<?php

namespace App\Services;

use GuzzleHttp\Client;
use Illuminate\Support\Facades\Cache;
use Illuminate\Support\Facades\Log;

class IgdbService
{
    protected Client $client;
    protected string $clientId;
    protected string $clientSecret;
    protected string $baseUrl;

    public function __construct()
    {
        $this->client = new Client(['timeout' => 10]);
        $this->clientId = config('services.igdb.client_id');
        $this->clientSecret = config('services.igdb.client_secret');
        $this->baseUrl = config('services.igdb.base_url', 'https://api.igdb.com/v4');
    }

    /**
     * Get or refresh the OAuth access token (cached for 55 days).
     */
    protected function getAccessToken(): string
    {
        return Cache::remember('igdb_access_token', 60 * 60 * 24 * 55, function () {
            $response = $this->client->post('https://id.twitch.tv/oauth2/token', [
                'form_params' => [
                    'client_id'     => $this->clientId,
                    'client_secret' => $this->clientSecret,
                    'grant_type'    => 'client_credentials',
                ],
            ]);
            $data = json_decode($response->getBody(), true);
            return $data['access_token'];
        });
    }

    /**
     * Make an authenticated POST request to the IGDB API.
     */
    protected function query(string $endpoint, string $body): array
    {
        try {
            $response = $this->client->post("{$this->baseUrl}/{$endpoint}", [
                'headers' => [
                    'Client-ID'     => $this->clientId,
                    'Authorization' => 'Bearer ' . $this->getAccessToken(),
                    'Accept'        => 'application/json',
                ],
                'body' => $body,
            ]);
            return json_decode($response->getBody(), true) ?? [];
        } catch (\Exception $e) {
            Log::error("IGDB API error [{$endpoint}]: " . $e->getMessage());
            return [];
        }
    }

    /**
     * Search games by title.
     */
    public function searchGames(string $query, int $limit = 10): array
    {
        return $this->query('games', "
            search \"{$query}\";
            fields id,name,slug,summary,cover.image_id,first_release_date,
                   genres.name,genres.slug,platforms.name,platforms.abbreviation,
                   involved_companies.company.name,involved_companies.developer,
                   rating,rating_count;
            limit {$limit};
        ");
    }

    /**
     * Get a single game by IGDB ID with full details.
     */
    public function getGame(int $igdbId): ?array
    {
        $results = $this->query('games', "
            fields id,name,slug,summary,cover.image_id,first_release_date,
                   genres.id,genres.name,genres.slug,
                   platforms.id,platforms.name,platforms.slug,platforms.abbreviation,
                   involved_companies.company.id,involved_companies.company.name,
                   involved_companies.company.slug,involved_companies.developer,
                   involved_companies.publisher,
                   screenshots.image_id,
                   rating,rating_count;
            where id = {$igdbId};
            limit 1;
        ");
        return $results[0] ?? null;
    }

    /**
     * Get popular games (by rating and rating count).
     */
    public function getPopularGames(int $limit = 20, int $offset = 0): array
    {
        return $this->query('games', "
            fields id,name,slug,summary,cover.image_id,first_release_date,
                   genres.name,genres.slug,platforms.abbreviation,
                   rating,rating_count;
            where rating != null & rating_count > 100 & cover != null;
            sort rating_count desc;
            limit {$limit};
            offset {$offset};
        ");
    }

    /**
     * Get recently released games.
     */
    public function getNewReleases(int $limit = 10): array
    {
        $timestamp = now()->subMonths(3)->timestamp;
        $now = now()->timestamp;

        return $this->query('games', "
            fields id,name,slug,summary,cover.image_id,first_release_date,
                   genres.name,genres.slug,platforms.abbreviation,
                   rating,rating_count;
            where first_release_date >= {$timestamp} & first_release_date <= {$now} & cover != null;
            sort first_release_date desc;
            limit {$limit};
        ");
    }

    /**
     * Get games by genre.
     */
    public function getGamesByGenre(int $genreIgdbId, int $limit = 20, int $offset = 0): array
    {
        return $this->query('games', "
            fields id,name,slug,summary,cover.image_id,first_release_date,
                   genres.name,genres.slug,platforms.abbreviation,
                   rating,rating_count;
            where genres = [{$genreIgdbId}] & cover != null & rating != null;
            sort rating desc;
            limit {$limit};
            offset {$offset};
        ");
    }

    /**
     * Build a full cover image URL from an IGDB image_id.
     */
    public static function coverUrl(string $imageId, string $size = 'cover_big'): string
    {
        return "https://images.igdb.com/igdb/image/upload/t_{$size}/{$imageId}.jpg";
    }

    /**
     * Build a screenshot URL from an IGDB image_id.
     */
    public static function screenshotUrl(string $imageId, string $size = 'screenshot_med'): string
    {
        return "https://images.igdb.com/igdb/image/upload/t_{$size}/{$imageId}.jpg";
    }
}