<?php

namespace App\Http\Controllers;

use App\Channels\TelegramChannel;
use App\Delivery\EventActions;
use App\Enums\ChannelType;
use App\Models\Channel;
use App\Models\Delivery;
use Illuminate\Http\Request;
use Illuminate\Http\Response;
use Illuminate\Support\Facades\Cache;

class TelegramWebhookController extends Controller
{
    public function __construct(
        private readonly TelegramChannel $telegram,
        private readonly EventActions $actions,
    ) {}

    public function __invoke(Request $request): Response
    {
        $expected = (string) config('hado.telegram.webhook_secret');
        $given = (string) $request->header('X-Telegram-Bot-Api-Secret-Token', '');
        abort_unless($expected !== '' && hash_equals($expected, $given), 403);

        if (is_array($message = $request->input('message'))) {
            $this->message($message);
        }
        if (is_array($callback = $request->input('callback_query'))) {
            $this->callback($callback);
        }

        return response()->noContent();
    }

    private function message(array $message): void
    {
        $chatId = $message['chat']['id'] ?? null;
        if ($chatId === null) {
            return;
        }
        $this->telegram->touch($chatId);

        if (! preg_match('~^/start\s+(\S+)~', (string) ($message['text'] ?? ''), $m)) {
            return;
        }

        $userId = Cache::pull('tg:link:'.$m[1]);
        if ($userId === null) {
            $this->telegram->sendText($chatId, 'Код не найден или устарел. Сгенерируй новый в инбоксе Hado.');

            return;
        }

        Channel::updateOrCreate(
            ['user_id' => $userId, 'type' => ChannelType::Telegram->value],
            ['config' => ['chat_id' => $chatId], 'enabled' => true],
        );
        $this->telegram->sendText($chatId, 'Подключено');
    }

    private function callback(array $callback): void
    {
        $chatId = $callback['message']['chat']['id'] ?? null;
        if ($chatId !== null) {
            $this->telegram->touch($chatId);
        }

        [$action, $token] = array_pad(explode(':', (string) ($callback['data'] ?? ''), 2), 2, '');
        $delivery = Delivery::where('action_token', $token)->with('event.user')->first();

        if ($delivery === null || $delivery->event->isTerminal() || ! in_array($action, ['ack', 'done'], true)) {
            $this->telegram->answerCallback((string) $callback['id'], 'Уже неактуально');

            return;
        }

        if ($action === 'done') {
            $this->actions->done($delivery->event);
            $this->telegram->answerCallback((string) $callback['id'], 'Закрыто');
        } else {
            $this->actions->ack($delivery->event);
            $this->telegram->answerCallback((string) $callback['id'], 'Ок, напомню позже');
        }
    }
}