<?php

namespace App\Services\Hosting;

use App\Models\HostingProduct;
use Illuminate\Support\Str;

class ServerPanelCapabilityService
{
    private const FUTURE_HOSTING_PANEL_CAPABILITIES = [
        'Files',
        'Databases',
        'Domains',
        'PHP',
        'SSL',
        'Cron',
        'Logs',
    ];

    /**
     * @param  array<string, mixed>  $selection
     * @param  array<string, mixed>  $catalog
     * @return array<string, mixed>
     */
    public function describeSelection(HostingProduct $product, array $selection, array $catalog): array
    {
        $license = $this->findOption((array) ($catalog['licenses'] ?? []), (string) ($selection['license'] ?? ''));
        $image = $this->findOption((array) ($catalog['images'] ?? []), (string) ($selection['image'] ?? ''));

        $licenseLabel = (string) ($license['label'] ?? 'Remote Login Only');
        $panel = (string) ($license['panel'] ?? '');
        $vendorLicense = (string) ($license['license'] ?? '');
        $osFamily = strtolower((string) ($image['os_family'] ?? 'linux'));
        $installLater = (bool) ($image['is_install_later'] ?? false);
        $supportedManagedImage = $this->supportedManagedImage($image);
        $linuxManagedCandidate = $panel === 'ladill'
            && ! $installLater
            && ! str_starts_with($osFamily, 'win')
            && $supportedManagedImage !== null;
        $supportedManagedImageLabels = array_values(array_filter(array_map(
            static fn (array $supported): string => (string) ($supported['label'] ?? ''),
            (array) config('hosting.server_order.managed_stack_supported_images', [])
        )));

        if ($panel === 'ladill') {
            return [
                'mode' => 'server_manager',
                'label' => $licenseLabel,
                'runtime' => 'provider_api',
                'is_ladill' => true,
                'managed_stack_candidate' => $linuxManagedCandidate,
                'managed_stack_supported_image' => $supportedManagedImage,
                'managed_stack_supported_image_labels' => $supportedManagedImageLabels,
                'hosting_panel_ready' => $linuxManagedCandidate,
                'future_hosting_panel_status' => $linuxManagedCandidate ? 'managed_stack_supported' : 'not_available',
                'current_capabilities' => [
                    'Power controls',
                    'Status sync',
                    'Instance details',
                    'SSH access',
                ],
                'future_capabilities' => $linuxManagedCandidate ? self::FUTURE_HOSTING_PANEL_CAPABILITIES : [],
                'primary_message' => $linuxManagedCandidate
                    ? 'Ladill Server Manager will provision this server with Ladill-managed controls on the selected supported Linux image.'
                    : 'Ladill Server Manager is not available for the selected image.',
                'secondary_message' => $linuxManagedCandidate
                    ? 'After provisioning finishes, Server Manager can handle power, status, files, databases, domains, PHP, SSL, cron, and logs.'
                    : 'Choose a plain supported Linux image without cPanel or Plesk. Supported Ladill-managed images: '.implode(', ', $supportedManagedImageLabels).'.',
                'manager_cta_label' => 'Open Server Manager',
                'hosting_panel_target_label' => 'Ladill Hosting Panel',
                'product_type' => $product->type,
            ];
        }

        if ($vendorLicense !== '') {
            return [
                'mode' => 'vendor_panel',
                'label' => $licenseLabel,
                'runtime' => 'in_server_panel',
                'is_ladill' => false,
                'managed_stack_candidate' => false,
                'hosting_panel_ready' => false,
                'future_hosting_panel_status' => 'external_panel',
                'current_capabilities' => [
                    'Provider provisioning',
                    'Server login',
                    'Installed panel management',
                ],
                'future_capabilities' => [],
                'primary_message' => "{$licenseLabel} will be the panel running inside this server. Ladill will not replace it with the shared hosting panel.",
                'secondary_message' => 'Use Ladill for order tracking and server lifecycle, then manage sites and services from the installed panel itself.',
                'manager_cta_label' => 'Open Panel',
                'hosting_panel_target_label' => 'Ladill Hosting Panel',
                'product_type' => $product->type,
            ];
        }

        return [
            'mode' => 'remote_login_only',
            'label' => $licenseLabel,
            'runtime' => 'ssh_only',
            'is_ladill' => false,
            'managed_stack_candidate' => false,
            'hosting_panel_ready' => false,
            'future_hosting_panel_status' => 'not_enabled',
            'current_capabilities' => [
                'Server login',
            ],
            'future_capabilities' => [],
            'primary_message' => 'This server will be provisioned without a Ladill-managed or commercial control panel.',
            'secondary_message' => 'You will manage the machine directly over SSH or RDP until a panel or managed stack is installed separately.',
            'manager_cta_label' => 'Open Access Details',
            'hosting_panel_target_label' => 'Ladill Hosting Panel',
            'product_type' => $product->type,
        ];
    }

    /**
     * @param  array<int, array<string, mixed>>  $options
     * @return array<string, mixed>|null
     */
    private function findOption(array $options, string $value): ?array
    {
        foreach ($options as $option) {
            if ((string) ($option['value'] ?? '') === $value) {
                return $option;
            }
        }

        return null;
    }

    /**
     * @param  array<string, mixed>|null  $image
     * @return array<string, mixed>|null
     */
    private function supportedManagedImage(?array $image): ?array
    {
        if ($image === null) {
            return null;
        }

        $value = Str::lower((string) ($image['value'] ?? ''));
        $label = Str::lower((string) ($image['label'] ?? ''));
        $osFamily = Str::lower((string) ($image['os_family'] ?? ''));

        if ($this->imageIncludesVendorPanel($label)) {
            return null;
        }

        foreach ((array) config('hosting.server_order.managed_stack_supported_images', []) as $supported) {
            if (($supported['os_family'] ?? 'linux') !== '' && Str::lower((string) ($supported['os_family'] ?? 'linux')) !== $osFamily) {
                continue;
            }

            $supportedValue = Str::lower((string) ($supported['value'] ?? ''));
            if ($supportedValue !== '' && $supportedValue === $value) {
                return $supported;
            }

            foreach ((array) ($supported['match'] ?? []) as $needle) {
                if ($needle !== '' && Str::contains($label, Str::lower((string) $needle))) {
                    return $supported;
                }
            }
        }

        return null;
    }

    private function imageIncludesVendorPanel(string $label): bool
    {
        foreach (['cpanel', 'plesk', 'whm'] as $needle) {
            if ($needle !== '' && Str::contains($label, $needle)) {
                return true;
            }
        }

        return false;
    }
}