<?php

require __DIR__ . "/../vendor/autoload.php";

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

class WatchingImportHandler extends ApiHandler
{
  private string $tmdbApiKey;
  private string $tmdbImportToken;

  public function __construct()
  {
    parent::__construct();
    $this->ensureCliAccess();

    $this->tmdbApiKey = $_ENV["TMDB_API_KEY"] ?? getenv("TMDB_API_KEY");
    $this->tmdbImportToken = $_ENV["WATCHING_IMPORT_TOKEN"] ?? getenv("WATCHING_IMPORT_TOKEN");
  }

  public function handleRequest(): void
  {
    $input = json_decode(file_get_contents("php://input"), true);

    if (!$input) $this->sendErrorResponse("Invalid or missing JSON body", 400);

    $providedToken = $input["token"] ?? null;
    $tmdbId = $input["tmdb_id"] ?? null;
    $mediaType = $input["media_type"] ?? null;

    if ($providedToken !== $this->tmdbImportToken) {
      $this->sendErrorResponse("Unauthorized access", 401);
    }

    if (!$tmdbId || !$mediaType) {
      $this->sendErrorResponse("tmdb_id and media_type are required", 400);
    }

    try {
      $mediaData = $this->fetchTMDBData($tmdbId, $mediaType);
      $this->processMedia($mediaData, $mediaType);
      $this->sendResponse(["message" => "Media imported successfully"], 200);
    } catch (\Exception $e) {
      $this->sendErrorResponse("Error: " . $e->getMessage(), 500);
    }
  }

  private function fetchTMDBData(string $tmdbId, string $mediaType): array
  {
    $client = new Client();
    $url = "https://api.themoviedb.org/3/{$mediaType}/{$tmdbId}";

    $response = $client->get($url, [
      "query" => ["api_key" => $this->tmdbApiKey],
      "headers" => ["Accept" => "application/json"],
    ]);

    $data = json_decode($response->getBody(), true);
    if (empty($data)) throw new \Exception("No data found for TMDB ID: {$tmdbId}");

    return $data;
  }

  private function processMedia(array $mediaData, string $mediaType): void
  {
    $tagline = $mediaData["tagline"] ?? null;
    $overview = $mediaData["overview"] ?? null;
    $description = "";

    if (!empty($tagline)) $description .= "> " . trim($tagline) . "\n\n";
    if (!empty($overview)) $description .= trim($overview);

    $id = $mediaData["id"];
    $title = $mediaType === "movie" ? $mediaData["title"] : $mediaData["name"];
    $year = $mediaData["release_date"] ?? $mediaData["first_air_date"] ?? null;
    $year = $year ? substr($year, 0, 4) : null;
    $tags = array_map(
      fn($genre) => strtolower(trim($genre["name"])),
      $mediaData["genres"] ?? []
    );
    $slug = $mediaType === "movie"
      ? "/watching/movies/{$id}"
      : "/watching/shows/{$id}";
    $payload = [
      "title" => $title,
      "year" => $year,
      "description" => $description,
      "tmdb_id" => $id,
      "slug" => $slug,
    ];
    $table = $mediaType === "movie" ? "movies" : "shows";

    try {
      $response = $this->makeRequest("POST", $table, ["json" => $payload]);
    } catch (\Exception $e) {
      $response = $this->fetchFromApi($table, "tmdb_id=eq.{$id}")[0] ?? [];
    }

    if (!empty($response["id"])) {
      $mediaId = $response["id"];
      $existingTagMap = $this->getTagIds($tags);
      $updatedTagMap = $this->insertMissingTags($tags, $existingTagMap);
      $this->associateTagsWithMedia($mediaType, $mediaId, array_values($updatedTagMap));
    }
  }

  private function getTagIds(array $tags): array
  {
    $map = [];

    foreach ($tags as $tag) {
      $response = $this->fetchFromApi("tags", "name=ilike." . urlencode($tag));
      if (!empty($response[0]["id"])) {
        $map[strtolower($tag)] = $response[0]["id"];
      }
    }

    return $map;
  }

  private function insertMissingTags(array $tags, array $existingMap): array
  {
    $newTags = array_diff($tags, array_keys($existingMap));

    foreach ($newTags as $tag) {
      try {
        $created = $this->makeRequest("POST", "tags", ["json" => ["name" => $tag]]);
        if (!empty($created["id"])) $existingMap[$tag] = $created["id"];
      } catch (\Exception $e) {
        $fallback = $this->fetchFromApi("tags", "name=eq." . urlencode($tag));
        if (!empty($fallback[0]["id"])) $existingMap[$tag] = $fallback[0]["id"];
      }
    }

    return $existingMap;
  }

  private function associateTagsWithMedia(string $mediaType, int $mediaId, array $tagIds): void
  {
    $junction = $mediaType === "movie" ? "movies_tags" : "shows_tags";
    $mediaColumn = $mediaType === "movie" ? "movies_id" : "shows_id";

    foreach ($tagIds as $tagId) {
      $this->makeRequest("POST", $junction, ["json" => [
        $mediaColumn => $mediaId,
        "tags_id" => $tagId
      ]]);
    }
  }
}

$handler = new WatchingImportHandler();
$handler->handleRequest();