<?php
declare(strict_types=1);

namespace MageSail\Magesail\Block\Adminhtml;

use Magento\Backend\Block\Template;
use Magento\Backend\Block\Template\Context;
use MageSail\Magesail\Model\TunnelStatus;
use MageSail\Magesail\Model\TunnelStoreProvisioner;

class Tunnel extends Template
{
    private const LOG_TAIL_BYTES = 8192;
    private const LOG_TAIL_LINES = 40;

    public function __construct(
        Context $context,
        private readonly TunnelStatus $tunnelStatus,
        private readonly TunnelStoreProvisioner $tunnelStoreProvisioner,
        array $data = []
    ) {
        parent::__construct($context, $data);
    }

    /**
     * @return array{running: bool, pid: int|null, key: string|null}
     */
    public function getTunnelStatus(): array
    {
        return $this->tunnelStatus->getStatus();
    }

    /**
     * Persisted tunnel store (present while tunnel is configured; may exist briefly before PID appears).
     *
     * @return array{store_id: int, store_code: string, unsecure_base_url: string, secure_base_url: string, use_secure_urls: bool}|null
     */
    public function getTunnelStoreState(): ?array
    {
        return $this->tunnelStoreProvisioner->getPersistedState();
    }

    public function getTunnelStoreCodeConstant(): string
    {
        return TunnelStoreProvisioner::STORE_CODE;
    }

    /**
     * Strip scheme for display so Admin shows hostname-only; persisted URLs stay full in state.
     */
    public function getTunnelHostDisplay(?string $baseUrl): string
    {
        if ($baseUrl === null || $baseUrl === '') {
            return '';
        }
        $parts = parse_url($baseUrl);
        if ($parts === false || empty($parts['host'])) {
            return $baseUrl;
        }
        $out = $parts['host'];
        if (!empty($parts['port'])) {
            $out .= ':' . $parts['port'];
        }
        if (!empty($parts['path']) && $parts['path'] !== '/' && $parts['path'] !== '') {
            $out .= rtrim($parts['path'], '/');
        }
        return $out;
    }

    public function getConfigUrl(): string
    {
        return $this->getUrl('adminhtml/system_config/edit/section/magesail');
    }

    public function getStatusUrl(): string
    {
        return $this->getUrl('*/*/status');
    }

    public function getIndexUrl(): string
    {
        return $this->getUrl('*/*/index');
    }

    public function getLogtailUrl(): string
    {
        return $this->getUrl('*/*/logtail');
    }

    public function getFormKey(): string
    {
        return $this->formKey->getFormKey();
    }

    public function getLogFilePath(): string
    {
        return $this->tunnelStatus->getLogFilePath();
    }

    /**
     * @return string[]
     */
    public function getRecentLogLines(): array
    {
        $path = $this->tunnelStatus->getLogFilePath();
        if (!\is_readable($path)) {
            return [];
        }
        $size = filesize($path);
        if ($size === false || $size === 0) {
            return [];
        }
        $fp = fopen($path, 'rb');
        if ($fp === false) {
            return [];
        }
        $start = max(0, $size - self::LOG_TAIL_BYTES);
        fseek($fp, $start);
        if ($start > 0) {
            fgets($fp);
        }
        $chunk = stream_get_contents($fp) ?: '';
        fclose($fp);
        $lines = preg_split('/\R/', $chunk) ?: [];
        $lines = array_values(array_filter($lines, static fn ($l) => $l !== ''));
        if (\count($lines) > self::LOG_TAIL_LINES) {
            $lines = \array_slice($lines, -self::LOG_TAIL_LINES);
        }
        return $lines;
    }
}