<?php

require __DIR__ . "/../vendor/autoload.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();