<?php

namespace App\Http\Controllers\Hosting;

use App\Http\Controllers\Controller;
use App\Models\CustomerHostingOrder;
use App\Services\Hosting\PanelRuntimes\ServerAgentPanelRuntime;
use App\Services\Hosting\ServerAgentBootstrapService;
use App\Services\Hosting\Providers\ContaboProvider;
use Illuminate\Http\RedirectResponse;
use Illuminate\Http\Request;
use Illuminate\View\View;

class ServerPanelController extends Controller
{
    public function show(Request $request, CustomerHostingOrder $order): View
    {
        $order = $this->authorizedOrder($request, $order);
        $panelRuntime = (array) data_get($order->meta, 'server_panel_runtime', data_get($order->meta, 'server_order.panel_snapshot', []));

        if ((bool) ($panelRuntime['managed_stack_candidate'] ?? false)) {
            app(ServerAgentBootstrapService::class)->ensureBootstrap($order);
            $order->refresh();
            $panelRuntime = (array) data_get($order->meta, 'server_panel_runtime', data_get($order->meta, 'server_order.panel_snapshot', []));
        }

        return view('hosting.server-panel.show', [
            'order' => $order,
            'panelState' => (array) data_get($order->meta, 'server_panel', []),
            'panelRuntime' => $panelRuntime,
            'selectionSummary' => (array) data_get($order->meta, 'server_order.selection_summary', []),
            'serverAgent' => $order->serverAgent,
            'serverTasks' => $order->serverTasks()->latest('id')->limit(12)->get(),
            'serverSites' => $order->serverSites()->latest('updated_at')->limit(6)->get(),
            'serverDatabases' => $order->serverDatabases()->latest('updated_at')->limit(6)->get(),
            'serverFiles' => $order->serverFiles()->latest('last_synced_at')->limit(8)->get(),
        ]);
    }

    public function sync(Request $request, CustomerHostingOrder $order, ContaboProvider $provider): RedirectResponse
    {
        $order = $this->authorizedOrder($request, $order);
        $instance = $provider->getInstance($this->providerInstanceId($order));

        abort_if($instance === null, 404, 'Server instance not found.');

        $this->updateOrderState($order, $instance);

        return back()->with('success', 'Server status refreshed.');
    }

    public function power(Request $request, CustomerHostingOrder $order, string $action, ContaboProvider $provider): RedirectResponse
    {
        $order = $this->authorizedOrder($request, $order);

        abort_unless(in_array($action, ['start', 'stop', 'reboot'], true), 404);

        $instanceId = $this->providerInstanceId($order);
        $success = match ($action) {
            'start' => $provider->startInstance($instanceId),
            'stop' => $provider->stopInstance($instanceId),
            'reboot' => $provider->rebootInstance($instanceId),
        };

        if (! $success) {
            return back()->with('error', 'Server action failed. Please try again.');
        }

        $meta = (array) ($order->meta ?? []);
        $panelState = (array) ($meta['server_panel'] ?? []);
        $panelState['last_action'] = [
            'name' => $action,
            'at' => now()->toIso8601String(),
        ];
        $panelState['power_status'] = match ($action) {
            'stop' => 'off',
            default => 'on',
        };

        $order->update([
            'meta' => array_merge($meta, ['server_panel' => $panelState]),
        ]);

        return back()->with('success', ucfirst($action).' request sent successfully.');
    }

    public function queueDomain(Request $request, CustomerHostingOrder $order, ServerAgentPanelRuntime $runtime): RedirectResponse
    {
        $order = $this->authorizedManagedOrder($request, $order);

        $validated = $request->validate([
            'domain' => ['required', 'string', 'max:255', 'regex:/^[a-zA-Z0-9][a-zA-Z0-9-_.]+\.[a-zA-Z]{2,}$/'],
            'document_root' => ['nullable', 'string', 'max:255'],
            'php_version' => ['nullable', 'string', 'in:8.0,8.1,8.2,8.3,8.4'],
        ]);

