<?php
namespace App\Services\Catalog;

use App\Models\ProductOffer;
use Illuminate\Support\Facades\Http;
use Illuminate\Support\Str;
use RuntimeException;

class TelegramOffersPublisher
{
    /** @return array<string, mixed> */
    public function publishOffer(ProductOffer $offer, ?string $chatId = null, bool $dryRun = false): array
    {
        $token       = trim((string) config('services.telegram.offers_bot_token', ''));
        $chatId      = trim((string) ($chatId ?: config('services.telegram.offers_chat_id', '')));
        $channelName = trim((string) config('services.telegram.offers_channel_name', ''));
        $message     = $this->buildMessage($offer);
        $imageUrl    = $this->resolveImageUrl($offer);

        if ($dryRun) {
            return [
                'ok'           => true,
                'dry_run'      => true,
                'chat_id'      => $chatId,
                'channel_name' => $channelName,
                'image_url'    => $imageUrl,
                'message'      => $message,
                'offer_id'     => (int) $offer->id,
            ];
        }

        if ($token === '') {
            throw new RuntimeException('TELEGRAM_OFFERS_BOT_TOKEN non configurato.');
        }

        if ($chatId === '') {
            throw new RuntimeException('TELEGRAM_OFFERS_CHAT_ID non configurato.');
        }

        $baseUrl    = 'https://api.telegram.org/bot' . $token;
        $response   = null;
        $usedMethod = 'sendMessage';

        if ($imageUrl !== null) {
            $response = Http::asForm()->post($baseUrl . '/sendPhoto', [
                'chat_id' => $chatId,
                'photo'   => $imageUrl,
                'caption' => Str::limit($message, 1024, ''),
            ]);
            $usedMethod = 'sendPhoto';
        }

        if (! $response || ! $response->ok()) {
            $response = Http::asForm()->post($baseUrl . '/sendMessage', [
                'chat_id'                  => $chatId,
                'text'                     => $message,
                'disable_web_page_preview' => false,
            ]);
            $usedMethod = 'sendMessage';
        }

        return [
            'ok'           => $response->ok(),
            'dry_run'      => false,
            'chat_id'      => $chatId,
            'channel_name' => $channelName,
            'method'       => $usedMethod,
            'image_url'    => $imageUrl,
            'offer_id'     => (int) $offer->id,
            'status'       => $response->status(),
            'response'     => $response->json(),
            'message'      => $message,
        ];
    }

    private function buildMessage(ProductOffer $offer): string
    {
        $payload = is_array($offer->meta['payload'] ?? null) ? $offer->meta['payload'] : [];
        $product = $offer->product;

        $lines = array_values(array_filter([
            'Offerta Amazon NetGescon',
            trim((string) ($offer->title ?: $product?->name ?: 'Prodotto Amazon')),
            trim((string) ($product?->internal_code ?? '')) !== '' ? 'Catalogo: ' . trim((string) $product?->internal_code) : null,
            $this->formatMoney($offer->price_amount, (string) ($offer->currency ?: data_get($payload, 'currency', 'EUR')), 'Prezzo'),
            $this->formatMoney($offer->price_compare_at, (string) ($offer->currency ?: data_get($payload, 'currency', 'EUR')), 'Listino'),
            trim((string) ($offer->availability ?: data_get($payload, 'availability', ''))) !== '' ? 'Disponibilita: ' . trim((string) ($offer->availability ?: data_get($payload, 'availability', ''))): null,
            trim((string) data_get($payload, 'asin', $offer->external_product_id)) !== '' ? 'ASIN: ' . trim((string) data_get($payload, 'asin', $offer->external_product_id)) : null,
            trim((string) ($offer->referral_url ?: data_get($payload, 'referral_url', ''))) !== '' ? 'Apri offerta: ' . trim((string) ($offer->referral_url ?: data_get($payload, 'referral_url', ''))): null,
        ], static fn(?string $line): bool => is_string($line) && trim($line) !== ''));

        return implode(PHP_EOL, $lines);
    }

    private function resolveImageUrl(ProductOffer $offer): ?string
    {
        $payload  = is_array($offer->meta['payload'] ?? null) ? $offer->meta['payload'] : [];
        $imageUrl = trim((string) data_get($payload, 'image_url', ''));

        return $imageUrl !== '' && str_starts_with($imageUrl, 'http') ? $imageUrl : null;
    }

    private function formatMoney(mixed $amount, string $currency, string $label): ?string
    {
        if (! is_numeric($amount)) {
            return null;
        }

        return $label . ': ' . number_format((float) $amount, 2, ',', '.') . ' ' . strtoupper(trim($currency) !== '' ? $currency : 'EUR');
    }
}