<?php
/**
 * Config.php
 *
 * Reads unraid-podman's own settings so the WebUI and the shell-based
 * plugin scripts under plugin/sbin/ agree on where everything lives —
 * this file is the PHP-side counterpart of plugin/sbin/podman-common.sh's
 * podman_load_cfg() function, and intentionally mirrors its defaults and
 * paths exactly (see that script for the shell equivalent).
 */

declare(strict_types=1);

final class PodmanConfig
{
    public string $storagePath;
    public int $storageImageSizeGb;
    public bool $enabled;
    public int $stopTimeoutSeconds;
    public string $socketPath;
    public string $bootDir;
    public string $autostartFile;
    public string $autostartDelayFile;

    private function __construct()
    {
        // Defaults mirror podman-common.sh's podman_load_cfg() defaults.
        $this->bootDir = '/boot/config/plugins/podman';
        $this->storagePath = '/mnt/cache/system/podman';
        $this->storageImageSizeGb = 20;
        $this->enabled = true;
        $this->stopTimeoutSeconds = 10;
        $this->socketPath = '/var/run/podman/podman.sock';
        $this->autostartFile = $this->bootDir . '/autostart';
        $this->autostartDelayFile = $this->bootDir . '/autostart-delay';
    }

    public static function load(): self
    {
        $cfg = new self();

        $cfgFile = $cfg->bootDir . '/podman.cfg';
        if (is_readable($cfgFile)) {
            $values = self::parseShellStyleFile($cfgFile);
            if (isset($values['STORAGE_PATH'])) {
                $cfg->storagePath = $values['STORAGE_PATH'];
            }
            if (isset($values['STORAGE_IMAGE_SIZE_GB'])) {
                $cfg->storageImageSizeGb = (int) $values['STORAGE_IMAGE_SIZE_GB'];
            }
            if (isset($values['PODMAN_ENABLED'])) {
                $cfg->enabled = strtolower($values['PODMAN_ENABLED']) === 'yes';
            }
            if (isset($values['STOP_TIMEOUT'])) {
                $cfg->stopTimeoutSeconds = (int) $values['STOP_TIMEOUT'];
            }
        }

        return $cfg;
    }

    /**
     * Parses the simple `KEY="value"` / `KEY=value` shell-sourceable format
     * used by podman.cfg (see config/podman.cfg.example) WITHOUT executing
     * it as shell — this file is read by an unprivileged PHP-FPM worker,
     * so treating it as data rather than sourcing it is a deliberate
     * safety boundary, not just a convenience.
     *
     * @return array<string,string>
     */
    private static function parseShellStyleFile(string $path): array
    {
        $result = [];
        $lines = file($path, FILE_IGNORE_NEW_LINES | FILE_SKIP_EMPTY_LINES);
        if ($lines === false) {
            return $result;
        }

        foreach ($lines as $line) {
            $line = trim($line);
            if ($line === '' || str_starts_with($line, '#')) {
                continue;
            }
            if (!preg_match('/^([A-Z_][A-Z0-9_]*)=(.*)$/', $line, $m)) {
                continue;
            }
            [$_, $key, $value] = $m;
            $value = trim($value);
            // Strip one layer of matching quotes, if present.
            if (strlen($value) >= 2 && (
                ($value[0] === '"' && str_ends_with($value, '"')) ||
                ($value[0] === "'" && str_ends_with($value, "'"))
            )) {
                $value = substr($value, 1, -1);
            }
            $result[$key] = $value;
        }

        return $result;
    }

    public function newClient(): PodmanClient
    {
        return new PodmanClient($this->socketPath);
    }
}