mirror of
https://github.com/Mueller-Patrick/Betterzon.git
synced 2024-11-13 01:53:57 +00:00
BETTERZON-73: Adding API endpoint that returns the lowest non-amazon prices for a given list of product ids (#32)
This commit is contained in:
parent
9e9b442f35
commit
f7c045b5a3
|
@ -82,6 +82,25 @@ pricesRouter.get('/bestDeals/:amount', async (req: Request, res: Response) => {
|
|||
}
|
||||
});
|
||||
|
||||
// GET prices/byProduct/list/[]
|
||||
|
||||
pricesRouter.get('/byProduct/list/:ids', async (req: Request, res: Response) => {
|
||||
const productIds: [number] = JSON.parse(req.params.ids);
|
||||
|
||||
if (!productIds) {
|
||||
res.status(400).send('Missing parameters.');
|
||||
return;
|
||||
}
|
||||
|
||||
try {
|
||||
const prices: Prices = await PriceService.findListByProducts(productIds);
|
||||
|
||||
res.status(200).send(prices);
|
||||
} catch (e) {
|
||||
res.status(404).send(e.message);
|
||||
}
|
||||
});
|
||||
|
||||
// POST items/
|
||||
|
||||
// pricesRouter.post('/', async (req: Request, res: Response) => {
|
||||
|
|
|
@ -195,7 +195,6 @@ export const getBestDeals = async (amount: number): Promise<Prices> => {
|
|||
let allPrices: Record<number, Price[]> = {};
|
||||
|
||||
// Get newest prices for every product at every vendor
|
||||
|
||||
const rows = await conn.query(
|
||||
'WITH summary AS (\n' +
|
||||
' SELECT p.product_id,\n' +
|
||||
|
@ -222,10 +221,11 @@ export const getBestDeals = async (amount: number): Promise<Prices> => {
|
|||
}
|
||||
|
||||
// Iterate over all prices to find the products with the biggest difference between amazon and other vendor
|
||||
let deals = [];
|
||||
for (let productId in Object.keys(allPrices)) {
|
||||
if (allPrices[productId]) {
|
||||
let pricesForProd = allPrices[productId];
|
||||
let deals: Price[] = [];
|
||||
|
||||
Object.keys(allPrices).forEach(productId => {
|
||||
if (allPrices[parseInt(productId)]) {
|
||||
let pricesForProd = allPrices[parseInt(productId)];
|
||||
|
||||
// Get amazon price and lowest price from other vendor
|
||||
let amazonPrice = {} as Price;
|
||||
|
@ -234,6 +234,7 @@ export const getBestDeals = async (amount: number): Promise<Prices> => {
|
|||
if (price.vendor_id === 1) {
|
||||
amazonPrice = price;
|
||||
} else {
|
||||
// If there is no lowest price yet or the price of the current iteration is lower, set / replace it
|
||||
if (!lowestPrice.price_in_cents || lowestPrice.price_in_cents > price.price_in_cents) {
|
||||
lowestPrice = price;
|
||||
}
|
||||
|
@ -245,25 +246,25 @@ export const getBestDeals = async (amount: number): Promise<Prices> => {
|
|||
'product_id': lowestPrice.product_id,
|
||||
'vendor_id': lowestPrice.vendor_id,
|
||||
'price_in_cents': lowestPrice.price_in_cents,
|
||||
'timestamp' :lowestPrice.timestamp,
|
||||
'timestamp': lowestPrice.timestamp,
|
||||
'amazonDifference': (amazonPrice.price_in_cents - lowestPrice.price_in_cents),
|
||||
'amazonDifferencePercent': ((1 - (lowestPrice.price_in_cents / amazonPrice.price_in_cents)) * 100),
|
||||
};
|
||||
|
||||
// Push only deals were the amazon price is actually higher
|
||||
if(deal.amazonDifferencePercent > 0) {
