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// Download Composer
echo "Downloading Composer...\n";
$installer = fopen($composerUrl, 'rb');
if ($installer === false) {
    die("Error: Could not download Composer.\n");
}

$composerFile = fopen($composerPath, 'wb');
if ($composerFile === false) {
    die("Error: Could not create Composer file.\n");
}

while (!feof($installer)) {
    fwrite($composerFile, fread($installer, 8192));
}

fclose($installer);
fclose($composerFile);

echo "Composer downloaded successfully.\n";

// Make Composer executable (on Unix-based systems)
// Note: This part will not work on Windows environments
if (stripos(PHP_OS, 'WIN') === false) {
    echo "Setting executable permissions...\n";
    chmod($composerPath, 0755);
    echo "Permissions set.\n";
}

// Set COMPOSER_HOME environment variable if needed
$composerHome = __DIR__ . '/composer_home';
if (!file_exists($composerHome)) {
    mkdir($composerHome, 0700);
}

putenv('COMPOSER_HOME=' . $composerHome);
echo "Setting COMPOSER_HOME environment variable...\n";

// Run Composer install
echo "Running Composer install...\n";
exec("php $composerPath install 2>&1", $output, $returnVar);

if ($returnVar !== 0) {
    echo "Error: Composer install failed.\n";
    echo "Output:\n" . implode("\n", $output) . "\n";
} else {
    echo "Composer install completed successfully.\n";
}

// Provide instructions for manual usage if needed
echo "Composer has been downloaded as 'composer.phar'.\n";
echo "To install dependencies manually, run: php composer.phar install\n";