$shop = filter_input(INPUT_POST, "shop", FILTER_VALIDATE_INT);
$item = filter_input(INPUT_POST, "item", FILTER_SANITIZE_SPECIAL_CHARS);
$gold = filter_input(INPUT_POST, "gold", FILTER_VALIDATE_INT);

$itemData = json_decode($item);

$returnArray = [
    "success" => true,
    "message" => "oop",
    "gold" => $gold,
    "debug" => "work pls"
];
$itemExists = false;

if ($shop == 0) {
    $filename = "Shop1.json";
    $fh = fopen($filename, "r");
    $content = fread($fh, filesize($filename));
    $content = json_decode($content, true);
    for ($i = 0; $i < count($content); $i++) {
        foreach ($content[$i] as $key => $value) {
            $content[$i][$key] = filter_var($value, FILTER_SANITIZE_SPECIAL_CHARS);
        }
    }
    fclose($fh);

    $returnArray["gold"] = $gold + $itemData["price"];
    $returnArray["success"] = 'true';
    $returnArray["message"] = "Yeah, I can take that off your hands.";


    for ($i = 0; $i < count($content); $i++) {
        if ($content[$i]["id"] == $itemData["id"]) {
            $content[$i]["quantity"]++;
            $itemExists = true;
        }
    }

    if (!$itemExists) {
        $itemData["quantity"] = 1;
        $itemData["price"] = $itemData["price"] * 2;
        array_push($content, $itemData);
    }


    $returnArray["debug"] = $content;
    $fh = fopen($filename, "w");
    fwrite($fh, json_encode($content));
    fclose($fh);

    echo json_encode($returnArray);
}