|
||||
deals.push(deal);
|
||||
if (deal.amazonDifferencePercent > 0) {
|
||||
deals.push(deal as Price);
|
||||
}
|
||||
}
|
||||
}
|
||||
});
|
||||
|
||||
// Sort to have the best deals on the top
|
||||
deals.sort((a, b) => a.amazonDifferencePercent < b.amazonDifferencePercent ? 1 : -1);
|
||||
deals.sort((a, b) => a.amazonDifferencePercent! < b.amazonDifferencePercent! ? 1 : -1);
|
||||
|
||||
// Return only as many records as requested or the maximum amount of found deals, whatever is less
|
||||
let maxAmt = Math.min(amount, deals.length);
|
||||
|
||||
for (let dealIndex = 0; dealIndex < maxAmt; dealIndex++){
|
||||
for (let dealIndex = 0; dealIndex < maxAmt; dealIndex++) {
|
||||
//console.log(deals[dealIndex]);
|
||||
priceRows.push(deals[dealIndex] as Price);
|
||||
}
|
||||
|
@ -280,6 +281,70 @@ export const getBestDeals = async (amount: number): Promise<Prices> => {
|
|||
return priceRows;
|
||||
};
|
||||
|
||||
/**
|
||||
* Get the lowest, latest, non-amazon price for each given product
|
||||
* @param ids the ids of the products
|
||||
*/
|
||||
export const findListByProducts = async (productIds: [number]): Promise<Prices> => {
|
||||
let conn;
|
||||
let priceRows: Price[] = [];
|
||||
try {
|
||||
conn = await pool.getConnection();
|
||||
|
||||
let allPrices: Record<number, Price[]> = {};
|
||||
|
||||
// Get newest prices for every given product at every vendor
|
||||
const rows = await conn.query(
|
||||
'WITH summary AS (\n' +
|
||||
' SELECT p.product_id,\n' +
|
||||
' p.vendor_id,\n' +
|
||||
' p.price_in_cents,\n' +
|
||||
' p.timestamp,\n' +
|
||||
' ROW_NUMBER() OVER(\n' +
|
||||
' PARTITION BY p.product_id, p.vendor_id\n' +
|
||||
' ORDER BY p.timestamp DESC) AS rk\n' +
|
||||
' FROM prices p' +
|
||||
' WHERE p.product_id IN (?)' +
|
||||
' AND p.vendor_id != 1)\n' +
|
||||
'SELECT s.*\n' +
|
||||
'FROM summary s\n' +
|
||||
'WHERE s.rk = 1', [productIds]);
|
||||
|
||||
// Write returned values to allPrices map with product id as key and a list of prices as value
|
||||
for (let row in rows) {
|
||||
if (row !== 'meta') {
|
||||
if (!allPrices[parseInt(rows[row].product_id)]) {
|
||||
allPrices[parseInt(rows[row].product_id)] = [];
|
||||
}
|
||||
|
||||
allPrices[parseInt(rows[row].product_id)].push(rows[row]);
|
||||
}
|
||||
}
|
||||
|
||||
// Iterate over all products to find lowest price
|
||||
Object.keys(allPrices).forEach(productId => {
|
||||
if (allPrices[parseInt(productId)]) {
|
||||
let pricesForProd = allPrices[parseInt(productId)];
|
||||
|
||||
// Sort ascending by price so index 0 has the lowest price
|
||||
pricesForProd.sort((a, b) => a.price_in_cents > b.price_in_cents ? 1 : -1);
|
||||
|
||||
// Push the lowest price to the return list
|
||||
priceRows.push(pricesForProd[0]);
|
||||
}
|
||||
});
|
||||
|
||||
} catch (err) {
|
||||
throw err;
|
||||
} finally {
|
||||
if (conn) {
|
||||
conn.end();
|
||||
}
|
||||
}
|
||||
|
||||
return priceRows;
|
||||
};
|
||||
|
||||
// export const create = async (newItem: Product): Promise<void> => {
|
||||
// let conn;
|
||||
// try {
|
||||
|
|
Loading…
Reference in New Issue
Block a user