<?php
    require_once __DIR__ . '/../../includes/connect_endpoint_crontabs.php';

    // Get all user ids

    $query = "SELECT id, username FROM user";
    $stmt = $db->prepare($query);
    $usersToUpdateExchange = $stmt->execute();

    while ($userToUpdateExchange = $usersToUpdateExchange->fetchArray(SQLITE3_ASSOC)) {
        $userId = $userToUpdateExchange['id'];
        echo "For user: " . $userToUpdateExchange['username'] . "<br />";

        $query = "SELECT api_key, provider FROM fixer WHERE user_id = :userId";
        $stmt = $db->prepare($query);
        $stmt->bindParam(':userId', $userId, SQLITE3_INTEGER);
        $result = $stmt->execute();

        if ($result) {
            $row = $result->fetchArray(SQLITE3_ASSOC);
            
            if ($row) {
                $apiKey = $row['api_key'];
                $provider = $row['provider'];

                $codes = "";
                $query = "SELECT id, name, symbol, code FROM currencies WHERE user_id = :userId";
                $stmt = $db->prepare($query);
                $stmt->bindParam(':userId', $userId, SQLITE3_INTEGER);
                $result = $stmt->execute();
                while ($row = $result->fetchArray(SQLITE3_ASSOC)) {
                    $codes .= $row['code'].",";
                }
                $codes = rtrim($codes, ',');
                $query = "SELECT u.main_currency, c.code FROM user u LEFT JOIN currencies c ON u.main_currency = c.id WHERE u.id = :userId";
                $stmt = $db->prepare($query);
                $stmt->bindParam(':userId', $userId, SQLITE3_INTEGER);
                $result = $stmt->execute();
                $row = $result->fetchArray(SQLITE3_ASSOC);
                $mainCurrencyCode = $row['code'];
                $mainCurrencyId = $row['main_currency'];

                if ($provider === 1) {
                    $api_url = "https://api.apilayer.com/fixer/latest?base=EUR&symbols=" . $codes;
                    $context = stream_context_create([
                        'http' => [
                            'method' => 'GET',
                            'header' => 'apikey: ' . $apiKey,
                        ]
                    ]);
                    $response = file_get_contents($api_url, false, $context);
                } else {
                    $api_url = "http://data.fixer.io/api/latest?access_key=". $apiKey . "&base=EUR&symbols=" . $codes;
                    $response = file_get_contents($api_url);
                }

                $apiData = json_decode($response, true);

                $mainCurrencyToEUR = $apiData['rates'][$mainCurrencyCode];

                if ($apiData !== null && isset($apiData['rates'])) {
                    foreach ($apiData['rates'] as $currencyCode => $rate) {
                        if ($currencyCode === $mainCurrencyCode) {
                            $exchangeRate = 1.0;
                        } else {
                            $exchangeRate = $rate / $mainCurrencyToEUR;
                        }
                        $updateQuery = "UPDATE currencies SET rate = :rate WHERE code = :code";
                        $updateStmt = $db->prepare($updateQuery);
                        $updateStmt->bindParam(':rate', $exchangeRate, SQLITE3_TEXT);
                        $updateStmt->bindParam(':code', $currencyCode, SQLITE3_TEXT);
                        $updateResult = $updateStmt->execute();

                        if (!$updateResult) {
                            echo "Error updating rate for currency: $currencyCode <br />";
                        }
                    }
                    $currentDate = new DateTime();
                    $formattedDate = $currentDate->format('Y-m-d');

                    $deleteQuery = "DELETE FROM last_exchange_update WHERE user_id = :userId";
                    $deleteStmt = $db->prepare($deleteQuery);
                    $deleteResult = $deleteStmt->execute();

                    $query = "INSERT INTO last_exchange_update (date, user_id) VALUES (:formattedDate, :userId)";
                    $stmt = $db->prepare($query);
                    $stmt->bindParam(':formattedDate', $formattedDate, SQLITE3_TEXT);
                    $stmt->bindParam(':userId', $userId, SQLITE3_INTEGER);
                    $result = $stmt->execute();

                    $db->close();
                    echo "Rates updated successfully!<br />";
                }
            } else {
                echo "Exchange rates update skipped. No fixer.io api key provided<br />";
                $apiKey = null;
            }
        } else {
            echo "Exchange rates update skipped. No fixer.io api key provided<br />";
            $apiKey = null;
        }

    }

?>