            </table>
            <p>
                <strong>Order Total:</strong> $${Number(totalAmount).toFixed(2)}
            </p>
            <p>
                <strong>Tracking Number:</strong> ${orderId}
            </p>
        `;
    } catch (err) {
        console.error(err);
        content = `
            <p>
                ${err.toString()}
            </p>
        `;
    } finally {
        if (customerRequest) customerRequest.unprepare();
        if (orderStatement) orderStatement.unprepare();
        if (orderProductStatement) orderProductStatement.unprepare();
        if (pool) pool.close();
    }

    /** Print out order summary **/

    /** Clear session/cart **/
    req.session.productList = [];

    res.render('layouts/main', {
        title: 'Order Complete',
        loggedIn: true,
        user: getUser(req),
        spacer: true,
        content: `
        <h1>Your Order</h1>
        ${content}
        `,
    });
});

module.exports = router;