        $runtime->queueDomainTask(
            $order,
            $validated['domain'],
            $validated['document_root'] ?? null,
            $validated['php_version'] ?? null,
        );

        return back()->with('success', 'Domain task queued for the server agent.');
    }

    public function queueDatabase(Request $request, CustomerHostingOrder $order, ServerAgentPanelRuntime $runtime): RedirectResponse
    {
        $order = $this->authorizedManagedOrder($request, $order);

        $validated = $request->validate([
            'name' => ['required', 'string', 'max:32', 'regex:/^[a-zA-Z0-9_]+$/'],
        ]);

        $runtime->queueDatabaseTask($order, $validated['name']);

        return back()->with('success', 'Database task queued for the server agent.');
    }

    public function queueSsl(Request $request, CustomerHostingOrder $order, ServerAgentPanelRuntime $runtime): RedirectResponse
    {
        $order = $this->authorizedManagedOrder($request, $order);

        $validated = $request->validate([
            'domain' => ['required', 'string', 'max:255', 'regex:/^[a-zA-Z0-9][a-zA-Z0-9-_.]+\.[a-zA-Z]{2,}$/'],
        ]);

        $runtime->queueSslTask($order, $validated['domain']);

        return back()->with('success', 'SSL task queued for the server agent.');
    }

    public function queueFile(Request $request, CustomerHostingOrder $order, ServerAgentPanelRuntime $runtime): RedirectResponse
    {
        $order = $this->authorizedManagedOrder($request, $order);

        $validated = $request->validate([
            'operation' => ['required', 'string', 'in:list,read,write'],
            'path' => ['required', 'string', 'max:1000'],
            'content' => ['nullable', 'string'],
        ]);

        $runtime->queueFileTask(
            $order,
            $validated['operation'],
            $validated['path'],
            $validated['content'] ?? null,
        );

        return back()->with('success', 'File task queued for the server agent.');
    }

    public function queueSiteDelete(Request $request, CustomerHostingOrder $order, ServerAgentPanelRuntime $runtime): RedirectResponse
    {
        $order = $this->authorizedManagedOrder($request, $order);

        $validated = $request->validate([
            'domain' => ['required', 'string', 'max:255', 'regex:/^[a-zA-Z0-9][a-zA-Z0-9-_.]+\.[a-zA-Z]{2,}$/'],
        ]);

        $runtime->queueSiteDeleteTask($order, $validated['domain']);

        return back()->with('success', 'Site removal task queued for the server agent.');
    }

    public function queuePhp(Request $request, CustomerHostingOrder $order, ServerAgentPanelRuntime $runtime): RedirectResponse
    {
        $order = $this->authorizedManagedOrder($request, $order);

        $validated = $request->validate([
            'domain' => ['required', 'string', 'max:255', 'regex:/^[a-zA-Z0-9][a-zA-Z0-9-_.]+\.[a-zA-Z]{2,}$/'],
            'php_version' => ['required', 'string', 'in:8.0,8.1,8.2,8.3,8.4'],
        ]);

        $runtime->queuePhpTask($order, $validated['domain'], $validated['php_version']);

        return back()->with('success', 'PHP configuration task queued for the server agent.');
    }

    public function queueCron(Request $request, CustomerHostingOrder $order, ServerAgentPanelRuntime $runtime): RedirectResponse
    {
        $order = $this->authorizedManagedOrder($request, $order);

        $validated = $request->validate([
            'operation' => ['required', 'string', 'in:list,upsert,remove'],
            'name' => ['nullable', 'string', 'max:80', 'regex:/^[a-zA-Z0-9._-]+$/'],
            'expression' => ['nullable', 'string', 'max:120'],
            'command' => ['nullable', 'string', 'max:1000'],
            'user' => ['nullable', 'string', 'in:web,root,www-data,nginx,wwwrun,apache'],
        ]);

        if (($validated['operation'] ?? '') !== 'list') {
            $request->validate([
                'name' => ['required', 'string', 'max:80', 'regex:/^[a-zA-Z0-9._-]+$/'],
            ]);
        }

        if (($validated['operation'] ?? '') === 'upsert') {
            $request->validate([
                'expression' => ['required', 'string', 'max:120'],
                'command' => ['required', 'string', 'max:1000'],
            ]);
        }

