<?php

namespace App\Http\Controllers\Hosting;

use App\Http\Controllers\Controller;
use App\Models\HostingAccount;
use App\Services\Hosting\BrowserTerminalSessionManager;
use Illuminate\Http\JsonResponse;
use Illuminate\Http\Request;

class HostingTerminalSessionController extends Controller
{
    public function __construct(
        private BrowserTerminalSessionManager $sessionManager,
    ) {}

    public function start(Request $request, HostingAccount $account): JsonResponse
    {
        $this->authorize('useTerminal', $account);
        $account->loadMissing('node');

        $validated = $request->validate([
            'path' => 'nullable|string|max:255',
            'cols' => 'nullable|integer|min:40|max:240',
            'rows' => 'nullable|integer|min:10|max:80',
        ]);

        $session = $this->sessionManager->createSession(
            $account,
            (int) $request->user()->id,
            (string) ($validated['path'] ?? '/public_html'),
            (int) ($validated['cols'] ?? 120),
            (int) ($validated['rows'] ?? 30),
        );

        return response()->json([
            'session_id' => $session['session_id'],
            'status' => $session['status'],
        ]);
    }

    public function read(Request $request, HostingAccount $account, string $session): JsonResponse
    {
        $this->authorize('useTerminal', $account);

        try {
            $payload = $this->sessionManager->readOutput(
                $account,
                (int) $request->user()->id,
                $session,
                (int) $request->integer('offset', 0),
            );
        } catch (\RuntimeException $e) {
            return response()->json(['message' => $e->getMessage()], 404);
        }

        return response()->json($payload);
    }

    public function input(Request $request, HostingAccount $account, string $session): JsonResponse
    {
        $this->authorize('useTerminal', $account);

        $input = $this->extractTerminalInput($request);

        if ($input === null) {
            return response()->json(['message' => 'Invalid terminal input payload.'], 422);
        }

        if (strlen($input) > 8192) {
            return response()->json(['message' => 'Terminal input payload is too large.'], 422);
        }

        if ($input === '') {
            return response()->json(['ok' => true]);
        }

        try {
            $this->sessionManager->appendInput(
                $account,
                (int) $request->user()->id,
                $session,
                $input,
            );
        } catch (\RuntimeException $e) {
            return response()->json(['message' => $e->getMessage()], 404);
        }

        return response()->json(['ok' => true]);
    }

    public function resize(Request $request, HostingAccount $account, string $session): JsonResponse
    {
        $this->authorize('useTerminal', $account);

        $validated = $request->validate([
            'cols' => 'required|integer|min:40|max:240',
            'rows' => 'required|integer|min:10|max:80',
        ]);

        try {
            $this->sessionManager->resizeSession(
                $account,
                (int) $request->user()->id,
                $session,
                (int) $validated['cols'],
                (int) $validated['rows'],
            );
        } catch (\RuntimeException $e) {
            return response()->json(['message' => $e->getMessage()], 404);
        }

        return response()->json(['ok' => true]);
    }

    public function close(Request $request, HostingAccount $account, string $session): JsonResponse
    {
        $this->authorize('useTerminal', $account);

        try {
            $this->sessionManager->closeSession(
                $account,
                (int) $request->user()->id,
                $session,
            );
        } catch (\RuntimeException $e) {
            return response()->json(['message' => $e->getMessage()], 404);
        }

        return response()->json(['ok' => true]);
    }

    private function extractTerminalInput(Request $request): ?string
    {
        $input = $request->input('input');

        if (is_string($input)) {
            return $input;
        }

        $raw = $request->getContent();

        if (! is_string($raw)) {
            return null;
        }

        if ($raw === '') {
            return '';
        }

        $decoded = json_decode($raw, true);

        if (is_array($decoded) && array_key_exists('input', $decoded) && is_string($decoded['input'])) {
            return $decoded['input'];
        }

        return $raw;
    }
}