<?php

require_once __DIR__.'/../bootstrap.php';

use App\Classes\ApiHandler;
use GuzzleHttp\Client;

class SeasonImportHandler extends ApiHandler
{
    private string $tmdbApiKey;

    private string $seasonsImportToken;

    public function __construct()
    {
        parent::__construct();

        $this->ensureCliAccess();
        $this->tmdbApiKey = getenv('TMDB_API_KEY') ?: $_ENV['TMDB_API_KEY'];
        $this->seasonsImportToken = getenv('SEASONS_IMPORT_TOKEN') ?: $_ENV['SEASONS_IMPORT_TOKEN'];
        $this->authenticateRequest();
    }

    private function authenticateRequest(): void
    {
        if ($_SERVER['REQUEST_METHOD'] !== 'POST') {
            $this->sendErrorResponse('Method Not Allowed', 405);
        }

        $authHeader = $_SERVER['HTTP_AUTHORIZATION'] ?? '';

        if (! preg_match('/Bearer\s+(.+)/', $authHeader, $matches)) {
            $this->sendErrorResponse('Unauthorized', 401);
        }

        $providedToken = trim($matches[1]);

        if ($providedToken !== $this->seasonsImportToken) {
            $this->sendErrorResponse('Forbidden', 403);
        }
    }

    public function importSeasons(): void
    {
        $ongoingShows = $this->fetchFromApi('optimized_shows', 'ongoing=eq.true');

        if (empty($ongoingShows)) {
            $this->sendResponse(['message' => 'No ongoing shows to update'], 200);
        }

        foreach ($ongoingShows as $show) {
            $this->processShowSeasons($show);
        }

        $this->sendResponse(['message' => 'Season import completed'], 200);
    }

    private function processShowSeasons(array $show): void
    {
        $tmdbId = $show['tmdb_id'] ?? null;
        $showId = $show['id'] ?? null;

        if (! $tmdbId || ! $showId) {
            return;
        }

        $tmdbShowData = $this->fetchShowDetails($tmdbId);
        $seasons = $tmdbShowData['seasons'] ?? [];
        $status = $tmdbShowData['status'] ?? 'Unknown';

        if (empty($seasons) && ! $this->shouldKeepOngoing($status)) {
            $this->disableOngoingStatus($showId);

            return;
        }

        foreach ($seasons as $season) {
            $this->processSeasonEpisodes($showId, $tmdbId, $season);
        }
    }

    private function shouldKeepOngoing(string $status): bool
    {
        return in_array($status, ['Returning Series', 'In Production']);
    }

    private function fetchShowDetails(string $tmdbId): array
    {
        $client = new Client();
        $url = "https://api.themoviedb.org/3/tv/{$tmdbId}?api_key={$this->tmdbApiKey}&append_to_response=seasons";

        try {
            $response = $client->get($url, ['headers' => ['Accept' => 'application/json']]);

            return json_decode($response->getBody(), true) ?? [];
        } catch (\Exception $e) {
            return [];
        }
    }

    private function fetchWatchedEpisodes(int $showId): array
    {
        $episodes = $this->fetchFromApi('optimized_last_watched_episodes', "show_id=eq.{$showId}&order=last_watched_at.desc&limit=1");

        if (empty($episodes)) {
            return [];
        }

        return [
            'season_number' => (int) $episodes[0]['season_number'],
            'episode_number' => (int) $episodes[0]['episode_number'],
        ];
    }

    private function processSeasonEpisodes(int $showId, string $tmdbId, array $season): void
    {
        $seasonNumber = $season['season_number'] ?? null;

        if ($seasonNumber === null || $seasonNumber == 0) {
            return;
        }

        $episodes = $this->fetchSeasonEpisodes($tmdbId, $seasonNumber);

        if (empty($episodes)) {
            return;
        }

        $watched = $this->fetchWatchedEpisodes($showId);
        $lastWatchedSeason = $watched['season_number'] ?? null;
        $lastWatchedEpisode = $watched['episode_number'] ?? null;

        $scheduled = $this->fetchFromApi(
            'optimized_scheduled_episodes',
            "show_id=eq.{$showId}&season_number=eq.{$seasonNumber}"
        );

        $scheduledEpisodeNumbers = array_column($scheduled, 'episode_number');

        foreach ($episodes as $episode) {
            $episodeNumber = $episode['episode_number'] ?? null;

            if ($episodeNumber === null) {
                continue;
            }
            if (in_array($episodeNumber, $scheduledEpisodeNumbers)) {
                continue;
            }
            if ($lastWatchedSeason !== null && $seasonNumber < $lastWatchedSeason) {
                return;
            }
            if ($seasonNumber == $lastWatchedSeason && $episodeNumber <= $lastWatchedEpisode) {
                continue;
            }

            $this->addEpisodeToSchedule($showId, $seasonNumber, $episode);
        }
    }

    private function fetchSeasonEpisodes(string $tmdbId, int $seasonNumber): array
    {
        $client = new Client();
        $url = "https://api.themoviedb.org/3/tv/{$tmdbId}/season/{$seasonNumber}?api_key={$this->tmdbApiKey}";

        try {
            $response = $client->get($url, ['headers' => ['Accept' => 'application/json']]);

            return json_decode($response->getBody(), true)['episodes'] ?? [];
        } catch (\Exception $e) {
            return [];
        }
    }

    private function addEpisodeToSchedule(int $showId, int $seasonNumber, array $episode): void
    {
        $airDate = $episode['air_date'] ?? null;

        if (! $airDate) {
            return;
        }

        $today = date('Y-m-d');
        $status = ($airDate < $today) ? 'aired' : 'upcoming';
        $payload = [
            'show_id' => $showId,
            'season_number' => $seasonNumber,
            'episode_number' => $episode['episode_number'],
            'air_date' => $airDate,
            'status' => $status,
        ];

        $this->makeRequest('POST', 'scheduled_episodes', ['json' => $payload]);
    }
}

$handler = new SeasonImportHandler();
$handler->importSeasons();