<?php
declare(strict_types=1);

/*
 * Keep faucet.env in the private web-project root, above the public directory.
 * For /var/www/project/public/faucet, the default file is:
 * /var/www/project/faucet.env
 */
$envFile = getenv('FAUCET_ENV_FILE') ?: dirname(__DIR__, 2) . '/faucet.env';
if (is_file($envFile)) {
    $lines = file($envFile, FILE_IGNORE_NEW_LINES);
    if ($lines === false) {
        throw new RuntimeException("Could not read faucet configuration: $envFile");
    }

    foreach ($lines as $lineNumber => $line) {
        $trimmed = trim($line);
        if ($trimmed === '' || str_starts_with($trimmed, '#')) {
            continue;
        }
        if (!str_contains($line, '=')) {
            throw new RuntimeException(
                'Invalid faucet configuration at line ' . ($lineNumber + 1)
            );
        }

        [$name, $value] = explode('=', $line, 2);
        $name = trim($name);
        $value = trim($value);
        if (preg_match('/^[A-Z][A-Z0-9_]*$/', $name) !== 1) {
            throw new RuntimeException(
                'Invalid faucet variable name at line ' . ($lineNumber + 1)
            );
        }

        if (strlen($value) >= 2) {
            $first = $value[0];
            $last = $value[strlen($value) - 1];
            if (($first === '"' && $last === '"') || ($first === "'" && $last === "'")) {
                $value = substr($value, 1, -1);
            }
        }

        // Real process variables override values from faucet.env.
        if (getenv($name) !== false) {
            continue;
        }
        putenv("$name=$value");
        $_ENV[$name] = $value;
    }
}

// Every configured filesystem path should be absolute in production.
return [
    'faucet_address' => getenv('FAUCET_ADDRESS') ?: '',
    'wallet_path' => getenv('CONTRACTLESS_WALLET_PATH') ?: '',
    'wallet_key' => getenv('CONTRACTLESS_WALLET_KEY') ?: '',
    'rpc_host' => getenv('CONTRACTLESS_RPC_HOST') ?: '127.0.0.1',
    'rpc_port' => (int) (getenv('CONTRACTLESS_RPC_PORT') ?: 50050),
    'rpc_timeout_seconds' => (float) (getenv('CONTRACTLESS_RPC_TIMEOUT') ?: 10),
    'composer_autoload' => getenv('FAUCET_COMPOSER_AUTOLOAD') ?: '',
    'claims_file' => getenv('FAUCET_CLAIMS_FILE') ?: __DIR__ . '/storage/claims.json',
    'lock_file' => getenv('FAUCET_LOCK_FILE') ?: __DIR__ . '/storage/claims.lock',
    'claim_amount_atomic' => 2_500_000_000,
    'transfer_fee_atomic' => 25_000_000,
    'cooldown_seconds' => 86_400,
    'minimum_request_interval_ms' => 250,
];