<?php

declare(strict_types=1);

/**
 * Enrichissement via l'API RAWG (https://rawg.io/apidocs).
 * Si la clé API est absente ou l'API indisponible, renvoie une liste vide.
 */
final class EnrichissementService
{
    private const BASE_URL = "https://api.rawg.io/api";

    public function estDisponible(): bool
    {
        return Config::get("rawgApiKey", "") !== "";
    }

    public function rechercher(string $titre, int $limite = 8): array
    {
        $titre = trim($titre);

        if ($titre === "" || !$this->estDisponible())
        {
            return [];
        }

        $cacheCle = "recherche_" . md5(mb_strtolower($titre));
        $cache = $this->lireCache($cacheCle);

        if ($cache !== null)
        {
            return array_slice($cache, 0, $limite);
        }

        $reponse = $this->appeler("/games", [
            "search" => $titre,
            "page_size" => $limite
        ]);

        if ($reponse === null || !isset($reponse["results"]) || !is_array($reponse["results"]))
        {
            return [];
        }

        $resultats = [];

        foreach ($reponse["results"] as $jeu)
        {
            $resultats[] = $this->mapperResultatListe($jeu);
        }

        $this->ecrireCache($cacheCle, $resultats);

        return $resultats;
    }

    public function detail(int $rawgId): ?array
    {
        if (!$this->estDisponible())
        {
            return null;
        }

        $cacheCle = "detail_" . $rawgId;
        $cache = $this->lireCache($cacheCle);

        if ($cache !== null)
        {
            return $cache;
        }

        $reponse = $this->appeler("/games/" . $rawgId);

        if ($reponse === null)
        {
            return null;
        }

        $detail = $this->mapperDetail($reponse);
        $this->ecrireCache($cacheCle, $detail);

        return $detail;
    }

    public function telechargerJaquette(?string $urlImage): ?string
    {
        if ($urlImage === null || $urlImage === "")
        {
            return null;
        }

        $extension = pathinfo(parse_url($urlImage, PHP_URL_PATH) ?? "", PATHINFO_EXTENSION);
        $extension = $extension !== "" ? strtolower($extension) : "jpg";

        if (!in_array($extension, ["jpg", "jpeg", "png", "webp", "gif"], true))
        {
            $extension = "jpg";
        }

        $nomFichier = Helpers::genererId() . "." . $extension;
        $cheminLocal = Config::get("jaquettesPath") . "/" . $nomFichier;

        $contexte = stream_context_create([
            "http" => [
                "timeout" => 10,
                "header" => "User-Agent: JeuxVideoTech/1.0\r\n"
            ]
        ]);

        $contenu = @file_get_contents($urlImage, false, $contexte);

        if ($contenu === false)
        {
            return $urlImage;
        }

        if (file_put_contents($cheminLocal, $contenu) === false)
        {
            return $urlImage;
        }

        return $nomFichier;
    }

    private function mapperResultatListe(array $jeu): array
    {
        $genres = [];

        foreach ($jeu["genres"] ?? [] as $genre)
        {
            if (!empty($genre["name"]))
            {
                $genres[] = $genre["name"];
            }
        }

        return [
            "rawgId" => (int) ($jeu["id"] ?? 0),
            "titre" => (string) ($jeu["name"] ?? ""),
            "dateSortie" => $jeu["released"] ?? null,
            "jaquetteUrl" => $jeu["background_image"] ?? null,
            "genres" => $genres,
            "note" => $jeu["rating"] ?? null
        ];
    }

    private function mapperDetail(array $jeu): array
    {
        $base = $this->mapperResultatListe($jeu);

        $editeurs = [];
        foreach ($jeu["publishers"] ?? [] as $editeur)
        {
            if (!empty($editeur["name"]))
            {
                $editeurs[] = $editeur["name"];
            }
        }

        $developpeurs = [];
        foreach ($jeu["developers"] ?? [] as $developpeur)
        {
            if (!empty($developpeur["name"]))
            {
                $developpeurs[] = $developpeur["name"];
            }
        }

        $description = (string) ($jeu["description_raw"] ?? "");

        if ($description === "" && !empty($jeu["description"]))
        {
            $description = trim(strip_tags((string) $jeu["description"]));
        }

        return array_merge($base, [
            "description" => $description,
            "editeur" => implode(", ", $editeurs),
            "developpeur" => implode(", ", $developpeurs)
        ]);
    }

    private function appeler(string $chemin, array $params = []): ?array
    {
        $params["key"] = Config::get("rawgApiKey");
        $url = self::BASE_URL . $chemin . "?" . http_build_query($params);

        $contexte = stream_context_create([
            "http" => [
                "method" => "GET",
                "timeout" => 8,
                "header" => "User-Agent: JeuxVideoTech/1.0\r\nAccept: application/json\r\n"
            ]
        ]);

        $reponse = @file_get_contents($url, false, $contexte);

        if ($reponse === false)
        {
            return null;
        }

        $donnees = json_decode($reponse, true);

        return is_array($donnees) ? $donnees : null;
    }

    private function lireCache(string $cle): ?array
    {
        $fichier = Config::get("cachePath") . "/" . $cle . ".json";

        if (!is_file($fichier))
        {
            return null;
        }

        if (filemtime($fichier) < time() - 86400)
        {
            return null;
        }

        $contenu = file_get_contents($fichier);

        if ($contenu === false)
        {
            return null;
        }

        $donnees = json_decode($contenu, true);

        return is_array($donnees) ? $donnees : null;
    }

    private function ecrireCache(string $cle, array $donnees): void
    {
        $dossier = Config::get("cachePath");

        if (!is_dir($dossier))
        {
            mkdir($dossier, 0775, true);
        }

        $fichier = $dossier . "/" . $cle . ".json";
        file_put_contents(
            $fichier,
            json_encode($donnees, JSON_UNESCAPED_UNICODE | JSON_UNESCAPED_SLASHES),
            LOCK_EX
        );
    }
}