<?php

// Setup PDO
$dsn = "mysql:unix_socket=/var/run/mysqld/mysqld.sock;dbname=SYS_PRD_BND;charset=utf8mb4";
$options = [
    PDO::ATTR_ERRMODE            => PDO::ERRMODE_EXCEPTION,
    PDO::ATTR_DEFAULT_FETCH_MODE => PDO::FETCH_ASSOC,
];

try {
    $pdo = new PDO($dsn, "root", "", $options);

    // Fetch dependencies from PyPi table
    // Note: We select LibName. If AliasName represents a specific version or URI, it can be appended.
    $stmt = $pdo->query("SELECT LibName, AliasName FROM PyPi ORDER BY LibName");
    
    $requirements = [];
    foreach ($stmt as $row) {
        // Standard requirements.txt format is usually "PackageName" or "PackageName==Version"
        // If AliasName is used for versioning, you could use: $row['LibName'] . "==" . $row['AliasName']
        $requirements[] = $row['LibName'];
    }

    // Build requirements.txt content (Plain Text, one per line)
    $output = implode("\n", $requirements);

    // Write to file (stdout for Makefile redirection)
    file_put_contents('php://stdout', $output . "\n");
    file_put_contents("php://stderr", "✅ requirements.txt generated successfully.\n");

} catch (PDOException $e) {
    file_put_contents("php://stderr", "❌ Database error: " . $e->getMessage() . "\n");
}