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<?php
session_start();
include "db.php";

// Check if user is logged in
if (!isset($_SESSION['user_id'])) {
    echo json_encode([
        "status" => "error", 
        "message" => "Not logged in"
    ]);
    exit();
}

$user_id = $_SESSION['user_id'];

// Get the JSON data from the request
$json_data = file_get_contents('php://input');
$data = json_decode($json_data, true);

if (!$data || !isset($data['original_dutch']) || !isset($data['original_english']) || 
    !isset($data['new_dutch']) || !isset($data['new_english'])) {
    echo json_encode([
        "status" => "error", 
        "message" => "Invalid data provided"
    ]);
    exit();
}

$original_dutch = $data['original_dutch'];
$original_english = $data['original_english'];
$new_dutch = $data['new_dutch'];
$new_english = $data['new_english'];

// Basic validation
if (empty($new_dutch) || empty($new_english)) {
    echo json_encode([
        "status" => "error", 
        "message" => "Both Dutch and English words are required"
    ]);
    exit();
}

try {
    // Update the specific word
    $stmt = $conn->prepare("
        UPDATE words 
        SET dutch = ?, english = ? 
        WHERE user_id = ? AND dutch = ? AND english = ? 
        LIMIT 1
    ");
    $stmt->execute([$new_dutch, $new_english, $user_id, $original_dutch, $original_english]);
    
    if ($stmt->rowCount() > 0) {
        echo json_encode([
            "status" => "success", 
            "message" => "Word updated successfully"
        ]);
    } else {
        echo json_encode([
            "status" => "error", 
            "message" => "Word not found or no changes made"
        ]);
    }
} catch (PDOException $e) {
    echo json_encode([
        "status" => "error", 
        "message" => "Database error: " . $e->getMessage()
    ]);
}
?>

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