#!/usr/bin/env php
<?php

declare(strict_types=1);

/**
 * Applies environment-provided overrides to a Ktrix server's config/system.php.
 *
 * Used by action-server-install to point a freshly checked-out server at the
 * database and settings provided by the calling CI workflow, without hand
 * editing the repository's committed config file.
 *
 * Usage: php configure-server.php <path-to-config/system.php>
 *
 * All overrides are read from environment variables and are optional; an
 * unset or empty variable leaves the corresponding config value untouched:
 *   DATABASE_URI     -> $config['database']['uri']
 *   DATABASE_NAME    -> $config['database']['database']
 *   APP_ENVIRONMENT  -> $config['environment']
 *   SECURITY_SALT    -> $config['security.salt']
 */

$path = $argv[1] ?? null;

if (!$path || !is_file($path)) {
    fwrite(STDERR, "Configuration file not found: {$path}\n");
    exit(1);
}

$config = include $path;

if (!is_array($config)) {
    fwrite(STDERR, "Configuration file did not return an array: {$path}\n");
    exit(1);
}

// Nested overrides: env var => [top-level key, nested key]
$nestedOverrides = [
    'DATABASE_URI' => ['database', 'uri'],
    'DATABASE_NAME' => ['database', 'database'],
];

foreach ($nestedOverrides as $env => [$group, $key]) {
    $value = getenv($env);
    if ($value === false || $value === '') {
        continue;
    }
    $config[$group][$key] = $value;
    echo "  - {$group}.{$key} overridden\n";
}

// Flat overrides: env var => config key
$flatOverrides = [
    'APP_ENVIRONMENT' => 'environment',
    'SECURITY_SALT' => 'security.salt',
];

foreach ($flatOverrides as $env => $key) {
    $value = getenv($env);
    if ($value === false || $value === '') {
        continue;
    }
    $config[$key] = $value;
    echo "  - {$key} overridden\n";
}

$export = var_export($config, true);
file_put_contents($path, "<?php\n\nreturn {$export};\n");

echo "Configuration written to {$path}\n";