goldscrap.html

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>PMC</title>
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    <link rel="icon" type="image/png" sizes="16x16" href="favicon/favicon-16x16.png">
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    <link rel="manifest" href="site.webmanifest">
    <link rel="stylesheet" type="text/css" href="styles.css">
    <style>
        label {
            color: gold;
        }
    </style>
</head>
<body>
    <div>
        <label for="grams">Grams:</label>       
    </div>
    <div>
        <input id="grams" inputmode="numeric" autofocus />
    </div>
    <div>
        <label for="karat">Karat:</label>       
    </div>
    <div>
        <select id="karat">
            <option value="10K">10K</option>
            <option value="14K">14K</option>
            <option value="18K">18K</option>
        </select>
    </div>    
    <div>
        <button id="calcPriceBtn" onclick="calcPrice()">Calculate</button>
    </div>
    <div>
        <label for="tradeValue">Trade:</label>
    </div>
    <div>
        <input readonly id="tradeValue" />
    </div>
    <div>
        <label for="scrapValue">Scrap:</label>
    </div>
    <div>
        <input readonly id="scrapValue" />
    </div>
    <div>
        <br>
        <label><i>Details...</i></label>
    </div>
    <div>
        <label for="gldSptPrc">gold spot price:</label>
    </div>
    <div>
        <input readonly id="gldSptPrc" />
    </div>
    <div>
        <label for="spotFluc">spot fluc subtrahend:</label>
    </div>
    <div>
        <input readonly id="spotFluc" />
    </div>
    <div>
        <label for="prsdGrmInpt">parsed gram input:</label>
    </div>
    <div>
        <input readonly id="prsdGrmInpt" />
    </div>
    <div>
        <label for="troyOzToGrmsFctr">toz to grm factor:</label>
    </div>
    <div>
        <input readonly id="troyOzToGrmsFctr" />
    </div>
    <div>
        <label for="krtFct">karat factor:</label>
    </div>
    <div>
        <input readonly id="krtFct" />
    </div>
    <div>
        <label for="rfDrt">refine/dirt factor:</label>
    </div>
    <div>
        <input readonly id="rfDrt" />
    </div>
    <div>
        <br>
        <label><i>Notes...</i></label>
    </div>
    <div>The spot price is set by calling a web service to get the current bid price at the moment. This price is in dollars per troy ounce. The bid price shows what buyers are currently willing to pay. Therefore, this is the foundation for what we are willing to pay the customer.</div>
    <script src="metalprices.js"></script>
    <script src="todoist.js"></script>
    <script>
        async function calcPrice() {
            const troyOuncesToGramsFactor = 0.0322;
            const fluctuatingPriceFactor = 100.0;
            const refineryFeeAndDirtFactor = 0.9175;

            let gramValue = document.getElementById('grams').value;
            let karatValue = document.getElementById('karat').value;

            let gramNumber = parseFloat(gramValue);
            let karatFactor = 0.0;
            if (karatValue == "10K") {
                karatFactor = 10.0 / 24.0;
            }
            else if (karatValue == "14K") {
                karatFactor = 14.0 / 24.0;
            }
            else if (karatValue == "18K") {
                karatFactor = 18.0 / 24.0;
            }
            let curSpt = await fetchBidPrice("gold");
            let fullValueForTrade = gramNumber * (curSpt - fluctuatingPriceFactor) * troyOuncesToGramsFactor * karatFactor * refineryFeeAndDirtFactor;
            let halfValueForScrap = fullValueForTrade / 2.0;
            let tradePriceDisp = fullValueForTrade.toFixed(2);
            let scrapPriceDisp = halfValueForScrap.toFixed(2);
            let curSptDisp = curSpt.toFixed(2);

            document.getElementById('tradeValue').value = "$" + tradePriceDisp;
            document.getElementById('scrapValue').value = "$" + scrapPriceDisp;

            document.getElementById('gldSptPrc').value = "$" + curSptDisp;
            document.getElementById('spotFluc').value = fluctuatingPriceFactor;
            document.getElementById('prsdGrmInpt').value = gramNumber;
            document.getElementById('troyOzToGrmsFctr').value = troyOuncesToGramsFactor;
            document.getElementById('krtFct').value = karatFactor;
            document.getElementById('rfDrt').value = refineryFeeAndDirtFactor;

writeToLog(`
GOLD SCRAP
Trade: ${tradePriceDisp}
Scrap: ${scrapPriceDisp}
Spot: ${curSptDisp}
Fluc: ${fluctuatingPriceFactor}
Grams: ${gramNumber}
Gram Factor: ${troyOuncesToGramsFactor}
Karat Factor: ${karatFactor}
Refine/Dirt Factor: ${refineryFeeAndDirtFactor}
`);
        }

        //make enter the accept button
        document.getElementById('grams').onkeydown = function (event) {
            if (event.key === 'Enter') {
                event.preventDefault();
                calcPrice();
            }
        };
    </script>
</body>
</html>