        $runtime->queueCronTask(
            $order,
            $validated['operation'],
            $validated['name'] ?? null,
            $validated['expression'] ?? null,
            $validated['command'] ?? null,
            $validated['user'] ?? 'web',
        );

        return back()->with('success', 'Cron task queued for the server agent.');
    }

    public function queueLog(Request $request, CustomerHostingOrder $order, ServerAgentPanelRuntime $runtime): RedirectResponse
    {
        $order = $this->authorizedManagedOrder($request, $order);

        $validated = $request->validate([
            'target' => ['required', 'string', 'in:nginx_access,nginx_error,php_fpm,mariadb,agent_service'],
            'domain' => ['nullable', 'string', 'max:255', 'regex:/^[a-zA-Z0-9][a-zA-Z0-9-_.]*\.[a-zA-Z]{2,}$/'],
            'lines' => ['nullable', 'integer', 'min:20', 'max:500'],
        ]);

        if (in_array($validated['target'], ['nginx_access', 'nginx_error'], true)) {
            $request->validate([
                'domain' => ['required', 'string', 'max:255', 'regex:/^[a-zA-Z0-9][a-zA-Z0-9-_.]*\.[a-zA-Z]{2,}$/'],
            ]);
        }

        $runtime->queueLogTask(
            $order,
            $validated['target'],
            $validated['domain'] ?? null,
            (int) ($validated['lines'] ?? 120),
        );

        return back()->with('success', 'Log read task queued for the server agent.');
    }

    private function authorizedOrder(Request $request, CustomerHostingOrder $order): CustomerHostingOrder
    {
        abort_if($order->user_id !== $request->user()->id, 403);

        $order->load('product');
        abort_unless($order->product?->requiresContabo(), 404);
        abort_unless($this->ladillPanelEnabled($order), 404);

        return $order;
    }

    private function ladillPanelEnabled(CustomerHostingOrder $order): bool
    {
        $license = (string) data_get($order->meta, 'server_order.selection.license', '');

        return (string) data_get(config('hosting.server_order.licenses'), $license.'.panel') === 'ladill';
    }

    private function providerInstanceId(CustomerHostingOrder $order): string
    {
        $instanceId = (string) data_get($order->meta, 'contabo_instance_id', '');
        abort_if($instanceId === '', 404, 'Server instance is not provisioned yet.');

        return $instanceId;
    }

    /**
     * @param  array<string, mixed>  $instance
     */
    private function updateOrderState(CustomerHostingOrder $order, array $instance): void
    {
        $meta = (array) ($order->meta ?? []);
        $panelState = (array) ($meta['server_panel'] ?? []);

        $panelState = array_merge($panelState, [
            'instance_status' => $instance['status'] ?? null,
            'power_status' => $instance['power_status'] ?? null,
            'region' => $instance['region'] ?? null,
            'datacenter' => $instance['datacenter'] ?? null,
            'image' => $instance['image'] ?? null,
            'last_synced_at' => now()->toIso8601String(),
        ]);

        $order->update([
            'server_ip' => $instance['ip_address'] ?? $order->server_ip,
            'meta' => array_merge($meta, ['server_panel' => $panelState]),
        ]);
    }

    private function authorizedManagedOrder(Request $request, CustomerHostingOrder $order): CustomerHostingOrder
    {
        $order = $this->authorizedOrder($request, $order);
        abort_unless((bool) data_get($order->meta, 'server_panel_runtime.managed_stack_candidate', false), 404);

        return $order;
    }
}