<?php

namespace App\Http\Controllers\Hooks;

use App\Http\Controllers\Controller;
use App\Models\User;
use App\Telegram\TelegramBotContext;
use App\Telegram\TelegramRegistrar;
use Illuminate\Contracts\Cache\Repository as Cache;
use Illuminate\Http\Request;
use Illuminate\Http\Response;
use Illuminate\Support\Facades\Log;
use Nutgram\Laravel\RunningMode\LaravelWebhook;
use Psr\Log\LoggerInterface;
use SergiX44\Nutgram\Configuration;
use SergiX44\Nutgram\Nutgram;
use Throwable;

class TelegramWebhookController extends Controller
{
    public function __invoke(Request $request): Response
    {
        app(TelegramBotContext::class)->setAgent(null);

        return $this->handle(
            $request,
            expectedSecret: (string) config('coruna.telegram.webhook_secret', ''),
            resolveBot: static fn () => app(Nutgram::class),
            label: 'official',
        );
    }

    public function agent(Request $request, User $agent): Response
    {
        if (! $agent->isEnabled() || ! $agent->hasTelegramBot()) {
            abort(404);
        }

        app(TelegramBotContext::class)->setAgent($agent);
        $secret = TelegramBotContext::webhookSecretFor($agent);

        return $this->handle(
            $request,
            expectedSecret: $secret,
            resolveBot: function () use ($agent) {
                if (app()->runningUnitTests()) {
                    return app(Nutgram::class);
                }

                $bot = $this->makeAgentBot($agent);
                app(TelegramRegistrar::class)->registerAgent($bot, $agent);

                return $bot;
            },
            label: 'agent:'.$agent->id,
            requireSecret: true,
        );
    }

    /**
     * @param  callable(): Nutgram  $resolveBot
     */
    private function handle(
        Request $request,
        string $expectedSecret,
        callable $resolveBot,
        string $label,
        bool $requireSecret = false,
    ): Response {
        $raw = $request->getContent();
        $update = $request->all();
        if ($update === [] && is_string($raw) && $raw !== '') {
            $decoded = json_decode($raw, true);
            if (is_array($decoded)) {
                $update = $decoded;
            }
        }

        $message = is_array($update['message'] ?? null) ? $update['message'] : [];
        $chatId = $message['chat']['id'] ?? ($update['callback_query']['message']['chat']['id'] ?? null);
        $text = is_string($message['text'] ?? null) ? $message['text'] : null;
        $updateId = $update['update_id'] ?? null;
        $header = (string) $request->header('X-Telegram-Bot-Api-Secret-Token', '');

        $this->webhookLog('info', 'telegram webhook hit', [
            'bot' => $label,
            'ip' => $request->ip(),
            'update_id' => $updateId,
            'chat_id' => $chatId,
            'text' => $text,
            'has_secret_header' => $header !== '',
            'secret_configured' => $expectedSecret !== '',
            'body_bytes' => strlen($raw),
        ]);

        if ($requireSecret || $expectedSecret !== '') {
            if ($expectedSecret === '' || $header === '' || ! hash_equals($expectedSecret, $header)) {
                $this->webhookLog('warning', 'telegram webhook rejected: bad secret', [
                    'bot' => $label,
                    'ip' => $request->ip(),
                    'update_id' => $updateId,
                ]);
                abort(403, 'Invalid webhook secret');
            }
        }

        try {
            $bot = $resolveBot();
            $bot->run();
            $this->webhookLog('info', 'telegram webhook handled', [
                'bot' => $label,
                'update_id' => $updateId,
                'chat_id' => $chatId,
                'handler' => $bot->currentHandler()?->getPattern(),
            ]);
        } catch (Throwable $e) {
            $this->webhookLog('error', 'telegram webhook failed', [
                'bot' => $label,
                'message' => $e->getMessage(),
                'exception' => $e::class,
                'file' => $e->getFile().':'.$e->getLine(),
                'update_id' => $updateId,
                'chat_id' => $chatId,
                'trace' => collect(explode("\n", $e->getTraceAsString()))->take(12)->all(),
            ]);

            if (app()->runningUnitTests() && $e instanceof \InvalidArgumentException) {
                return response()->noContent();
            }
        }

        return response()->noContent();
    }

    private function makeAgentBot(User $agent): Nutgram
    {
        $configuration = new Configuration(
            apiUrl: config('nutgram.config.api_url', Configuration::DEFAULT_API_URL),
            botId: config('nutgram.config.bot_id'),
            botName: config('nutgram.config.bot_name'),
            testEnv: config('nutgram.config.test_env', false),
            isLocal: config('nutgram.config.is_local', false),
            clientTimeout: config('nutgram.config.timeout', Configuration::DEFAULT_CLIENT_TIMEOUT),
            clientOptions: config('nutgram.config.client', []),
            container: app(),
            hydrator: config('nutgram.config.hydrator', Configuration::DEFAULT_HYDRATOR),
            cache: app(Cache::class),
            logger: app(LoggerInterface::class)->channel(config('nutgram.log_channel', 'null')),
            localPathTransformer: config('nutgram.config.local_path_transformer'),
            pollingTimeout: config('nutgram.config.polling.timeout', Configuration::DEFAULT_POLLING_TIMEOUT),
            pollingAllowedUpdates: config('nutgram.config.polling.allowed_updates', Configuration::DEFAULT_ALLOWED_UPDATES),
            pollingLimit: config('nutgram.config.polling.limit', Configuration::DEFAULT_POLLING_LIMIT),
            enableHttp2: config('nutgram.config.enable_http2', Configuration::DEFAULT_ENABLE_HTTP2),
            conversationTtl: config('nutgram.config.conversation_ttl', Configuration::DEFAULT_CONVERSATION_TTL),
        );

        $bot = new Nutgram((string) $agent->bot_token, $configuration);
        $secret = TelegramBotContext::webhookSecretFor($agent);
        $webhook = new LaravelWebhook(
            getToken: static fn () => request()?->header('X-Telegram-Bot-Api-Secret-Token'),
            secretToken: $secret,
        );
        $webhook->setSafeMode(true);
        $bot->setRunningMode($webhook);

        return $bot;
    }

    /** @param  array<string, mixed>  $context */
    private function webhookLog(string $level, string $message, array $context = []): void
    {
        try {
            Log::{$level}($message, $context);
        } catch (Throwable) {
            error_log($message.' '.json_encode($context, JSON_UNESCAPED_UNICODE));
        }
    }
}